一种基于频率响应曲率的损伤检测多步判定方法
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摘要
在频率响应曲率指标基础上,提出了一种多步的检测方法,使用少量的传感器进行多步判定,来提高损伤定位的准确性和可靠性。通过简支梁的有限元数值算例,详细比较了改进的模态曲率方法、改进的柔度曲率方法和该文提出的方法对梁状多损伤结构的识别效果和抗噪能力。最后采用试验建模的技术,对局部减薄的多损伤管道和局部裂纹的单损伤管道进行损伤识别试验,结果验证了该方法的优越性,对解决实际工程结构的损伤检测问题具有一定的意义。
a multi-step decision method for structural damage detection based on frequency response curvature using a few sensors is presented to improve detection accuracy and reliability.Numerical example of multi-damaged simply-supported beam is used to illustrate the validity of the presented method.The efficiencies and antinoise abilities of three improved methods(improved modal curvature method,improved flexibility curvature method and the proposed method) are analyzed and compared in detail.Finally experimental examples of a multi-damaged pipeline with local reduction and a single-damaged pipeline with local crack based on experimental model are preformed to verify the correctness and feasibility of the proposed method.The results show that the proposed method worked well for the damage detection and the assessments are in good agreement with the actual condition,which is meaningful in the application to damage detection in engineering structure.
a multi-step decision method for structural damage detection based on frequency response curvature using a few sensors is presented to improve detection accuracy and reliability.Numerical example of multi-damaged simply-supported beam is used to illustrate the validity of the presented method.The efficiencies and antinoise abilities of three improved methods(improved modal curvature method,improved flexibility curvature method and the proposed method) are analyzed and compared in detail.Finally experimental examples of a multi-damaged pipeline with local reduction and a single-damaged pipeline with local crack based on experimental model are preformed to verify the correctness and feasibility of the proposed method.The results show that the proposed method worked well for the damage detection and the assessments are in good agreement with the actual condition,which is meaningful in the application to damage detection in engineering structure.
引文
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[13]高维成,刘伟,钱成.基于剩余模态力和模态应变能理论的网架结构损伤识别[J].工程力学,2007,24(5):93―100.Gao Weicheng,Liu Wei,Qian Cheng.Damage detectionof space truss using residual modal force and modalstrain energy[J].Engineering Mechanics,2007,24(5):93―100.(in Chinese)
[14]刘涛,李爱群,赵大亮,丁幼亮.改进模态应变能法在混凝土组合箱梁桥损伤诊断中的应用[J].工程力学,2008,25(6):44―50.Liu Tao,Li Aiqun,Zhao Daliang,Ding Youliang.Improved modal-strain-energy damage detection methodand its application in concrete composite box beambridges[J].Engineering Mechanics,2008,25(6):44―50.(in Chinese)
[2]Pandey A K,Biswas M,Samman M M.Damagedetection from changes in curvature mode shapes[J].Journal of Sound and Vibration,1991,145(2):321―332.
[3]Stubbs N,Kim J T,Topole K.An efficient and robustalgorithm for damage localization in offshore platforms[C]//Proceedings of the ASCE Tenth StructuresCongress,San Antonio,Texas,1992:543―546.
[4]David V J,Charles R F.Comparison of damageidentification algorithm on experimental modal data froma bridge[C]//Dominick J DeMichele,Union College.Proceedings of the Thirteenth International ModalAnalysis Conference.Dearborn,USA,1996:1423―1429.
[5]Salawu O S,Williams C.Damage location usingvibration mode shapes[C]//Dominick J DeMichele,Union College.Proceedings of the Twelfth InternationalModal Analysis Conference,Hawaii,USA,1994:933―939.
[6]Wahab M M A,Roeck G D.Damage detection in bridgesusing modal curvatures:application to a real damagescenario[J].Journal of Sound and Vibration,1999,226(2):217―235.
[7]Raghavendrachar M,Aktan A E.Flexibility bymultireference impact testing for bridge diagnostics[J].Journal of Structural Engineering,1992,118(8):2186―2203.
[8]Pandey A K,Biswas M.Damage detection in structureusing changes in flexibility[J].Journal of Sound andVibration,1994,169(1):3―17.
[9]曹晖,Michael I Friswell.基于模态柔度曲率的损伤检测方法[J].工程力学,2006,23(4):33―38.Cao Hui,Michael I Friswell.Nondestructive damageevaluation indicator based on model flexibility curvature[J].Engineering Mechanics,2006,23(4):33―38.(inChinese)
[10]Sampaio R P C,Maia N M M,Silva J M M.Damagedetection using the frequency-response-functioncurvature method[J].Journal of Sound and Vibration,1999,226(5):1029―1042.
[11]汪之松,郭惠勇,李正良.基于频率响应的不同结构损伤识别方法研究[J].工程力学,2008,25(6):6―13.Wang Zhisong,Guo Huiyong,Li Zhengliang.Identification methods for different structural damagebased on frequency response[J].Engineering Mechanics,2008,25(6):6―13.(in Chinese)
[12]曹晖,林秀萍.结构损伤识别中噪声的模拟[J].振动与冲击,2010,29(5):106―109.Cao Hui,Lin Xiuping.Noise simulation in structuraldamage identification[J].Journal of Vibration and Shock,2010,29(5):106―109.(in Chinese)
[13]高维成,刘伟,钱成.基于剩余模态力和模态应变能理论的网架结构损伤识别[J].工程力学,2007,24(5):93―100.Gao Weicheng,Liu Wei,Qian Cheng.Damage detectionof space truss using residual modal force and modalstrain energy[J].Engineering Mechanics,2007,24(5):93―100.(in Chinese)
[14]刘涛,李爱群,赵大亮,丁幼亮.改进模态应变能法在混凝土组合箱梁桥损伤诊断中的应用[J].工程力学,2008,25(6):44―50.Liu Tao,Li Aiqun,Zhao Daliang,Ding Youliang.Improved modal-strain-energy damage detection methodand its application in concrete composite box beambridges[J].Engineering Mechanics,2008,25(6):44―50.(in Chinese)
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