Study On Optimization Design Of Heavy Truck Cab Suspension Parameters

In this paper,based on mechanics of vibration,random vibration theory and the multi-body dynamics,a cab full floating type heavy duty commercial vehicle,developed by Jiang Huai Automobile Corp,was studied by means of the lumped mass method,ADAMS software respectively,to build cab suspension system and vehicle virtual prototype model.Through the simulation analysis,the effects of cab suspension system parameters on the cab ride comfort were studied,and the cab suspension system of main parameters was optimized.Then the real vehicle road test verified these schemes,and the research results provide guidance and advice for enterprise product development and the future development of similar models.The main research contents of the thesis are as follows:Firstly,the lumped mass method and elastic bending vibration theory method were employed to establish the 15 DOFs vehicle vibration model,and the Matlab software programming was used for the cab ride comfort simulation.The effects of a variety of cab suspension parameters on heavy vehicle ride comfort were heavily discussed.Then,based on ADAMS software,the full-floating suspension virtual prototype vehicle cab was established,and the corresponding module for pulse road excitation,random road excitation and 30-100km/h speed on the driver’s seat vibration acceleration were simulated,the calculation results show that: the total weighted acceleration root-mean-square value belongs to uncomfortable levels for the subjective feeling,and it is necessary to optimize the cab front and rear suspension parameters.Then,based on the vibration energy decoupling theory and simplex algorithm,the full floating suspension system parameters of the cab were optimized.Through the reasonable selection of full floating suspension stiffness,damping,and optimization of each order of cab assembly suspension system modal parameter,we can reduce and isolate the Powertrain vibration and road excitation vibration through the frame pass to the cab vibration,and improve the ride comfort.Then,according to the full float cab suspension parameter optimization results,the air sac diameter and stiffness were designed,and the cab coupled dynamic model for air springs were established.The simulation and computation were carried out.Then,by using full-load test method,the full float cab prototype vehicle vibration comfort tests were carried out.These experimental results provide a solid basis for verifying the theoretical calculation results and cab mounting optimization design.Lastly,the above research results have been applied to a certain type of full floating air sac suspension in Jiang Huai Automobile Corp’s heavy truck,and a higher ride comfort evaluation is received.