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Study on the Methods of Tolerance Analysis and Design

Author: WeiWenBo
Tutor: LiuQiZhong
School: Xi'an University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Tolerance Feasible region approximation Estimated Yield Center design
CLC: TN622
Type: Master's thesis
Year: 2005
Downloads: 191
Quote: 1
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Abstract


Affected by many factors , between the actual value and the design value of the product components inevitably there is a certain degree of deviation , resulting in product performance and yield decline , even so the product is extremely sensitive to the use of the environment . Tolerance refers to the scope of this bias , it directly affects the product quality and production costs . Smaller tolerances can often get a better product performance, but increase the cost of production . In contrast, large tolerance can reduce costs , but will cause a decline in the quality of products . Therefore , it is necessary to study the tolerance , the product quality and cost can cater to a certain extent . This paper studies the existing tolerance analysis and design methods , as well as a more detailed study center design parameters . Tolerance analysis , design and parameters center design , generally need to approximate the parameters feasible region , or know the pass rate Tolerance known case . Therefore, several of the more common feasible domain approximation and yield estimation methods were introduced . The authors propose a tolerance analysis methods based on niche genetic algorithm . This method is used not only applicable to many parameters tolerance analysis of the problem , and be able to handle more than one characteristic function tolerance analysis problems . This paper the method is used for the analysis and design of 3mm rectangular waveguide broadband directional coupler , and verify the feasibility and effectiveness of the method . In addition, the authors of the particle swarm algorithm combined with the feasible domain approximation method , a center designed to obey any of the statistical distribution of the design parameters , design and literature comparison shows that the method has certain advantages .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Electronic components, assemblies > Microwave transmission control components > Couplers, directional couplers
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