Affiliation:
1. Mechanical Engineering Department, United States Naval Academy, 590 Holloway Road, Annapolis, MD 21402
Abstract
This paper presents a method for locating structural damage using experimental vibration data. The method uses measured frequency response functions to obtain displacement as a function of frequency. The displacement functions are converted to curvature functions, which are further processed to yield a damage index, displayed on a plot of position versus frequency. The method can be applied when there is no a priori knowledge about the undamaged structure, and it is suitable for automation. This paper details the theory of the broadband method, and the results of an experimental demonstration in which a steel beam was damaged with a narrow slot. It is shown that this proposed damage detection method is highly sensitive, and can locate a very small amount of damage. For example, the narrow slot was correctly located when there was only a 0.8 percent reduction in thickness in the beam. Traditionally, damage causes a change in natural frequencies, but at this small level of damage the frequency changes were within experimental error. Other published methods failed to locate the slot until it was significantly deeper. [S0739-3717(00)01403-3]
Reference26 articles.
1. Kashangaki, T. A. L., 1995, “Mode Selection for Damage Detection Using the Modal Sensitivity Parameter,” AIAA/ASME/ASCE/AHS Structures, Structural Dynamics & Materials Conference Collection of Technical Papers, 3, pp. 1535–1542.
2. Hajela, P., and Soeiro, F. J., 1990, “Structural Damage Detection Based on Static and Modal Analysis,” Am. Inst. Aeronaut. Astron. J., 28, No. 6, pp. 1110–1115.
3. Crema, L. B., Castellani, A., and Coppotelli, G., 1995, “Damage Localization in Composite Material Structures by Using Eigenvalue Measurements,” Materials and Design Technology, Petroleum Division Publication PD v71, American Society of Mechanical Engineers, New York, pp. 210–205.
4. Cawley, P., and Adams, R. D., 1979, “The Location of Defects in Structures from Measurements of Natural Frequencies,” J. Strain Anal., 14, No. 2, pp. 49–57.
5. Manning, R. A.
, 1994, “Structural Damage Detection Using Active Members and Neural Networks,” Am. Inst. Aeronaut. Astron. J., 32, No. 6, Technical Notes, pp. 1331–1333.
Cited by
148 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献