AN EXPERIMENTAL STUDY OF STRUCTURE MODAL PROPERTIES IN DIFFERENT OPERATIONAL ENVIRONMENTS
Vibration-based damage detection and health monitoring has become very popular in recent years. Significant work has been done in the formulation of vibration-based damage detection algorithms, but unfortunately, investigations studying the variability of dynamic properties caused by changing environmental and operational conditions have been lacking. A thorough understanding of this variability is necessary so that changes in vibration response resulting from damage can be discriminated from changes resulting from such variability. In this study, a scaled pipeline model is designed with some removable springs that connect the pipeline model and the steel base to simulate the changing boundary conditions such as that caused by scouring of the sea bed. Three laboratory tests are carried out in different operational environments, i.e., impact hammer test, wind tunnel and towing tank tests. The natural frequencies, mode shapes and damping ratios are identified from the measured responses using stochastic subspace identification technique. The variability in modal properties of the pipeline system in different operational environments will be discussed and compared with the variation due to damage.
X.Q. Zhu H. Hao X.L. Peng
CRC for Integrated Engineering Asset Management School of Civil and Resource Engineering, the University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia
国际会议
长沙
英文
1055-1061
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）