To reduce time and cost of damage inspection, on-line impact monitoring of aircraft composite structures is needed. A digital monitor based on an array of piezoelectric transducers (PZTs) is developed to record the impact region of impacts on-line. It is small in size, lightweight and has low power consumption, but there are two problems with the impact alarm region localization method of the digital monitor at the current stage. The first one is that the accuracy rate of the impact alarm region localization is low, especially on complex composite structures. The second problem is that the area of impact alarm region is large when a large scale structure is monitored and the number of PZTs is limited which increases the time and cost of damage inspections. To solve the two problems, an impact alarm region imaging and localization method based on digital sequences and time reversal is proposed. In this method, the frequency band of impact response signals is estimated based on the digital sequences first. Then, characteristic signals of impact response signals are constructed by sinusoidal modulation signals. Finally, the phase synthesis time reversal impact imaging method is adopted to obtain the impact region image. Depending on the image, an error ellipse is generated to give out the final impact alarm region. A validation experiment is implemented on a complex composite wing box of a real aircraft. The validation results show that the accuracy rate of impact alarm region localization is approximately 100%. The area of impact alarm region can be reduced and the number of PZTs needed to cover the same impact monitoring region is reduced by more than a half.
References
[1]
Staszewski, W.J.; Mahzan, S.; Traynor, R. Health monitoring of aerospace composite structures-active and passive approach. Compos. Sci. Technol. 2009, 69, 1678–1685.
[2]
Staszewski, W.J.; Boller, C.; Tomlinson, G.R. Health Monitoring of Aerospace Structure; John Wiley and Sons, Inc.: The Atrium, Southern Gate, Chichester, West Sussex, UK, 2004.
[3]
Qing, X.L.; Beard, S.J.; Kumar, A.; Ooi, T.K.; Chang, F.K. Built-in sensor network for structural health monitoring of composite structure. J. Intell. Mater. Syst. Struct. 2007, 18, 39–49.
[4]
Yuan, S.F.; Liang, D.K.; Shi, L.H.; Zhao, X.; Wu, J.; Li, G.; Qiu, L. Recent progress on distributed structural health monitoring research at NUAA. J. Intell. Mater. Syst. Struct. 2008, 19, 373–386.
[5]
Staszewski, W.J.; Mahzan, S.; Traynor, R. Health monitoring of aerospace composite structures-active and passive approach. Compos. Sci. Technol. 2009, 69, 1678–1685.
[6]
Markmiller, J.F.C.; Chang, F.G. Sensor network optimization for a passive sensing impact detection technique. Struct. Health Monit. 2010, 9, 25–39.
[7]
Bernard, K.F. Knowledge-based support in Non-Destructive Testing for health monitoring of aircraft structures. Adv. Eng. Inf. 2012, 26, 859–869.
[8]
Kundu, T.; Das, S.; Jata, K.V. Detection of the point of impact on a stiffened plate by the acoustic emission technique. Smart Mater. Struct. 2009, 18, 035006.
[9]
Ciampa, F.; Meo, M. Acoustic emission source localization and velocity determination of the fundamental mode A0 using wavelet analysis and Newton-based optimization technique. Smart Mater. Struct. 2010, 19, 1–14.
[10]
Hajzargarbashi, T.; Kundu, T.; Bland, S. An improved algorithm for detecting point of impact in anisotropic inhomogeneous plates. Ultrasonics 2011, 51, 317–324.
[11]
Kundu, T.; Nakatani, H.; Takeda, N. Acoustic source localization in anisotropic plates. Ultrasonics 2012, 52, 740–746.
[12]
Ciampa, F.; Meo, M.; Barbieri, E. Impact localization in composite structures of arbitrary cross section. Struct. Health Monit. 2012, 11, 643–655.
[13]
Perelli, A.; de Marchi, L.; Marzani, A.; Speciale, N. Acoustic emission localization in plates with dispersion and reverberations using sparse PZT sensors in passive mode. Smart Mater. Struct. 2012, 21, 025010.
[14]
Hall, J.S.; Michaels, J.E. Adaptive dispersion compensation for guided wave imaging. AIP Conf. Proc. 2012, 1430, 623–630.
[15]
LeClerc, R.; Worden, K.; Staszewski, W.J.; Haywood, J. Impact detection in an aircraft composite panel—A neural-network approach. J. Sound Vib. 2007, 299, 672–682.
[16]
Mujica, L.E.; Vehí, J.; Staszewski, W.J.; Haywood, J. Impact damage detection in aircraft composites using knowledge-based reasoning. Struct. Health Monit. 2008, 7, 215–230.
[17]
Yan, G.; Zhou, L. Impact load identification of composite structure using genetic algorithms. J. Sound Vib. 2009, 319, 869–884.
[18]
Hu, N.; Fukunaga, H.; Matsumoto, S.; Yan, B.; Peng, X.H. An efficient approach for identifying impact force using embedded piezoelectric sensors. Int. J. Impact Eng. 2007, 34, 1258–1271.
