A Conceptual Structural Health Monitoring System based on Vibration and Wave Propagation

Abstract

Development of efficient methodologies to determine the presence, location, and severity of hidden damage in critical structural components is an important task in the design and construction of structural health monitoring systems in aging as well as new structures. In this article, a methodology for automatic damage identification and localization is presented. The structure is assumed to be instrumented with an array of actuators and sensors to excite and record its dynamic response, including vibration and wave propagation effects. In the vibrational approach, the data consist of the modal response of the structure produced by the actuators while in the wave propagation approach, they are the broadband signals due to ultrasonic waves propagating in the structures. Both types of signals are affected by the presence of defects. The approximate location and severity of an unknown defect is determined using a damage correlation index calculated from the frequency response function (FRF) of the structure. The damage index is a relative measure whose value depends on the differences in the dynamical properties of the undamaged (baseline) and damaged structures. The method is applied to simple structural components involving aluminum beams and plates with reduced local stiffness and a composite plate with impact damage. The potential application of the technique to practical health monitoring problems is discussed.

Keywords

structural health monitoring hidden defect damage index frequency response ultrasonic wave aluminum composite laminate

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References

Scott, W.D. , Farrar, R.F. , Prime, M.B. and Shevitz, D.W. (1996). Damage identification and health monitoring of structural and mechanical systems for changes in their vibration characteristics: a literary review. Technical Report, LA-13070-MS, UC-900, Los Alamos National Laboratory, USA .

Chen, J.Y. , Sharpe, Jr., L. and Jonkowsky, A.L. (1998). An overview of the vibrational-based nondestructive evaluation techniques . In: Geithman, G.A. and Georgeson, G.E. (eds), Proceedings of SPIE, Vol. 3397, pp. 117-128 , San Antonio, TX, March 31-April 2.

Maia, N.M.M. and Silva, M.J.M. (eds) (1997). Theoretical and Experimental Modal Analysis. Mechanical Engineering Research Studies, Engineering Dynamics Series, Vol. 9, Research Studies Press, New York: Wiley .

Ndambi, J.M. , Vantomme, J. and Harri, K. (2002). Damage assessment in reinforced concrete beam using eigenfrequencies and mode shape derivatives . Engineering Structures, 24, 501-515 .

Kim, J.T. and Stubbs, N. (2002). Improved damage identification method based on modal information . Journal of Sound and Vibration, 252(2), 223-238 .

Kessler, S.S. , Spearing, S.M. , Atalla, M.J. , Cesnik, C.E.S. and Soutis, C. (2002). Damage detection in composite materials using frequency response methods . Composites Part B, 33, 87-95 .

Monaco, E. , Franco, F. and Lecce, L. (2000). Experimental and numerical activities on damage detection using magnetostrictive actuators and statistical analysis . Journal of Intelligent Material Systems and Structures, 11, 567-578 .

Rose, J.L. (1999). Ultrasonic Waves in Solid Media. Cambridge University Press, New York, NY .

Park, J. and Chang, F.K. (2003). Built-in detection of impact damage in multi-layered thick composite structures . In: Chang, F.-K. (ed.), Proc. of the 4th Int. Workshop on Structural Health Monitoring, pp. 1391-1398 , Stanford, CA, September 15-17.

10.

Giurgiutiu, V. and Yu, L. (2003). Comparison of short-time fourier transform and wavelet transform of transient and tone burst wave propagation signals for structural health monitoring . In: Chang, F.-K. (ed.), Proc. of the 4th Int. Workshop on Structural Health Monitoring, pp. 1267-1284 , Stanford, CA, September 15-17.

11.

Haugse, E. , Leeks, T.J. , Ikegami, R. , Johnson, P.E. , Ziola, S.M. , Doroghi, J.F. , May, S. and Phelps, N. (1999). Crack growth detection and monitoring using broadband acoustic emission technique . In: Mal, A.K. (ed.), Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, Proceedings of SPIE, Vol. 3586, pp. 32-40 , Newport Beach, CA, March 3-5.

12.

Guo, D. , Mal, A.K. , and Ono, K. (1996). Wave theory of acoustic emission in composite laminates . J. Acoust. Emission, 14, S19-S46 .

13.

Chang, Z. and Mal, A.K. (1998). Wave propagation in a plate with defects. In: Chimenti, D.E. (ed.), Review of Progress in QNDE, Vol. 17, pp. 121-128.

14.

Shih, J.H. and Mal, A.K. (2000). Acoustic emission from impact damage in cross-ply composites . In: Chang, F.-K. (ed.), Proc. of the 2nd Int. Workshop on Structural Health Monitoring, pp. 209-217 , Stanford, CA.

15.

Mal, A.K. , Shih, J.H. and Banerjee, S. (2003). Acoustic emission waveforms in composite laminates under low velocity impact . In: T. Kundu (ed.) Proc. SPIE Conference on Smart NDE for Health Monitoring of Structural and Biological Systems, Vol. 5047, pp. 1-12 , San Diego, CA, March 3-5.