Ride Comfort Analysis Using Quarter Car Model

Document Type : Original Article

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Egyptian Armed Forces, Egypt.

Abstract

This paper presents a detailed theoretical and experimental investigation for ride comfort evaluation at different vehicle speeds. For the purpose of ride comfort evaluation, a quarter car model with two degrees of freedom has been developed. For realistic investigation, the equivalent characteristics of suspension stiffness and the shock absorber characteristics are calculated and incorporated to simulation. Using available quarter car test rig for single independent front suspension, that embodies sprung mass, unsprung mass, suspension system and tire. An excitation of sinusoidal road profiles with constant amplitude is imposed via eccentric wheel that represents the road profiles. The experimental results of sprung mass and unsprung mass accelerations due to road excitation are measured, recorded and processed. A validation of the theoretical results with experimental results has been carried out at different speeds. Good agreement has been obtained when using the equivalent suspension stiffness and damping coefficient as input parameters to quarter car model
representing the independent front suspension.

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