Abstract
Due to its advantages of small size and light weight, multi-pulse rectifier has a broad application prospect in the field of aviation. The 18-pulse rectifier is more popular in practical engineering application because of its better rectifier characteristics than 12-pulse, its simpler structure process and easier to realize than 24-pulse. The theoretical research and engineering application of the 18-pulse rectifier have achieved some success. However, whether the reliability of the system can be satisfied has always been one of the key problems to be solved in practical engineering. The aim of this work is to study the reliability modeling and prediction of the 18-pulse rectifier power supply. Its reliability block diagram and mathematical model are established. According to US Military handbook MIL-HDBK-217F, the most authoritative and widely used in the world, the two most commonly used methods for reliability prediction are parts count method and part stress analysis method. The reliability data are estimated by these two methods. It is concluded that the value of mean time between failures in airborne environment is 23326 h, which meets the requirement of 1.5 times of 15000 h. According to the reliability data, the failure mode and effect analysis of its weak links are carried out, and the improvement measures are proposed. This will promote and guide the reliability growth and engineering popularization of the 18-pulse rectifier power supply. At the same time, the reliability of the actual project can be extended to other related engineering applications to ensure the reliable operation of the system.
Highlights
Reliability prediction is a method used to evaluate whether the designed products meet the specified reliability requirements
According to the circuit diagram of the 18-pulse rectifier power supply, the reliability block diagram (RBD) is adopted for reliability modeling of the system
Due to the complexity of component types and operating environment, the current reliability prediction still has many shortcomings, such as not fully considering all factors affecting product reliability, not fully reflecting the impact of new devices and new processes on reliability. These shortcomings do not obliterate the importance of reliability prediction in evaluating the reliability level of products and in preventing, detecting and correcting defects in the design, manufacture and use of products
Summary
Reliability prediction is a method used to evaluate whether the designed products meet the specified reliability requirements. The theoretical simulation and the engineering application of the 18-pulse rectifier power supply have achieved some success, but whether its reliability parameters meet the optimal requirements of the system? The general process and operation flow of two reliability prediction methods commonly used in electronic equipment, that is parts count method and part stress analysis method, are summarized This product is a repairable system, failure rate, λ(t), and mean time between failures (MTBF) are selected to measure its reliability. The failure mode and effect analysis (FMEA) of weak links are carried out and the improvement measures are proposed This will promote and guide the reliability and engineering popularization of the 18-pulse rectifier power supply. According to the circuit diagram of the 18-pulse rectifier power supply, the RBD is adopted for reliability modeling of the system. There are generally two methods to predict the reliability of electronic equipment, parts count method and part stress analysis method
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