Design and Experiment of a Vibration Isolator for Low Frequency and Large Amplitude Excitation
Vibration isolators with high-static-low-dynamic-stiffness (HSLDS) characteristics are re-quired in order to break through the contradiction between the stiffness and the load bearing capacity of the traditional vibration isolator. Nowadays, quasi-zero-stiffness vibration isolator technology can realize low-frequency vibration isolation under a small amplitude, but for large amplitude vibration, the vibra-tion isolation effect is weakened or even ineffective. Therefore, wide-range amplitude vibration isolation has become a problem to be solved in the field of vibration isolation. In order to solve the problem of small vibration suppression amplitude of traditional vibration isolators, a parallel-assembly origami vi-bration isolator with wide zero stiffness range is proposed. The dynamic model of the origami vibration i-solator with wide zero stiffness range is established, and design methodology for wide zero stiffness range is proposed. Based on the dynamic model, the vibration isolation effectiveness is analyzed. Final-ly, the correctness of the dynamic analysis is verified experimentally. This new design breaks through the design criterion of the traditional quasi-zero stiffness isolator that zero stiffness is only achieved at a specific point. Stability can be guaranteed over a large range, while achieving zero stiffness, which great-ly broadens the application range of vibration isolators. This design concept can be used in the design of new vibration isolation materials and in large low-frequency dynamic environments such as aerospace and ships.
wide range zero stiffnesshigh-static-low-dynamic-stiffness systemsnonlinear vibration isolationlow frequency excitation
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