28 October 2018, Volume 37 Issue 22
    

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  • ZHOU Xia,LI Kai,CHEN Chenghang,CHEN Xingchi
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 1-9.
    Abstract ( 463 ) Download PDF ( 248 )   Knowledge map   Save
    In order to investigate the low-velocity impact response of novel fiber reinforced magnesium alloy laminates, the numerical simulations of low velocity drop weight impact tests on AZ31B magnesium alloy laminates reinforced with glass fiber, carbon fiber and their hybrids under different impact energies were conducted.The magnesium alloy, the interfacial delamination between two neighboring layers and the fiber/epoxy composites in the fiber/AZ31B Mg laminates were modeled by using an anisotropic plastic constitutive model, an exponential cohesive zone model, and 3D Hashin failure criteria incorporated with the stiffness reduction of failed elements respectively.In addition, the numerical analyses on the low-velocity impact of different fiber/Mg laminates were carried out by using ABAQUS/Explicit with a user-defined subroutine VUMAT to predict the dynamic impact response, delamination as well as damage evolution under different impact energies.Meantime, the variations of impact force, deformation and energy absorption with time were also analyzed.The results show that the matrix cracking first occurs at the backside, while the matrix cracking and fiber breakage could also appear at the impact side with the increasing of impact energy.Compared with a single carbon fiber reinforced epoxy composite/magnesium alloy laminate, a single glass fiber reinforced epoxy composite/magnesium alloy/laminate can absorb more energy under impact load.Hybrid carbon fiber and glass fiber composite laminates can provide the best impact-resistant properties when the glass layers are at the down layer.
  • CHAI Kai1,2,LOU Jingjun2,ZHU Shijian2,YU Xiang2,WU Haiping2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 10-16.
    Abstract ( 278 ) Download PDF ( 127 )   Knowledge map   Save
    A migration control strategy for a nonlinear vibration isolation system with multiple coexistent attractors was investigated.First, a global bifurcation analysis was carried out and the multiple coexistent attractors were obtained.Then, several control methods were adopted to accomplish the migration of different attractors.The umerical simulations show that the open-plus-nonlinear-closed-loop (OPNCL) control has the global controlling basin property, compared with the open loop, linear feedback and open-plus-closed-loop (OPCL) controls.The results providea novel approach for the line spectrum reduction in the low frequency band of submarine radiated underwater noises.
  • LU Yingxia,WANG Rubin
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 17-21.
    Abstract ( 288 ) Download PDF ( )   Knowledge map   Save
    The sparse coding model for natural scene can explain some physiological properties of neurons in V1, but it is still unknown whether this coding model could be learned according to the biologically local synaptic plasticity rule.Due to the existence of the lateral inhibition phenomenon in the biological neural network, a neural network dynamic model was established based on this phenomenon and using the local synaptic plasticity.The simulation of the receptive field of V1 cells was carried out.At the same time, the reconstructed residuals were discussed by using the sparse reconstruction coefficients obtained by the model.The results show that the susceptibility field of V1 cells can be obtained by using the sparse coding, and the rationality of the kinetic model can be described by the input of natural images.
  • WANG Yilong1,CAO Dengqing1,YANG Yang2,ZHANG Liwei3
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 22-29.
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    By virtue of the principle of dynamic absorbers and traditional damping rings, a new type of damping ring was proposed to suppress the vibration of a rotor-gear transmission system.Based on an experimental device for an aero-engine, the bending-torsion coupling dynamic model of the rotor-gear transmission system was established by using the lumped parameter method (LPM).The Runge-Kutta method was employed to work out the simulation results, and the dynamic response of the system was also analyzed in the working frequency range.On this basis, the influences of the damping ring’s installation stiffness, installation damping and friction on the dynamic response of the system were then investigated respectively.The simulation results reveal that the new type damping ring has a significant effect on the bending-torsion coupling vibration of the rotor-gear transmission system in the high frequency range, compared to the traditional damping rings.In a certain range, it is helpful to suppress the bending vibration of the rotors and the torsional vibration of the gears in the high frequency range by increasing the structural parameters of the damping ring.The optimal design of the new type damping ring is important for the vibration suppression of the rotor-gear transmission system.

  • GUO Fang, FANG Zongde, ZHANG Xijin
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 30-35.
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    An algorithm for studying the gear meshing-in impact considering the measured pitch error was proposed to analyse the effect of manufacturing errors on the meshing-in impact.Based on the tooth contact analysis (TCA) and loaded tooth contact analysis (LTCA) considering the measured pitch error, by the algorithm the actual position of the meshing-in contactin gear meshing was calculated precisely.Next, according to the LTCA-calculated tooth deformation and load sharing factor between teeth, the teeth stiffness at the meshing-in point of the current mating teeth was obtained.Then, the meshing-in impact in a big cycle of n meshing periods (n is the least common multiple of the teeth number of pinion and gear) was analyzed.The study shows that, in the situation of random relative pitch error, by the algorithm the position of the corner contact in gear meshing-in and the corresponding stiffness can be acquired exactly.The algorithm is suitable for the modified tooth surfaces or error surfaces of gear systems.The result really reflect the effect of measured pitch error on the meshing-in impact.
