28 March 2018, Volume 37 Issue 8
    

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  • LI Kang-qiang FENG Zhi-peng
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 1-8.
    Abstract ( 426 ) Download PDF ( 345 )   Knowledge map   Save
    In order to identify modal parameters for a planetary gearbox which has property of multi-degree of freedom, low frequency, and dense frequency, a new approach was introduced in conjunction with the empirical mode decomposition (EMD) and energy operator (EO). A vibration signal was decomposed into several intrinsic mode functions (IMFs) via the EMD method to determine the mode order and to satisfy the requirement of the EO. Then we estimate the modal frequencies of each IMF via the higher order energy operator. According to the correlation between IMFs and the original signal, we could distinguish the mode order by the size of frequency. In essence, the damping ratio reflects the energy attenuation. Meanwhile, the energy operator can track the system energy. Based on the aforementioned two theories, we put forward a half cycle energy operator (HCEO) method to estimate damping ratio. By comparing conventional methods, the proposed method was illustrated and verified by simulations and experiments. The results show that the proposed method is effective to extract modal parameters of a planetary gearbox.

  • XIE Qin, ZHOU Zhen, KONG XiangYu, MENG Shaoping
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 9-16.
    Abstract ( 276 ) Download PDF ( 82 )   Knowledge map   Save
    Self-centering bucklingrestrained brace (SC-BRB) dual systems are composed of moment resisting frames and SC-BRB frames. The analysis models of SC-BRB dual systems with different shear ratio (the ratio of shear bear by moment resisting frame to the design base shear) were built by adopting two kinds of modeling methods, considering beamcolumn degradation and without considering beamcolumn degradation, respectively. The nonlinear static analysis and dynamic time history analysis were conducted to investigate the influence of beamcolumn degradation and shear ratio on seismic performance of SC-BRB dual systems. The result demonstrates that considering beamcolumn degradation will decrease the structural base shear, and weaken the influence of the lateral stiffness mutation between adjacent floors, which may change the peak story drift ratio distribution along the structure height, but increase the residual deformation of structures; the increasing of shear ratio will increase the influence of beam-column degradation, and weaken the flag shape hysteretic characteristic of the whole structures, but can effectively decrease the peak story drift ratio and deformation concentration effect of structures under earthquake.

     
  • ZHENG Zhe1,LI Xiaobin2,HUO Qiji3
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 17-21.
    Abstract ( 264 ) Download PDF ( )   Knowledge map   Save
    In this work, the process of a cylindrical fragment penetrating a fiberreinforced composite sandwich plate was analyzed. Based on the law of energy conservation, the energy consumption in the three stages of the cylindrical fragment penetrating fiber reinforced composite sandwich plate was theoretically derived, including the penetration of panels, the penetration of composite laminated, and the penetration of back. Then the analytical model of the cylindrical fragment penetrating the fiber reinforced composite sandwich plate was built, and the calculating formula of residual velocity was obtained. The ballistic limit could be obtained when the residual velocity was equal to zero. Comparing the results calculated by the analytical model with experimental results, the feasibility and effectiveness of the analysis model was verified.
  • LVJingxiang, YU Jianbo
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 22-27.
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    In order to extract fault features embedded in weak signals consisting of much noise, a new method named local mean decompositionmultilayer hybrid de-noising (LMD-MHD) was proposed. A series of product functions (PFs) were obtained after LMD. Multiple criteria decision was proposed to select the effective PF components reasonably, which combined quantitative ability of each index at different fault stages. Then, the wavelet threshold de-noising was used as the pre-filter process. The order of effective ranks was determined by the number of main frequency in the Fast Fourier transformation result of the signal. Experimental results on the actual bearing vibration signals demonstrate that this method can effectively remove interference of noise and extract the faint fault features. Thus, the proposed method can be used to improve the accuracy of bearing fault diagnosis.
  • YANG Cheng1,LAI Yuanming1,2,WANG Xu1,GAO Jianqiang2,WEI Zhoubin3
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 28-33.
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    Aiming at the Yellowstone sandpebble formation under the first shield of Lanzhou Subway, this paper selected a linear elastic model and extended the linear DruckerPrager plasticity model to simulate the constitutive relationship of pebble material and established the numerical calculation model of shield rock breaking in rockpebble formation. The rock breaking effect on the Yellow River pebble stratum in several different situations was analyzed when Blade cutting speed was 0.6 m / s, 0.8 m / s, 1.0 m / s, 1.2 m / s; cutting depth was 6 mm, 9 mm, 12 mm, 15 mm, 18 mm; cutter spacing was 12 cm, 16 cm, 20 cm, 24 cm; The rake angle was 10 °, 15 °, 20 °, 25 °. According to the calculation results, when the blade rake angle is 20 °, the pebble equivalent stress suddenly increases to provide rock breaking stress, and the rock breaking effect is the best. In addition, the rock breaking effect was analyzed when the hob pitch is 8 cm, 12 cm, 16 cm, 20 cm, 25 cm, 30 cm and 36 cm respectively. The rock breaking effect was the best when the hob pitch was between 12 cm and 16 cm.

