摘要
为解决二级减振引起个别仪器振动的局部放大、使得力学环境不能满足运行要求的问题,首先,针对金属橡胶双层减振系统,充分考虑安装板的柔性刚度,建立了刚柔复合的二级减振系统模型;其次,基于目标频率对二级减振的频率响应函数进行系统的刚度解耦,实现了减振器刚度的求解,并应用有限元进行随机振动分析,验证了刚柔复合二级减振系统理论模型的可行性;最后,利用振动台进行了试验验证。结果表明,当二级减振系统满足工程刚度需求,其一阶固有频率低于40 Hz时,减振效率可达到70%以上,试验与仿真结果基本一致。
With regards to the mechanical environment not meeting operational requirements,several steps are taken to address the issue of local amplification of vibrations in individual instruments caused by secondary isolation.Firstly,regarding the metal rubber double-layer isolation system,the flexible stiffness of the mounting plate is fully considered,and a secondary vibration reduction system model with both flexibility and rigidity is established.Secondly,based on the target frequency,the frequency response function of the secondary vibration reduction system is decoupled systematically to solve for the stiffness of the damper.Finite element analysis is then employed for random vibration analysis to validate the feasibility of the theory model of the composite secondary isolation system.Finally,the experimental verification is conducted using a vibration table.The results indicate that when the secondary isolation system meets the engineering stiffness requirements and its first natural frequency is below 40 Hz,the vibration reduction efficiency can reach over 70%.Experimental results are generally consistent with the simulation results.
作者
石先杰
郭卓涛
黄舟
周春辉
任志英
SHI Xianjie;GUO Zhuotao;HUANG Zhou;ZHOU Chunhui;REN Zhiying(Institute of General Engineering,China Academy of Engineering Physics Mianyang,621999,China;School of Mechanical Engineering and Automation,Fuzhou University Fuzhou,350116,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2024年第3期494-501,618,共9页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金NSAF联合重点资助项目(U2330202)
国家自然科学基金资助项目(52175162,51975123)。
关键词
二级柔性减振
金属橡胶减振器
随机振动
固有频率
减振效率
secondary flexible vibration isolation
metal rubber shock absorber
random vibration
natural frequency
damping efficiency
