TY - GEN
T1 - Nondestructive inspection of a lead rubber bearing using ultrasonic wave
AU - Yoneda, Yutaka
AU - Mita, Akira
PY - 2006/7/20
Y1 - 2006/7/20
N2 - At first, two kinds of miniature LRB models are prepared, one model has normal lead damper, the other has abnormal one. And they are scanned by ultrasonic wave using ultrasonic transducers and AE sensors. The output signals obtained through the inside are different from each other. Infinite route is assumed as ultrasonic wave propagation line. But, in this examination, we found that the main route is some layers of steel. Then, the tomography construction is adopted to detect the condition of lead plug in one layer of steel plate. The full acoustic wave solution in an arbitrary two-dimensional object is computed, which is subjected to specified acoustic sources and material parameters. This algorithm is basically a finite difference method. As a result, it is successful to know about ultrasonic wave propagation in one layer of steel and consistent correlation with the output signal. The feature vectors are created by calculation of second power average of the amplitude, and these vectors are used as the data for pattern recognition on the basis of these information. The accuracy of pattern recognition is significantly enhanced in consistent correlation with the condition of lead plug. In this study, active damage detection method to evaluate the status of LRB was proposed. It is possible to evaluate internal states of LRB by using ultrasonic wave.
AB - At first, two kinds of miniature LRB models are prepared, one model has normal lead damper, the other has abnormal one. And they are scanned by ultrasonic wave using ultrasonic transducers and AE sensors. The output signals obtained through the inside are different from each other. Infinite route is assumed as ultrasonic wave propagation line. But, in this examination, we found that the main route is some layers of steel. Then, the tomography construction is adopted to detect the condition of lead plug in one layer of steel plate. The full acoustic wave solution in an arbitrary two-dimensional object is computed, which is subjected to specified acoustic sources and material parameters. This algorithm is basically a finite difference method. As a result, it is successful to know about ultrasonic wave propagation in one layer of steel and consistent correlation with the output signal. The feature vectors are created by calculation of second power average of the amplitude, and these vectors are used as the data for pattern recognition on the basis of these information. The accuracy of pattern recognition is significantly enhanced in consistent correlation with the condition of lead plug. In this study, active damage detection method to evaluate the status of LRB was proposed. It is possible to evaluate internal states of LRB by using ultrasonic wave.
KW - Lead Rubber Bearing (LRB)
KW - Nondestructive inspection
KW - Ultrasonic wave propagation
UR - http://www.scopus.com/inward/record.url?scp=33745957424&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33745957424&partnerID=8YFLogxK
U2 - 10.1117/12.658943
DO - 10.1117/12.658943
M3 - Conference contribution
AN - SCOPUS:33745957424
SN - 0819462276
SN - 9780819462275
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Smart Structures and Materials 2006 - Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
T2 - Smart Structures and Materials 2006 - Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
Y2 - 27 February 2006 through 2 March 2006
ER -