  • WANG Xiaosong1,GUO Zengwei1,YUAN Hang1,ZHAO Lin2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 34-41.
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    Base on longtimemeasured data of typhoon ‘Bolaven’ recorded at the Xihoumen Bridge, wind characteristics, such as wind speed, wind direction, turbulence intensity, probability distribution and its extreme and average value of gust factor under different averaging time periods were investigated. It was shown that the turbulence intensity and gust factor of Balaven were decreasing with average wind speed in three directions, and that the mean statistical result of turbulence intensity related to longitudinal fluctuation components was 0.161 at high wind speed, which was higher than the recommended value. The gust factor analysis results show that the probability distribution of gust factor is converted from extreme value type III to type II with gust averaging time, and the statistical value of gust factor at 95% confidence level is identical to the recommended value in load code for the design of building structures. It is also discovered that Logarithmic Gauss distribution function can be used to describe the relationship between gust factor and its corresponding time interval.
  • CAI Yangsheng1, 2,ZHAO Yuezhe2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 42-46.
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    According to the standard deviation given by ISO 129991 and GB / T 31004.1—2014 , the measurement uncertainty of the sound pressure method and the sound intensity method in the normal frequency range (100-5 000 Hz) and the extended lowfrequency range (50-5 000 Hz) were calculated with the approach determining the singlenumber quantity and its measurement uncertainty. The results show that the uncertainty of the sound intensity method in the normal frequency range is less than the sound pressure method, and less more evidently with the extended low frequency range, which means that the sound intensity method has better low frequency measurement robustness, and consistent with previous experiments results. Finally, comparing the measurement uncertainty of two building elements, the results show the elements with poor lowfrequency sound insulation will produce higher uncertainty.
  • YANG Hui1WANG Yan2LIU Rong-qiang3
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 47-53.
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    Tapespring flexible hinges can be folded elastically and can selfdeploy by releasing stored strain energy, which have important potential application value in the deployment mechanisms of satellite and solar array. Based on both the Calladine shell theory and the von Karman large deflection plate theory, a total strain energy analytical model was proposed for the large deflection bending properties of the isotropic tapespring flexure hinges under pure bending. Nonlinear bending moment was derived by applying the minimum potential energy principle. This study incorporated longitudinal stretching, longitudinal and transverse bending variations into the analytical model. Numerical studies were performed to analyze the influences of geometric parameters on peak moment. The experimental apparatus was performed to verify the analytical model. Twelve nickel titanium tapespring flexure hinges with different radius of curvature, thickness, and subtended angle were constructed to measure. Peak moments of each tapespring flexure hinge under equal and opposite bending during quasistatic folding were measured to verify the theoretical model. The proposed research can be applied to analyze and test other thinwalled flexure hinge under pure bending, which is of great importance to design of flexure hinges.
  • YING Lei1,ZHOU Ding1,FANG Zhongjie2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 54-59.
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    The sloshing response of liquid in a rectangular container with a rigid baffle under horizontal and pitching loads was studied. By introducing artificial interfaces, the complicated liquid domain was divided into several simple domains. Based on the superposition principle, the method of separation of variables was used to obtain the velocity potential of every subdomain. The potential function under horizontal loads was assumed to be the sum of impulse potential and convective potential. The convective potential was obtained by the mode superposition method. After substituting the impulsive and convective potential function into the free surface wave conditions, the dynamic response equations with generalized coordinates was established. According to equal dynamic shear and moment, the equivalent mechanical model under lateral loads was constructed. An approximate analysis of dynamic response of container under pitching excitation was carried out. The results calculated by the Newmark β method were compared with those obtained by the finite element method, which showed excellent consistency. Analysis of the length and height of baffle and the ratio of height to width of the fluid in the adequate was carried out. 
  • YANG Yongzhong1, 2,BI Yuhua1,ZHANG Ning2,XIANG Rong1,
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 60-67.
