Research On Vibration Characteristic Of Scissors Linkage Seat With Suspension Of The Air Spring With Auxiliary Chamber

Researches show that vibration has a great extent influence on the health of the human body. As to driver, which commonly work and run in worse environment, bears taking vibration of high strength and low frequency for a long time, its lumbar vertebrae, backbone, thorax and viscera will all be caused and injured, the physical and mental health of the serious injury driver, reduce working efficiency. In this study, air spring with auxiliary chamber suspension was added to a scissors linkage seat to establish the new kind of driver's seat suspension for improving work and run environment. The theory model of system was set up. Through simulation and experimental, its vibration characteristic was studies, the achieved results is as follows:Firstly, two kind of the layout mode of the air spring in the scissors linkage seat suspension was analyzed (including air spring was put among top plate and bottom and air spring was put among scissors linkage and bottom plate) and then the differential equation of the seat suspension with air spring were established, natural frequency of vibration and damping ratio of vibration system was leaded out. Results show vibration systematic natural frequency depends on air rigidity of spring, equivalent sprung mass and structural parameter of seat. Take HY-Z04 type scissors linkage seat as an example, natural frequency of tow kind of layout mode was calculated, it analyze obtain the natural frequency when air spring was put among scissors linkage and bottom plate was 0.57 times that of when air spring was put among top plate and bottom.Then, the simulation model of the scissors linkage seat with air suspension was established by ADAMS, the vibration characteristic of suspension system of the seat was analyzed. The researches show: under the same inner pressure, the dynamic amplification factor decrease with equivalent sprung mass increasing. when the excitation frequency is low, the acceleration root of mean squares isn't related to equivalent sprung mass; when the excitation frequency is high, the acceleration increase with the equivalent sprung mass decreasing. Comparison with the excitation, displacement and acceleration of responding was all later than excitation about 1/8 periods,Based on the result of simulation, the experimental system of air spring suspension with auxiliary chamber of seat was established, the dynamic characteristic of suspension system of the seat was systematic researched. The researches show: while the orifice was closedown, comparison with the excitation, displacement and acceleration of responding was all later than excitation about 1/4 periods, later than simulation result about 1/8 periods. Under the same inner pressure and excitation magnitude, the peak value frequency of the dynamic amplification factor decrease, with equivalent sprung mass increasing, but the peak value of the dynamic amplification factor increase, with equivalent sprung mass increasing. Under the same equivalent sprung mass, different excitation magnitude, the peak value of the dynamic amplification factor increase with excitation magnitude increasing. When the excitation frequency is low, the acceleration root of mean squares increase with excitation magnitude increasing, when the excitation frequency is high, the acceleration root of mean squares keep intact or slightly drop. With the orifice from close to open, peak value frequency of the dynamic amplification factor decrease. The dynamic amplification factor and the acceleration root of mean squares of system decrease, when the orifice was opening, but almost didn't change with the orifice changing above 45°. Comprise with HY-Z04 seat suspension, the resonance frequency of air spring suspension with auxiliary chamber is lower about 0.5Hz; when crossing resonance frequency, under the same excitement frequency, dynamic amplification factor of air spring suspension with auxiliary chamber is smaller about 0.3-0.4 than HY-Z04 seat suspension, the acceleration root of mean squares of air spring suspension with auxiliary chamber is far lower than HY-Z04 seat suspension, about half of it.The study could be reference and guide for the research of the driver's scissor linkage seat with suspension of the air spring with auxiliary chamber.