Pipeline inner inspection technology based on Pipeline Inspection Gauge(PIG),is the primary means for ensuring the safety of submarine pipelines.The dynamic characteristics of a PIG can change abruptly with the excita...Pipeline inner inspection technology based on Pipeline Inspection Gauge(PIG),is the primary means for ensuring the safety of submarine pipelines.The dynamic characteristics of a PIG can change abruptly with the excitation of obstacles such as girth welds inside the pipeline,which would result in failure or inaccuracy of the inspection results.This study establishes a dynamic model of the PIG sealing disc based on Kelvin spring damping in the circumferentially confined space.The axial vibration differential equations of the PIG is examined in detail.MSC/ADAMS is used to conduct the dynamic simulation of the PIG at different motion velocities and center of mass positions while passing through the girth weld process.Results indicate that the axial vibration caused by the girth weld intensifies substantially as the speed of the PIG increases,while the pitch and vertical vibrations exhibit a significant decline with an increase in the motion velocity.The change in the PIG’s center of mass positions has little effect on its axial vibration,while the pitch and vertical vibration conditions are significantly different in the same circumstances.展开更多
This paper introduces the design and development of intelligent ultrasonic ＂pig＂ used for seabed pipeline inspection. The data acquisition system （DAS） and the signal processing method are presented. The DAS was d...This paper introduces the design and development of intelligent ultrasonic ＂pig＂ used for seabed pipeline inspection. The data acquisition system （DAS） and the signal processing method are presented. The DAS was designed using a muhi-DSP based structure. The signal processing method adopted a well-enhanced split-spectrum processing （SSP） based on weighting algorithm according to statistical times, which was the statistical distribution of the discrete signals selected by the minimization algorithm. Furthermore, the data compressing method was discussed. It assures the mass data to be processed and compressed in real-time. The effectiveness of the method was proved by laboratory experiments. The research provides an excellent base for further development of the ultrasonic pig.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51805542)the Strategic Cooperation Technology Projects of CNPC and CUPB(ZLZX2020-05)the Science Foundation of China University of Petroleum,Beijing(No.2462020YXZZ046 and 2462020XKJS01)
文摘Pipeline inner inspection technology based on Pipeline Inspection Gauge(PIG),is the primary means for ensuring the safety of submarine pipelines.The dynamic characteristics of a PIG can change abruptly with the excitation of obstacles such as girth welds inside the pipeline,which would result in failure or inaccuracy of the inspection results.This study establishes a dynamic model of the PIG sealing disc based on Kelvin spring damping in the circumferentially confined space.The axial vibration differential equations of the PIG is examined in detail.MSC/ADAMS is used to conduct the dynamic simulation of the PIG at different motion velocities and center of mass positions while passing through the girth weld process.Results indicate that the axial vibration caused by the girth weld intensifies substantially as the speed of the PIG increases,while the pitch and vertical vibrations exhibit a significant decline with an increase in the motion velocity.The change in the PIG’s center of mass positions has little effect on its axial vibration,while the pitch and vertical vibration conditions are significantly different in the same circumstances.
基金Supported by the High Technology Research and Development Program of China (Grant No2001AA602021)
文摘This paper introduces the design and development of intelligent ultrasonic ＂pig＂ used for seabed pipeline inspection. The data acquisition system （DAS） and the signal processing method are presented. The DAS was designed using a muhi-DSP based structure. The signal processing method adopted a well-enhanced split-spectrum processing （SSP） based on weighting algorithm according to statistical times, which was the statistical distribution of the discrete signals selected by the minimization algorithm. Furthermore, the data compressing method was discussed. It assures the mass data to be processed and compressed in real-time. The effectiveness of the method was proved by laboratory experiments. The research provides an excellent base for further development of the ultrasonic pig.
文摘在导出柱坐标下多层媒质中波传播传输矩阵的基础上,选取合适的材料、参数,研制出超声轮式换能器,得到了与传输矩阵理论预期相一致的回波信号.自行设计研制了由超声轮式换能器、驱动系统以及微型计算机控制的信号采集与处理系统组成的管道爬行器.对PVC(polyvinyl chloride)管道上人造缺陷的实验测定结果表明,超声轮式换能器的测厚精度优于±0.2 mm.