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    The bad working conditions of nonroad diesel engines have high requirements on the vibration and noise performance of the whole machine. A nonroad high pressure common rail diesel engine was used as the studying object in this paper. A multibody dynamics model for the engine was established.  Through the body and crankshaft modal testing, the accuracy of the whole finite element model and the multibody dynamic model were verified. Through establishing the valve dynamic model, the piston dynamic model and the shaft dynamics model, the main exciting force of the valve train load, the piston knock load and the main bearing load could be calculated. This paper also studied the different excitation on the machine vibration and noise. The results show that with the application of load excitation, the surface vibration velocity of the engine increases correspondingly. After loading the valve train, the vibration speed of the engine increases slightly in the high frequency range. At 500 Hz and 1 000 Hz, the influence of velocity is larger. The secondstage motivation of piston exerted greater influence on the midand highfrequency vibration of the characteristic points after loading the piston side striking force. With the increase of load excitation, the surface acoustic power level of each component basically increases. The load of the valve train has great influence on the vibration velocity of the cylinder head cover, and the piston side striking force is the main influence factor of the idle mechanical noise of the main shell parts.
  • CAI Anjiang1, LIU Lei1, LI Ling1, ZHANG Hua1, YANG Yuanwen2, ZHEN Tao3
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 68-74.
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    Considering the influence of dynamic contact characteristic in gear shaving is of great significance for analyzing the mechanism of concaveerrors caused by shaving. Here, a mechanical model was established by the elastoplastic theory and loaded tooth contact analysis (LTCA). The meshing contact characteristic under different loading conditions was obtained by corresponding calculation methods with the model. The formation mechanism of the concave error was described. In order to verify the correctness of the calculation, the data of contact stressstrain and the partition of elastoplastic deformation were identified by the finite element method (FEM). The shaving experiment was performed to verify the theoretical analysis. The result shows that the area of plastic deformation increases nonlinearly with the load. The stress of the dedendum area is larger than the addendum’s and the maximum of stressstrain appears in areas near the pitchcircle (PC). The accumulation of plastic deformation and mapping of the errors in the periodic shaving make obvious concave errors. Compared with simulated results of FEM and shaving test, the values of stress and the partition of plastic deformation are reliable, and the conclusion about transmission performance of gear shaving are correct.
  • FENG Jun1,2LIWen-bin1XULei 3 CHENYu 1 CHENXi 4
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 75-81.
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    Based on a mesoscale discrete method titled Lattice Discrete Particle Model (LDPM), this work established a numerical simulation model for plain concrete thick target penetration. A brief introduction of LDPM basic assumptions and mesoscale constitutive laws was presented, which was followed by LDPM parameters calibration according to the hydrostatic compression and triaxial compression tests data. The proposed numerical model was validated for the concrete penetration problem in terms penetration depth and projectile deceleration curves during penetration process. With the calibrated LDPM parameters for 23 MPa strength concrete, this paper derived the penetration resistive force by conducting LDPM deep penetration simulations. Combining the Forrestal equation, the target static resistance was then obtained which indicates that either the CRH nor the penetration velocity hardly affects the target static resistance, meanwhile projectiles with 3 times, 6 times and 8 times maximum aggregate size suffer 260 MPa, 175 MPa, 163 MPa target static resistance.
  • YOU Jin, HOU XiangYang
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 82-86.
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    Previous researches concerning random energy flow analysis (REFA) were mainly based on model simulations. In this paper, tests were carried out respectively on a single plate and an Lshaped plate, based on which the validity of REFA was investigated. Because inner loss factor (ILF) is an important input condition for accurate REFA numerical simulation, the ILF testing method based on REFA was proposed and compared with that from the traditional SEA approach. Through the tests on the single plate, the ILF was obtained based on REFA and traditional SEA, and the results from the two methods were compared. For the tests on Lshaped coupled plates, the input power spectrum of the random force was measured as known input to the REFA numerical model of the test plates, and with the ILF test results, the responses of the plates were predicted considering the coupling between flexural and two inplane waves. A good agreement between predicted and measured response spectra for flexural wave field was observed, which verified that REFA is a reliable approach.

