期刊
IEEE-ASME TRANSACTIONS ON MECHATRONICS
卷 26, 期 4, 页码 2038-2047出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMECH.2020.3029579
关键词
Electric shock; Isolators; Springs; Electromagnetic forces; Vibrations; Force; Electromagnetic mechanism; shock isolation; variable stiffness (VS)
类别
资金
- National Natural Science Foundation of China [61922053, 91748116, 61773254, 61625304, 61873157]
- Science and Technology Commission of Shanghai [16441909400, 17DZ1205000]
This article presents a novel electromagnetic variable stiffness isolator that achieves bidirectional stiffness regulation, providing good vibration isolation performance and high damping effect. By combining mechanical springs with hybrid magnets, the isolator can adjust overall stiffness by manipulating the current.
This article presents a novel electromagnetic variable stiffness isolator that achieves bidirectional stiffness regulation, which means that the isolator experiences a reduced stiffness when the applied current is positive and an increased stiffness when the opposite current is applied. In addition, the stiffness variations are equal for two currents with the same magnitude but opposite polarities. The proposed isolator can not only ensure the vibration isolation performance in working frequency zone that is relatively far from the natural frequency, but also can realize high-damping-like effect for shock response attenuation, without introducing any additional damping components that may complicate the system. The bidirectional stiffness regulation was realized by combining mechanical springs with hybrid magnets (permanent magnets and coil windings). Variation in the overall stiffness of the proposed isolator occurred when the current was continuously adjusted. A prototype of the isolator was designed, fabricated, and then tested with a round displacement step shock at the base. The theoretical analysis revealed that this device could be utilized as an active vibration isolator through certain control strategies. The experimental results proved the effectiveness of the proposed mechanism in shock isolation and revealed that it outperforms the conventional isolator in suppressing the residual vibration.
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