摘要
建立了结构振动的有限元模型和声学分析的边界元模型,基于边界元法推导了声学响应函数的计算公式,利用声学响应函数和激励谱密度推导了设计域点响应声压的自谱密度函数.以平板稳态振动声辐射为研究算例,计算了1~200 Hz的声学频率响应函数,并计算了系统受常谱密度和变谱密度随机载荷激励的声学响应.理论推导和实例结果表明,基于边界元法的声学响应函数可有效的求解随机声场.
A finite element model of structure vibration and boundary element model for acoustic radiation analysis are established,the acoustic frequency response function is deduced based on FEM/BEM,and the acoustic pressure response feature is formulated by acoustic response function and the spectral density function of the stimulating load.The results of a random vibration plate example show that the FEM/BEM is effective for the acoustic simulation of structure random vibration and the acoustic response feature of random vibration depend on the acoustic response function and the spectral density function of stimulating load.
出处
《大连交通大学学报》
CAS
2010年第3期20-23,32,共5页
Journal of Dalian Jiaotong University
基金
辽宁省教育厅高等学校科学研究计划资助项目(20060182
2008102)
关键词
边界元法
有限元法
随机振动
频率响应函数
谱密度函数
boundary element method finite element method random vibration the acoustic response function the spectral density function