  • LIU Wenpeng,LIU Yongqiang,YANG Shaopu,GU Xiaohui
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 87-92.
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    In practical applications, the types of occurring faults on rolling bearing are typical and fault impact signal is cyclical. In view of the characteristics, a typical correlated kurtogram algorithm was proposed in this paper. Based on the ideas of typical kurtogram of hierarchy and selecting central frequency, the kurtosis was replaced by correlated kurtosis, not only avoiding the noise interference introduced by the wideband demodulation, but also making full use of the periodic information of typical fault impact, and then the method located typical fault impact signal interested in the frequency range rapidly, relying on the optimal spectral correlated kurtosis. And the algorithm was applied to determing the optimal demodulation frequency band. Through the study on simulation and wheelset bearing experiment signals, the results show that the typical correlated kurtogram algorithm can locate resonant frequency band effectively and adaptively and have a great superiority in both accuracy and stability.
     
  • ZHAO Xiang,LIU Zhonghua,WANG Sheliang,YANG Tao,ZHAN Meng
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 93-98.
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    Based on the traditional TMD, a new type of variable damping TMD was designed and made. Using the theory of fluid mechanics, the equivalent damping coefficient of the damper was deduced. The MATLAB/Simulink simulation model of the variable damping TMD system was established and conducted on a scale of 1/10 small wild goose pagoda structure model, and the dynamic response of simulation was compared with the result of shaking table test. At the same time, the analysis method was further applied to the prototype structure of the small wild goose pagoda. The results show that the simulation results are consistent with the experimental consequence, which verifies the reliability of the simulation method. In view of the small wild goose pagoda prototype structure, variable damping type TMD can significantly reduce the earthquake response of the structure. The greater the response of the structure itself, the better the control effect. When the structure itself is less responsive, it can get better control effect due to the action of variable damping.

     
  • JIAO Chiyu1,3,LU Ziming1,2,LONG Peiheng2,SHI Xiaopeng1,2,HOU Suwei2,4
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 99-106.
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    In this paper, several typical numerical simulation methods for urban bridge abutment, such as simplified abutment model, spring abutment model and elastic beam element abutment model, were introduced firstly. Then, the numerical model of different degree of refinement considering the soilabutmentsuperstructure interaction was established with the background of an overpass curved bridge. The nonlinear dynamic timehistory response analysis under the condition of artificial ground motion was carried out and the calculation errors of different numerical models were compared and analyzed; The variation of bridge internal radius, the internal force of pier bottom, the relative displacement of pier and beam, and the relative displacement of bridge girder were discussed. The results show that the simulation response of the bridge abutment can be more accurately reflected by the improvement of the simulation precision of the soilabutmentsuperstructure interactions; especially the elastic beam element abutment model can comprehensively consider the dynamic response of abutment. Considering the soilabutmentsuperstructure interactions, the smaller the radius of curvature, the greater the lateral force and displacement of the piers.

  • YANG Renshu1,SU Hong1,GONG Yue2,QIU Peng1,FU Xiaoqiang1,ZHANG Shichun1
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 107-112.
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    In order to study the mechanism of the interaction between the stationary crack and the moving crack, the impact experiments of the precracks with different length were carried out by a digitallaser dynamic caustics test system.Experimental results show that the initiation stress intensity factor and the initiation time of the vertical main crack decrease with horizontal main crack length. The longer the horizontal main crack length, the easier the vertical main crack initiation. During the vertical main crack propagating towards the horizontal main crack, the mean value of the stress intensity factor of the wing crack and the peak value and the mean value of wing crack propagation velocity decrease with horizontal main crack length. After the wing crack and the vertical main crack coalescence, stagnation time and the initiation stress intensity factor of the vertical main crack first decreases and then increases with vertical main crack length.
     
  • WU Jianyuan1,2,LONG Yuan2,JI Chong2,LI Xinghua2,MA Huayuan2,CHENG Liangyu2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 113-119.
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    In order to study the shock and vibration harmful effect generated by high pressure gas pipeline bursting, full-scale bursting experiments of X90 pipes were conducted in this study. In the experiments, the crack velocity, pressure variation inside the pipe and vibration velocity on the ground were measured. The experimental results were analyzed to reveal the formation mechanism and propagation law of the seismic waves generated by pipes bursting. In the data processing process, the Hilbert-Huang Transform (HHT) was used to analyze the vibration signals, and the time-frequencyenergy distribution of the signals has been shown by HHT precisely and clearly. Additionally, this paper has verified that HHT has superior performance in revealing hidden physical meanings in data and is suited for analyzing non-stationary dynamic vibration signals.

  • NIU Zhidong 1 WU Guangqiang1, 2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 120-124.
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    A vehicle experiment was carried out to study the chaotic dynamics of electric vehicles, and chaotic time series were predicted by using wavelet neural network. First, the experiment of electric vehicle on mediumBelgian road was carried out, the vertical vibration acceleration signal of the right front wheel center and battery bottom center were obtained. Second, timefrequency analysis, threedimensional phase diagrams and the Poincaré sections of the signals were obtained. The time delay was calculated by using the mutual information method, and also minimum embedding dimension was got with the Cao method, the largest Lyapunov exponent was got with Wolf method.  The presence of chaotic motions in the vertical acceleration signal was found. Finally, chaotic time series of the right front wheel center vertical signal was predicted using wavelet neural network. It is found that the use of wavelet neural network to predict chaotic time series can achieve better results.
     
