周期桁架结构浮筏隔振特性分析与实验研究  

Analysis and Experiment on Vibration Isolation Characteristics of a Periodic Truss Raft System

作　　者：程世祥[1] 张志谊[1] 华宏星[1] 

机构地区：[1]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：《噪声与振动控制》2011年第6期5-9,共5页Noise and Vibration Control

基　　金：国家安全重大基础研究973项目(613100)

摘　　要：利用周期结构特性和波形转换作用,提出一种新型周期桁架结构浮筏。首先利用有限元方法建立浮筏结构的数值模型并计算其频响特性,通过频响函数综合建立包含机组、浮筏和基础的振动传递模型,在隔振系统中评价新型桁架浮筏的性能,然后在此基础上,对新型桁架浮筏隔振系统进行实验验证。结果表明:周期桁架结构浮筏比传统浮筏能够更有效地抑制振动传递,组成浮筏隔振系统后,在与浮筏上下层隔振器的共同作用下,整个隔振系统在更宽的频段内对振动传递产生抑制作用。Utilizing the characteristics of periodic structures and waveform conversion function, a new floating ratt wltn periodic truss structures; is proposed. Frequency response functions of the new floating raft are calculated by the finite element method （FEM） and used in the FRF-based substructure method, which establishes a model of the assembled system involving the periodic truss raft as well as a base structure and equipment to evaluate the performance of the raft in an isolation system. Experiment is conducted to verify the simulation results. It is found that the floating raft with periodic truss structures has a better performance in suppressing vibration transmission than the traditional floating raft. When the new rafting system is composed of the floating raft and vibration isolators, the entire isolation system can reduce vibration transmission over a wider frequency band.

关 键 词：振动与波 周期桁架 浮筏隔振系统 频响函数综合 振动传递 

分 类 号：O328[理学—一般力学与力学基础]