The Analysis Of Occupant-Seat-Vehicle System’s Response To Vibration

Vehicle ride comfort plays an important role in the vehicle selection and customer satisfaction. It depends upon various factors including road irregularities, vehicle suspension, tires, seat design and human body’s properties itself. Vehicle design is a special example of product design process which takes multiple iterations. It is essential to reduce the total number of iterations in the early design stage to save time and money.Based on the virtual prototype technology, simulation human body response to whole body vibration and optimizing seat dynamic parameters has the ability to provide ideas for seat’s forward design, shorten design cycle, and improve the development efficiency.The main purpose of this research is to analysis human body response to whole body vibration based on the absorbed power, and optimize the seat dynamic parameters. Firstly air-spring model is developed besed on ideal gas assumption and heat transfer taking place between the spring and its surroundings, and the stiffness curve of air-spring is calculated for modeling the seats suspension system in ADAMS. Secondly, based on the road power spectrum, the stochastic road model is estabilished in ADAMS by using the wave superposition method and the inverse Fourier transform method. Thirdly, the occupant-seat model with 23-DOF is constructed, and coupled with vehicle model to form the occupant-seat-vehicle system. The human body respose caused by stochastic road excitation based on the absorbed power is simulated with this model. The simulation results indicate that the interaction between feet and ground exerts non-negligible effect upon the performance of the whole body vibration. Lastly, based on Genetic Algorithm,the optimization of seat dynamic parameters is constructed to minimize the weighted absorbed power.