  • HUANG Dong1,2,ZHAO Yu1,2,CHEN Yulong3,TANG Junfeng1,2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 125-131.
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    As the safety hazard of the wind turbine collapse on the buried pipeline threatening the ChinaMyanmar pipeline project, three scenarios were induced based on four common failure modes of wind turbine collapses. By using the formula of penetrating power, the impact force and impact depth resulted from the wind turbine collapse were estimated. The change patterns of stress and strain parameters of the pipeline u was analyzed. The result of safety evaluation was given. The results show that if the impact is only from the wind turbine collapse, the pipeline is not damaged even with a large ovality change of the pipe, but it is difficult to ensure the normal operation of the pipeline; if the damage is caused by the wing turbine and blades or only by blades, the downward penetrating force is so large that the pipeline will be directly sheared off. Therefore, it is suggested that the connection strengths of blades above the pipeline be appropriately strengthened, in order to prevent the incident of blades to damage the pipe and shear off the ChinaMyanmar gas pipeline from happening.

     
  • LV Wenlong 1, 2, WU Bo,1
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 132-140.
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    Based on extensive numerical analyses, torsional response of the frameshear wall structures with partial columns sliding at upper ends (FSPCS), due to accidental eccentricity and induced by earthquakes, have been investigated. Influences of the structural period ratio and lengthtowidth ratio on such response have been revealed. A comparison between the torsional response of the FSPCS and that of the conventional frameshear wall structure (CFSWS) was presented. It can be found that: ①when the accidental eccentricity is taken into account, the elastic torsional response of the FSPCS is less than that of the CFSWS, and the influences of the structural period ratio and lengthtowidth ratio on the FSPCS are almost the same as those on the CFSWS; ②with the increasing of the structural period ratio, the enhancing range of the top storey’s maximum horizontal displacement of the FSPCS under major earthquake generally increases, but in most cases is less than that of the CFSWS. Meanwhile the enhancing range related to the FSPCS under major earthquake is lower than that under minor earthquake; ③with the increasing of the lengthtowidth ratio, the enhancing range of the top storey’s maximum horizontal displacement of the FSPCS under major earthquake generally exhibits a trend of increasing first and then decreasing later, and the enhancing is significant when the lengthtowidth ratio ranges from 1 to 2.
  • WANG Daoyong1,ZHAO Xuezhi1,SHANGGUAN Wenbin1,2,YE Bijun2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 141-145.
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    This paper put forward a dynamic response evaluation index and a calculation method of the powertrain mounting system key on/off condition based on the analysis of the excitation force. Considering that increasing the damping of the mounting system can reduce the vibration when the engine key on/off, a semiactive damping strut was designed and manufactured. The semiactive damping strut provides the mounting system with a large damping, and when the engine is working normally, the semiactive damping strut provides small damping to isolate the high frequency vibration of the engine. At the same time, the influence of different engine starting torque on powertrain vibration was analyzed. Under the condition of large starting torque excitation, the changes of longitudinal acceleration, impact degree, mount dynamic supporting force and VDV of the powertrain were compared after the semiactive damping strut was introduced. Studies have shown that the use of damping strut can improve key on/off vibration to a large extent and save oil as well.

