Abstract
This paper analyzes the impact of flexibility of individual supporting elements of independent suspension on its elasto-kinematic characteristics. The toe and camber angle are the geometric parameters of the suspension, which waveforms and their changes under the action of vertical, longitudinal and transverse forces affect the stability of the vehicle. To study these dependencies, the computational multibody system (MBS) model of axle suspension in the system HyperWorks is created. There are implemented Finite-Element-Method (FEM) models reflecting the flexibility of the main supporting elements. These are subframe, the longitudinal arms, transverse arms and knuckle. Flexible models are developed using Component Mode Synthesis (CMS) by Craig-Bampton. The model further comprises force elements, such as helical springs, shock absorbers with a stop of the wheel and the anti-roll bar. Rubber-metal bushings are modeled flexibly, using nonlinear deformation characteristics. Simulation results are validated by experimental measurements of geometric parameters of real suspension.
Highlights
Nowadays, vehicles are equipped with powerful power units and achieve very high speeds
Publication [3] deals with the creating of the multibody system (MBS) computational model of the whole vehicle using non-linear FEM model of the tire, which is used for simulations and research of vehicle behavior on rough road surfaces
It is evident that the flexibility of supporting elements in MBS models (Elast+Flex) strongly affects the value and shape of the toe angle δ = f (Dz) and vary from the model with rigid elements (Elast+Rigid)
Summary
Vehicles are equipped with powerful power units and achieve very high speeds. It is important to study passive safety (reducing the consequences of road traffic accidents), but mainly active safety, which aims to prevent traffic accidents. This technical discipline is closely related to the vehicle dynamics. The term elasto-kinematic characteristics of the suspension is defined as the change of geometrical parameters of the suspension (toe angle, camber angle) due to the action of the wheel load in vertical, longitudinal and transverse direction of the vehicle. Sensitivity analysis of elasto-kinematic and dynamic properties on the deformation characteristics of bushings and supporting elements for independent suspension McPherson is shown in [9].
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