IJEART

A 3DOF(three-degree of freedom) half-vehicle suspension model with time-delay feedback control is established to study vehicle vibration performance in idle condition. When running in idle condition, the vehicles don’t have speeds and road excitation, so engine vertical self-vibration is the only excitation source. Utilizing Routh-Hurwitz criterion and a new frequency scanning method to analyze the stability of the suspension system. Introduced by the damping mechanism of time-delay dynamic vibration absorber and the system amplitude frequency characteristic, establishing the unified-object function based on the body displacement and pitch movement. By using Matlab Optimization Toolbox, designed the best time-delay feedback coefficient and time-delay value of suspension system, and the simulation is conducted in both time and frequency domain. Simulation results show the RMS(root-mean square) of vehicle body displacement and pitching motion with time-delay feedback control is respectively reduced 65.1% and 61.1% under the engine simple harmonic excitation. In conclusion, the vibration control with time-delay can effectively improve engine vibration isolation and vehicle working performance in idle condition, which provides a theoretical basis and reference for simulation analysis and optimal design of the vehicle vibration system in idle condition.