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电动伺服舵系统动力学建模及颤振分析

1. 1. 北京航空航天大学航空科学与工程学院
2. 北京航空航天大学 航空科学与工程学院
3. 北航5系
• 收稿日期:2015-07-03 修回日期:2015-09-08 发布日期:2015-09-17
• 通讯作者: 吴志刚
• 基金资助:
国家自然科学基金

Dynamic Modeling and Flutter Analysis of a Fin-actuator System

• Received:2015-07-03 Revised:2015-09-08 Published:2015-09-17

Abstract: Dynamics of an actuator have a direct impact on the flutter characteristics of a fin structure. So it is key important to built the dynamic model of the fin-actuator system precisely before a flutter analysis. A typical fin-actuator system is investigated by constructing its motor model, reducer model and controller model, respectively. Based on the test data, two nonlinear factors are considered including the contact stiffness between the screw and the balls, as well as the freeplay. Simulation results reproduce what were seen in the test. It is found that the contact stiffness and the freeplay dominate the dynamic characteristics of the fin-actuator system. In the flutter analysis, responses under contact stiffness and constant stiffness are compared. The results show that a LCO domain and an unstable domain exist under the constant stiffness. Its critical velocities don’t vary with the freeplays. However, besides the LCO and unstable domains, a stable domain appears under the contact stiffness. At a specific flow velocity, its critical command angle is higher than the one under constant stiffness. But its critical velocity decreases as the freeplay increases, even reaches a lower level than the critical velocity under constant stiffness. Enough attentions should be paid on this issue.