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Comprehensive-comparison-of-macro-strain-mode-and-displacement.pdf

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Comprehensive-comparison-of-macro-strain-mode-and-displacement

Contents lists available at ScienceDirect Mechanical Systems and Signal Processing Mechanical Systems and Signal Processing 50-51 (2015) 563–579http://d 0888-32 n Corr Tel./fax: E-mjournal homepage: /locate/ymsspComprehensive comparison of macro-strain mode and displacement mode based on different sensing technologies Wan Hong b, Jian Zhang a,b, Gang Wu a,b, Zhishen Wu a,b,n a Key Laboratory of CPC Structures of the Ministry of Education, Southeast University, Nanjing 210096, China b International Institute for Urban System Engineering, Southeast University, Nanjing 210096, Chinaa r t i c l e i n f o Article history: Received 17 June 2013 Received in revised form 16 December 2013 Accepted 8 May 2014 Available online 28 May 2014 Keywords: Distributed sensing Measurement error Macro-strain mode Displacement mode Structural health /10.1016/j.ymssp.2014.05.011 70/ 2014 Elsevier Ltd. All rights reserved. esponding author at: Key Laboratory of CP t86 258 379 3232. ail address: zswu@ (Z. Wu).a b s t r a c t A comprehensive comparison of macro-strain mode and displacement mode obtained from distributed macro-strain sensing and high-density point sensing (such as accel- erometers) technologies is presented in this paper. Theoretical derivation reveals that displacement mode shape from accelerometers and modal macro-strain from distributed macro-strain sensors can be converted into each other. However, it is realized that displacement mode shape as global behavior of a structure can still be calculated with high-precision from modal macro-strain considering measurement errors in practical monitoring, whereas modal macro-strain can hardly be accurately achieved from displacement mode shape when signals are corrupted with noise in practical monitoring. Simulation and experiment results show that the calculated displacement mode shapes are very close to the actual ones even if the noise level reaches 5%. Meanwhile, damage index using measured modal macro-strain is still effectiv