Dynamic and Control Analysis of Semi-Active Suspension System

Vehicles handling and ride comfort are essential subject because these vehicles operate at different environments. Improving the comfortability enables the drivers to derive for a long time at critical situations with full activity. This work deals with dynamics and control policies analysis of semi-active suspension systems for off-road vehicles. Comprehensive comparison on three different configurations; 2-axle, 3-axle and 4-axle half-vehicle models were conducted to analyze the effect of using semi-active control policies. The application of several control policies of semi-active suspension system, namely skyhook; ground-hook and hybrid controls have been analyzed and compared with passive systems. Sprung mass acceleration, suspension deflection and tyre deflection responses were analyzed for measurements of ride quality and road handling. Analysis in frequency domain transfer function, time domain transient state and time domain steady state were conducted on each of the models.