Considering the influence of the uncertainty of design variables on the optimization design, the robust optimization design theory was used to build a robust model for the powertrain mounting system of automobiles. In this model, decoupling of energy distribution was taken as the target, the stiffness parameters of the mounting was taken as a design variable, and the mean and standard deviation of the target results were considered. Aiming at the problem that the particle swarm algorithm was easy to fall into a local optimal solution, a hybrid particle swarm algorithm was adopted to optimize the stiffness of the mounting of the powertrain mounting system, and the Monte Carlo method was used to analyze the optimized results to examine the influence of the variety of design values on the objective function. The results show that the method can improve the robustness of the mounting system effectively.

Resonance-free vibration isolator of model GWF dissipates vibrating energy by means of Coulomb-damping and elastic deformation, and it is widely used in vibration isolation for electronic equipment due to no harmonic peaks. Based on analysis of theoretical model, the unlock frequency and vibration isolation transmissibility for the GWF vibration isolator were obtained, the correctness of the theory was verified and an experimental and theory basis for selecting appropriate stiffness and friction force were provided.

The noise in cabin of a domestic mining vehicle was far beyond the industry standard. Thus, according to the standard, the noise and vibration testing of the cabin was conducted. Utilizing the spectrum analysis, order tracking technique and theoretical analysis, the main noise sources and their frequency characteristics were identified. Some effective improvement strategies were proposed. Through the comparative analysis of the testing data of the improvement strategies, the correctness of the noise source identification methods were verified. The result of analysis provides a reference for the noise control of mining vehicles.

The finite element model of a tire was established by means of ABAQUS. The modal of the tire was computed and also measured in testing. The results were compared each other and the correctness of the finite element model was verified. Then, the rolling process of the tire on the road was simulated, and output of the reaction force of the road was obtained. Based on the concept of acoustic transfer vector, the MATV technology was used to compute the radiation noise response of the tire under the random excitation, and the results were analyzed and discussed.

The interior noise of a car in different conditions is tested according to our national standards. Using Fourier transform, the spectrum analysis is done for the signals and the critical frequency is obtained. It is found that in rapidly accelerating conditions, Fourier transform can only yield overall trends of the interior noise variation, and the detailed information cannot be obtained. Then, the “adaptive changes” time-frequency window structure of wavelet transform is used to gain the details of the signals and more frequency information.

Aiming at the problem of car-body optimization, the frequency response sensitivity analysis is used to reduce the response displacement of the car-body structure. Based on the finite element model of the car-body，the frequency response is calculated，and the displacement response curve of driver’s seat bracket is obtained，from which the vibration peak for a given frequency is found. To reduce the vibration peak, an optimal design based on the frequency response sensitivity analysis is carried out by selecting the appropriate design parameters. After the optimization，the response displacement?at key frequencies of the car is obviously reduced，and the riding comfort of the car is improved.

Based on orthogonal experiments, sensitivity analysis of an engine’s mounting system is made to show the influence of the mounting locations on the sixth-order natural frequency and vibration decoupling rate. The mounting coordinates parameters determined by the natural frequency and main vibration coupling are analyzed and identified. The calculation shows that the change of the natural frequency and decoupling rate depends on several mounting coordinate parameters, and the coordinates of the right and back mountings play an important role. The experiment results provide a theoretical basis for the decoupling layout and robust design. This method can be employed for sensitivity analysis of discrete, non-differential or implicit-expression structures, and is of great significance for optimization design of these structures.

This paper presents the co-simulation of a semi-active suspension of a vehicle. Firstly, a multi-body dynamic model of the suspension is established by using ADAMS code. Secondly, a fuzzy controller for semi-active suspension is programmed by means of Matlab/Simulink. Finally, the co-simulation is carried out based on ADAMS and Matlab/Simulink. Simulation results show that the semi-active suspension system can improve the ride performance of the vehicle.

Acoustic-vibration coupling property of an air filter is analyzed by LMS Virtual lab in this paper. The radiation noise by the coupling effect of the filter’s case and the interior acoustic chamber is computed when the air filter is excited by the simulated engine force. Contribution of structural modes to the radiation noise is analyzed. To improve the structural property, the configuration of the air-filter’s case is optimized according to the analysis result using the Optistruct module of Hypermesh, and the optimal scheme is given.

A structural FE model for body-in-white of an SRV, an acoustic cavity BE model and an FE-BE coupled model are built. Based on the analysis of the acoustic pressure response at the field points, the peak values of acoustic pressure are found by panel contribution analysis. Based on modes modification method, the acoustic pressure is found and reduced by optimizing the velocity of the nodal point in main vibrant area.

A modal testing and analysis system of tire vibration characteristics when the tire mounts on a free state are established in this paper, with the use of vibration experiment and modal analysis method. The order of frequency and the radial modal shape are extracted, the modal parameters of tire changing with the laws of inflation pressure is analyzed, through data processing and analysis of the radial tire excitation signal. It provides guidance for the research of experimental methods , tire structure design and dynamic performance analysis of vehicle.

In order to test the reliability of electronic components of automobiles, the vibration reliability testing is necessary. The fixture, which is used to clamp and fix the electronic components, is one of the most important components in the testing. The dynamic performance of the fixture has great influence on the vibration test. According to the appearance and the location of the electronic components, a threedimensional model of the fixture was constituted. The modal frequency and vibration modal were calculated using FEM. Due to the result of analysis, the structure of the fixture was amended. And its dynamic performance can meet the testing request after the amendment.

The left front door closing sound samples at driver's left and right ears of 13 kinds of cars were collected as evaluation objects. Paired comparison method is applied for the subjective preference evaluation. Then, the characteristics of the sound samples which get high preference degree in the subjective evaluation test are studied and summarized. The main psychoacoustic parameters are calculated and the relationship between psychoacoustic parameters and subjective preference is analyzed.