双层流体浮筏的隔振特性研究  

Study of the Vibration Isolation of Two-degree-of-freedom Fluid-type Floating Raft

作　　者：刘春嵘[1] 肖卫明[1] 徐道临[1] 

机构地区：[1]湖南大学机械与运载工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2013年第1期43-48,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(11272116)

摘　　要：基于反共振原理,提出了能隔离包含2个频率成分振动的双层流体浮筏隔振装置,在小振幅假设下建立了双层流体浮筏系统的数学模型.分析系统的隔振机理,给出了力传递率的表达式.分析表明,双层流体浮筏具有2个反共振频率且可通过改变液位高度实现调节.将双层流体浮筏与质量和等效刚度相同的单层流体浮筏和传统质量-弹簧隔振系统进行比较,结果表明,双层流体浮筏在传统质量-弹簧系统没有隔振效果的低频段具有良好的隔振效果.当双层流体浮筏2个反共振频率一致时,其具有比单层流体浮筏更好的反共振隔振效果.A two-degree-of-freedom （TDOF） fluid-type floating raft system was propoesd for vibration isolation based on anti-resonance mechanism, which enables completely isolate vibrations, including two frequency components. The mathematical model of TDOF fluid-type floating raft was derived under the as- sumption of small amplitude vibration. The isolation behavior of the floating raft was analyzed, and the expression of force transmissibility was obtained. The analysis indicates that TDOF fluid-type floating raft possess two anti-resonance frequencies, which can be tuned by changing the liquid level. The isolation be- havior of TDOF fluid-type floating raft was compared with that of single-degree-of-freedom （SDOF） fluid- type floating raft and classical mass-spring isolation system. It shows that TDOF fluid-type floating raft has effect of vibration isolation at low frequency, and it also has better effect of vibration isolation than SDOF fluid-type floating raft when the two anti-resonance frequencies are equal to each other.

关 键 词：振动控制 流体浮筏 反共振 双层隔振器 低频隔振 

分 类 号：O328[理学—一般力学与力学基础]