     
  • QIN Meijuan1,JIN Xiaoling1,CHEN Michael Z.Q.2,HUANG Zhilong1
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 36-42.
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    A shaft structure using a centrifugal pendulum absorber with inerters was studied.Based on the supposition of low-amplitude vibration, an axial dynamic equation of the shaft structure was established.Then the frequency response functions of the axial vibration of the shaft structure and the rotational vibration of the centrifugal pendulum were obtained.The influences of absorber parameters, such as the non-dimensional damping, mass ratio, and tuning function, on the axial vibration of the shaft structure were emphatically investigated.The optimization of absorber parameters for minimizing the resonant amplitude of axial vibration of the shaft structure was carried out.By using the fixed-point theory, the optimal non-dimensional damping was analytically expressed.The results indicate the tuning function has a significant effect on the axial vibration, and the maximum vibration reduction can also be achieved with a proper tuning function.Moreover, with the application of torsional inerters in the absorber, the tuning function can be easily adjusted.Finally, the axial vibration absorption effect of the centrifugal pendulum absorber with inerters was compared with that of a dynamic vibration absorber, and it is illustrated that the vibration reduction effect of the optimized centrifugal pendulum absorber with inerters is much better.

     
  • JIANG Wan-lu1,2, LEI Ya-fei1,2, HAN Ke1,2,3, ZHANG Sheng1,2, SU Xiao1,2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 43-50.
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    A performance degradation degree quantitative assessment method for rolling bearings was proposed, which integrates the methods of Variational Mode Decomposition(VMD) and Support Vector Data Description (SVDD).Aiming at solving the problem that some parts of a signal may be disturbed by abnormal signals if the sampling time is long and the collected signal contains too many data points.A new feature extraction method based on VMD and SVDD was proposed, in which the long signal was segmented into several short frame signals, and the short signals were decomposed by VMD to obtain several components.The singular value of each component was extracted respectively to form a feature vector, and then a set of feature vectors was obtained.After finding and removing outliers by SVDD, the average value of the remained feature vectors was used as the feature of the original signal.Following the feature extraction, SVDD was used to assess the performance degradation.The degree of performance degradation was described by the distance from the test sample to the center of the hypersphere model, and the membership function was used to transform the distance index into the membership degree to the normal state and taken as the performance degradation index, which quantitatively assesses the performance degradation degree.The proposed method was tested with the complete life data of a rolling bearing, and the result was compared with the analysis result by the traditional time-domain index feature extraction method.The superiority of the proposed method was verified.
  • WU Chunzhi,JIANG Pengcheng, FENG fuzhou,CHEN Tang,CHEN Xianglong
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 51-56.
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    Traditional diagnosis methods need to extract features manually and classify faults by pattern recognition methods.It’s difficult to solve the problem of end-to-end fault diagnosis.Therefore, a one-dimensional convolution neural network (1-DCNN) model suitable for analyzing vibration data was established.The model can learn features directly from raw vibration data and complete fault diagnosis in succession.Three traditional models and the 1-DCNN model were tested with the compound fault data collected from PHM 2009 Challenge Data and a tank gearbox.The results show that the precision of the 1-DCNN model for single and complex fault diagnosis is higher than that of traditional diagnostic methods.

  • MA Xiaojun,LENG Yonggang,LIU Jinjun,FAN Shengbo
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 57-66.
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    In order to harvest vibration energy in any direction, a three-dimensional energy harvester was proposed.Its monostable or bistable oscillation characteristics of each cantilever increase the efficiency of energy harvesting.The system dynamic modeling and the nonlinear magnet force in analysis were implemented.The simulation results were compared with experimental results, and the optimization of the structure was carried out.It is shown that in a certain bandwidth and intensity range of random excitation, in the system exists at least one magnet gap which leads to the peak values of output voltages in two axes directions, meanwhile ensures a high-level second optimum in the third axis direction.By adjusting this optimal distance, the energy harvesting can be kept in a high-efficiency state without structural adjustments in real vibrational environment.
  • ZHI Hongying1, YAN Xianguo2,DU Juan2,CAO Qichao2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 67-74.
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    To address the vibration phenomenon in milling process, the Hamming linear multistep method (HAMM) was proposed to predict the stability of milling process.The dynamic equation for milling process with regenerative chatter was expressed as a delay linear differential equation .The cutter tooth cycle was divided into forced and free vibration stages.The forced vibration stage was discretized and the HAMM was used to construct a state transition matrix.The stability of the system was determined based on the Floquet theory, and the corresponding stability lobe diagrams were obtained.The matlab simulation results show that the HAMM is an effective method to predict the stability of milling.With the increase of discretization number, the convergence rate of HAMMis faster than that of the first-order semi-discretization method(1st-SDM) and second-order full-discretization method(2nd-FDM).The HAMM with less discretization number can already reach the local discrete error of 1st-SDM and 2nd-FDM with more discretization numbers.In addition, for one and two degree-freedom dynamic models, the stability lobes diagrams by the three methods show that the prediction accuracy of the HAMM is better than that of the 1st-SDM and 2nd-FDM, and the computation efficiency of the HAMM is much higher than that of the 1st-SDM and 2nd-FDM.The experimental results also show that the HAAM method is effective for predicting the milling stability.
