Dynamic Modeling and Analysis of Pipeline Inspection Gauge Passing Girth Welds Considering Fluid-solid Coupling

doi:10.3901/JME.2020.23.129

Abstract

Abstract: Pipeline inner inspection technology based on pipeline inspection gauge (PIG), is the primary means to ensure the safety and reasonable maintenance of oil and gas pipelines. Aiming at the problem of sudden changes in dynamic behavior of the PIG when impacting the girth weld in the pipe under the action of high-pressure fluid. A dynamic model of the sealing disc based on Kelvin spring damping in the circumferentially confined space is established. The PIG system dynamics model is established based on the sealing disc model. The axial vibration differential equations of the overall model and the flow equation are deduced in detail. The fluid-solid coupling simulation of Matlab/Simulink and Adams is carried out. The dynamic response of the PIG to impact the girth weld is studied when the velocity of motion is changed. The results show that the established dynamic model of the sealing disc and pipeline PIG system can well characterize the mechanical properties of the sealing disc and the PIG in the axial, radial and circumferential directions of the pipeline. The faster the PIG moves, the more intense the axial vibration caused by the girth weld, and the more obvious the collision vibration, while the vertical and the pitch vibrations are significantly weakened with the increase of the moving velocity.

Key words: pipeline inspection gauge, fluid-solid coupling, shock vibration, dynamic response, multi-system model

CLC Number:

TE973

ZHANG Hang, CUI Can, LIAO Ningsheng, ZHANG Shimin. Dynamic Modeling and Analysis of Pipeline Inspection Gauge Passing Girth Welds Considering Fluid-solid Coupling[J]. Journal of Mechanical Engineering, 2020, 56(23): 129-140.

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