Abstract：Aiming at the difficulty of vibration isolation for heavy machines with low-frequency, the vibration isolator of solid and liquid mixture (SALiM) companying with additional mass of solid element is proposed. Based on the dual-mass vibrator model of solid element, the dynamic equation of the SALiM vibration isolation system is established first. Then the theoretical expressions of isolation transmissibility are derived under both conditions of force excitation and base motion. As a result, the extreme value points on transmissibility curves are found. Further, the effects of the additional mass of solid element on transmissibility are investigated, and results show that the element’s additional mass does not affect the static load-bearing capacity of isolation device, but it reduces the resonance frequency, and thus such vibration isolator has the high static and low dynamic stiffness (HSLD) characteristics, which is a completely different mechanism to generate HSLD from the traditional nonlinear quasi-zero stiffness. More importantly, the minimum extreme point can be observed on transmissibility curve due to the existence of additional mass. Hence, the isolation effectiveness around the ‘anti-resonance’ frequency band has been improved greatly. Besides, the ratio of effective areas and solid element quantity are important parameters to dominate vibration isolation performance.
谭鑫. 带局域共振单元液固混合介质隔振器的动力学特性研究 [J]. 振动与冲击, 2024, 43(3): 189-193.
TAN Xin. Dynamic characteristics of a liquid-solid mixed medium vibration isolator with local resonance elements. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(3): 189-193.
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