摘要
航天器中使用的轻质柔性桁架结构受到外扰时会产生振动，使安装其上的有效载荷不能正常工作。为此，提出了一种基于主被动电磁式动力吸振器的柔性结构振动控制方法。首先设计了动铁式结构的主被动电磁式吸振器，并对吸振器的磁场分布和膜片弹簧进行了有限元分析，其次研制了吸振器的原理样机，通过性能测试验证了设计的合理性。最后利用所研制的动力吸振器对三棱柱桁架结构进行了振动控制实验，实验中主动控制算法采用ADC控制。实验结果显示：吸振器对桁架一阶共振模态的被动抑振效果达50.83%,采用主动控制后，吸振器对共振和非共振模态的振动控制效果分别达到96.30%和81.40%。
Abstract
The vibration of lightweight flexible truss on spacecrafts leads to improper work of the payloads installed on these structures. To solve this problem, this paper proposes an approach to the vibration suppression of the flexible structure employing an active-passive electromagnetic dynamic vibration absorber (DVA). Firstly, a moving-magnet active-passive electromagnetic DVA is designed, and then a finite element method is used to analyze the magnetic field and membrane of DVA. Secondly, a prototype of the active-passive electromagnetic DVA is manufactured, and its rationality is tested. Finally, the vibration control experiment of a triangular truss using the DVA with the ADC control algorithm is conducted. The results show that the first-order resonant amplitude is reduced by 50.83% with passive DVA. Compared with the passive DVA, the first-order resonant and non-resonant amplitudes are reduced by 96.30% and 81.40% respectively with the active DVA.
关键词
动力吸振器 /
有限元分析 /
振动控制 /
桁架结构 /
自适应控制
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Key words
dynamic vibration absorber /
finite element analysis /
vibration control /
truss structure /
adaptive control
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杨恺;崔龙;黄海.
主被动电磁式动力吸振器及其在桁架振动控制中的应用[J]. 振动与冲击, 2012, 31(18): 14-19
Yang Kai;Cui Long; Huang Hai.
An Active-Passive Electromagnetic Dynamic Vibration Absorber and its Application for Vibration Suppression of Truss Structures[J]. Journal of Vibration and Shock, 2012, 31(18): 14-19
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