Design and characteristics of low-frequency nonlinear floating raft vibration isolation device

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (3) : 86-92.

LI Buyun1,2, SHUAI Changgeng1,2, MA Jianguo1,2

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Abstract

Low-frequency vibration affects the acoustic stealth performance of underwater equipment. A novel nonlinear floating raft vibration isolation system is proposed based on air spring. The structure design makes the lateral air spring provide negative stiffness to the system and improve the low-frequency vibration isolation performance. The new system consists of "lateral air spring-universal joint-vertical air spring" nonlinear vibration isolator group and floating raft. The mechanism of the negative stiffness generated is analyzed, the six-degrees-of-freedom dynamic model of the nonlinear floating raft vibration isolation system is established, the prototype of the new system is designed, and the related performance tests are carried out. Theoretical analysis and experimental results show that the vertical first order natural frequency of the new system is approximately reduced to 50% of that of the original system, and the vertical vibration isolation performance is improved by about 6dB, and the lateral vibration isolation performance is similar to that of the original system. In addition, the rolling stability of nonlinear floating raft vibration isolation system is also studied. The results show that the new system can have good rolling stability under heavy load.

Key words

floating raft vibration isolation system / air spring vibration isolation system / nonlinear vibration isolation / negative stiffness / rolling stability

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LI Buyun1,2, SHUAI Changgeng1,2, MA Jianguo1,2. Design and characteristics of low-frequency nonlinear floating raft vibration isolation device[J]. Journal of Vibration and Shock, 2024, 43(3): 86-92

References

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