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Method for analyzing uncertainty of thermal coupling system based on rough set theory

A technology of rough set theory and thermal-mechanical coupling, applied in the field of uncertainty analysis of thermal-mechanical coupling systems based on rough set theory, can solve problems such as low efficiency and dependence on prior knowledge, so as to improve calculation efficiency, reduce calculation times, and ensure calculation The effect of global precision

Pending Publication Date: 2022-03-11
BEIHANG UNIV
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Problems solved by technology

[0006] In view of this, the present invention provides a thermal-mechanical coupling system uncertainty analysis method based on rough set theory, which is used to solve the problem that the thermal-mechanical coupling system uncertainty analysis method relies on any prior knowledge and has low efficiency

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  • Method for analyzing uncertainty of thermal coupling system based on rough set theory
  • Method for analyzing uncertainty of thermal coupling system based on rough set theory
  • Method for analyzing uncertainty of thermal coupling system based on rough set theory

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Embodiment Construction

[0021] In order to make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] Rough set theory, as a mathematical tool to deal with uncertain problems, does not need to provide any prior knowledge other than the data set required by the uncertain problem, and only uses the information of the data set to reveal potential laws. The method has a good combination. Using rough set theory to analyze the u...

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Abstract

The invention discloses a rough set theory-based uncertainty analysis method for a thermal coupling system, relates to the field of mechanical engineering, and is used for solving the problems that the uncertainty analysis of the thermal coupling system depends on priori knowledge and is low in efficiency. The method comprises the following steps: determining a discourse domain of uncertain parameters of the coupling system, and constructing a knowledge base of the discourse domain according to experimental measuring points; for any uncertain region in the discourse domain, constructing an upper and lower approximation set and calculating approximation precision; an initial Kriging model is established through Latin hypercube sampling and system finite element calculation, and Kriging model parameter correction is realized by using a maximum likelihood estimation and pattern search method; and based on a maximum mean square error point adding criterion, establishing an adaptive Kriging model, and further calculating response upper and lower bounds of the upper and lower approximation sets to obtain response approximation precision. By applying the rough set theory, when uncertainty analysis is carried out on the thermal coupling system, dependence on priori knowledge is not needed, and efficiency is high.

Description

technical field [0001] The invention belongs to the field of mechanical engineering, and in particular relates to an uncertainty analysis method of a thermomechanical coupling system based on rough set theory. Background technique [0002] Uncertainty analysis is the premise of reliability analysis and robust optimization. It refers to the process of quantitatively describing the uncertainty in the system and calculating the system output response analysis including uncertain parameters. With the development of numerical simulation technology, the existence of factors such as model simplification errors, changes in load and material properties, processing and measurement errors make uncertainties widely exist in engineering practice. For a simple structure, the influence of uncertain factors is small, but for complex systems, the accumulation and coupling of uncertain factors will seriously affect the stability and reliability of the system. How to effectively realize the qu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F119/02G06F119/08
CPCG06F30/23G06F2119/08G06F2119/02
Inventor 王冲范浩然强鑫
Owner BEIHANG UNIV
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