Abstract
In this study, the dynamic interaction between road and vehicle is modeled. For this purpose, a full vehicle model with eight degrees of freedom is considered. The equations of motion of the whole system are derived by the D’Alambert method and numerical solutions are obtained by the Newmark average acceleration method. Due to varying road roughness, the forces affecting the driver and the vehicle-components are analyzed in detail. Also, vertical and rotational displacements, velocities, and accelerations are examined, and results graphs are given. Two different pre-defined road profiles, created as non-random road excitation, and five different vehicle speeds are presented and analyzed.
Highlights
Vehicle dynamics and forces affecting vehicle components and driving comfort with increasing vehicle speed are an emerging research topic
The effects of speed bumps, on the dynamics of the vehicle were examined for five different vehicle speeds and two road profiles
Passenger seat vertical displacement and car body vertical, pitch, and roll displacements are shown in Figure 4, for five different vehicle velocities
Summary
Vehicle dynamics and forces affecting vehicle components and driving comfort with increasing vehicle speed are an emerging research topic. Many vehicle models have been proposed to examine vehicle-road interaction. These models can be classified in three types, quarter-car, half-car, and full-car modeling. By using speed bump as road disturbance, overshoot and settling time with passive suspension system were analyzed in [2] for a quarter-car model with 2 degrees of freedom. A robust quarter-car control scheme was created in [4] along with a road disturbance profile with a sliding mode controller. According to the variable damping coefficient limit, semi-active suspension systems were created in Matlab/Simulink in [5] and system’s damping coefficient limit of 4000Ns/m performed best when considering ride comfort. An active suspension system which used sliding mode control was created and compared with the passive suspension system in [9]. The results show that this system has better effect on vibration isolation compared to the passive suspension system
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