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Project Number 23
Date of Summary March 31, 1985
Subject Incipient Structural Failure by the Random Decrement Method
Performing Activity University of Maryland
Principal Investigator Dr. Jackson Yang
Contracting Agency Office of Naval Research
Estimated Completion Complete
Description This was a joint Industry Project (JIP); to conduct a laboratory study of vibration response of a scale model of an offshore tower subjected to random excitation. The random decrement technique will be applied to the recorded and filtered vibration response data to establish a set of signatures. From these signatures the sensitivity of the signatures to induced fatigue cracks of various lengths and locations can be studied.
Progress Complete. Experimentation was conducted on a model offshore structure which was tested in air and water and on solid and sand footings. Effects of simulated structural damage were studied on natural frequency and mode shapes. Results demonstrated the ability of the method to detect and measure progressive failure in the model. The Random Decrement technique also was evaluated under the NDE Round Robin Program, Project No. 34 and results are encouraging. It is being applied to several offshore structures made available by the Navy and the Coast Guard to determine possible field related problems.
Reports
AA (13 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Dagalakis, N. G., Hirt, M., Application of the Random Decrement Technique in the Detection of Induced Cracks on an Offshore Platform Model, Computational Methods for Offshore Structures, Special publication AMD-Volume 37 of the American Society of Mechanical Engineers (ASME). Library of Congress #80-69180, 1980.
AB (24 pages) File in Adobe's Portable Document Format (PDF) . Li, C. S., Yang, J. C. S., Dagalakis, N. G., Messick, W., Similitude Analysis and Testing of Prototype and 1:13.8 Scale Model of an Offshore Platform, This paper was accepted for publication in the 51st Shock and Vibration Bulletin.
AC (5 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Dagalakis, N. G., Detection of Incipient Failure in Structure Using Random Decrement Technique, Proceeding of the Fall Meeting of Society of Experimental Stress Analysis (SESA), pp. 43, Ft. Lauderdale, Florida, 1980.
AF (14 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Aggour, M. S., Dagalakis, N., Miller, F., Damping of an Offshore Platform Model by Random Dec Methods, American Society of Civil Engineers (ASCE)/EMD Specialty Conference, Atlanta, Georgia, pp. 819-832, January 15-16, 1981.
AJ (104 pages) File in Adobe's Portable Document Format (PDF) . Lin, Chin-Po, The Measurement of Damping and Natural Frequencies in Linear Systems by Using the Random Decrement Technique, M. S. Thesis, University of Maryland, 1981.
AK (15 pages) File in Adobe's Portable Document Format (PDF) . Miller, F. H., Dynamic Properties of Offshore Structures with Different Foundation Types by the Random Decrement Technique, M. S. Thesis, University of Maryland, 1981.
AL (11 pages) File in Adobe's Portable Document Format (PDF) . Larach, E. R., Dynamic Response and Safety of Offshore Platforms Using the Random Decrement Technique, M. S. Thesis, University of Maryland, 1982.
AM (20 pages) File in Adobe's Portable Document Format (PDF) . Felser, G. J., The Detection of Fatigue Cracks in Offshore Structures Utilizing the Random Decrement Technique, M. S. Thesis, University of Maryland, 1982.
AO (9 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Aggour, M. S., Al-Sanad, H., Dynamic Shear Modulus and Damping from Random Loading Tests, ASTM Geotechnical Testing Journal, Volume 6, No. 3, Philadelphia, Pennsylvania, September 1983.
AP (12 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Dagalakis, N. G., Measurement of Structural Damping Using the Random Decrement Technique, The Shock and Vibration Bulletin, Bulletin 53, Part 4, Naval Research Laboratory, Washington, D.C., May 1983.
AQ (9 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Aggour, M. S., Al-Sanad, H., Application of the Random Decrement Technique in the Determination of Damping of Soils, Proceedings of the Seventh European Conference on Earthquake Engineering, Athens, Greece, September 1982.
AR (10 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Tsai, T., Paulin, V., Chen J., Tsai, W. H., Structural Damage Detection by the System Identification Technique, 56th Shock and Vibration Bulletin, Dayton, Ohio, 1984.
AS (5 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Marks, C. H., Jiang, J., Chen, D., Elahi, A., Tsai, W. H., Determination of Fluid Damping Using Random Excitation, Third International Offshore Mechanics and Arctic Symposium, New Orleans, Louisiana, February 12-17, 1983.
AT (10 pages) File in Adobe's Portable Document Format (PDF) . Tsai, T., Yang, J. C. S. Chen, R. F. Detection of Damages in Structures by the Cruss Random Decrement Method, Proceedings of the 3rd International Model Analysis Conference, Orlando, Florida, pp. 691-700, January 28-31, 1985.
AU (9 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Tsai, T., Tsai, W. H., Chen, R. F., Detection and Identification of Structural Damage from Dynamic Response Measurements, Fourth International Offshore Mechanics and Arctic Engineering Symposium, OMAE, Dallas, Texas, February 17-21, 1985.
AV (83 pages) File in Adobe's Portable Document Format (PDF) . Yang, J. C. S., Identification and Location of Damages in Structures by the System Identification Technique, Progress Report, University of Maryland, May 18, 1984.
 

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