  • YANG Liu1,LI Qiang1,YANG Shaopu2,WANG Jiujian2,GU Xiaohui2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 75-80.
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    With the continual improvement of locomotive speed, higher requirements on the stability and operating safety of locomotives have arisen.The rotor dynamic model of a transmission system, was stuclied, taking into account the composite factors fault feature such as the bear and gear mesh stiffnesses.First, the rotor dynamic model of the transmission system was built,taking into account the factors such as the rotor, gear mesh stiffness and bearing support stiffness.Next, according to the types of locomotive components’ fault features, the local fault feature expressions for the gear and bearing were derived.Then, the amplitude and frequency characteristics were verified numerically, and the transmission characteristics of the signal energy and correlation of the system were explained when there were local fault defect in the system.
  • RONG Feng1,2,CHEN Ning1,2,GUO Cuijuan1,2,YANG Mingzhu1,2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 81-87.
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    The HHT and traditional time-frequency analysis methods have usually the disadvantages of mode mixing, low time-frequency concentration and so on, which makes the speed curve estimation error larger.So a new method for estimating the speed curve was proposed by using the EEMD-HHT combined with a time-frequency reassignment algorithm.First, the EEMD method was used to obtain IMFs.The IMF corresponding to the referentiral axis was Looked for, on which the Hilbert transform was carried out.Next, the time-frequency reassignment transformation method was used to process the data at each end of this IMF.The ridge of the reassignment matrix was searched with some limiting conditions, and the obtained instantaneous frequencies at both ends were used to replace those values obtained by the Hilbert transform.Then, the combined instantaneous frequencies were fitted to obtain a smooth speed curve.The method was applied to the order analysis of actual rotor unbalance faults.The validity and superiority of the proposed method were verified by comparing its results with the HHT estimation results.
  • LI Jingyan, GAO Wenxue, SONG Xiaolong
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 88-91.
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    Considering that an irregular ubiquitiformal fracture surface is resulted from the heterogeneity of rock material, a numerical simulation on the extension of a ubiquitiformal crack in rock material was carried out by using the ABAQUS software, together with the Weibull distribution characterization of the heterogeneity of material properties.The ubiquitiformal crack extension of rock material under dynamic tensile loading was analysed and the complexity of the fractured profile was calculated by using the box counting dimension.The numerical results were in good agreement with previous experimental data.The results of the crack extension path and the complexity of the fracture surface under different strain rate show that the complexity decreases with the increase of strain rate.Furthermore, from the analysis of ubiquitiformal fracture energy, it is found that the energy release rate increases with the increase of strain rate.Under lower strain rate,the crack propagates in the direction of minimum energy dissipation, while, with the increase of strain rate, the crack penetrates through the higher fracture energy element and propagates along the self-similar extension direction.These results imply that the strain rate effect on the extension of the ubiquitiformal crack can be induced by the heterogeneity of rock material, which could help to understand the mechanism of ubiquitiformal fracture.
  • PAN Zhaodong1,TAN Ping2,ZHOU Fulin2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 92-97.
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    A new multi objective optimization design method was proposed for decentralized control systems based on the structural controllability index, the particle swarm-differential evolution multi-objective hybrid swarm optimization (MOHO) algorithm and the structure stochastic response solutions of the decentralized control system.The subsystem division, parameters of controller, number and allocation of actuators were optimized.The optimal installation floors of control devices were determined through the structural controllability index.The number of actuators and controller gain for each subsystem were optimized through the multi-objective hybrid swarm optimization algorithm.Two indexes that reflect the structural vibration control effect and control strategy performance were used as the optimization objective function for each subsystem.A 12 story frame structure was used as a numerical example to validate the effectiveness of the proposed optimization design method.Various decentralized control schemes have been optimized, using the method and have been verified through the time-history analysis.The results show that the optimization method is stable and effective, and the optimal decentralized control system is more efficient than the centralized control system.
  • ZHAO Chunhua,DENG Lei,TANG Baoping,XIAO Xin
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 98-103.
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    Aiming at the problems in the carrier sense multiple access with collision avoidance (CSMA-CA) in IEEE 802.15.4 under the mass raw data transmission requirement in mechanical vibration wireless sensor networks(WSNs), such as the multiple carrier sense caused high listening energy consumption and hidden node caused high retransmission energy consumption, a transmission-sleep timing scheduling method was proposed based on the beacon synchronous trigger for machine vibration wireless sensor networks.The feature of whole network periodic synchronization in beacon-enabled networks was utilized to provide the basic time synchronization condition for distributed nodes, and to design a super frame structure, ensuring the time consistency of each node for receiving the scheduling information.Using the network short address at each node as the scheduling information and utilizing the ability of carrying payload of beacons to broadcast the scheduling information with beacons, the low consumption overhead scheduling information notification mechanism was realized.Finally, at each node the decision of whether transmitting data or sleeping was made according to the scheduling information to improve and optimize unnecessary high transmission energy consumption defects for the CSMA-CA during transmitting large amounts of raw data.Comparative experiments on the CSMA-CA were carried out and the experiment results indicate that the data transmission energy consumption of the machine vibration wireless sensor networks can be reduced effectively by the method.
