Improving Low Frequency Isolation Performance of Optical Platforms Using Electromagnetic Active-Negative-Stiffness Method

Applied Sciences

卷:10

Yamin Zhao¹  Limin Zou¹  Junning Cui¹  Xingyuan Bian¹  Junchao Zhao² 

[1] Center of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150080, China;

[2] Shanghai Marine Equipment Research Institute, Shanghai 200031, China;

关键词: active negative stiffness;    optical platform;    laser interferometry sensor;    electromagnetic actuator;   

DOI  :  10.3390/app10207342

来源: DOAJ

【 摘 要 】

To improve the low-frequency isolation performance of optical platforms, an electromagnetic active-negative-stiffness generator (EANSG) was proposed, using nano-resolution laser interferometry sensors to monitor the micro-vibration of an optical platform, and precision electromagnetic actuators integrated with a relative displacement feedback strategy to counteract the positive stiffness of pneumatic springs within a micro-vibration stroke, thereby producing high-static-low-dynamic stiffness characteristics. The effectiveness of the method was verified by both theoretical and experimental analyses. The experimental results show that the vertical natural frequency of the optical platform was reduced from 2.00 to 1.37 Hz, the root mean square of displacement was reduced from 1.28 to 0.69 μm, and the root mean square of velocity was reduced from 14.60 to 9.33 μm/s, proving that the proposed method can effectively enhance the low frequency isolation performance of optical platforms.

【 授权许可】

Unknown