供气压力对气体轴承-转子系统稳定性影响的实验研究

摘要

In order to overcome the problem that the aerostatic bearing-rotor system vibrates severely near the critical speed region,a large number of experimental studies about the effects of supply pressure on stability of high-speed aerostatic bearing-rotor system were carried out.In this paper,with turbine driven and the control of the electrical proportional valve,vibration of this system was tested and analyzed on various working conditions.The results demonstrate that the critical speed is increased with the increase of the bearing supply pressure.However,the change of the vibration amplitude is opposite,which is reduced with the increase of the bearing supply pressure.The method of secondary controlling the supply pressure can sufficiently inhibit the vibration amplitude of the critical speed region within a certain range,and the system stability can be corresponding improved.%为解决气浮轴承在经过临界转速的剧烈振动不稳定这一问题,进行了供气压力对气体轴承-转子系统稳定性影响的实验研究.基于涡轮驱动和电器比例阀压力控制,搭建了基于高速静压气体轴承-转子系统实验台,对不同供气压力工况组合下系统振动进行了测试与分析.结果表明:在一定供气压力范围内,临界转速值随着轴承供气压力增大而升高,振动幅值随着轴承供气压力增大而降低,合理控制临界转速区域附近供气压力可一定程度内抑制振动幅值,达到提高系统稳定性的目的.