Infrared and Laser Engineering, Volume. 45, Issue 11, 1118001(2016)
Support design of secondary mirror based on active constrained layer damping treatments
Active constrained layer damping treatments were applied to the secondary mirror supporting structure for space telescopes in order to improve its dynamic performance. Active constrained layer damping treatments, which apply piezoelectric actuators and viscoelastic materials to flexible structures, promise to be an effective means of vibration suppression in flexible structures. A finite element model for active constrained layer damping treatments was developed and a proportional derivative control law was applied on piezoelectric ceramics. Effects of key parameters, such as viscoelastic layer thickness and control gain were investigated. It is shown that the increase of viscoelastic layer thickness and control gain could both enhance the damping capability. However, the actuation ability of piezoelectric ceramics is reduced by the viscoelastic layer. Analysis results of the telescope indicate that natural frequencies of the supporting structure decrease slightly after employing active constrained layer damping treatments. However, the frequency response at the secondary mirror is suppressed apparently and the surface accuracy is improved as well.
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Tian Shitao, Xu Zhenbang, Qin Chao, Xia Mingyi, Wu Qingwen. Support design of secondary mirror based on active constrained layer damping treatments[J]. Infrared and Laser Engineering, 2016, 45(11): 1118001
Category: 光学设计及仿真
Received: Mar. 5, 2016
Accepted: Apr. 8, 2016
Published Online: Jan. 20, 2017
The Author Email: Shitao Tian (tianst820@163.com)