Development of Negative Stiffness Systems Using Voice Coil Motors

• Main Authors: Lin, Ying-Fan, 林英帆
• Other Authors: Cheng, Chih-Chun
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/77228567255026894323

碩士 === 國立中正大學 === 機械工程學系暨研究所 === 100 === Negative stiffness produced by a voice coil motor to improve the performance of a vibration isolation system at low frequency is proposed. The passive isolator maintains its original stiffness while the system is statically in its equilibrium position. This isolator stiffness is reduced by the voice coil motor when the system vibrates away from its equilibrium position. The natural frequency of the system decreases due to negative stiffness produced by the voice coil motor, so its performance of vibration isolation can be improved. A circuit that determines the system is above or below its static equilibrium position is designed to timely actuate the voice coil motor. Results from both simulations and experiments show that the system stiffness is indeed reduced by the voice coil motor. Experimental results show that the performance in vibration isolation is improved for only2dB; however, it is believed that the isolation performance can be further improved if a more powerful actuator is adopted.