[19]
Sharif-Khodaei, Z.; Ghajari, M.; Aliabadi, M.H. Determination of impact location on composite stiffened panels. Smart Mater. Struct. 2012, 21, 105026.
[20]
Matt, H.; di Scalea, F.L. Macro-fiber composite piezoelectric rosettes for acoustic source location in complex structures. Smart Mater. Struct. 2007, 16, 064.
[21]
Baravelli, E.; Senesi, M.; Ruzzene, M.; de Marchi, L.; Speciale, N. Double-channel, frequency-steered acoustic transducer with 2-D imaging capabilities. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 2011, 58, 1430–1441.
[22]
Ing, R.K.; Quieffin, N.; Cathelinea, S.; Fink, M. In solid localization of finger impacts using acoustic time-reversal process. Appl. Phys. Lett. 2005, 87, 204104:1–204104:3.
[23]
Ribay, G.; Catheline, S.; Clorennec, D.; Ing, R.K.; Queffin, N.; Fink, M. Acoustic impact localization in plates: Properties and stability to temperature variation. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 2007, 54, 378–385.
[24]
Chen, C.; Yuan, F.G. Impact source identification in finite isotropic plates using a time-reversal method: theoretical study. Smart Struct. Mater. 2010, 19, 105028.
[25]
Qiu, L.; Yuan, S.F. A phase synthesis time reversal impact imaging method for on-line composite structure monitoring. Smart Struct. Syst. 2011, 8, 303–320.
[26]
Qiu, L.; Yuan, S.F.; Zhang, X.; Wang, Y. A time reversal focusing based impact imaging method and its application on an aircraft wing box. Smart Mater. Struct. 2011, 20, 105014.
[27]
Chen, C.; Li, Y.; Yuan, F.G. Impact source identification in finite isotropic plates using a time-reversal method: Experimental study. Smart Mater. Struct. 2012, 21, 105025.
[28]
Meo, M.; Ciampa, F. Impact detection in anisotropic materials using a time reversal approach. Struct. Health Monit. 2011, 11, 43–49.
[29]
Park, B.; Sohn, H.; Olson, S.E.; deSimio, M.P.; Brown, K.S.; Derriso, M.M. Impact localization in complex structures using laser-based time reversal. Struct. Health Monit 2012, doi:10.1177/1475921712449508.
[30]
Acellent: A Structural Health Monitoring Company. Available online: http://64.105.143.179/Hardware.asp (accessed on 30 September 2013).
[31]
Qiu, L.; Yuan, S.F.; Wang, Q.; Sun, Y.J.; Yang, W.W. Design and experiment of PZT network-based structural health monitoring scanning system. Chin. J. Aeronaut. 2009, 22, 505–512.
[32]
Qiu, L.; Yuan, S.F. On development of a multi-channel PZT array scanning system and its evaluating application on UAV wing box. Sens. Actuators A Phys. 2009, 151, 220–230.
[33]
Lhn, J.B.; Chang, F. Pitch-catch active sensing methods in structural health monitoring for aircraft structures. Struct. Health Monit. 2008, 7, 5–15.
[34]
Qing, X.; Beard, S.J.; Shen, S.B.; Banerjee, S.; Bradley, I.; Salama, M.M.; Chang, F.K. Development of a real-time active pipeline integrity detection system. Smart Mater. Struct. 2009, 11, 115010. (already checked, pls confirm.
[35]
Metis Design Corporation. A Structural Health Monitoring Company. Available online: http://www.metisdesign.com/structural-health-monitoring-company/md7-digital.html (accessed on 30 September 2013).
[36]
Perelli, A.; Caione, C.; de Marchi, L.; Brunelli, D.; Marzani, A.; Benini, L. Design of An Ultra-Low Power Device for Aircraft Structural Health Monitoring. Proceedings of the Conference on Design, Automation and Test in Europe, Grenoble, France, 18–22 March 2013; pp. 1127–1130.
[37]
Yuan, S.F.; Liu, P.P.; Qiu, L. A miniaturized composite impact monitor and its evaluation research. Sens. Actuators A Phys. 2012, 184, 182–192.
[38]
Liu, P.P.; Yuan, S.F.; Qiu, L. Development of a PZT-based wireless digital monitor for composite impact monitoring. Smart Mater. Struct. 2012, 21, 035018.
[39]
Fink, M. Time-reversal of ultrasonic field—Part I: Basic principles. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 1992, 39, 555–566.
[40]
Qiu, L.; Yuan, S.F. Design of an all-digital impact monitoring system for large scale composite structures. IEEE Trans. Instrum. Meas. 2013, 62, 1990–2002.
[41]
Chang, F.K. Structural Health Monitoring, System Health Management;; John Wiley and Sons, Inc.: New York, NY, USA, 2001.
