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In this paper, the yarn lab equipment for fully automatic evenness tester reliability analysis and reliability-based optimization design. First has carried on the function analysis of automatic evenness tester, and established the system task reliability model; Reliability data and in reference to other evenness tester, on the basis of the reliability of the system has carried on the forecast and distribution. Second, without considering the reliability of software and the control system, by using the method of fault tree analysis (FTA), the mechanical system (detection extension) automatic evenness tester, this paper analyzes the reliability, through the analysis of its structure, function, a single unit of fault tree is established and the system fault tree; According to the principle of system reliability and the probability of events has carried on the qualitative analysis and quantitative calculation, find out the weak link of the system, puts forward the ways to enhance the reliability of mechanical system. In addition, the mechanical parts and mechanical system reliability optimization design model are classified discussion. Finally, on the basis of reliability analysis, the key components of the system for the reliability optimization design based on probability. Engineering practice proves that this optimization method is reasonable and effective, to improve the system reliability, maintainability, and cost reduction is beneficial.
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