     
  • WANG Le,MAO Ming,LEI Qiangshun,CHEN Yijie,ZHANG Xu
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 146-152.
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    Structure and working principles were expounded for hydraulic inerter with exhelical tube in this paper. The mathematic model of the inerter was established and simplified considering structure friction, fluid stress lose, and inertance. Also, a series of inerter tests were layout, such as stroke test est. The validity of the inerter’s mathematic model was verified through comparing simulated value and test combined with the analysis of damping force and inertance. It is found that under high frequency stimulating the inerter can be treated as a component with a damper multiples a inerter. 
  • WANG Feng,WU Long,WU Dongsheng,LE Jialing
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 153-157.
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    An impulse tunnel can only provide a flow with very short testing period, and the outputs of force balance are oscillatory signals with large amplitude. A new method was proposed to recover the steadystate value from the oscillatory signal. The balance’s signals over the initiation period of the tunnel were omitted and only the signals over the steady testing period were adopted for analysis. This segment of the balance’s signals was regarded as free vibration responses of a multidegreeoffreedom system caused by initial displacements and velocities, and the system was originally in a nonzero steady state supported by constant loads. The free vibration response was formulated with unknown parameters, and an optimization problem was constructed by minimizing the deviation of theoretical response from the measured response. The unknown parameters including the steadystate value of the balance’s output could be estimated by solving the optimization problem. Finally the effectiveness of the proposed method was demonstrated by several application examples.
  • HE Haoxiang1,2,WANG Xiaobing1,ZHANG Xiaofu1
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 158-166.
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    In view of the disadvantages of the traditional low yield point steel plate dampers with high yield point and inadequate adjustability, a compound low yield point steel plate damper was presented, and it is composed of low yield point steel plates and common steel plates. Three kinds of new hollow shape steel plate dampers were presented, which include boundary hollow, interior hollow, and ellipse hollow. The “maximum rigidity” and “full stress state” were used as the new optimization objectives. The topology optimization of different hollow shapes was performed by the alternating optimization method to obtain the optimal shape. Finite element calculation of different forms of compound steel plate damper was carried out. The results show that the initial stiffness of the boundary optimization damper and interior optimization damper is lager, the hysteresis curves are full and the stress is homogeneous. The numerical simulation of two kinds of optimization model dampers with different material ratios and different was carried out. The results show that the yield point of compound steel plate dampers can be regulated. The overall seismic capacity of the frame structure with these two kinds of optimization model dampers was simulated and analyzed. It is evident that the boundary optimization model damper has better energy dissipation capacity.
  • YIN Chao1,ZHANG Jianrun1,SHI Tongmeng1,SUN Zhigang2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 167-171.
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    The initial compaction of road paving mainly depends on the tamper mechanism of paver. The phase relationships have great impacts on the dynamic characteristics of the tamper. For a certain paver, a 2 DOF dynamic model of tamper cross section was established based on the rigid body assumption. The relationships between different tamper beam phase, based segment phase, extended segment phase and the inertia force of tamper mechanism were simulated. The effects of these kinds of phases on the energy of tamper mechanism were obtained, and the phase parameters were optimized. Then, a method for testing screed pressure was put forward to verify the feasibility of optimized phases via the pressure distribution characteristics of the screed to the ground. The results show that when the tamper beam phase is 90° and the extended segment phase is 180°, the tamper mechanism inputs the minimum total energy to the screed, and the screed pressure distribution is more uniform.

  • ZHANG Jingchuan1,YANG Xiaoning1,WANG Jing1,CUI Hanyin2,LI Chao2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 172-179.
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    Aiming at the feasibility of the ultrasonic sensing technology applied in the mars environment, a measurement method of ultrasonic velocity in the low pressure of CO2 environment based on the optical fiber Fabry-Perot vibration sensor was proposed. An ultrasonic velocity test system has been designed and implemented. The pressure in the chamber was adjusted from 600 Pa to 1 MPa with different intervals, using four pairs of piezoelectric actuators and sensors, with central frequencies being 21, 25, 34, and 40 kHz respectively, and was applied to generate ultrasonic signals. The experimental results show that, the optical fiber Fabry-Perot (F-P) pressure sensor can adapt to the low pressure environment and can still receive the ultrasonic signals in 600 Pa CO2 environment. The ultrasonic velocity rarely varies with the pressure in the range from 600 Pa to 1 MPa, while it depends on the composition of the gas and the temperature. The ultrasonic velocity in atmosphere is 336.18 m/s, which is travel faster than in CO2 environment 268.79 m/s, and the ultrasonic velocity in 15 ℃, 600 Pa CO2 environment is 271.51 m/s.
  • YU Bo,WU Ranli,CHEN Bing,TAO Boxiong
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 180-189.
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    In order to overcome the disadvantages of traditional modes which cannot take into account the influence of axial load ratio and need to introduce empirical corrected factor of displacement ductility, an improved shear strength model for shearcritical reinforced concrete (RC) column was proposed. Firstly, an improved shear strength model for RC columns which takes into consideration the influences of axial load ratio as well as the deformation compatibility condition of variable angle truss-arch model was established based on the critical crack angle model that takes into account influence of axial load ratio as well as the deformation compatibility condition of the variable angle truss-arch model. Then the influence of axial load ratio on the shear strength of shearcritical RC columns was discussed. The proposed model overcomes the disadvantages of traditional models. Finally, the applicability and accuracy of the proposed model were validated by comparing with the experimental data and existed models.
  • XU Zhenlong1,SHAN Xiaobiao2,XIE Tao2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 190-199.
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    In recent years, portable electronic devices, microelectromechanical systems (MEMS) and wireless sensor networks have been widely used. The disadvantages of the batteries gradually become obvious. The piezoelectric vibration energy harvester can convert the ambient vibration energy to electric energy, so that the lowpower microelectronic products can be wirelessly powered or selfpowered. To enhance the environmental adaptability and improve the generating efficiency, the broadband piezoelectric energy harvesting turns to be a research hotspot. The principle, piezoelectric materials, and operation modes were presented firstly. The current status of the broadband piezoelectric energy harvester was reviewed. The problems in recent research work were summarized. Finally, the future research directions were proposed. The piezoelectric energy harvesting supplies a stable, safe, and enduring way to power the microelectronic products. It has a good application prospect.

