This study provides basic information on the analysis and optimization of vehicle suspension systems with a damped absorber attached to the sprung mass and the un sprung mass. This study is also concerned with comparing these systems with a optimized conventional system. A two degree of freedom linear model subjected to guideway irregularity, described as a hyperbolic displacement spectral density, random excitation is chosen for studying the system. Dimensionless space and design parameters are selected to allow for adequate generality. The objective function incorporates the tire-terrain normal force, as an indication of the vehicle controllability, constrained by the sprung mass acceleration as a comfort criteria. Optimum parameter synthesis of damped absorber suspension with the damped absorber attached to sprung and unsprung mass, as well as a conventional suspension system has been obtained. Performance characteristics for the optimum damped absorber suspension and the conventional suspension are presented. The comparison among the optimised conventional, and the optimized damped absorber suspension systems show that the optimum damped absorber suspension with the absorber attached to the unsprung mass, based on the objective function chosen, is the best.
Library of Congress Subject Headings
Motor vehicles--Springs and suspension; Motor vehicles--Dynamics; Vibration
Department, Program, or Center
Mechanical Engineering (KGCOE)
Cheema, Rifaquat Ali, "Optimization of vehicle suspensions subjected to random excitation" (1984). Thesis. Rochester Institute of Technology. Accessed from
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