中低频激励下耦合板架振动能量分布与传递特性分析  

Vibration Energy Distribution and Transfer Characteristics of Coupled Plates under Medium-low Frequency Excitation

作　　者：何鹏 向阳[1,2] 周洋[1] 李浩然 HE Peng;XIANG Yang;ZHOU Yang;LI Haoran(School of Energy and Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Key Laboratory of High Performance Ship Technology of Ministry of Education,Wuhan 430063,China)

机构地区：[1]武汉理工大学能源与动力工程学院,武汉430063 [2]高性能舰船技术教育部重点实验室,武汉430063

出　　处：《噪声与振动控制》2020年第2期13-22,共10页Noise and Vibration Control

基　　金：国防预研基金资助项目(10204010410)。

摘　　要：为了探究中低频振动传递机理,基于有限元结合二维平板的功率流理论,分析工程中常见的耦合板架在中低频激励下的振动能量分布与传递特性。通过自编程序对有限元计算结果进行后处理,分析不同频率下不同振动波形的振动能量分布特征,并使用双加速度传感器进行耦合板架的功率流测量,实验结果与仿真计算结果吻合度较好;在此基础上分析激励力、阻尼比、不同板厚、约束方式对耦合板架振动能量传递的影响,结果表明:选取机械设备的合适安装位置与形式、对结构附加阻尼材料、根据激励力所在频段合理确定敷设位置、增大中间传递板的板厚使振动能量传递曲线往高频偏移等手段有助于减小结构的功率流。The mechanism of medium-low frequency vibration transmissions is explored.Based on theory of power flow of two-dimensional plates and finite element analysis,the vibration energy distribution and transmission characteristics of the coupled plates under medium-low frequency excitation are analyzed.By post-processing of the finite element calculation results,vibration energy distribution characteristics of different vibration waveforms at different frequencies are analyzed.Meanwhile,power flow measurement of the coupled plate is carried out by using the method of double acceleration sensor.The experimental results are in a good agreement with the simulation results.On this basis,the influences of excitation force,damping ratio,different plate thickness and restraint manner on the vibration energy transfer of the coupled plate are analyzed.The results show that selecting the appropriate installation position and form of the mechanical equipment,reasonably determining the laying position of the additive damping material according to the frequency band of the excitation force and increasing the thickness of the intermediate transmission plate to shift the vibration energy transmission curve to high frequency direction are helpful for reducing the power flow of the structure.

关 键 词：振动与波 耦合板架 功率流 振动波 振动能量 

分 类 号：TB535[理学—物理] U661.44[理学—声学]