Research And Development Of Multi-objective Optimization System For Air Suspension System Of Heavy Truck

The performance of suspension determines the ride comfort and handling stability of the car directly.Because of its unique excellent properties,the air suspension system has gradually entered the field of motor vehicles.It is reported that,air suspension system has been widely used in heavy trucks abroad.The vehicles with air suspension have an ideal natural frequency,a good ride comfort and a satisfactory handling stability.Thus the air suspension has a good prospect for development.In this paper,a 1/2 simplified model of a heavy-duty truck was set up,with the help of Matlab/Simulink,a simulation model for ride comfort was completed, According to the vibration curve of acceleration obtained in the simulation for a heavy truck with air suspension,the main factors effected the ride comfort of trucks was analyzed,it provided the basis for the set up of regression equation and objective functions in optimization follow-up.The indicators of suspension performance evaluation are acceleration, suspension dynamic deflection and suspension dynamic load,they are often conflicting with each other in the course of suspension design.In order to get a better suspension performance,a multi-objective optimization method with interactive satisfying trade-off was applied in the design of heavy trucks with air suspension.Through the optimization of suspension under the no-load,part load and full load conditions,the curves of stiffness-load and stiffness-displacement can be obtained as the theoretical basis for the design of air spring.Such a multi-objective optimization system for air suspension system of heavy trucks can help the designers in the prediction of the performance of the suspension, it can shorten the development cycle and reduce the development costs.