  • WANG Xiuzhen,QIAN Yongjiu
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 104-110.
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    The nonlinear time history analyses of reinforced concrete frame structures under 128 seismic waves were carried out by using the OpenSees software.The effects of the steel yield strength, elastic modulus, steel structure quality, damping ratio, compressive strength of concrete,concrete elasticity modulus and intensity of ground motions were considered.Besides the above random variables, the influences of the yield strength and elastic modulus of the section steel were also considered.4 kinds of seismic demands for 2 kinds of frame structures were obtained respectively, namely, the top displacement, base shear, maximum floor acceleration and maximum interlayer displacement angle.The sensitivity ranking of each random variable was achieved, making use of two analysis methods, the local sensitivity analysis and global sensitivity analysis for the reinforced concrete frame structures.The results by the two methods were compared, and the random variables of significant influence and the random variables of smaller influence were found by both of the methods.The calculation and analysis results may be helpful for improving the calculation efficiency of the sensitivity analysis of seismic demands, in frame structure design.
  • Guo Beibei1,Wang Jun1,2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 111-114.
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    Aimsing at analyzing the accuracy of approximate analytical solutions for dropping shock responses of a tangent nonlinear packaging system without damping, dropping shock dynamic equations were established and the first-order approximate solutions were obtained by applying the homotopy perturbation method which is often adopted to solve general nonlinear vibration problems.The results were further modified by the energy method usually used in the packaging engineering.The corrected maximum displacement responses, the maximum acceleration responses and the system response periods are very close to the Runge-Kutta numerical solutions.The relative error is less than 1%.The research provides an effective and scientific method for the analysis of dropping shock responses of nonlinear packaging systems.
  • YUAN Jianping1,FAN Meng1,Giovanni Pace2,LU Rong1,LI Yanjun1,FU Yanxia3
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 115-121.
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    An axial-flow pump with the high specific speed of 1 500 r/min was chosen to investigate the effect of the matching between its impeller and diffuser on its hydraulic performances.An optimization method of orthogonal experiment was applied based on selecting seven kinds of geometric parameters of the corresponding impeller and diffuser as the optimized variables.In order to broaden the high-efficiency region of the axial-flow pump, the weighted average efficiency at the flow rates of 80%, 100% and 120% of the design flow rate was set as the goal, and 18 kinds of design schemes were finally obtained based on the L18(37) orthogonal test.Meanwhile, the numerical simulation of the steady inner flow in the axial flow pump were carried out to predict the hydraulic performances of the pump and the comparison among the 18 kinds of design schemes was conducted by using the SST k-ω turbulence model in ANSYS CFX14.5.The primary and secondary order of the geometric parameters that affect the aimed efficiency were studied through the range analysis, and an optimal parameter combination were obtained.The results show that: the weighted average efficiency of the axial-flow pump after optimization increases by 4.68%.Furthermore, the hydraulic efficiency of the optimized axial-flow pump is improved significantly at large flow rates with the value of the pump head basically unchanged.It is shown that the matching between the impeller and diffuser, like a pair of rotor and stator, has a significant effect on the hydraulic performances of axial-flow pumps.
  • ZHANG Longfei1, TAO Zhong2, PAN Wen1, ZHANG Zhanshu3, LAN Xiang1, ZENG Chuanwang4
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 122-127.
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    In view of the shortcomings of traditional isolation rubber bearings in tensile performance, a rail-type anti-tensile device(RTD) was designed to provide rubber bearings with additional tensile stiffness, and a new kind of tensile rubber bearings was proposed which can be used in high-rise buildings with large aspect ratio.By pseudo-static tests, the horizontal compression-shear and vertical tensile behaviors of the natural rubber bearing LNR600 and the rail-type rubber bearing RTD&LNR600 were studied.Based on the ABAQUS analysis platform, the vertical tensile constitutive relation of the RTD and the horizontal mechanical properties of the RTD&LNR600 were studied in the states of compression-shear and tension-shear.The results show that: in compression-shear state, the equivalent horizontal stiffness of RTD&LNR600 is slightly greater than that of LNR600,but not more than 4%.The vertical tensile constitutive relation of RTD&LNR600 is bilinear,and the tensile bearing capacity is greatly improved.The tensile properties of RTD are not affected by the eccentric state.It is shown the mechanical behaviors of RTD can be described by the bilinear model.The horizontal performance of RTD&LNR600 is stable in tension-shear state, and its correlation with tension is not obvious.
  • LI Zongjing1,2,SHU Ganping1,2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 128-135.
