Vertical Vibrations of the Vehicle Excited by Ride Test

A mechanical equivalent model has been developed to characterize the response of the vehicle excited by road profiles. The mechanical equivalent model offers an estimation of accelerations of vehicle along vertical axis in terms of natural frequencies and dissipative properties of vehicle. The mathematical model considers the differential equations governing the forced vibrations of the MIMO system model (order 4, with two inputs and two outputs) of suspension system. The response of suspension system is evaluated by convolution integral solution for system with general damping. In order to calibrate the mathematical model, an experimental design is developed by the ride test. This test provokes the impact between a vehicle and a rectangular-shaped cleat bar on a road. The least square error evaluates the good agreement between accelerations obtained by mathematical model and ones deduced by experimental investigations.