Research on Remaining Life Prediction of Two times N for K System under Weibull Distribution
In the safety instrument system of petro-chemical plants,instruments are often redundantly arranged to improve safety and reliability.However,there is currently limited research on the commonly used two times N-to-K redundant structure of instru-ment systems.A residual life prediction method for redundant systems with instruments following Weibull distribution was proposed to address this situation.The instrument life was described using a three pa-rameter Weibull distribution,and the relevant param-eters were solved using maximum likelihood method and genetic algorithm.Then,based on the failure characteristics of the two times N for K system,the remaining life distribution and expectation of the re-dundant system were derived.Finally,simulation ex-periments were conducted on the life of the two times 4 for 2 redundant instrument.The experimental re-sults showed that the proposed method had a MAPE of 18%for predicting the remaining life,which can provide support for the development of instrument ma-intenance plans.
safety instrumented systemtwo times N for K systemremaining life prediction,Weibull dis-tributionmathematic expectation
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