低频非线性浮筏隔振装置设计及特性研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (3) : 86-92.

论文

低频非线性浮筏隔振装置设计及特性研究

李步云1, 2，帅长庚1, 2，马建国1, 2

作者信息 +

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

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

Author information +

文章历史 +

摘要

低频振动噪声影响水下装备声隐身性能。在原气囊隔振装置基础上，通过结构改进设计，使得侧向气囊能够为系统提供负刚度，通过与垂向气囊并联，设计了一种新型非线性浮筏隔振装置，提升了隔振装置的低频隔振能力。新型隔振装置由“侧向气囊-万向节-垂向气囊”非线性隔振器组和浮筏组成。分析了侧向气囊为系统提供负刚度原理，建立了非线性浮筏隔振装置六自由度动力学模型，设计了新型隔振装置样机并开展了相关性能试验。理论分析和试验结果表明，新型非线性浮筏隔振系统垂向一阶固有频率约为原系统的50%，垂向隔振性能提升了约6dB，侧向隔振性能与原系统相当。此外，也研究了非线性浮筏隔振系统的摇摆稳定性。研究结果表明，在重载情况下，新系统能够具备较好的摇摆稳定性。

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.

导出引用

李步云1, 2，帅长庚1, 2，马建国1, 2. 低频非线性浮筏隔振装置设计及特性研究[J]. 振动与冲击, 2024, 43(3): 86-92

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

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