In order to study the characteristic of blasting seismic wave, by using methods of the fractal box-dimension and multi-fractal theory,The box-dimension and the Multifractal spectrum was gotted through its theorys derivation and matlab calculation.Then the fractal characteristic of Blasting seismic wave was analysed.The results indicate that the fractal box-dimension reflects the complexity and frequency structure of seismic signal.It shows that box-dimension describes the seismic signal as a whole. Multifractal can describe the detailed characteristics of the seismic signal.Its spectrogram describes the probability information of different singularity index a. So this paper proposed methods of the fractal box-dimension and the multi-fractal to obtain the strength、the structure of frequency spectrum and the local singularity characteristic of the blasting seismic.

A new method is proposed in this paper to improve the precision of spectrum correction of damped free vibration response based on frequency-domain. The principle of this method is that a length of continuous, free, damped vibration signal is sampled and its analytical signal is constructed, then N points Fast Fourier Transform (FFT) is performed to the analytical signal from its starting data point and the (L+1)-th data point. Finally, the modal parameters are calculated by the parameters of two corresponding peaks of amplitude spectrums. This method can reduce the spectral leakage of negative frequency component caused by FFT. Results of Simulations show that the precision of spectrum correction can be rather high when the natural frequency of each modal parameter is far from the others. However, the method cannot be used if one natural frequency is very close to the others or the modal coupling is very serious.

In order to do research on the method to accurately and quantitatively evaluate the authenticity of the re-sults of the HIL (Hardware-In-the-Loop) simulation system for on-orbit docking, a verification model for the HIL simulation system for on-orbit docking dynamics was established with no-damp elastic vibro-impact model. The evaluation parameters describing the authenticity of the HIL simulation results were presented, and their calculation formulas were derived. Then a verification mechanism for the HIL simulation experimental test was designed. The experimental verification method was presented in detail. The experimental test facility was established, and verifica-tion test was done on horizontal and vertical moving degrees of the experimental system. The testing results and the system tuning process show that the verification ideas and method of the HIL simulation system for on-orbit docking dynamic is feasible and practical.

Based on the theory of elastic-plastic response spectrum and the relationship between displacement ductility and equivalent damping ratio of the non-linear restoring force model, according to the results of single-mass elasto-plastic analysis, the elasto-plastic response spectrum of isolated structure is established. Further comparison of and elasto response spectrum, the results showed that the value of the elasto-plastic acceleration response spectra in the long cycle of the spectrum, damping attenuation coefficient is larger. Based on the results of single mass elastoplastic analysis, the elasto-plastic response spectrum formula of isolated structure is established. In the end of the paper, aim at the shaking table test of a 5-story steel isolation structure, the earthquake response of isolation structure is compared by using the new suggestion modified acceleration response equation and time history analysis method, and the results obtained with the modified long period response spectrum is consist with the results of time history analysis and test. The response analysis results by using the suggestion equation of response spectrum value have a higher analysis precise for isolated structures.

Abstract: Based on mode coordinate, the optimal vibration control of truss structure is designed. Using the approximately discrete method, the approximate solutions of structure closed-loop response are obtained. The approximate solutions can substitute for the exact solutions. The randomness of physical and geometric dimensions parameters of truss structure was considered and represented in the form of random factor. And then, the computational expressions of the mean value and the variance of the stochastic parameters structure closed-loop response under the optimal vibration control were derived by means of the random variable’s functional moment method. Finally, the influence of the randomness of structural physical and geometric dimensions parameters on the structure closed-loop response is analyzed by example with the method of this paper and the Monte Carlo method, validating the feasibility of this method discussed by this paper.

Against the complex coupled vehicle-bridge problem, the triple-beam model was applied to model the bridge structure and a simple separate iteration solution method was presented based on ANSYS program. The detailed derivation process and computational procedures of the problem are also presented and validated by the field dynamic test of a preselected dual-box girder curved bridge. The inverse fast Fourier transformation is applied to generate road irregularity and its velocity term of grade B according to power spectral density of road roughness. The radius of curvature, vehicle speed effects are analyzed on the dynamic amplification factor (DAF) of curved-bridges considering the traveling eccentricity of the vehicle. The results indicate that the DAF of curved bridge are larger than straight bridge’s, and DAF of internal forces and displacement at different position differ significantly. The internal forces and displacement have variant sensitivities to radius of curvature, and they change greatly while the radius of curvature smaller than a certain characteristic value.