Influence of compliance for an elastokinematic model of a proposed rear suspension

Abstract

ABSTRACT−The research is carried out to improve passenger's comfort to increase the vehicles stability in dynamic conditions. The literature available in the automotive engineering considers different topics for studying suspensions. An example represents mechanisms structure and analysis (synthesis, kinematics, and dynamics) under various operating conditions. These aspects have been approached before analytically, numerical. The current paper studies the influence of the lateral force on the contact patch of the wheel and the corresponding variations of vehicle stability parameters, such as camber angle and wheel rear track. The study is performed for a newer innovative rear suspensions mechanism which does not have a wheel track and camber angle variation, relative to the chassis, when the suspension components was considered rigid. A numerical solution is obtained through a virtual model on several commercial codes: MSC Adams, Patran, Nastran. Concerning the analysed parametes, their variation increases as the applied force is increased. Moreover, the largest variation corresponds to the case were elastic bushings and deformable links are considered.

Method for the Kinematic Analysis of the Vehicle Axle Guiding Mechanisms

“…The guiding links of the axle suspension mechanisms are connected to the adjacent parts (axle and car body) by compliant joints (bushings). For the kinematic analysis, where the force generating elements (as the bushings actually are) are not taken into account, the bushings are modeled as spherical joints, thus neglecting the linear (axial and radial) deformations [21]- [24]. A comprehensive structural systematization of the axle guiding mechanisms based on spherical joint assumption was presented in [21], according to the number of degrees of mobility (DOM=1 or DOM=2, by case), which can be determined by the Gruebler's count [25], [26]:…”

“…In equations (23)(24)(25), the coefficients A1,2,3, B1,2,3 and C3 depend on the global coordinates of the known reporting points (M1,2,3) and the corresponding distances (d1,2,3):…”

Dynamic modeling and simulation of trailer with compliance steering system

“…The main parameters affecting the handling stability of the trailer in the CS system are [12,13],  The stiffness of the CS system ks,  the lengths of the front and rear arm c2 and d2, damping coefficient Cc or damping ratio ,  the speed of the vehicle u.…”

Method for the quasi-static analysis of beam axle suspension systems used for road vehicles

“…The study of the influence of these deformations on the kinematic and dynamic behaviour of the suspension system is a key subject in beam axle design. 4–11 Another important issue in the field is the accurate identification of the geometric parameters in suspension elastokinematic models. The deviations due to the elastic deformations of the bushings in a pseudo-MacPherson suspension system are approached in Meissonnier et al, 12 in which a comprehensive method based on homogeneous coordinates and operators was developed for determining the precise position and orientation of joints.…”