运用改进的D-S进行钢管焊接结构损伤识别
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摘要
为了有效利用结构健康诊断中的多源不确定数据,提高损伤识别的准确率,通过改进D-S证据理论(Dempster提出由Shafer完善形成的一种推理理论)中的基本概率赋值函数和组合规则,提出了一种基于改进D-S证据理论的结构损伤识别新方法。该方法利用灰色关联理论和熵权理论处理信息源的基本概率赋值问题,利用改进的D-S组合规则处理信息源间的相关、冲突问题。通过钢管焊接结构的试验研究验证所提方法的有效性,结果表明所提出的方法优于传统的D-S损伤识别方法;相对于单一损伤信息的损伤识别而言,基于多源损伤信息能够有效降低损伤误判的可能性,获得更准确的损伤识别结果。
In order to make full use of multi-resource and uncertain data and to improve the damage identification accuracy of the objective from structural health diagnosis,a new damage identification method based on improved DS evidence theory are proposed in this paper via improving the basic belief assignment functions and compound rule.This method deals the basic probability assignment by the entropy weight coefficient and grey incidence analysis,and solves the problem of related or conflicting evidences by improved D-S compound rules.A steel tube welded structure is utilized to validate this proposed method.Results show that the method presented in this paper is superior to the classical D-S fusion theory.And in comparison to the single damage assessment method,more reliable identification results can be obtained by the proposed algorithm.
In order to make full use of multi-resource and uncertain data and to improve the damage identification accuracy of the objective from structural health diagnosis,a new damage identification method based on improved DS evidence theory are proposed in this paper via improving the basic belief assignment functions and compound rule.This method deals the basic probability assignment by the entropy weight coefficient and grey incidence analysis,and solves the problem of related or conflicting evidences by improved D-S compound rules.A steel tube welded structure is utilized to validate this proposed method.Results show that the method presented in this paper is superior to the classical D-S fusion theory.And in comparison to the single damage assessment method,more reliable identification results can be obtained by the proposed algorithm.
引文
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[10]李忠献,齐怀展,朱劲松.基于模态曲率法的大跨度斜拉桥损伤识别[J].地震工程与工程振动,2007,27(4):122-126.LI Zhongxian,QI Huaizhan,ZHU Jingsong.Damage identification for long 2 span cable2stayed bridge based on modal curvature method[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(4):122-126.(in Chinese)
[2]Ying fang Cao.Bayesian based structural health management and reliability analysis techniques utilizing support vector machine[D].North Caro-lina:North Carolina State University,2007.
[3]刘涛,李爱群,缪长青,等.基于数据融合的结构损伤识别方法研究[J].工程力学,2008,25(1):16-21.LIU Tao,LI Aiqun,MIAO Changqing,et al.Study of structural damage identification methods based on data fusion[J].Engineering Mechanics,2008,25(1):16-21.(in Chinese)
[4]卢伟.基于现场总线的大跨空间结构健康监测系统研究[D].哈尔滨:哈尔滨工业大学,2010.LU Wei.The structural health monitoring system of large span space structure based on Fieldbus[D].Harbin:Harbin Institute of Technology,2010.(in Chinese)
[5]姜绍飞,张帅.基于模糊神经网络和证据理论的结构损伤识别新方法[J].地震工程与工程振动,2008,28(4):139-145.JIANG Shaofei,ZHANG Shuai.A new structural damage identification method based on fuzzy neural network and evidential theory[J].Journal ofEarthquake Engineering and Engineering Vibration,2008,28(4):139-145.(in Chinese)
[6]安学利,周建中,刘力,等.基于熵权理论和信息融合技术的水电机组振动故障诊断[J].电子系统自动化,2008,32(20):78-82.AN Xueli,ZHOU Jianzhong,LIU Li,et al.Vibration fault diagnosis for hydraulic generator units based on entropy weight theory and information fu-sion technology[J].Automation of Electric Power Systems,2008,32(20):78-82.(in Chinese)
[7]李世龙.某型导弹发射台机械结构损伤识别研究[D].石家庄:军械工程学院,2011.LI Shilong.Damage detection research for the mechanical structure of a certain missile launch platform[D].Shijiazhuang:Mechanical EngineeringCollege,2011.(in Chinese)
[8]李忠献,杨晓明,丁阳.应用人工神经网络技术的大型斜拉桥子结构损伤识别研究[J].地震工程与工程振动,2003,23(3):92-99.Ll Zhongxian,YANG Xiaoming,DING Yang.Research on substructural damage identification of large cable-stayed bridges using artificial neuralnetworks[J].Journal of Earthquake Engineering and Engineering Vibration,2003,23(3):92-99.(in Chinese)
[9]曹晖,张新亮,李英民.利用模态柔度曲率差识别框架的损伤[J].振动与冲击,2007,26(6):116-124.CAO Hui,ZHANG Xinliang,LI Yingmin.Damage evaluation of frames by modal flexibility curvature[J].Journal of Vibration and Shock,2007,26(6):116-124.(in Chinese)
[10]李忠献,齐怀展,朱劲松.基于模态曲率法的大跨度斜拉桥损伤识别[J].地震工程与工程振动,2007,27(4):122-126.LI Zhongxian,QI Huaizhan,ZHU Jingsong.Damage identification for long 2 span cable2stayed bridge based on modal curvature method[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(4):122-126.(in Chinese)
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