Damage determination of pipelines based on variation of vibrating frequencies
Dynamic equations reveal that variations of structures stiffness and mass may cause changing of its natural frequencies. When damages occurred on a structure, stiffness and mass would change, and different damages would cause different changes of stiffness and mass, and thus the vibrating modes of the structure changed. Comparing a given vibrating mode to the pre-set database would determine the damage and its location. Based on this theory, a method was proposed to detect damage of a pipeline and determine its location by measuring the natural frequencies. A model of a pipeline with several preset damages was established using FEM, assuming mass uniformly distributed and section been symmetrical. Vibrating modes on two main orthogonal paths were computed and analyzed. By pattern recognizing, a damage could be determined.
pipeline damage numerical simulation natural frequencies vibrating mode pattern recognition
NIU Hui ZHANG Yiping YU Yanan
Institute of Municipal Engineering, Zhejiang University, Hangzhou 310058, China
国际会议
三峡
英文
80-83
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）