This paper summarizes the theory used in a system that identifies foreign body impact on a composite plate using built-in strain sensors. The identification system consists of a model of the composite plate and an identification algorithm. The algorithm compares the measured response of the plate to the model response and estimates the impact location and force time history. The solution, which uses a smoother/filter optimization, includes a new computational algorithm that saves considerable computation time for systems with many degrees of freedom.
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References
1.
1. Wu, E., and Yeh, J. C., "Identification of Impact Forces at Multiple Locations on Laminated Plates,"AIAA Journal, Vol. 32, No. 12, 1994, pp. 2433-2439.
2.
2. Yen, C. S., and Wu, E., "On the Inverse Problem of Rectangular Plates Subjected to Elastic Impact, Part II: Experimental Verification and Further Application,"ASME Journal of Applied Mechanics, Vol. 62, September 1994, pp. 692-698.
3.
3. Yen, C. S., and Wu, E., "On the Inverse Problem of Rectangular Plates Subjected to Elastic Impact, Part II: Experimental Verification and Further Applications,"ASME Journal of Ap.plied Mechanics, Vol. 62, September 1994, pp. 699-705.
4.
4. Shaw, J. K., Sirkis, J. S., Friebele, E. J., Jones, R. T., and Kersey, A. D., "Model of Transverse Plate Impact Dynamics for Design of Impact Detection Methodologies,"AIAA Journal, Vol. 33, No. 7, 1995, pp. 1237-1334.
5.
5. Jones, R. T., and Sirkis, J. S., "Location and Magnitude of Impact Detection in Composite Plates Using Neural Networks,"SPIE Smart Structures and Materials, Vol. 2444, 1995, pp. 469-480.
6.
6. Gunther, M. F., Wang, A., Fogg, R. P., Starr, S. E., Murphy, K. A., and Claus, R. O., "Fiber Optic Impact Detection and Location System Embedded in a Composite Material,"SPIE Smart Structures and Materials, Vol. 1789, 1992, pp. 262-269.
7.
7. Choi, K., and Chang, F. K., "Identification of Impact Force and Location Using Distributed Sensors,"Journal ofAIAA, Vol. 34, No. 1, 1996, pp. 136-142.
8.
8. Bryson, A. E., and Idan, M., Optimal Estimation and Control, lecture notes for E207C. Stanford University. 1992.
9.
9. Tracy, M. J., and Chang, F. K., "Identifying Impacts in Composite Plates with Piezoelectric Strain Sensors. Part II: Experiment,"Journal of Intelligent Material Systems and Structures, to be published.
10.
10. Tsai, S. W., Composite Design, Think Composites, Dayton, OH, 1988.
11.
11. Franklin, G. F., Powell, J. D., and Workman, M. L., Digital Control of Dynamic Systems, Addison-Wesley, 2nd edition, 1990.
12.
12. Bach, R. E., "A Variational Technique for Smoothing Flight-Test and Accident Data,"AIAA Journal of Aircraft, Vol. 19, No. 7, 1982, pp. 546-552.
13.
13. Sage, A. P., and Melsa, J. L., System Identification, Academic Press, New York and London, 1971.
