A fuzzy set approach for reliability calculation of valve controlling electric actuators

D P Karmachev, A A Yefremov, E E Luneva
2017 IOP Conference Series: Materials Science and Engineering  
The oil and gas equipment and electric actuators in particular frequently perform in various operational modes and under dynamic environmental conditions. These factors affect equipment reliability measures in a vague, uncertain way. To eliminate the ambiguity, reliability model parameters could be defined as fuzzy numbers. We suggest a technique that allows constructing fundamental fuzzy-valued performance reliability measures based on an analysis of electric actuators failure data in
more » ... e with the amount of work, completed before the failure, instead of failure time. Also, this paper provides a computation example of fuzzy-valued reliability and hazard rate functions, assuming Kumaraswamy complementary Weibull geometric distribution as a lifetime (reliability) model for electric actuators. Reliability or survival function is the essential reliability measure defined as the probability that a failure doesn't occur before specified time t:
doi:10.1088/1757-899x/177/1/012027 fatcat:7nkabyztmfajrh7lwoh5aqeyb4