Method, system and device for predicting nonlinear response of flexible pipeline under internal flow action

Abstract

The invention discloses a method, a system and a device for predicting the nonlinear response of a flexible pipeline under the internal flow action, and belongs to the technical field of pipeline design and prediction. The invention aims to solve the problem that many key information of structural vibration response cannot be obtained due to the fact that the stability analysis of a pipeline is based on a linear theory at present. According to the method, numerical research is carried out for the flexible pipeline nonlinear response problem of internal fluid movement, and a complete numerical prediction model of flexible pipeline movement under the internal flow action is established and used for analyzing the internal flow speed and the flexible pipeline nonlinear response under different system parameters; The numerical forecasting model can well simulate the influence of different internal flow velocities, different axial forces, different fluid pressures, different gravity coefficients and different axial flexibility on the vibration response of the flexible structure; The dynamic characteristics of the structural instability can be well disclosed, and the problems existing in actual engineering can be well described. The method is mainly applied to flexible pipeline nonlinear response prediction.

Description

technical field [0001] The invention relates to a nonlinear response prediction method, system and device of a flexible pipeline, and belongs to the technical field of pipeline design and prediction. Background technique [0002] In modern industry, pipeline is the most common current-carrying device. With the rapid development of modern science and technology, the application of pipeline in aerospace, petroleum, chemical industry, marine, biological and nuclear engineering and other fields is becoming more and more widely. When the flow pipe transports the internal fluid, the pipe will have a coupling effect with the internal fluid. When the fluid flows along the axial direction in the pipe, the pipe will be affected by the fluid and vibrate. When the internal flow velocity is small, the effect is weak, and the influence on the pipeline structure can be ignored. As the flow velocity of the fluid in the pipe increases, the impact of the pipe by the internal fluid becomes m...

AI Technical Summary

Problems solved by technology

At present, most of the studies on the vibration response of flexible cylinders are based on linear theory, and more key information such as the specific vibration response amplitude of the structure cannot be obtained.

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