网结构隔振特性的理论与实验研究  

Theoretical and experimental study on the vibration isolation performance of a grid-structure

作　　者：裴亚鲁 黄修长[1,2] 张志谊[1,2] 

机构地区：[1]上海交通大学振动冲击噪声研究所,上海200240 [2]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《振动与冲击》2015年第1期13-18,共6页Journal of Vibration and Shock

基　　金：中国博士后科学基金面上资助项目(2013M530192);上海市博士后科研资助项目(12R21413800)

摘　　要：针对航天器微振动高性能隔振的特殊要求,提出一种基于网结构的新型隔振方法,对由振源-网结构-弹性边界构成的耦合系统进行了振动建模与分析。对于网结构,采用子结构导纳综合法建立其模型,获得了垂直于网面的频域振动方程;对于边界梁,采用弦-梁单向耦合,将动态张力沿垂直和水平方向分解,得到振动响应的完整描述。在此模型基础上,分析了耦合系统的振动传递特性。为验证理论的正确性,设计并搭建了网结构微振动实验台。结果表明,网结构平台具有良好的被动隔振效果,在较宽的频段内,可以实现20 d B以上的振动衰减。A novel vibration isolation method using a plane grid structure was presented to meet the special demand of high-performance vibration isolation against microvibration in spacecraft.The vibration of a coupled system,which consists of vibration source,grid structure and flexible support,was modeled and analyzed.The out-plane vibration equation of the grid structure in frequency domain was obtained by using the substructure mobility synthesis principle. Based on the assumption that the coupling between string and beam is unidirecional,a complete description of the vibration of the beam was achieved by decomposing the dynamic tension force of the string in the vertical and horizontal directions.The vibration transmission characteristics were analyzed in terms of the synthesized model and an experimental platform was set up to verify the isolaion performance of the grid structure.The results show that the grid-structure is effective in vibration isolation and more than 20dB attenuation in transmission can be achieved.

关 键 词：隔振平台 耦合系统 子结构导纳法 振动传递 

分 类 号：TB535.1[理学—物理]