Search Results

Finite element aodels have been developed to analyze drive line and suspension vibration. For the analysis of booming noise, we have addressed the optimization of the differential gear carrier mounting system by using a virtual system and realization of it considering many constraints. To reduce the differential whine noise, a simulation method considering the transmitting error of the differential gear was applied. And we have approached for the subtle arrangements of many structural resonances with detail research of the drive line and suspension. For the reduction of road noise, we adopted the approach of shifting the node of the rear suspension member mode.

This paper describes a method to arrive at a feasible solution which can not be found in the linearly approximated constrained domain and a process which would reduce the number of finite element analyses to obtain a designer's preferable solution. The feasible solution is obtained by adapting the goal programming method, in which the weighting factors depending on maximum allowable performance variables and performance sensitivities are used. The designer's preferable solution is obtained by presenting the linear approximated trade-off curves after taking into account the designer's rough preference. Two applications of optimization for compliances of a passenger car rear suspension system are described, in which spring stiffness and installation angles of insulators are treated as the design variables.

This paper describes a three-dimensional crash simulation program code-named ‘CRASH’ and its evaluation. This program predicts body deformation behavior of an automotive vehicle in a crash. In the program the body is represented by a structure consisting of beam elements. The inelastic deformation is calculated with the simplified constitutive equation using the yielding function. Reduced load carrying capacities due to local deformations are considered by means of representative static load-deformation curves obtained by experiments. Deformation behavior of the structural members with the above properties are analyzed with direct integration scheme taking the strain rate effects into consideration. Large displacements of structural members are also accurately calculated with the coordinate transformation matrices taking account of the finite rotations.