Vibration-Based Crack Detection in L-Frames

Abstract:

This paper presents a novel non-destructive method to locate and size damages in frame structures, performed by examining and interpreting changes in measured vibration response. The method bases on a relation, prior contrived by the authors, between the strain energy distribution in the structure for the transversal vibration modes and the modal changes (in terms of natural frequencies) due to damage. Using this relation a damage location indicator DLI was derived, which permits to locate cracks in spatial structures. In this paper an L-frame is considered for proving the applicability of this method. First the mathematical expressions for the modes shapes and their derivatives were determined and simulation result compared with that obtained by finite element analysis. Afterwards patterns characterizing damage locations were derived and compared with measurement results on the real structure; the DLI permitted accurate localization of any crack placed in the two structural elements.

• Periodical: Applied Mechanics and Materials (Volume 658)
• Pages: 261-268
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.658.261
• Online since: October 2014
• Authors: Jean Louis Ntakpe, Gilbert Rainer Gillich, Florian Muntean, Zeno Iosif Praisach, Peter Lorenz
• Keywords: Damage Detection, Finite Element Method (FEM), Frame, Frequency, Modal Analysis

References

[1] A. Morassi, F. Vestroni, Dynamic Methods for Damage Detection in Structures, Springer, (2008).

[2] S. W. Doebling, C. R. Farrar, M. B. Prime, D. Shevitz, Damage Identification and Health Monitoring of Structural and Mechanical Systems From Changes in their Vibration Characteristics: A literature Review, Los Alamos National Laboratory Report LA-13070-MS, (1996).

DOI: 10.2172/249299

[3] J. Kullaa, Distinguishing between sensor fault, structural damage, and environmental or operational effects in structural health monitoring, Mechanical Systems and Signal Processing, 25 (2011) 2976–2989.

DOI: 10.1016/j.ymssp.2011.05.017

[4] G. -R. Gillich, Z. Praisach, D.M. Onchis, About the effectiveness of damage detection methods based on vibration measurements, International Conference on Engineering Mechanics, Structures, Engineering Geology, International Conference on Geography and Geology - Proceedings, 2010, pp.204-209.

[5] G. Park, H. Sohn, C. R. Farrar, D. J. Inman, Overview of Piezoelectric Impedance-Based Health Monitoring and Path Forward, Shock and Vibration Digest, 35 (2003) 451–463.

DOI: 10.1177/05831024030356001

[6] H. Guo, G. Xiao, N. Mrad, J. Yao, Fiber Optic Sensors for Structural Health Monitoring of Air Platforms, Sensors, 11 (2011) 3687-3705.

DOI: 10.3390/s110403687

[7] J.V. Araújo dos Santos, N.M.M. Maia, C.M. Mota Soares, C.A. Mota Soares, Structural Damage Identification: A Survey, in: B.H.V. Topping, M. Papadrakakis (Eds. ), Trends in Computational Structures Technology, Saxe-Coburg Publications, Stirlingshire, 2008, pp.1-24.

DOI: 10.4203/csets.19.1

[8] Y. -Z. Song, C.R. Bowen, H.A. Kim, A. Nassehi, J. Padget, N. Gathercole, A., Non-invasive damage detection in beams using marker extraction and wavelets, Mech. Syst. Signal Process. (2014).

DOI: 10.1016/j.ymssp.2013.12.011

[9] S.W. Doebling, C.R. Farrar, M.B. Prime, A summary review of vibration-based damage identification methods, Shock and Vibration Digest, 30 (1998) 91-105.

DOI: 10.1177/058310249803000201

[10] M.I. Friswell, Damage identification using inverse methods, Phil. Trans. R. Soc. A, 365 (2007) 393-410.

[11] A. Rytter, Vibration based inspection of civil engineering structures. Ph.D. Thesis, Aalborg University, Denmark, (1993).

[12] G.R. Gillich, Z.I. Praisach, Robust method to identify damages in beams based on frequency shift analysis, Proceedings of SPIE - The International Society for Optical Engineering 8348, San Diego, art. no. 83481D, (2012).

DOI: 10.1117/12.915158

[13] G.R. Gillich, Z.I. Praisach, Damage-patterns based method to locate discontinuities in beams, Proceedings of SPIE - The International Society for Optical Engineering 8695, art. no. 869532, (2013).

DOI: 10.1117/12.2009122

[14] P.F. Minda, Z.I. Praisach, N. Gillich, A.A. Minda, G.R. Gillich, On the efficiency of different dissimilarity estimators used in damage detection, Romanian Journal of Acoustics and Vibration, 10 (2013) 15-18.

DOI: 10.4028/www.scientific.net/amm.430.84