环 面 与 锥 腔 结 构 静 压 气 体 静 平 衡 装 置特 性 仿 真 与 试 验

Taking the aerostatic static balancing device as the research object,the bearing capacity,flow rate,static stiffness of the aerostatic static balancing device under different structural parameters,as well as the changes of pressure and velocity in the fluid domain,and based on the dynamic grid technology,the effects of different incentives on the dynamic stiffness and damping of the aerostatic static balancing device with orifice restrictor were studied,and the static characteristics of the aerostatic static balancing device with orifice restrictor were tested. The results show that when the angle of the tapered chamber is 40°,the static characteristics are better. When the diameter of the orifice restrictor is 0.3 mm and the diameter of the bottom circle of the tapered chamber is 0.8 mm,the static characteristics increase the most. There is a supersonic flow and a large pressure fluctuation in the orifice outlet area,and a symmetrical vortex with opposite flow direction exists in the tapered chamber,which affects the static balance accuracy. The dynamic stiffness of the static balancing device increases linearly and the damping decreases with the increase of gas supply pressure. The greater the excitation amplitude,the greater the dynamic stiffness and damping. With the increase of excitation frequency,the dynamic stiffness increases and the damping first increases and then decreases. The static test results are in agreement with the simulation results,which verifies the accuracy of the calculation method and the feasibility of the static balancing device.