1.School of Naval Architecture&Ocean Engineering, Huazhong University of Science and Technology,Wuhan 430074,China;
2.Hubei Key Lab of Naval Architecture, Ocean Engineering Hydrodynamics,Wuhan 430074,China;
3.Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration, Shanghai 200240,China
Abstract:Damage often appears in fluid-filled pipelines during their service period with a certain change of their structural dynamic parameters and energy transmission form.Here, energy balance equation and energy finite element equation of a fluid-filled pipeline’s vibration were established according to its dynamic equation.The energy finite element method and the finite element method were used, respectively to compute and compare the fluid-filled pipeline’s energy density.The correctness of the energy finite element method used to solve vibration response of the fluid-filled pipeline was verified.Then, two damage indexes based on energy density variation and energy flow variation were established, respectively.The effects of damaged element’s stiffness and damping variations on the energy flow index were discussed.Examples showed that the index based on energy flow variation can be used to effectively identify the damage position of a fluid-filled pipeline structure; the study results provide a theoretical foundation for predicting a fluid-filled pipeline’s vibration and identifying its damage based on the energy finite element method.
尚保佑 1,2,3,朱翔1,2, 3,李天匀 1,2, 3,梁孝天1,2, 3. 基于能量有限元法的损伤充液管道振动分析[J]. 振动与冲击, 2019, 38(21): 31-36.
SHANG Baoyou1,2,3,ZHU Xiang1,2,3,LI Tianyun1,2,3,LIANG Xiaotian1,2,3,. Vibration analysis of a damaged fluid-filled pipeline based on energy finite element method. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(21): 31-36.
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