L型耦合板相关激励下高频随机能量流分析  

High frequency random energy flow analysis of L-shaped coupled plates under coherent excitations

作　　者：游进[1] 孟光[1] 李鸿光[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：《振动工程学报》2010年第1期60-63,共4页Journal of Vibration Engineering

基　　金：科技部国际科技合作重点项目(2005DFA00110)

摘　　要：将板的能量流分析法应用于耦合板结构受随机激励的情形,并用无限板导纳近似有限板导纳的方法考虑了随机力的相关性对输入功率的影响。对在同一块板上受到两个相关或不相关随机力作用的L型耦合板的能量响应和功率流进行了计算,结果反映了能量密度的空间分布和功率在子结构间和内部的传递路径。两种相关激励条件下的结果对比表明,作用于所考虑位置上的随机激励间的相关性对耦合结构的能量响应及功率传递的影响很小。对该L型耦合板的响应用传统的统计能量分析法进行了求解,其结果与能量流分析法预测的主要能量场的响应基本一致,说明了考虑随机力间相关作用的能量流分析法应用的有效性。Energy flow analysis method （EFA） is utilized to random excitations. The effects of the interference between model the vibration behavior of coupling plate structures under random forces on the power input spectra are＇considered by approximating the mobility of a finite plate with that of an infinite one. For an L-shaped plate that is subject to two coherent or incoherent random forces on one plate, both energy response and power flow are evaluated using EFA. Comparison between results of the two loading cases indicates that for the excitation positions considered the interference between the random forces has little effect on the energy response as well as power flow of the coupling structure. The response of the structure is also estimated using conventional statistical energy analysis method. A small discrepancy is observed between energy solutions from the two methods especially with respect to the flexural energy component, which validates the application of EFA for plate structures under random excitations where the coherence between random forces is considered.

关 键 词：能量流分析 能量有限元分析 随机激励 高频 相关性 

分 类 号：TB533[理学—物理] TB123[理学—声学]