低频非线性浮筏隔振装置设计及特性研究  

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

作　　者：李步云 帅长庚[1,2] 马建国 LI Buyun;SHUAI Changgeng;MA Jianguo(Institute of Noise&Vibration,Naval University of Engineering,Wuhan 430033,China;National Key Laboratory on Ship Vibration&Noise,Wuhan 430033,China)

机构地区：[1]海军工程大学振动与噪声研究所,武汉430033 [2]船舶振动噪声重点实验室,武汉430033

出　　处：《振动与冲击》2024年第3期86-92,共7页Journal of Vibration and Shock

基　　金：国防科技研究项目(HJ2019C020499)。

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6 dB,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。Low frequency vibration and noise affects acoustic stealth performance of underwater equipment.Here,based on the original airbag vibration isolation device,improving structural design,lateral airbag could provide negative stiffness to the system,through parallel connection with vertical airbag,a new type nonlinear floating raft vibration isolation device was designed to enhance its low-frequency vibration isolation ability.The new type vibration isolation device was composed of a nonlinear isolator set of“lateral airbag-universal joint-vertical airbag”and a floating raft.The principle of lateral airbag to provide negative stiffness to the system was analyzed to establish a 6DOF dynamic model of the new device.Its prototype was designed to conduct relevant performance tests.Theoretical analysis and test results showed that the vertical first-order natural frequency of the new nonlinear floating raft vibration isolation system is about 50%of that of the original system,its vertical vibration isolation performance is improved by about 6 dB;its lateral vibration isolation performance is comparable to that of the original system;the rolling stability of the new system can be better under heavy load.

关 键 词：浮筏隔振系统 气囊隔振装置 非线性隔振 负刚度 摇摆稳定性 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3