中文摘要：

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。

英文摘要：

To consider seal force test problem under the influence of cylinder complex vibration condition, the paper set up an equivalent identification model for multiple seal based on double plane balance theory of rotor dynamics. Seal force was equivalent to two end plane of the cylinder. Cylinder resonance was used to enlarge the influence of seal force and to enhance test accuracy. Test under multiple rotating speeds was realized by changing spring stiffness. Influence of rotating speed, inlet pressure, vibration on seal force was tested in the rig. Results show that seal force increases almost linearly with inlet pressure. Change of seal force during run up process is mainly caused by the change of vibration. The seal force increases with the increase of vibration. Work done by seal force is influenced by the phase difference between seal force and vibration. If the phase difference is nearly 90°, the work done is the maximum.