Transmissibility characteristics of semi-active vibration isolator based on controllable electro-magnetic negative stiffness
MENG Kai1, GU Yong2, LIU Yuxi1, MA Tao1
1. School of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, China;
2. Design and Development Department, Jiangsu Branch of China Academy of Mechanical Sciences & Technology Co., Ltd., Changzhou 213164, China
Abstract：Aiming at the defects of traditional vibration isolators that the stiffness is not adjustable, a new semi-active vibration isolator based on negative stiffness control is proposed, and its stiffness controllability and vibration isolation performance are evaluated by the characteristics of absolute displacement transmissibility. First, based on the field theory and the equivalent magnetic charge method, a theoretical calculation formula for the electromagnetic negative stiffness was established, and the formula has a functional relationship with the excitation current. Secondly, for the complexity of electromagnetic negative stiffness calculation, the negative stiffness calculation formula was approximated by the least square method. Furthermore, based on the approximate expression of the negative stiffness, a semi-active vibration isolator with positive and negative stiffness in parallel was established, and the influence of the excitation current on the transmissibility and the damping ratio were analyzed. Finally, the current effect law on the isolator transmissibility under the linear conditions was experimentally verified.
孟凯1,顾勇2,刘豫喜1,马涛1. 基于可控电磁负刚度的半主动隔振器传递率特性研究[J]. 振动与冲击, 2022, 41(7): 228-234.
MENG Kai1, GU Yong2, LIU Yuxi1, MA Tao1. Transmissibility characteristics of semi-active vibration isolator based on controllable electro-magnetic negative stiffness. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(7): 228-234.
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