Reliability Evaluation for TWT with Small Samples
Xiaohan Sun · Dianzi xuebao · 2010
Reliability of Traveling Wave Tubes(TWTs) are crucial for operation of many armaments.However,due to the complexity and expensiveness of TWTs,the way to precisely evaluate their reliability under small sample size is still the problem to face.In this way,prior information,such as expert experience and historical data,can be used to enhance the estimation precisions.With a fuzzy prior distribution construction method for TWTs introduced,based on fuzzy membership functions,prior information can be effectively merged with test data using Bayes method.Reliability evaluation for some satellite TWTs shows that,the precision can be enhanced notably for data with small samples or high truncation levels by using Bayes estimation with normal fuzzy prior distributions.And the estimation can be modified by increasing test information.Furthermore,the bandwidth of the normal priors can be used to adjust the proportion of prior information within the post-Bayes distributions.