Reliability analysis method for heat transfer system containing fuzzy parameters

Abstract

The invention discloses a reliability analysis method for a heat transfer system containing fuzzy parameters. The method comprises the following steps that: carrying out the finite element modeling of a heat transfer system; utilizing a fuzzy variable to represent uncertain input parameters, and establishing the fuzzy finite element equation of the heat transfer system; selecting a cut set level, and converting the fuzzy variable into an interval variable so as to obtain one group of interval finite element equations; utilizing a perturbation theory to solve the interval finite element equations to obtain the upper and lower bounds of interval temperature response; according to the temperature response, establishing an ultimate state function which represents system reliability, and calculating the upper and lower bounds of the ultimate state function; utilizing an interval sorting method to process the ultimate state function to obtain an interval reliability index under each cut set level; and carrying out integral computation on the interval reliability index under the cut set level, and finally, obtaining the fuzzy reliability index of the heat transfer system. On a premise that calculation efficiency is guaranteed, by use of the method, the fuzzy reliability calculation accuracy of the heat transfer system can be effectively improved, which can not be realized by general commercial software.

Description

technical field [0001] The invention belongs to the field of mechanical engineering, and in particular relates to a method for analyzing the reliability of a heat transfer system containing fuzzy parameters. Background technique [0002] Reliability is an important aspect that needs to be considered in structural analysis and optimization. It refers to the ability of the system to complete specified functions under specified conditions during the specified service life. In nature and various fields of production technology, heat energy transfer caused by temperature differences is an extremely common physical phenomenon. Especially in the manufacturing process of industrial equipment such as aerospace, engine, energy and chemical industry, and precision products such as electronic devices, how to effectively realize heat transfer to improve the reliability of the heat transfer system has become an important aspect of product design. [0003] Many existing studies on thermal...

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Problems solved by technology

Obtaining enough sample data in the initial stage often costs too much or is too expensive, which limits the further promotion of stochastic reliability models and analysis methods

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