基于杆件柔性的舱门机构动力学特性影响分析

Analysis on the Dynamics Effect of Flexible Bar for Cabin's Door Mechanism

针对舱门机构类似故障模式,需要考虑构件柔性对舱门动力学特性的影响。运用第二类lagrange方程,提出一种刚柔耦合机构建模的新方法。模型计算结果表明,当杆件没有任何损伤时,杆件的柔性对舱门机构动力学响应影响很小。随着杆件的使用,难以避免产生如磨损、腐蚀、裂纹等损伤,这时柔性杆对舱门机构动力学特性的影响就非常显著,随着损伤程度的加深,终将导致舱门机构失效。模型计算结果与工程经验吻合,为舱门机构退化规律的分析和健康管理的研究提供数据参考。

For a cabin＇ door mechanism, it is necessary to take into account the flexible- bar and analyze its effect on the dynamic responses. In this paper the rigid and flexible coupling dynamic model of a cabin ＇ door mechanism was established in a new method with the second kind of Lagrange＇s e- quation. The numerical simulation results of this model showed that the effect, which was responsi- ble by the flexibility of the bar, on the whole dis- placement response was limited when the link bar was healthy and without any cracks. If there were any faults, as scratch, corrosion, and fatigue crack etc, the effect on the dynamic characteristics would be visible. Its vibration responses would be serious and the accuracy of the movement would be bro- ken. All the simulation results were keeping withthe engineering experiences and can be utilized as the numerical references for the degradation rules and health monitoring of cabin＇s door mechanism.