  • ZHAO Zhenhang LI Chenghui GENG Hao FU Na
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 200-205.
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    In order to study the vibration and transmission characteristics of the continuous welded rail under the temperature force, a solid element model of rail was established based on the finite element method. The vertical and lateral harmonic loads from 0-2 000 Hz were applied to the rail respectively, and the vertical and lateral vibration and the transmission characteristics of the rail under different temperature force were analyzed in frequency domain. Results show that with the increasing of the rail temperature, both the vertical resonance frequency and the pinnedpinned resonance frequency of the rail were reduced, as well as the resonance amplitude. Less than 300 Hz, which is the resonance frequency of the rail, the vibration attenuation of the rail is the fastest. The higher the vibration frequency of the rail, the farther away it transmits along the direction of the track line. No matter temperature rises or drops, the attenuation of vertical resonance would slow down. In addition, with the increasing of the rail temperature, the lateral resonance frequency of the rail reduces but the lateral resonance amplitude increases. Compared with the vertical vibration transmission, the temperature force has less influence on the transverse vibration transmission, which has a great influence on the bending vibration transmission in the transverse direction below 135 Hz.
  • SHENG Xi, ZHAO Caiyou, WANG Ping, KE Wenhua, LI Chenghui
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 206-212.
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    When a train is crossing over the floating slab track or the track with vibration isolation fasteners, the vehicle interior noise is so high that it decreases the comfort of passengers. The rolling noise is the main part of the vehicle interior noise, and rail sound power reflects energy size of the rail rolling noise. In order to study the effects of vibration reduction measures on the rail sound power characteristics, the vertical track decay rates and rail acceleration mobility were tested, and relative rail sound power levels under the unit harmonic point excitation were calculated. The results show that vibrationisolation measures change the decay rate and rail acceleration mobility amplitude by decreasing the vertical track stiffness. The track decay rates of the steelspring floating slab bed and the isolationpad floating slab bed have been increased under 200 Hz, and the monolithic bed track with sleepers embedded and GJ-III vibrationisolation fasteners has the lower decay rate than that with DZIII1 fasteners under 2 500 Hz. The rail sound power of the floating slab track increases greatly under 200 Hz while that of the monolithic bed track with GJ-III vibrationisolation fasteners increases greatly under 500 H, when the rail is loaded by the unit harmonic point excitation.

  • WU Jimei1,2, SHAO Mingyue1, WANG Yan3, WU Qiumin2, ZHU Libin2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 213-217.
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    The printing cardboard substrate with gram weight of 250 g/m2 of Shaanxi Beiren PRC250 cigarette package special type of gravure printing unit was taken as the research object. The printing cardboard with a certain thickness and a certain flexural rigidity was simplified as a thin plate model based on the moving thin plate theory. The stability of the printing cardboard with moving speed was studied. The dynamic model of moving printing cardboard was established. The transverse vibration differential equation of moving printing cardboard was obtained by the energy method and the variational principle. The transverse vibration differential equation was discretized using the Galerkin meshless method. Then the complex characteristic equation was obtained. The effects of different boundary conditions on the dynamic stability region of the moving printing cardboard were discussed by numerical calculation. The divergence instability critical speed of the printing cardboard of PRC250 cigarette package special type of gravure printing unit was obtained, which conforms to the boundary conditions with two opposite edges simply supported and the other two opposite sides free. And the divergence instability critical speed is 27.55 m/s. This conclusion provides a theoretical basis for the determination of the stable working range and structural optimization of the printing equipments.
  • WANG Lufeng
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 218-224.
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    In this paper, an optimization design method based on the Particle Swarm Optimization (PSO) technique was proposed for the enhancement of the passive suspension system performance of heavy vehicles. The optimization problem based on a quartervehicle model aims to minimize the dynamic tire load subject to constraints on the natural frequency of the unsprung mass. PSO was applied to solve the optimization problem for obtaining optimum parameters, such as the suspension damping coefficient and spring stiffness. In order to assess the obtained design parameters, the suspension performance was estimated in time and frequency domains for different road excitations. And some essential differences between PSO and Genetic Algorithm (GA) were discussed in detail. The results show that, for the same suspension system, the proposed method can obtain the optimum designed parameters quickly compared with the previous designed parameters using the GA, which will provide important parameters for the subsequent revised design.

