Research And Optimization For Ride Comfort Of A Light Truck Based On ADAMS Virtual Simulation Technology

Car ride is refers to the car in the process of rough surface road,drivers and passengers to direct feeling of comfort,for commercial vehicles,comfort in the process of the research include transportation to ensure the integrity of the cargo capacity,good ride comfort is the guarantee of driving safety and reliability,in the process of vehicle design and development,design research is very important for ride.This paper takes commercial vehicle as the object,USES multi-body dynamics theory and MSCAdams virtual prototyping technology to build multi-body dynamics model for each subsystem of light truck.By establishing flexible elements for the cab and seat,the effect of different parameters on ride comfort is studied.According to the relevant provisions of the driving smoothness test in the national standard,the pulse road surface and random road surface models were built in the Adams road surface generator.According to the test method in the national standard,the multi-body model was uniformly passed through the road surface model at different speeds,and the simulation analysis of the whole vehicle random road surface and pulse road surface was carried out.Combined with the national standard and the actual model,the evaluation of smoothness does not consider the seat surface and the back,and the simulation analysis under the pulse road surface,the maximum vertical acceleration at the seat support surface and the maximum vertical acceleration at the center of the box as the evaluation index;For the simulation analysis under the random pavement,the root mean square value of three-way weighted acceleration at the seat support surface is used as the evaluation index.The vehicle smoothness was optimized and analyzed by using the multi-objective optimization theory,and the DOE function in Adams/insight module was used for the multi-objective optimization.The stiffness and damping of the rear suspension were used as the design variables for this optimization,and the evaluation index of smoothness was used as the optimization objective.The optimal stiffness and damping combination obtained from the optimization was reassembled into the vehicle model,and the smoothness simulation analysis under the same condition was carried out.By comparing the performance parameter curves before and after the optimization,the optimization scheme was objectively evaluated to complete the vehicle smoothness optimization.