火箭蒙皮上梁结构的损伤识别方法研究
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摘要
针对火箭蒙皮上梁结构损伤识别问题,首先利用基于模态应变能的损伤识别指标,对火箭蒙皮上梁结构进行损伤位置识别,再利用基于广义柔度矩阵的损伤敏感函数并结合遗传算法,对火箭蒙皮上梁结构进行损伤程度大小的计算。该损伤识别方法以结构损伤导致模态参数变化为依据,通过对比损伤前后模态应变能变化构建损伤识别指标。在数值仿真中,对T型梁进行方法验证,发现该方法能够准确识别损伤位置和大小。最后根据火箭蒙皮上T型梁结构特点,设计试验并研究方法的可行性,发现在T型梁结构上,该方法能够有效地识别损伤位置和大小,误差均在5%以下。
The problem of damage identification of the beam structure on the rocket skin is studied. Firstly, the damage identification index based on the modal strain energy is used to identify the damage location of the upper beam structure of the rocket skin. Then, the damage sensitivity function based on the generalized flexibility matrix is combined with the genetic algorithm, and the damage degree of the upper beam structure of the rocket skin is calculated. The damage identification method is based on the change of modal parameters caused by structural damage, and the damage identification index is constructed by comparing the change of modal strain energy before and after the damage. In the numerical simulation, the method is validated by a T-shaped beam. It is found that the method can accurately identify the damage location and size. Finally, according to the structural characteristics of the T-beam on the rocket skin, the design is tested and the feasibility of the method is studied. It is found that this method can effectively identify the damage location and size for the T-beam structure, and the error is below 5 %.
The problem of damage identification of the beam structure on the rocket skin is studied. Firstly, the damage identification index based on the modal strain energy is used to identify the damage location of the upper beam structure of the rocket skin. Then, the damage sensitivity function based on the generalized flexibility matrix is combined with the genetic algorithm, and the damage degree of the upper beam structure of the rocket skin is calculated. The damage identification method is based on the change of modal parameters caused by structural damage, and the damage identification index is constructed by comparing the change of modal strain energy before and after the damage. In the numerical simulation, the method is validated by a T-shaped beam. It is found that the method can accurately identify the damage location and size. Finally, according to the structural characteristics of the T-beam on the rocket skin, the design is tested and the feasibility of the method is studied. It is found that this method can effectively identify the damage location and size for the T-beam structure, and the error is below 5 %.
引文
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[7] LI JING, WU BAISHENG, ZENG Q C, et al. A generalized flexibility matrix based approach for structural damage detection[J]. Journal of Sound and Vibration,2010, 329(22):4583-4587.
[8] HOLLAND J H. Adaption in natural and artificial systems[M]. Massachusetts:MIT Press, 1975.
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[10]陈家照,毛行.火箭蒙皮上L型梁的损伤识别方法的研究[J].噪声与振动控制,2017,37(Z1):694-698.
[2] HE X. Vibration damage identification and health monitoring of civil structures[D]. University of Califormia, San-Diego, 2008.
[3]史治宇,罗绍湘,张令弥.结构破损定位的单元模态应变能变化率法[J].振动动工工程程学学报报,1998,11(3):356-360.
[4]严平,李胡生,葛继平,等.基于模态应变能和小波变换的结构损伤识别研究[J].振动与冲击,2012,31(1):122-126.
[5]颜王吉.单元模态应变能灵敏度及其在结构损伤识别中的应用[D].长沙:中南大学,2008.
[6] SEYEDPOOR S M. A two-stage method for structural damage detection using a modal strain energy based index and particle swarm optimization[J]. International Journal of Non-Linear Mechanics, 2012, 47(1):1-8.
[7] LI JING, WU BAISHENG, ZENG Q C, et al. A generalized flexibility matrix based approach for structural damage detection[J]. Journal of Sound and Vibration,2010, 329(22):4583-4587.
[8] HOLLAND J H. Adaption in natural and artificial systems[M]. Massachusetts:MIT Press, 1975.
[9] SRINIVAS M, PATNAIK L M. Adaptive probabilities of crossover and mutation in genetic algorithms[J]. IEEE Transactions on System, Man and Cybernetics, 1994, 24(4):656-667.
[10]陈家照,毛行.火箭蒙皮上L型梁的损伤识别方法的研究[J].噪声与振动控制,2017,37(Z1):694-698.