Journal
APPLIED SCIENCES-BASEL
Volume 10, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/app10207342
Keywords
active negative stiffness; optical platform; laser interferometry sensor; electromagnetic actuator
Categories
Funding
- National Natural Science Foundation of China [51675139, L1924059]
- Fundamental Research Funds for The Central Universities
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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 mu m, and the root mean square of velocity was reduced from 14.60 to 9.33 mu m/s, proving that the proposed method can effectively enhance the low frequency isolation performance of optical platforms.
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