刚-液-柔耦合结构湿模态试验与仿真分析  

Wet modal tests and numerical simulation for a rigid-liquid-flexible coupled structure

作　　者：蔡克伦 刘玉红[1,2] 朱亚强[1,2] 黄成 张连洪[1,2] CAI Kelun;UU Yuhong;ZHU Yaqiang;HUANG Cheng;ZHANG Lianhong(School of Mechanical Engineering,Tianjin University,Tianjin 300354,China;MOE Key Lab of Mechanism Theory and Equipment Design,Tianjin 300354,China)

机构地区：[1]天津大学机械工程学院,天津300354 [2]机构理论与装备设计教育部重点实验室,天津300354

出　　处：《振动与冲击》2020年第23期128-134,147,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51675372);问海计划项目(2017WHZZB0303)。

摘　　要：基于物理模型试验及有限元仿真实验的方法,研究了一种刚-液-柔固液耦合结构的模态特性。制作了实物物理模型,利用锤击法测量了该结构在三种不同充液水压下的湿模态固有频率特性及振型特征,发现该结构有很好的吸振作用。同时基于ANSYS Workbench软件平台,采用声固耦合算法对该结构进行了不同内外压力下湿模态的分析,研究了其固有频率与振型在不同内外压力下的变化情况。分析结果显示,对该结构进行模态分析时不可忽略流体的附加质量效应,内外压力的增大均会引起固有频率的降低。分析结果对相关结构的湿模态分析提供了参考。Based on physical model tests and finite element simulation,modal characteristics of a rigid-liquid-flexible coupled structure,a miniature model of"haiyan"underwater glider,was studied.Using hammering method,this structure’s wet modal frequencies and modal shapes characteristics under 3 different liquid-filled water pressures were measured.It was found that the structure has good vibration absorption action.Meanwhile,based on the acoustic-structure coupled algorithm of ANSYS Workbench software platform,the wet modal analysis of this structure was performed under different internal and external pressures to study variation of its wet modal frequencies and modal shapes.Analysis results showed that liquid additional mass effect can’t be ignored during modal analysis of this structure;increase in internal and external pressures can cause the structure’s wet modal frequencies to drop;the study results can provide a reference for wet modal analysis of relevant structures.

关 键 词：刚-液-柔耦合 湿模态 声固耦合 模态仿真 

分 类 号：TH766[机械工程—仪器科学与技术]