摘要
航天器外伸的太阳帆板会引起驱动扰动和残余振动两类振动问题,且两者发生在不同的振动方向(扭转和弯曲),并属于不同的振动类型(强迫与自由振动)。提出一种多自由度减振装置实施方案,通过调整驱动系统动态特性降低两类振动干扰。基于虚功原理建立了太阳帆板驱动系统动力学模型,分析了减振装置刚度和阻尼参数对驱动系统动态特性的影响规律,研制了减振装置原理样机,并通过试验验证其减振效果。结果表明,减振装置刚度特性对驱动系统的固有频率至关重要,需要谨慎考虑以避免共振;减振装置等效阻尼与驱动系统模态阻尼呈正相关,应采用高损耗系数的阻尼材料;减振装置能使驱动扰动降低40%以上,99%残余振动幅值衰减时间缩短56%以上。
The outstretched solar array on spacecraft causes two types vibration problems of driving disturbance and residual vibration.They occur in torsional direction and in bending one,and belong to forced vibration and free one.Here,an implementation scheme of multi-DOF vibration reduction device(MVRD)was proposed to adjust dynamic characteristics of the solar array driving system(SADS)for the purpose of reducing two kinds vibration disturbances.Firstly,the dynamic model of SADS was established based on the principle of virtual work to analyze the influence law of stiffness and damping parameters of MVRD on dynamic characteristics of SADS.Then,a prototype of MVRD was developed,and its vibration-reduction effect was verified with tests.The results showed that stiffness characteristics of MVRD are very important to natural frequencies of SADS,and these characteristics need to be carefully considered to avoid resonance;the equivalent damping of MVRD is positively correlated to modal damping of SADS,damping materials with high loss coefficient should be adopted;MVRD can reduce driving disturbance by more than 40%and the attenuation time for 99%residual vibration amplitude value by more than 56%.
作者
朱仕尧
雷勇军
郭欣
ZHU Shiyao;LEI Yongjun;GUO Xin(College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第3期156-164,共9页
Journal of Vibration and Shock
关键词
太阳帆板
多自由度
残余振动
驱动扰动
动力学特性
solar array
multi-DOF
residual vibration
driving disturbance
dynamic characteristics
