含损伤板的动载荷识别精度研究
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摘要
为了深入研究动载荷识别问题,改善识别精度受测点信息和传感器布置数目限制的影响。首先采用逆问题正分析的方法,在时域正演法识别的理论基础上,研究结构损伤对载荷识别结果的影响,然后分析讨论测点位置、采样时间间隔对识别精度的影响。结果表明,在板结构有损伤的情况下,该方法能有效地识别出非损伤处的载荷且计算效率较高,但对于损伤处载荷的识别精度较低。另外,通过优化传感器的布置以及选择合适的采样时间间隔,可较大程度提高识别精度,为载荷识别的准确性提供参考。
The problem of dynamic load identification is studied.The influence of the identification information,the number of sensors and the layout of the sensors on the accuracy of the identification is analyzed.Firstly,the influence of the damage on the load recognition results is studied on the basis of the theory of time domain forward method.Then,the influence of the position of the measurement points and the sampling time interval on the recognition accuracy is analyzed.The results show that this method can effectively identify the load of the non-damaged location,but the accuracy of identification for the damaged location is low.By optimizing the arrangement of the sensor and selecting the appropriate sampling time interval,the recognition accuracy can be greatly improved.This work may provide a reference for raising the accuracy of load identification.
The problem of dynamic load identification is studied.The influence of the identification information,the number of sensors and the layout of the sensors on the accuracy of the identification is analyzed.Firstly,the influence of the damage on the load recognition results is studied on the basis of the theory of time domain forward method.Then,the influence of the position of the measurement points and the sampling time interval on the recognition accuracy is analyzed.The results show that this method can effectively identify the load of the non-damaged location,but the accuracy of identification for the damaged location is low.By optimizing the arrangement of the sensor and selecting the appropriate sampling time interval,the recognition accuracy can be greatly improved.This work may provide a reference for raising the accuracy of load identification.
引文
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[13]Q ZHANG,?JANKOWSKI,Z DUAN.Identification of coexistent load and damage[J].Structural and Multidisciplinary Optimization,2010,41(2):243-253.
[2]Y DING,S LAW,B WU,et al.Average acceleration discrete algorithm for force identification in state space[J].Engineering Structures,2013(56):1880-1892.
[3]伍乾坤,韩旭,刘杰,等.一种直接求解的动态载荷识别方法[J].应用力学学报,2011(2):201-205+218.
[4]Z SHARIF-KHODAEI,M GHAJARI,M ALIABADI.Determination of impact location on composite stiffened panels[J].Smart Materials and Structures,2012,21(10):105026.
[5]祝德春,张方,姜金辉.动态载荷激励位置识别技术研究[J].振动与冲击,2012,(01):20-23+48.
[6]J F DOYLE.A wavelet deconvolution method for impact force identification[J].Experimental Mechanics,1997,37(4):403-408.
[7]初良成.动态载荷识别的时域正演方法[J].应用力学学报,1994,11(2):xxx-xxx.
[8]周盼,张权,率志君,等.动载荷识别时域方法的研究现状与发展趋势[J].噪声与振动控制,2014,34(1):6-11.
[9]M S ALLEN,T G CARNE.Delayed,multi-step inverse structural filter for robust force identification[J].Mechanical Systems and Signal Processing,2008,22(5):1036-1054.
[10]毛玉明,郭杏林,赵岩,等.基于灵敏度分析的结构动态载荷识别研究[J].振动与冲击,2010,29(10):1-3+247.
[11]Y LAGE,N MAIA,M NEVES,et al.Force identification using the concept of displacement transmissibility[J].Journal of Sound and Vibration,2013,332(7):1674-1686.
[12]X LI,Z DENG.Identification of dynamic loads based on second-order taylor-series expansion method[J].Shock and Vibration,2016:1-9.
[13]Q ZHANG,?JANKOWSKI,Z DUAN.Identification of coexistent load and damage[J].Structural and Multidisciplinary Optimization,2010,41(2):243-253.