弹簧展开铰链锁定冲击及减小冲击方法

Approaches to calculate and reduce locking impact of deployable hinges

为减小空间可展开机构中弹簧展开铰链应用时易产生的冲击,通过拉格朗日方程与赫兹方程,提出铰链展开末端的冲击加速度和冲击力矩的计算方法,分析影响冲击力矩大小的主要因素,首次从组合机构的角度,提出间歇性运动机构和耗能型机构两种降低弹簧展开铰链展开末端冲击的设计方案,从能量的角度讨论两种机构减小铰链冲击方法的作用效果.对两种降低铰链冲击的机构进行三维建模,并对模型进行仿真验证.仿真结果表明:间歇性运动机构和耗能型机构分别可以使冲击力矩减少约90%和31%.研制两种低冲击铰链机构样机,并进行试验和测试,冲击加速度测量结果表明,间歇性运动机构和耗能型机构可以分别使铰链展开末端冲击速度降低约95%和40%.

Severe impact is detected in the application of deployable hinges in aerospace mechanisms such as solar array. The impact may result in failure of accessories connected to the hinges. To tackle this problem, this paper firstly proposes an approach to calculate magnitude of angular velocity and impact torque, based on which the key factor affecting the impact is concluded. Two schemes are devised based on intermittent mechanism and energy- storage mechanism. The effectiveness of the schemes to decrease the impact is discussed from the view of energy. Two structure models are built for each scheme and simulated to verify their feasibility. The simulation results indicate that the impact torque can be reduced by approximately 90% and 31%, respectively. In addition, two prototypes are manufactured, on which experiments of angular acceleration measurement are conducted, and the results demonstrate that the impact can be diminished by 95% and 40%, respectively.