SIMULATING A VEHICLE SUSPENSION SYSTEM BASED ON A SHOCK ABSORBER OF REGENERATIVE ACTION

The paper describes the structure of a vehicle suspension system with the recovery of the mechanical energy of sprung mass vibrations into electrical energy. The system consists of a set of shock absorbers with a recuperative action, power converters and a control unit for recharging the energy storage in the form of a battery. The shock absorber has a synchronous electric machine excited from permanent magnets and a converting mechanism in the form of a ballscrew. The authors present mathematical model of the vehicle suspension system based on a shock absorber of recuperative action. With the help of a mathematical model, it is possible to determine the power, which can be recuperated by the vehicle suspension system when driving on roads of variable quality (aspalt and dirt) at different speeds. It has been found that when a truck moves at a speed of 40...50 km/h along an asphalt concrete road, the average recoverable power of the system amounts to 0.011 kW, and when driving along dirt roads it is 0.206 kW. When driving on a flat asphalt road, the efficiency amounts to 0.02...0.03% and is comparable to the energy costs of the control system. When a truck was moving along a dirt road, the average efficiency was about 1% or 1.2621 kWh/100 km. The authors claim that the offered mathematical model allows to reduce the total research test cost of the shock absorber of regenerative action.