  • HU Tonghao, SHEN Jiping, YAO Linquan
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 225-237.
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    Based on the twodimension linear elastic theory, the inplane free vibration differential equations for radial functionally graded piezoelectric (FGPM) annular plates were derived. Using the differential quadrature method (DQM), the differential equations and boundary conditions were discretized and the characteristic equation of the frequency was obtained. Assuming that the physical parameters of the material vary in the form of a power function, the dimensionless natural frequency of inplane free vibration of FGPM annular plates were solved numerically. The influence of the gradient exponent p, the inner to outer diameter ratio η, the stiffness of elastic boundaries k and piezoelectric effect of the radial FGPM annular plate on the dimensionless frequency was considered under the combination of elastic boundary and the open electrical boundary. Finally, the modal characteristics of radial FGPM annular plate were studied.
  • SU Fan, ZHANG Hang, YIN Zhongjun
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 238-244.
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    The nonobstructive particle damping (NOPD) has been widely used for its simplicity and high efficiency in attenuating structure vibration. In this paper, the discrete element method (DEM) was applied in the simulation. The damping effectiveness of NOPD was analyzed combining with the motion modes of the granular system to obtain the influence of different vibration conditions on damping property. And the energy dissipation mechanism was illustrated at the mesoscale. The effects of the material parameters of particle on the loss factor including density, shear modulus, coefficient of restitution, coefficient of static friction, coefficient of rolling friction were also studied based on the orthogonal experiment method. The results show that the different motion modes of rheology behaviors and the mesostructure lead to variations of the damping effectiveness. The NOPD achieves the optimal performance and better operation in the buoyancy convection state. In addition, the effective weights of the material parameters of particle are different. The coefficient of static friction and density play important roles in the damping effectiveness of the granular system.
  • ZHANG Lijie1,2, E Dongchen1,2
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 245-250.
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    Faults of the hydraulic system of car dumper occurred frequently and the faults bave a serious impact on production. Its condition monitoring and fault diagnosis has important practical significance. According to characteristics of working process of car dumper is intermittent and timevarying, adaptive multiway principal component analysis (MPCA) was used for condition monitoring and fault diagnosis. Covariance matrix was updated adaptively using the weighted recursive algorithm. Impact of new data on final model was adjusted by weight. Contribution rate of Q can not reflect the degree of deviation from normal range of each process variable that leads to inaccurate results of fault diagnosis. Parameter of principal component contribution rate t was used for fault location which directly reveals the change degree of process variables. The operation of the online monitoring system over car dumper proved that the adaptive MPCA method can accurately detect fault in time. The accuracy of fault diagnosis is up to 90% based on the t contribution rate.
  • LI Guang, WANG Zirui, SONG Haiyan
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 251-256.
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    A prediction method of vibration damage for apples in transportation package of apple is was proposed. The stress value of apples under vibration was predicted through the relationship between the contact area of apples on pads and loads, and whether the stress value reaches the critical stress of apple damage can be judged. Apples in different ranges of quality and diameter were chosen, and compression tests were carried out with different density and thickness of EPE pads. The curves of contact area and relative deformation of pads (S—-ΔX curves) and curves of loads and relative deformation of pads (F—-ΔX curves) were obtained, and corresponding liner fitting equations are also obtained, and the fitting degrees were more than 95%. After the instantaneous load F on apple was calculated, the relative deformation of pad ΔX at the instantaneous load could be obtained via F—-ΔX curve, and then the contact area S at this ΔX can could be gotten via S—-ΔX curve. The theoretical stress F/S could be calculated. The vibration damage of apple could be judged compared with the critical stress value of apple damage.
     
  • DENG Hongzhou, DUAN Chengyin, XU Haijiang
    JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 257-262.
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    Wind field parameters of normal wind field and typhoon wind field were determined in accordance with references. An aeroelastic model of a towerline system consisted of five towers and four lines was designed with the discrete stiffness method. Then wind tunnel tests at various wind speeds and incident angles were conducted and windinduced response and wind vibration coefficient of the transmission tower and towerline system were compared. Test results show that mean displacement and RMS acceleration under typhoon wind field are larger than those under normal wind filed. When test wind speed is about 7 m/s,the differences of mean displacement are approximately 20% for transmission tower and 30% for the towerline system, while the differences of RMS acceleration are respectively 50% and 100%. Wind vibration coefficient under typhoon wind field is more than 7% larger than that under normal wind field. Thus the influence of high turbulence characteristics of typhoon wind field on the magnification of windinduced response and wind load should be noticed in designing transmission towerline systems in typhoon regions.