Degradation modeling and life prediction method of digital multimeter for water surface ship equipment

Abstract

The invention relates to a degradation modeling and life prediction method of a digital multimeter for water surface ship equipment. The multimeter has five measurement indexes with relatively strongcorrelation, including a direct-current voltage, a direct current, an alternating-current voltage, an alternating current and resistance; based on test data of the five measurement indexes when the multimeter works in a marine environment with continuously and dynamically changed temperature, relative humidity and salt mist, a degradation model of each performance index is built; a degradation failure rate marginal distribution function of each performance index is obtained; the degradation failure rate marginal distribution functions of all the performance indexes are fused by utilizing a Copula function to obtain a degradation joint distribution function of the multimeter; and the overall residual life and reliability of a product are predicted. According to the method, the influences ofthe time-based change of an environmental stress and the relatively strong correlation between the measurement indexes on the overall degradation of the multimeter are considered. The life predictionmethod of the digital multimeter for the water surface ship equipment is more in accordance with the actual situation; and the prediction precision is improved.

Description

Technical field [0001] The invention relates to a degradation modeling and life prediction method of a digital multimeter for surface ship equipment, in particular to a digital multimeter for surface ship equipment under continuous dynamic changes of temperature, relative humidity and salt fog in a marine environment Degradation modeling and life prediction methods belong to the technical field of degradation modeling and life prediction. Background technique [0002] With the development of science and technology, the reliability requirements of products are getting higher and higher. Especially in military fields such as aerospace, electronic ships, etc., the life and reliability of key components of weapon equipment are very important. In view of the characteristics of long life and high reliability of military products, the method of performance degradation modeling is usually used to predict the life of the products. Traditional degradation modeling methods are mainly aimed...

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Problems solved by technology

[0017] In order to solve the problem that the traditional degradation modeling method can not solve the practical engineering problems well, the purpose of the present invention is to provide a degradation modeling and life prediction method of the digital multimeter used in surface warship equipment, by describing the change of marine environmental stress on the The relationship between the degradation of the five measurement indicators of the digital multimeter establishes a degradation model based on Wiener motion, and at the same time considers the degradation process of the interrelated DC voltage, AC voltage, DC current, AC current and resistance multi-performance indicators of the digital multimeter. Copula function fuses the degradation of multiple performance indicators to obtain the overall reliability and remaining life prediction of digital multimeters for surface ship equipment

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