Space traveling wave tube reliability evaluation method based on multi-source data fusion

Abstract

The invention discloses a space traveling wave tube reliability evaluation method based on multi-source data fusion. The method comprises the following steps: S1, processing acquired data and extracting features; S2, calculating an edge probability of a bottom layer input node of an established Bayesian network model according to a result obtained in the step S1; S3, calculating edge probabilitiesof input nodes of other layers of the Bayesian network model according to the edge probabilities of the bottom layer input nodes obtained in the step S2; and S4, calculating a reliability point estimation result of the traveling wave tube according to the calculation result obtained in the step S3 and the Bayesian network model of the traveling wave tube. According to the invention, while staticreliability evaluation is carried out on the product, real-time on-orbit telemetry data can also be utilized to realize operation reliability evaluation on the traveling wave tube, and the result canbe used as an important basis for the working state and on-orbit health management of a satellite key single machine.

Description

technical field [0001] The invention relates to the field of evaluating the reliability of spacecraft stand-alone products by using multi-source data, in particular to a method for evaluating the reliability of a space traveling wave tube based on multi-source data fusion. Background technique [0002] The space traveling wave tube is a key component of the space-borne transponder and the space-borne synthetic aperture radar transmitter. Its function is mainly to realize the amplification of microwave power. Its reliability is very important for the stable operation of the whole star system. Due to the complex structure of the traveling wave tube, many processes and parts are involved, and the price is expensive, it is a small sample product. [0003] The reliability evaluation results obtained by traditional statistical methods mostly take the failure time as the statistical object, use a large number of life tests or accelerated life tests to obtain product failure data, a...

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Problems solved by technology

Due to the complex structure of the traveling wave tube, many processes and parts are involved, and the price is expensive, it is a small sample product

[0003] The reliability evaluation results obtained by traditional statistical methods mostly take the failure time as the statistical object, use a large number of life tests or accelerated life tests to obtain product failure data, and then assume that the life distribution obeys the exponential distribution or Weibull distribution. Evaluate the reliability of the product at the end of its life. Due to the short test time and the limited number of failures, the evaluation results are relatively conservative

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