A Comprehensive Detection and Prediction Method of Pipeline Vibration Based on Limited Measuring Points

Abstract

A comprehensive detection and prediction method for pipeline vibration based on limited measuring points. In this method, the inversion method of pipeline system load and constraint conditions is transformed into an optimization problem: the simulation signal and the experimental results of the acceleration response of the measuring point under certain load and constraint conditions The residual function of the signal is used as the objective function of the optimization problem, and the optimal solution is found in the parameter feasible region to make the objective function extremely small; the load and constraint conditions of the pipeline system are reconstructed step by step: first, a known load is applied to the pipeline , reconstruct the constraint parameters, and then reconstruct the load parameters based on the reconstructed constraint parameters; finally, based on the reconstructed load, constraint parameters, pipeline structure design parameters and materials, the pipeline is obtained through finite element modeling Comprehensive vibration information for the system. The invention can comprehensively consider complex and diverse pipeline structures, connections and restraint forms, realize comprehensive detection of the vibration and damage state of the pipeline system, and has the advantages of high detection precision and strong engineering applicability.

Description

technical field [0001] The invention relates to the technical field of dynamic strength analysis and reliability non-destructive evaluation of a pipeline system, in particular to a comprehensive detection and prediction method for pipeline vibration based on limited measuring points for the pipeline system. Background technique [0002] The pipeline system is an important part of the liquid rocket engine. It is used to connect the main structure of the liquid rocket engine propellant tank, turbo pump, thrust chamber, combustion chamber, etc. The pipeline system can be called the "cardiovascular" of the liquid rocket engine. The pipelines of liquid rocket engines are mostly irregular thin-walled structures, and most of them work under complex load conditions such as low / high temperature, high pressure and multi-source vibration. There are different degrees of stress concentration or residual stress in the connection and welding of the main structure. The superposition of thes...

AI Technical Summary

Problems solved by technology

At present, in the research of liquid rocket engine pipelines in China, especially in the treatment of pipeline failures, most of the "comprehensive treatment" measures such as adding clamps, changing direction and increasing wall thickness have been adopted, resulting in insufficient dynamic strength design of pipelines. unknown degree, conservative, low overall performance, serious negative impact, etc.

In addition, no in-depth research has been conducted on the dynamic strength analysis and reliability evaluation of the rocket engine pipeline under non-stationary random strong vibration, and there is a lack of effective dynamic optimization design and reliability growth technology, etc.

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