网壳结构损伤分区定位的模型试验研究
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摘要
提出了一种适合于网壳结构的损伤分区定位方法,该方法对网壳结构进行区域划分并按区布置传感器,通过单点激励得到结构的高阶模态响应,利用随机减量技术和ITD法获取模态参数,再利用损伤前后高阶振型的差值来定位损伤区域。最后,通过对一个单层椭球面网壳结构模型的振动测试试验,验证了所提方法的可行性。
A zoning location method is presented for damage of latticed shell structures. Using this method one zones a latticed shell structure, disposes sensors according to zones, and makes use of structural higher order mode responses which can be obtained using a single-point exciting to a structure. Modal parameters are identified by random decrement technique and ITD method. The damage zones are located by use of the differences between the higher order modal shapes before and after the structure is damaged. In the end, through a vibration test to a single-layer ellipsoidal latticed shell model, the feasibility of the method presented here is validated.
A zoning location method is presented for damage of latticed shell structures. Using this method one zones a latticed shell structure, disposes sensors according to zones, and makes use of structural higher order mode responses which can be obtained using a single-point exciting to a structure. Modal parameters are identified by random decrement technique and ITD method. The damage zones are located by use of the differences between the higher order modal shapes before and after the structure is damaged. In the end, through a vibration test to a single-layer ellipsoidal latticed shell model, the feasibility of the method presented here is validated.
引文
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[3]Ibrahim S R.Random Decrement Technique for Modal Identifi-cation of Structures[J].AIAA J.of Spacecraft and Rockets,1977,14[11]:696—700.
[4]马维金等.基于LSCE算法和FDD算法的振动筛动态特性研究[J].振动、测试与诊断,2003,23[3]:195—198.
[5]欧进萍等.基于ARMA模型和自由振动提取技术的海洋平台结构参数识别[J].应用数学与力学,2003,24[4]:398—404.
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[7]李德葆.关于复模态理论的数学方法、物理概念及其与实模态理论的统一性[J].清华大学学报,1985,25[3]:26—37.
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