Abstract
The purpose of this paper is to study the ride vibration in particular the effect of including a flexible car body that is represented in CMS method. This paper presents a full vehicle simulation on passing a small bump by using ADAMS and MSC/NASTRAN with the target frequency below 80 or 100Hz for ride analysis.
From the comparison of the rigid and flexible body models it has been found that time domain oscillation just after an impact shock is seriously influenced by elastic characteristics of car body stiffness. The car body stiffness strongly affects the accelerations on car body. Therefore, it is critical that car body stiffness effects are taken into account in the simulating a car.
Car body stiffness is mainly classified into global stiffness (bending and torsion) and local mounting stiffness. The stiffness effects are discussed by modifying global bending stiffness and local shock tower mounting part in point of ride. The parametric study shows that the stiffer the car body is both in global stiffness and local mounting stiffness, the lower vibration is transmitted to car body, however, the adequate stiffness criterion could be guided from this study.