Mathematical modeling and simulation analysis of stepped torsion bar spring for light motor vehicle suspension

Abstract

In the present world scenario, the automobile industries and educational institutions have developed excellent research and development laboratories with intelligent feedback control systems. These developments is carried out to analyze the performance of vehicle suspension and to isolate the vibration and stability of vehicle for the various road inputs such as road humps and irregularity of road surfaces. The designed suspension systems are carefully tested in modern laboratories and simulated with the help of various simulation software s. Now a day s people are looking for comfortable riding in automobiles against the road conditions (vibration) with less cost. The road surface is the important input parameter which affects the ride quality and stability of the vehicle. In on-road running condition, the normal loads are due to irregularities in road surface like pot holes, uneven waviness and impulse loads are due to road humps. In the off-road running condition, the combined form of normal load and impulse load are produced due to surface undulation and obstacles present on the road surfaces. In such cases, the vibration isolation and road holding of vehicle should be ensured for comfort riding. The ride quality always depends on the suspension parameters. The semi-active control suspension and active control suspension ensures better ride quality based on feedback control law. In the absence of feedback control law, it is very difficult to absorb normal load and impulse load. In such cases, a less stiffness spring and high stiffness springs are used. The less stiffness springs provides good ride comfort and less road holdings. The high stiffness springs provides less ride comfort and high road holdings. newline