Publisher : The Korean Society for Noise and Vibration Engineering
DOI : 10.5050/KSNVE.2016.26.2.172
Title & Authors
The Effect of the Number of Vibration Modes on the Application of the Location Template Matching(LTM) Method Shin, Kihong;
The location template matching (LTM) method is a technique of identifying an impact location on a structure, and is often applied to structural health monitoring and large scale human-computer interface (HCI) systems. The LTM method utilizes a certain measure of similarity between two time signals. The correlation coefficient is most widely used for this purpose, and the group delay based method is recently proposed to improve the accuracy of finding the best matching pair of signals. In practice, one of key essential consideration for implementing the LTM method is to guarantee that a sufficient number of vibration modes must be contained in the measured signal, and yet the lower sampling rate is needed for a real-time implementation. In this paper, the properties of correlation coefficient and group delay with respect to the number of vibration modes are investigated. A few important results are obtained through extensive computer simulations and experiments. If the number of vibration modes contained in the measured signal is more than four it is sufficient for the correlation based LTM method, while the group delay based LTM method requires smaller number of vibration modes.
Ing, R. K., Quieffin, N., Catheline, S. and Fink, M., 2005, In Solid Localization of Finger Impacts Using Acoustic Time-reversal Process, Applied Physics Letters, Vol. 87, No. 20, pp. 204104.
Paradiso, J. A., Hsiao, K., Strickon, J., Lifton, J. and Adler, A., 2000, Sensor Systems for Interactive Surfaces, IBM Systems Journal. Vol. 39, No. 3&4, pp. 892~914.
Pham, D. T., Al-Kutubi, M., Ji, Z., Yang, M., Wang, Z. and Catheline, S., 2005, Tangible Acoustic Interface Approaches, Proceedings of IPROMS 2005 Virtual Conference, pp. 497-502.
Sulaiman, A., Poletkin, K. and Khong, A. W. H., 2010, Source Localization in the Presence of Dispersion for Next Generation Touch Interface, 2010 International Conference on Cyberworlds (CW), pp. 82-86.
Yap, X., Khong, A. W. H. and Gan, W. S., 2010, Localization of Acoustic Source on Solids: A Linear Predictive Coding based Algorithm for Location Template Matching, 2010 IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), pp. 2490-2493.
Arun, K. R., Yap, X. and Khong, A. W. H., 2011, A Touch Interface Exploiting Time-Frequency Classification Using Zak Transform for Source Localization on Solids, IEEE Transactions on Multimedia, Vol. 13, No. 3, pp. 487~497.
Yang, H., Lee, S. K. and Shin, K., 2012, On the Practical Consideration of Source Localization Using the Location Template Matching (LTM) with Multiple Sensors, Applied Mechanics and Materials, Vol. 157-158, pp. 441~446.
Shin, K., Yang, H., Lee, S. K. and Lee, Y. S., 2013, Group Delay Based Location Template Matching Method for the Identification of the Impact Location on a Plate, Journal of Sound and Vibration, Vol. 332, No. 8, pp. 2111~2117.
Shin, K., 2014, Comparative Study on the Measures of Similarity for the Location Template Matching(LTM) Method, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 24, No. 4, pp. 310~316.
Shin, K. and Hammond, J. K., 2008, Fundamentals of Signal Processing for Sound and Vibration Engineers, Wiley, Chichester.
Fahy, F. and Gardonio, P., 2007, Sound and Structural Vibration: Radiation, Transmission and Response, Second Edition, Academic Press, Oxford.