Finite element analysis based pipeline random-vibration fatigue life analyzing method

Abstract

The invention relates to a finite element analysis based pipeline random vibration fatigue life analyzing method, which mainly includes: by finite element analysis, after acquiring response of structural dynamic stress power spectrum density (PSD) on the condition of random vibration of pipelines, combining a damage model and a material S-N curve (stress-number of cycles curve) to compute fatigue life of a pipeline structure, and accordingly, judging whether the pipeline structure stays at the safety working state or not, if not, optimizing the pipeline structure until the pipeline structure is qualified. The finite element analysis based pipeline random-vibration fatigue life analyzing method solves the problem about vibration fatigue life analysis prediction of existing launcher model pipelines and provides guidance and verification for design and test of pipeline vibration fatigue life, can effectively analyze and predict the fatigue lives of the liquid launcher pipelines under the action of random-vibration load, provides guidance and verification for fatigue design of the pipeline structures, is sufficiently applied in the computing analysis of conveying pipes of manned space launchers and achieves excellent effect.

Description

technical field [0001] The invention relates to a pipeline fatigue life analysis method, in particular to a pipeline random vibration fatigue life analysis method based on finite element analysis. Background technique [0002] At present, in my country's liquid rocket pressurized delivery system, the field of dynamic fatigue life analysis and prediction of pipelines is basically blank. Most of the pipeline products are assessed by random vibration tests, and there is no relatively mature method to analyze the dynamic fatigue life of pipelines. and prediction, thus providing guidance and verification for design and experimentation. With the continuous improvement of model development requirements and the increasingly busy development tasks, the traditional dynamic fatigue life analysis method that relies on test verification has the characteristics of long cycle and high cost. Therefore, an analysis that can effectively analyze and predict the vibration fatigue life of pipelin...

AI Technical Summary

Problems solved by technology

With the continuous improvement of model development requirements and the increasingly busy development tasks, the traditional dynamic fatigue life analysis method that relies on test verification has the characteristics of long cycle and high cost. Therefore, an analysis that can effectively analyze and predict the vibration fatigue life of pipelines is studied method becomes an urgent need

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