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    Due to the parameter redundancy in the traditional Bouc-Wen model, a normalized form of the Bouc-Wen model was introduced.Then the relations between the parameters of the normalized Bouc-Wen model and the hysteretic parameters of the corresponding metallic damper were studied.A parameter sensitivity analysis was also conducted for the normalized Bouc-Wen model by using the local sensitivity analysis method based on two different sensitivity indices.A parameter fitting method was also proposed using a modified simulated annealing algorithm and verified by experiments.The results show that the initial elastic stiffness kd and the yield force Fdy are determined by the parameters kx, kw and ρ in the normalized Bouc-Wen model, the post-yield stiffness k′d is determined by the parameter kx, the yield displacement udy is determined by the parameter ρ, the relation between the shift stiffness ks and the initial elastic stiffness kd is determined by the parameter σ, and the smoothness of the transition from elastic to plastic response is determined by the parameter n.The parameters kw and ρ exhibit higher sensitivity, while σ, kx and n exhibit lower sensitivity.The modified simulated annealing algorithm is able to identify the parameters of the normalized Bouc-Wen model effectively, and the simulation hysteresis curves fit well with those by experiments.
  • QIAO Huiyun,YANG Yinghua,ZHONG Weihui
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 136-143.
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    Multi-story frame structures are often simplified as single-story substructures to study their progressive collapse resistance, in which a single-story substructure is studied and its behavior is applied to multi-story frame analysis.However, due to ignoring the effect of the vierendeel mechanism, the current simplified model could not fully reflect the mechanical behaviors of the whole structure.Based on a double-span beam model, the collapse mechanism of the single-story substructure was studied, and a resistance calculation method for the beam mechanism and catenary mechanism was proposed, which was then validated by numerical examples.To analyze the effect of the vierendeel mechanism on the overall behavior of multi-story frames, a top-floor substructure model was established, and the contribution index of the vierendeel mechanism against the progressive collapse was introduced.Incorporating with the above models, the process of demolishing four columns of the Ohio Union building was simulated.The results show that the simplified models are reasonable.The top and bottom stories of the multi-story frame show different anti-collapse mechanism, and the vierendeel mechanism together with other mechanisms resist the unbalanced load.At the same time, it is found that the Ohio Union building has good resistance to progressive collapse.
  • LIU Rong,SUN Wei
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 144-150.
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    Finding the best coating location of hard coating with a fixed shape is an urgent need for the engineering application of hard-coating dampings.A thin plate partially covered with hard coating was chosen to study the damping optimization of the coatings.The corresponding finite element model was derived for its free vibration analysis, and the modal loss factors of the coating structure were determined by the modified modal strain energy method.A damping optimization model for the hard-coating thin plate was created, taking the maximum modal loss factor of single order or multi orders as the objective function and the coating position as the design variable.Moreover, a method named multiple population genetic algorithm was proposed to solve the optimization problem.Finally, a cantilever titanium plate with a single side partially deposited with NiCrAlCoY+YSZ hard coating was taken as an example to carry out a case study.Based on the developed optimization model and method, the optimization of coating location was carried out and the rationality of the damping optimization results for the hard-coating plate was verified by experiments.
  • CHENG Baoan1,2,PANG Xinyu1,2,YANG Zhaojian1,2,SHAO Jie1,2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 151-157.
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    Aiming at the problem that the vibration signals of planetary gear boes are susceptible to noise interference, signal components complication and sun wheel troubles, a fault diagnosis method for the planetary gearbox sun gears based on the Neighborhood Coefficient (NeighCoeff) and Hilbert envelope was proposed.A vibration signal simulation model for sun gear local faults under noise disturbance was established.The NeighCoeff was used to denoise the noisy signal, and the signal was reconstructed by the Hilbert envelope.The simulation results provide a clearer spectrum, which proves that the method can effectively extract the fault characteristic frequency affected by noise.The method was applied to the fault diagnosis experiments of a practical planetary gearbox sun gear.The vibration signals of the sun gear processed by the method can classify clearly the three common working states: normal, broken teeth and wear and the faults of the sun gear can be accurately identified.The results show that the method can effectively improve the accuracy of fault diagnosis of sun gears.
  • HUANG Minshui,QIAN Chaoyue,CHENG Shaoxi,LU Hailin
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 158-163.
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    There are many disadvantages when cuckoo search (CS) is adopted in engineering optimization, mainly the low convergence accuracy and slow convergence.So, the CS was improved in the aspects of discovery probability and steplength, which was then used in damage identification.In the improved cuckoo search (ICS) the adaptive discovery probability and adaptive step length were adopted.A 3D finite element model of the ASCE Benchmark frame model in the University of British Columbia was setup with the help of the Matlab and the experimental frequencies and vibration modes in six damage cases were extracted from the laboratory data.In the end, a damage identification objective function was established making use of the frequency factor and mode shape factor, and the damage identification was carried out based on CS and ICS.It is shown that the damage location and damage degree of the structure can be identified with better accuracy based on ICS.The results are of great theoretical significance and engineering value, and it can be applied in the damage identification and health monitoring in practical engineering.

  • WEN Jiangtao 1 SUN Jiedi 2, YU Yang1 YAN Changhong1
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 164-172.
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    Machinery condition monitoring systems using industrial wireless sensor networks need complicated data compression and high-precisionreconstruction,however, thereare some limitations in the node resources of wireless sensor networks.A compressed sensing reconstruction method for rotating machinery vibration signals was proposed based on the wavelet packet dictionary optimization.Combining the multiresolution analysis with the K-SVD dictionary training, the wavelet packet dictionary optimization was introduced to replace the traditional sparse transformation method based on the orthogonal basis dictionary for improving the signal sparseness.According to the rotating machinery vibration signal characteristics, a block sparse Bayesian learning framework was put forward in which the expectation-maximization method was applied instead of the common reconstruction algorithms only based on the sparsity assumption.The experimentalresults show the proposed method has better reconstruction performance than traditional methods.

