Study On Semi-active Suspension Characteristics Of Commercial Vehicle Seat

Commercial vehicle due to its capacity and structural requirements, most commercialvehicle chassis suspension stiffness are particularly large, and because of the commercialvehicle often working in harsh environment, so the uneven pavement can produce strongvibration in the cab. If the vibration commercial vehicle driver’s long time exposure tocertain intensity, will easily feel fatigue, affects the working efficiency and the accuracy ofoperation, serious word will also affect the physical health. In order to reduce the vibrationtransmission to the driver body, generally through the vibration of seat suspension vibrationisolation system and by improving the commercial vehicle seat can significantly improve thecomfort of also almost does not affect other properties. But the suspension of traditionalpassive seat suspension system stiffness and damping in seat design end is fixed, cannot bechanged according to the seat vibration situation of demand, when the commercial vehicleruns on the expressway as well as on the road, so the suspension should be soft, but when thecommercial vehicle driving in the mines of bad road in order to ensure the seat suspension,not hit the limit, for seat suspension is hard is appropriate, passive seat cannot meet the samecomfort effect requirements for different driving conditions. While the semi-active seatsuspension system damping variable can meet this requirement very well. Vibration dampingsystem through the sensor seat mounted on the seat on different roads, and then through thecontrol strategy of certain control semi active damper to produce the most suitable dampingaccording to the vibration state seat, ensure commercial vehicles in different conditions, theseat can keep the best comfort. So it has very important practical significance to studycommercial vehicle seat semi-active suspension in this paper. In order to obtain the most suitable control strategy and control parameters forcommercial vehicle seat semi-active suspension, the calculation and simulation of thecommercial vehicle seat multi body dynamics modeling, commercial vehicle seatsemi-active suspension control method research and the seat bench test are lunchingcombined with the commercial vehicle seat suspension development program.Multi-body dynamics modeling and simulation analysis on commercial vehicle seatsuspension. To study seat features and control methods are based an accurate seat model.In this paper, scissor seat suspension multi-body dynamic model is built based on thespecific structure and constraints of the seat. And to build the model not only takes intoaccount the actual install location of shock absorbers and springs and the angle changes inthe vibration process, but also considers the mass and inertia of each of the components ofthe scissor seat. Then the established model is validated based on the designed bench tests,furthermore, the multi-body suspension model is simplified based on the simulation resultsof scissors multi-body suspension dynamics model.Research on control method of commercial vehicle semi-active seat suspension. Inthis paper, the LQG controller is designed according to the optimal control theory. Thedesign progress is based on the seat simplified model. And the acceleration dampingcontroller is designed according to the acceleration damping control theory. The designprogress is based on the seat multi-body dynamics model. Then the simulation results oftwo controllers were compared to analyze the advantages and disadvantages of the twocontrollers and clarify the reason actual acceleration damping controller is more suitable forthe seat suspension control.The seat bench test. To analyze the bench test result of the passive seat and thesemi-active seat installing semi-active damper controlled by acceleration damping control toverify the effect of acceleration damping control algorithm.