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针对在气缸偏摆状态下的气流力识别问题,引入转子动力学双平面平衡理论,将多级密封内的气流力等效到两个端面上,建立多级密封气流力等效试验识别模型。通过气缸共振的方法放大气流力影响,提高识别精度。通过更换不同刚度的弹簧来实现多转速下的试验。在密封试验台上开展了进气压力、振动、转速等因素对气流力的影响。试验结果表明,随着进气压力增加,气流力增大,两者间近似为线性关系。升速过程中气流力的变化主要还是由于振动变化所引起。随着振动的增加,气流力增大。气流力所作功量与气流力和振动之间的相位角差关系较大。相位差为90°时,作功量最大。
Aiming at the problem of air flow force identification in the case of cylinder deflection, the theory of double-plane equilibrium of rotor dynamics is introduced, and the air flow force in multi-stage seal is equivalent to two end faces. The equivalent test identification model of multi-stage seal air flow force is established. Through the method of cylinder resonance to amplify the impact of airflow, improve the recognition accuracy. By changing the different stiffness of the spring to achieve multi-speed test. In the sealed test bench to carry out the intake pressure, vibration, speed and other factors on the air flow. The experimental results show that the air flow force increases with the increase of intake pressure, and the linear relationship between them is approximately. The change of air flow force in the process of increasing speed is mainly caused by the change of vibration. As the vibration increases, the air flow increases. The amount of work done by airflow is strongly related to the phase angle difference between airflow and vibration. When the phase difference is 90 °, the maximum amount of work done.