  • LI Xiaoli1,SUN Zhiguo2,LIU Xin1,WANG Dongsheng1,3
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 173-180.
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    In order to improve the lateral seismic performance of bridges with double column bents in mountain areas, a new seismic retrofitting method for the bents was proposed by using buckling-restrained braces (BRB) as a  seismic dissipation damper and the seismic behaviors of the bents were analyzed.Considering the regularity of the bents and layout of the BRB, a seismic analysis model for the bents in lateral direction retrofitted with BRB was built by using the software SAP2000.The internal forces and deformations of the bents were obtained by the linear response spectrum analysis under small earthquakes and the nonlinear time history analysis under strong earthquakes.The incremental dynamic analysis on the double column bridge bents retrofitted with BRB was conducted, and the responses of the bents were further verified by introducing two comparable parameters, the seismic response reduction ratio and residual drift ratio.The results show that the BRB can reduce internal forces of the bents effectively, while the shear strength demand of the bent base would be increased.The BRB could also reduce the maximum plastic deformation and residual drift ratio of the bents effectively.
  • ZHANG Zheng1,CUI Weicheng2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 181-186.
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    The local characteristic-scale decomposition is an effective adaptive decomposition method, which has been widely applied in the diagnosis of rotating mechanical faults, such as bearing and gear faults.In order to improve the decomposition quality, an end-effect suppression method was given based on the mixed interpolation and polynomial correction.First, the data segment of the endpoint neighborhood was linearly interpolated by means of mean point data.Next, the mean curve of the endpoint neighborhood was combined with the middle data segment, and the mean curve was formed according to the third order spline interpolation.Then, the mean curve of the endpoint neighborhood was corrected by the cubic polynomial method, and the smoothness of the resulting component was guaranteed.The analysis results of the simulated data and real bearing fault data show that the method can restrain the end-effect of local characteristic-scale decomposition effectively.
  • CHEN Shuli1,2,LIU Yongqian1,2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 187-193.
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    Flood scouring can lead to the destruction of the soil around pier foundation, and reduce the carrying capacity and dynamic performances, in serious cases, resulting in the collapse of bridges.The flood scouring on piers directly affects the safety of the railway operation, and is one of the main factors that cause damage to the bridge piers.Taking a heavy load railway as the engineering background, aiming at the shallow foundation pile bridge under the flood scouring, dynamic performance test and reinforcement technology research were carried out.The results show that flood scouring would bring the pile foundation to different degrees of exposure, which leads to the increase of the bridge and main beam dynamic responses.With the increase of the depth of scouring, the lateral vibration amplitudes of the pier and bridge gradually increase, and the lateral vibration frequency of the pier gradually decreases.The vibration of the pier directly intensifies the bridge vibration, with the dynamic performance parameters proportional to the basic scouring depth and the train speed.Against the scouring disaster, a method named “pile foundation supplement + base enlargement” method was put for ward for the sake of improving the base stability and the overall reinforcement.Dynamic performance tests were carried out before and after the reinforcement, the transverse vibration amplitudes of the pier and bridge are obviously reduced and the reinforcement effect is remarkable.
  • MOU Haolei,ZHANG Xuehan,SONG Dongfang,FENG Zhenyu,XIE Jiang
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 194-200.
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    For the fiber-reinforced composite laminates, tensile and compressive tests were carried out on the  composite unidirectional laminates of [90]16 and [0]16, and shear tests were conducted on the composite laminates of [±45]4s.The fracture surface morphology of specimens was observed by scanning electron microscope (SEM), and the failure modes and mesoscopic failure mechanism of specimens were analyzed.For fiber-reinforced composite laminated thin-walled structures, the quasi-static axial crushing tests were also conducted on the circular tubes of [±45/0/0/90/0]s and[0/90]3s, and square tubes of [0/90]3s and [±45]3s, and the macro damage modes and energy-absorbing characteristics were further investigated.The results show that macro damage modes are the collective result of variety of mesoscopic failure mechanisms, such as fiber fracture, matrix deformation and cracking, interlayer and layer cracks propagation, and so on.The circular tube of [±45/0/0/90/0]s has the transverse shearing failure mode with the largest SEA, The circular tube of [0/90]3s has the layer beam bending failure mode with the second largest specific energy absorption (SEA).The square tube of [0/90]3s has the layer beam bending failure mode with the third largest SEA.The square tube of [±45]3s has the local buckling failure mode with the least SEA.The failure modes of composite laminated thin-walled circular tubes and square tubes with different layup sequencing are significantly different, and the values of SEA are also quite different.The failure modes of composite laminated thin-wall structures can be altered by reasonable design, and the energy-absorbing characteristics might further be improved.
  • GENG Xiaofeng1,2,WEI Kexiang1,2,WANG Qiong1,2,YANG Bowen1,L Qing1
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 201-205.
