DIC-based hydraulic pipeline joint lateral force test method

Abstract

The invention relates to a DIC-based hydraulic pipeline joint lateral force test method. The method comprises the following steps of 1, measuring hydraulic pipeline joint displacement by adopting a DIC binocular identification vibration measurement system; and 2, according to the displacement data obtained through testing, adopting Abaqus finite element simulation software to calculate the lateral force of the hydraulic pipeline joint. The DIC binocular recognition vibration measurement system is adopted, the displacement of the designated position of the pipeline is directly detected, the detectable range is wide, and the vibration condition of the pipeline in a long time period can be obtained. Then vibration displacement and relative displacement of the hydraulic pipeline are obtained through data analysis, and in combination with finite element simulation, the lateral force of the designated pipeline position is calculated.

Description

technical field [0001] The invention belongs to the field of hydraulic pipelines, and in particular relates to a DIC-based testing method for lateral force of hydraulic pipeline joints. Background technique [0002] In recent years, with the development of hydraulic systems towards high pressure and high power, the vibration problem of hydraulic pipelines has gradually become prominent, and the lateral force of pipeline joints caused by vibration is often an important reason for the failure of pipeline joints. At present, the calculation of the lateral force of the pipeline joint is mainly through theoretical analysis and finite element simulation, and the models need to be simplified, and the calculation results often cannot be well matched with the actual engineering problems. [0003] Due to the high power and high pressure of modern hydraulic pipelines, during the working process, the pipelines often vibrate violently and generate large lateral forces, causing damage to ...

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Problems solved by technology

[0004] When using theoretical analysis or finite element simulation for hydraulic pipeline vibration analysis, the model often needs to put forward some basic assumptions and make certain simplifications, sometimes it cannot represent the actual engineering situation

At present, the stress test method for hydraulic pipelines is mainly to use strain gauges for testing. The disadvantage of this method is that there are some errors in the strain gauges themselves, and it is necessary to predict the danger points first. Using strain gauges can only get the pipeline part. Point strain, the error is relatively large in use, and the measurable range is small

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