基于能量有限元法的损伤板结构振动分析

发布时间：2017-12-27 00:28

本文关键词：基于能量有限元法的损伤板结构振动分析　出处：《振动与冲击》2017年11期 　论文类型：期刊论文

【摘要】：工程结构在服役期间会出现各种形式的损伤,其结构动力学参数和能量传播形式也会随之产生变化,因此基于振动的结构损伤识别得到了广泛的研究并在工程运用中具有重要的意义。采用能量有限元法对含有损伤的平板和耦合板结构的振动特性进行分析,算例分析中分别采用能量有限元法和有限元法对平板的能量密度进行了计算和对比,验证了能量有限元法的准确性。在此基础上提出了基于能量密度变化和结构声强变化的两个损伤指标,并对损伤识别指标进行了可视化分析,随后通过算例对比进一步确定基于能量有限元得到的结构声强变化能够有效地识别板结构的损伤部位,并对含有损伤的耦合板的结构声强进行了研究,为今后将能量有限元法进一步应用到结构损伤识别中提供了基础。
[Abstract]:During the service period, various forms of damage will appear in engineering structure, and its structural dynamic parameters and energy transmission forms will also change. Therefore, vibration based structural damage identification has been widely studied and has great significance in engineering application. The energy finite element method is used to analyze the vibration characteristics of the damaged plate and the coupling plate structure. In the example analysis, the energy density of the plate is calculated and compared by the energy finite element method and the finite element method respectively, and the accuracy of the energy finite element method is verified. Based on the proposed two damage index of energy density change and structure change based on sound intensity, and the damage identification index of visual analysis, followed by examples to further determine the energy finite element structural intensity changes can effectively identify damage location in structure based on the coupling and plate with damage the structural intensity is studied, for the future of energy finite element method is further applied to structural damage identification provides a foundation.
【作者单位】：华中科技大学船舶与海洋工程学院;船舶与海洋水动力湖北省重点实验室;
【基金】：国家自然科学基金(51479079) 船舶预研支撑技术基金(13J1.3.2)
【分类号】：O327
【正文快照】： 通常来讲,结构可以看成是由刚度、质量和阻尼矩阵组成的一个力学系统。因此,如果结构出现损伤,其相应的结构参数也会随之发生变化,从而表现出系统的静动态特性,比如刚度、位移等参数的改变,因此结构的静动态特性参数的变化可以作为结构损伤识别的标志[1]。一般情况下,结构中损

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