Acording to the oil temperature influenced on the seal reliability, this paper put forward to the importance to study the temperature rise of the damping device. The thermodynamics of physical model of oil gas spring under the forced convection condition was established. The heat transfer coefficient expression of the correlation surface and the comprehensive heat transfer equation were deduced. After that, the external force and internal energy change rate of oil and nitrogen were researched. Through the principle of conservation of energy and the real gas state equation, the oil gas spring thermodynamic mathematical model was created. In the end, the external influence factors on the oil temperature rise were analyzed, the conclusion could be used as a reference for the design of damping device.
The diagrams of damping valve with annular slice and hydro-pneumatic spring are given. According to the calculation method of the sectional linear speed characteristic, the damping coefficients and the resistance values at the valve open point and the maximal valve open point are deduced. Based on the principles of sheet deformation and aperture throttle, the function relation between flow and pressure difference in turbulent state is researched before and after the damping valve is open. After that, the system elastic force value is deduced by using equation of state of real gas. The correctness of the design method is validated by means of the comparison between performance test and simulation data. Eventually, the influence rules of different parameters of damping valve on the speed characteristic of hydro-pneumatic spring are analyzed so as to provide reference to the research on the internal characteristic of damping equipment.
The paper put forward to research the mathematical model of double wishbone independent suspension. First,the nonlinear elastic performance of oil gas spring was deduced through real gas state equation. After that, Kinematics principle of double wishbone independent suspension was researched, it was help for understanding how to design the guide mechanism of suspension. In the end,the external influence factors on suspension were analyzed, the conclusion could be used as a reference for design of the device.
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