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    The multi-frequency harmonic excitation is a nondestructive testing method, which detects crack damage by using the nonlinear modulation effects between low frequency vibration signals and high frequency ultrasonic wave signals.The nonlinear dynamic response characteristics of a 1 kW cracked wind turbine blade with different length and location of crack were investigated by the multi frequency excitation modulation experiments.The results show that, there are obvious nonlinear modulation phenomena in the cracked wind turbine blade, and with the increase of the crack length and the distance away from the root, the nonlinear modulation is obviously enhanced.The feasibility of the proposed method used to detect the early crack damage of wind turbine blades was verified by experiments.
  • CHENG Li1,2,LIANG Tao1,GUO Li3,CHENG Ming1,4,ZENG Lin1
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 206-213.
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    Singular value decomposition (SVD) can linearly decompose a signal into a series of components.In this paper, the basic principles and problems of singular value decomposition (SVD) based on Hankel matrix were analyzed, and three basic properties of SVD were revealed, which are linear decomposition, frequency domain disorder of reconstructed components and band-pass filtering.Based on this, a resonance enhanced singular value decomposition (SVD) method was proposed.The numerical simulation results show that the proposed method not only solves the frequency-domain disorder problem of the traditional singular value decomposition (SVD) well, but also can realize the linear bandpass filtering with a given bandwidth near any given frequency.The amplitude, frequency and phase features of the original signal are extracted completely.This is the advantage the existing signal processing methods do not have.The proposed method was successfully applied to the characteristic frequency extraction of a turboprop engine vibration monitoring.The results show that the proposed method has excellent feature extraction effect.
  • ZHANG Jinqiu1, PENG Hu2, ZHANG Jian1, PENG Zhizhao1, SUN Yiquan1, WANG Hui3
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 214-219.
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    Aiming at the difficulty in determining the values of weight matrices Q and R in a LQR active control algorithm, two weight parameters λ and ξ for the weight matrices Q and R of LQR were designed respectively.An optimal objective function f, was built and the influences of λ and ξ on the f were analysed.The fast searching ability of the Genetic Algorithm(GA), was utilized to obtain the optimization solution of the objective function through the dimension reduction optimization.The analysis results show that the vibration control performance of GA-LQR on the ride comfort and manipulation stability are more superior than the traditional LQR, and the value of the objective function is smaller.The proposed optimization method is simple and effective, and it is suitable for the application in the area of automobile engineering.
     
  • ZHAO Jianxue1, YU Xiang2, CHAI Kai1, YANG Qingchao2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 220-224.
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    The dynamic model for a vibration isolation system with quasi zero stiffness was established.The phenomenon of attractor coexistence was studied by drawing a bifurcation diagram, and the corresponding attraction domains were also analysed.A target orbit was established between the coexisting attractors, and the open loop control, closed loop control, open plus closed loop control were adopted to migrate the system to the target orbit respectively, in order to achieve the attractor migration control.The stability and feasibility of the open plus closed loop control method was investigated.The simulation results show that: the system has two stable periodic 1 attractors with different amplitudes.The open loop control method and closed loop control method are difficult to migrate the system to the target orbit, while the open plus closed loop control can make the system migrate between the attractions of two periodic 1 attractors along the target orbit, so, the system can be migrated to the periodic 1 attractor with small amplitude when it operates on the periodic 1 attractor with large amplitude, and thus achieves the vibration and noise reduction.The method provides a new way to improve the vibration isolation effect of nonlinear vibration isolation systems.
  • XU Zifei, YE Kehua, LI Chun, DING Qinwei, YANG Yang
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 225-230.
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    The support structure stability is the fundamental guarantee for the operation safety of offshore wind turbines.A NREL 5 MW wind turbine was selected as the baseline turbine and the ice loads were estimated by using the Ralston theory and considering the turbulent wind.The dynamic behaviors of the wind turbine tower installed with a cone structure of different cone angle were inspected and compared with those of the baseline turbine.The results show that the cone structure has significant effect on the reducing of ice loads, tower top acceleration and displacement.The average ice load and tower top acceleration in the case of 40° cone angle will be respectively reduced by 83.8% and 43.1% when the cone angle changes to 70°.Comparing with the baseline turbine, the tower-top displacements at the first order natural frequencies of the tower and the wind wheel in the case of 40° cone angle are reduced by 45% and 80% respectively.
  • OU Yihong1, LI Run1, YUAN Guangqiang2, LI Guoqing1,WANG Shimao1
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 231-237.
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    A numerical simulation was carried out to investigate the characteristics of gasoline-air mixture explosion in a 1 000 m3 vertical vault storage tank.Model experiments on a 625 L simulation tank were also performed for verification.The variations of the flow field and overpressures at different measuring points were analyzed under the conditions of fluid-structure coupling and uncoupling respectively, and the tank structure responses were studied under the coupling condition.The results show that: ① the variations of flow field and overpressure under coupling condition and uncoupling condition are basically the same.Under the condition of coupling, the tank internal combustion time is fewer than under uncoupled condition by 60 ms, the overpressure peak load is 10% smaller than under uncoupled condition.② During the process of explosion, the deformation at the top of the tank is the largest, and the maximum stress appears at the top-wall and bottom-wall connection areas.Considering the actual engineering conditions, the principle of “weak roof connection design” should be followed in design.
