干摩擦阻尼对旋翼动稳定性的影响研究

Effect of dry friction damping to rotor dynamic stability

摘要:

为了提高旋翼动稳定性理论模型的分析精度,需要精确地确定旋翼系统的结构阻尼系数。为此建立了旋翼变距拉杆球头关节干摩擦的阻尼模型,计入了球头关节的离心力对干摩擦阻尼的影响,然后用模型旋翼试验数据对稳定性分析结果进行了验证。结果表明,采用文中建立的干摩擦阻尼模型,预估的旋翼摆振后退型模态阻尼与试验数据吻合。

Abstract:

To analyze helicopter rotor dynamic stability with a high degree of accuracy, accurate and reliable damping coefficient determinations of rotor structure are needed. A dry friction damping model for hinges of a pitch rod is presented, and the effect of the hinge centrifugal to its friction damping is taken into account. Then the dynamic stability analysis is validated with test data of a scaled rotor. Result shows that, with applications of the dry friction damping model presented in the paper, the predictions of regressive lag modal damping correlates the test data very well.