Abstract
The jet pipe servo valve is widely used in the military fields of aviation and ship, whose reliability has obvious randomness and dynamic. However, existing methods are either having complicated theory or analyzing static reliability. Based on the generalized stochastic petri nets (GSPN) theory and the collected basic failure modes and failure rate data of jet pipe servo valve, this paper proposes a novel modeling and simulating method for system’s dynamic behavior analysis. In this method, the dynamic reliability model considering failure’s random and repair is established and is simulated using GSPN software. Then, the steady state probability of servo valve is calculated, which is compared with the value calculated by Markov method. Finally, the dynamic reliability parameters of jet pipe servo valve are calculated using collected failure rate data and different repair rate data. Results show the probability that the maximum error between methods of GSPN and Markov is 2.07%, the optimal repair rate set is less than 1.71µi, and also the dynamic reliability parameters become better with increasing simulation time because of failure’s recovery. Therefore, research methods and results based on GSPN are concise and realistic, which can be used for failure’s qualitative forecast and dynamic reliability’s quantitative calculation of similar complicated system.
Highlights
The operational requirements such as all-weather, rapid response, and precision strike demand higher performance and function of military equipment
The repair rate depends on the repair strategy, which consists of timely repair, regular overhaul, and reliability centered maintenance (RCM); among them, the RCM is the core of modern maintenance theory
The simulation time is set as 50000 hours; the failure rate data and repair rate data of all subsystems are set according to Table 2; the steady state probability of servo valve system’s working state (M0, M1, . . . , M11) is calculated, which is compared with the value calculated by Markov methods; the errors between them are shown as Table 3
Summary
The operational requirements such as all-weather, rapid response, and precision strike demand higher performance and function of military equipment. All the above propose new challenge for traditional methods of equipment design and reliability analysis In these dynamic and competitive environments, military manufacturing enterprises are facing increasingly fierce market pressure. Based on the actual working conditions and failure rate data of jet pipe servo valve, many scholars have done active researches about its reliability. The growing fields of aviation and ship require the ability to quantitatively calculate the actual impact of failure’s randomness and repair on servo valve system’s reliability, that is, to quantitatively calculate the dynamic reliability of jet pipe servo valve. Considering characters and working conditions of jet pipe servo valve, this paper presents a new method for assessing large and complex system’s dynamic reliability.
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