  • SHI Jianfei1,2, GOU Xiangfeng1,2, ZHANG Yanlong2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 238-244.
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    The dynamic model of a two-degree-of-freedom damping boring bar system was established considering the nonlinear factors of rubber ring and damping fluid.The erosion of the safe basin and bifurcation process of the system were studied.The influences of initial values on the system security and the evolution of the system parameters during the safe basin erosion were examined by numerical methods.Under the condition of certain parameters, two kinds of erosion processes of the safe basin mamely the fractal boundary erosion and smooth bound-ary erosion would occur in the system.The difference between the fractal boundary erosion and smooth boundary erosion was analyzed by the Top Lyapunov Exponent of the system during the erosion process of the safe basin.The results show that the Top Lyapunov Exponent of system will be more than zero, and the chaotic motion of the system will occur when the fractal boundary erosion appears.When the smooth boundary erosion appears, the corresponding Top Lyapunov Exponent will be always less than zero, and the chaotic motion of the system does not occur in the process of the safe basin erosion, however, the amplitude of the system vibration will increase and finally jump out of the safe area.The results are helpful to select the system parameters.
  • LI Huihui1 LI Lifeng1, 2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 245-254.
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    The effects of multi-correlation among design variables in the traditional uniform design-response surface methodology and correlations among structural random variables on seismic fragility analysis were studied.Introducing the Nataf transformation and combining it with the uniform design-response surface methodology based on spline transformation, an alternative method for bridge seismic fragility analysis was proposed.A multi-span reinforced concrete continuous girder bridge was taken as a case-study, its finite element model was built by using the OpenSees software and a nonlinear time-history analysis was conducted.In the study, the damages of pier, lead rubber bearing (LRB), plate-type elastomeric bearing (PETB) and abutment were taken into account.Then, the traditional uniform design-response surface methodology and the improved one were applied to analyze the seismic fragility of the case-study bridge and their results were compared.It is concluded that the response surface established by the improved methodology can better fit the structure's surface limit state function.By using the improved methodology, the failure probability of bridge components and bridge system under different damage states has a certain degree of reduction.The seismic capacity of the bridge tends to be underestimated by neglecting the correlations among structural random variables and using the conventional uniform design-response surface methodology in seismic fragility analysis.
  • LUO Yunke, ZHANG Xun, LI Xiaozhen, RUAN Linghui
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 255-262.
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    A field test was carried out on a semi-closed noise barrier installed on a high-speed railway bridge.The vibration accelerations of the track structure, box-girder and semi-closed noise barrier were measured under the excitation of wheel/rail dynamic forces.The recorded signals were analyzed both in time domain and one-third octave band frequency domain.Based on the theory of train-track-bridge coupled vibration, a box-girder-noise-barrier coupled vibration model was built to simulate the vibrations of noise barrier.The computed results were compared with measured data to make sure the accuracy of the numerical model.Finally, the numerical model was used to analyze the vibration characteristics of the noise barrier and to discuss several vibration reduction measures.The results show that the vibration attenuation characteristics of the rail, track slab, bearing base, box-girder and noise barrier are consistent with those measured along the vibration transmission path.The dominant frequency ranges of vibrations measured on the vertical strut are located in 20-63 Hz and 100-500 Hz, with peak values at 40 Hz and 125 Hz.The proposed model shows satisfactory accuracy in simulating train-induced vibrations of the box-girder and noise barrier.The integrated vibration acceleration level of noise barrier rises along with the increasing train speeds at a rate of 3.5 dB per 50 km/h.The noise barrier vibrations at mid-span cross-section are more severe than that at other cross-sections, and the vibration of the cross beam is more severe than that of the vertical strut.Increasing the noise barrier stiffness and adding inclined braces at the outer side of the box-girder flange slab can both reduce noise barrier vibrations, and the later measure is verified to be more efficient by simulations.
  • XIE Miao HUANG YaXing LU JinNan LI HaiChao ZHAO ZeHua
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 263-268.
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    Blades are important components of an aeroengine.and the flow characteristics of blades are related to the working performance and safety of the engine.A kind of blade was taken as a research object.Its flow test system was designed, taking into account the structure specialty and the working principle of the test system.A PLC control system,combining a genetic algorithm with the PID control method was proposed to ensure the stability of the test system and measurement results.From the simulation results,it is shown the PID control with the genetic algorithm has obvious advantages over traditional PID controls in the aspect of optimizing efficiency.The PID control method based on genetic algorithm improves the accuracy of blade flow detection by 0.17% and it is attested by experiments that the measurement repeatability reaches 100%.
  • CHENG Lin LIU Qihua ZHAO Wenjie LIU Tao JIANG Yaoquan ZHANG Xiaohu LU Bocong
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(22): 269-273.
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    In order to solve idle shake problem for a passenger car, vibration test and analysis was done firstly. Then, powertrain mounting system rigid modal test was done, and the root cause of the idle shake was confirmed. Vehicle 16-DOE CAE model was set up to analyze mounting stiffness sensitivity, and optimized proposals were suggested through the simulation method. The analysis process shows good coincidence with validation results.