Pipeline real-time stress obtaining method

An acquisition method and pipeline technology, applied in force/torque/work measuring instruments, measuring devices, instruments, etc., can solve the problems of easy omission of hidden danger points, large safety hazards, etc., to achieve simple acquisition, ensure accuracy and reliability , high precision effect

Active Publication Date: 2016-03-16
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

This method is a qualitative evaluation method, and at the same time, the determination of dangerous points in this method is based on human experience, so it is easy to miss hidden dangerous points and cause great safety hazards

Method used

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  • Pipeline real-time stress obtaining method
  • Pipeline real-time stress obtaining method

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Embodiment Construction

[0033] Such as figure 1 As shown, the method for obtaining the real-time stress of the pipeline includes the following steps:

[0034] 1) Install a series of measuring sensors along the axial direction of the pipeline under test. The measuring sensors are non-contact acceleration sensors or displacement sensors. The measuring sensors are set at equal distances. Each measuring sensor is used as a measuring point. into the processor;

[0035] 2) Obtain the displacement of each point at the current moment in real time, and the displacements are y 0 ,y 1 ,y 2 ,...,y n , the relationship between pipeline stress σ and displacement y is: in, σ is the stress at the measuring point of the pipeline, E is the elastic modulus of the measured pipeline, M is the bending moment at the measuring point, D is the outer diameter of the pipeline, I is the inertial product of the pipeline, and the axis of the pipeline before deformation is the x-axis, perpendicular to The upward direction...

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Abstract

The invention discloses a pipeline real-time stress obtaining method. The method comprises the following steps: a series of measurement sensors are installed along the axial direction of a detected pipeline, wherein the measurement sensors are non-contact type acceleration transducers or displacement sensors, the measurement sensors are arranged at equal intervals, each measurement sensor is taken as on measurement point, and amplitude obtained by each measurement sensor is input to a processor; displacement of each point at current time is obtained in real time, wherein the relation between the stress sigma of the pipeline and displacement y is indicated in the descriptions; and a vibration-stress model indicated in the descriptions is constructed by taking measurement values of every three adjacent measurement points as a group, wherein if is assumed that there are n+1 measurement points, a stress curve of the whole pipeline is fitted by use of equivalent vibration stress of (2-n)-th measurement points. According to the invention, the pipeline real-time stress obtaining method has the following advantages: adhesion of foil gauges at the surface of the pipeline is unnecessary, an inherent structure of the pipeline does not have to be changed, and pipeline stress parameters can be accurately obtained in real time.

Description

technical field [0001] The invention relates to a method for acquiring real-time stress of a pipeline. technical background [0002] Pipelines are widely used in industrial production, especially in petroleum, chemical, and energy industries. Usually, pipelines will vibrate during operation, especially high-temperature and high-pressure pipelines. Due to long-term high-temperature and high-pressure working conditions, internal pressure and external loads Fatigue damage is prone to occur under the action of the pipeline, which may lead to cracking of the pipeline, leakage of fluid in the pipeline or even rupture of the pipeline, which is prone to major safety accidents. With the improvement of safety requirements for pipelines in service, a safety index is needed to describe the safety of pipelines. At this stage, indicators describing pipeline safety include qualitative safety indicators and quantitative safety indicators. Qualitative indicators include allowable speed, al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
CPCG01L5/00
Inventor 曹衍龙周威杰杨将新吴涛叶雪峰张泽嘉冉盛辉鄢慧文何泽威黄金娜
Owner ZHEJIANG UNIV
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