The Analysis And Improvement Of The Engineering Vehicle Seat

Traditional Engineering Vehicles were emphasized on the completion of the task whilepay less attentions on the driver. Recently, with the development of science and technology,during the routine work, people are increasingly laying stress on the health and comfort. Takethe traditional agricultural machine for example, it has no seat for the tiller, people realizedthat one person chasing behind a machine is a tiring work. During the following engineeringmachines, the seat for the driver appears. However, the primary seats are rigid ones, leaving aspace for the worker and paying less attention to the comfort of the driver. The research andfact show that the rigid seat hardly absorbs vibration, sometimes, it would amplify theshaking. To gain good quality of comfort of seat, some laws were implemented to supervisethe seat or vehicle manufacturers to produce seat in good quality. For example, GBT14779-1997was issued to constraint the sitting posture of the seat. For the manufacturers, itis essential to highlight the comfort of the seats, for the purpose of producing good productsaccording with the factory standard, the local standard and the national standard. The thesiswill do some analysis and researches as follows.Firstly, a kind of seat suspension is designed, which is to absorb the vibration of thevehicle. The seat suspension is designed by the three demensional soft of CATIA. In the paper,the CATIA is made some introduction to the reader, then the three demension view of the seatsuspension and the engineering view are made. Also, the stiffness of the spring has beendesigned and the damper has been made of some experiment.Secondly, in this paper, the factors which have influence on the comfotable of thedriver. Except the influence of the vehicle itself, the driver’s comfotable is influenced by thevehicle speed and the road roughness. The road condition is usually expressed by thefrequency-domain model, whie what the vehicle needs is usually the time-domain model. Sothe frequency-domain model should be changed into the time-domain model, and theroad-roughness is gained. The vehiche velocity and road-roughness ratio are made to be theinput parameters in analysising the vehicle comfortable which with seat suspension andwhich without. By researching them, they can act as theory for the existance of the seatsuspension.Finally, the parameters of the seat suspension are simulated. To illustrate the reasonable of the spring and damper parameters, the upper acceleration of the seat panel is measured.Being different weight of different drivers, the related parameters of spring and damper areused. By researching this, it can help to ground the theory of selecting the value of the springand damper and instruct the practice.