基于ERA的统计能量分析参数确定方法

孔宪仁;张红亮

振动与冲击 ›› 2010, Vol. 29 ›› Issue (11) : 1-5,20.

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PDF(2527 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (11) : 1-5,20.
论文

基于ERA的统计能量分析参数确定方法


  • 孔宪仁;张红亮
作者信息 +

Identification of Statistical Energy Analysis Parameters Based on ERA

  • KONG Xian-ren; ZHANG Hong-liang
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文章历史 +

摘要


统计能量分析(SEA)是解决复杂结构高频动力学问题的有效方法,正确估计统计能量分析参数则是利用该方法得到可靠分析结果的关键。论文基于特征系统实现算法(ERA)提出一种确定统计能量分析参数的方法,首先应用ERA辨识统计能量分析系统的最小阶功率流模型,然后利用辨识模型的特征对修正初始统计能量分析模型,进而得到较精确、可靠的参数。三子系统SEA模型的仿真结果验证了利用该方法得到的统计能量分析参数的正确性,而且在一定测量噪声干扰下仍能保持较好的精度。最后,对铝蜂窝夹层结构小卫星的SEA模型进行了仿真,进一步验证了算法可应用于复杂结构的统计能量分析参数识别。



Abstract

Statistical Energy Analysis (SEA) is the most effective tool for the solution of high-frequency dynamical problems of complex structure. However, a reliable solution can be obtained by SEA under the precondition that SEA parameters which constitute the coefficients of the SEA equations are evaluated exactly. A method for identifying the parameters from experimental date is provided in the paper. The methodology begins with identifying a minimum order model of the power flow model utilizing the Eigensystem Realization Algorithm(ERA), then the eigenpairs of the identification model are used to update an initial computation SEA model that has a discrepancy with the true model. The SEA parameters are extracted from updated SEA model ultimately. Simulations are performed on the three subsystem model at different noise-to-ratios, and the result show that the methodology presented in this paper performs quite satisfactorily. Another analogous simulation is performed on a micro-satellite and the result indicates the methodology can be extended to identify the SEA parameters of a complicated model likewise.

关键词

特征系统实现算法 / 统计能量分析 / 模态密度 / 内损耗因子 / 耦合损耗因子

Key words

eigensystem realization algorithm / statistical energy analysis / modal density / damping loss factor / coupling loss factor.

引用本文

导出引用
孔宪仁;张红亮. 基于ERA的统计能量分析参数确定方法[J]. 振动与冲击, 2010, 29(11): 1-5,20
KONG Xian-ren;ZHANG Hong-liang. Identification of Statistical Energy Analysis Parameters Based on ERA[J]. Journal of Vibration and Shock, 2010, 29(11): 1-5,20

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