Because of the large and complex structure of the metro car-body, its local modification will lead to a large number of rework in finite element modeling and analysis. Taking into account the modular manufacturing characteristics of the aluminum-alloy metro car-body, modal analysis of this model was performed based on the dynamic substructure method. Results of computation were compared with those from the conventional finite element method. It is shown that the finite element model can be quickly established and the accuracy of the solution can also be guaranteed with the use of dynamic substructure method.

The influence of track irregularity on vehicle body’s lateral vibration is studied, and the performance of vehicle body’s vibration is evaluated. At first, a simplified urban vehicle’s model is established. Then the track irregularity is described and the track power spectrum in space domain is transferred into the spectrum in time-frequency domain. The 3D model of the vehicle’s body is established with PROE software, and then the wheel-rail model and the train’s simulation model are established with the use of the dynamic simulation software SIMPACK. Finally, with the height irregularity as excitation function, the lateral vibration response of the vehicle’s body is computed. Referring to the domestic standard of lateral stability, the lateral performance of vehicle’s body is evaluated.

The finite element model of a vehicle body was established based on a kind of vehicle at first, and the computational modal analysis was conducted. Computed results was compared with experimental ones, the validity of the finite element mode was verified. Based on the results of modal analysis, the improving method of the vehicle body’s vibration and noise control was given out. Then the vehicle structure was improved on the model and the vehicle interior noise of the improved vehicle structure was computed. The result indicated that the improving method could control the interior low frequency noise of the vehicle.

The three dimensional model of a threecylinder diesel engine block is established by using UG 5.0 software, and the modal analysis of the engine block is carried out under four different constraint conditions using Lanczos method. Through the analysis, the inherent frequencies and the modal shapes of the first 10 order modes are obtained. The results are compared one another. Based on the comparisons, it is discovered that the inherent frequencies and the corresponding vibration modes are quite different for different constraint conditions. In addition, the weak portions of the engine block vibration are found by modal analysis, and the corresponding modifications are put forward, which may provide a reference for further structural design and dynamic response analysis of the diesel engine block.

A commercial vehicle is chosen for study. The interior noise is tested based on national standards. According to the results, the distribution and the spectrum characteristics of the interior noise are analyzed.

The drum of a washing machine rotates at a high speed during dehydration work, while the clothes in the drum rotate together with the drum, yielding pressure on the drum wall which causes the drum to deform. With software Pro-E and ANSYS the finite element model of a washing machine drum with its support is established. Dynamic analysis of the drum structure in the case of dehydration work is carried out. The natural frequencies and vibration modes are obtained. The critical positions and the critical rotating speed are found. Some improvement suggestions for the washing machine drums are esented.