Abstract:To broaden the vibration isolation frequency bandwidth of passive vibration isolator, realizing low frequency and even ultra-low frequency vibration isolation, a quasi-zero stiffness vibration isolator (QZS-VI) composed of negative stiffness mechanism and linear spring was studied. The negative stiffness mechanism was composed of cantilever beam combined geometrically nonlinear structure. The static and dynamic models of the isolator were established, and the restoring force-displacement and stiffness-displacement curves of the isolator were obtained. The amplitude-frequency response characteristics and stability of the isolator under force excitation were analyzed, as well as the influence of damping and excitation amplitude on its vibration isolation performance. The mechanical vibration exciter was built to verify the isolation performance of proposed QZS-VI. Theoretical analysis and experimental results showed that with the same bearing capacity, the proposed QZS-VI has broader vibration isolation frequency band than the corresponding linear isolator. This study provides a novel insight for the design of nonlinear QZS-VIs.
周兴华1,杨啸2,孙晓1,张建海1. 一种悬臂梁组合几何非线性结构准零刚度隔振器研究[J]. 振动与冲击, 2023, 42(11): 232-239.
ZHOU Xinghua1, YANG Xiao2, SUN Xiao1, ZHANG Jianhai1. Research on a quasi-zero stiffness vibration isolator equipped with cantilever beam and geometrically nonlinear structure. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(11): 232-239.
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