Time-domain fault identifying method based on coefficient variation of regression model

A regression model, time-domain fault technology, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve problems such as difficult engineering applications, misjudgment of normal signals as faults, and large external influences.
CN102829967AActive Publication Date: 2012-12-19CHINA SHIP DEV & DESIGN CENT
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA SHIP DEV & DESIGN CENT
Publication Date
2012-12-19

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Abstract

The invention relates to a time-domain fault identifying method based on coefficient variations of a regression model. The time-domain fault identifying method includes the following steps of firstly, setting a reference eigenvector, and extracting a set of a reference eigenvector formed by coefficients of the regression model; secondly, setting an eigenvector to be evaluated: extracting another set of a to-be-evaluated eigenvector formed by coefficients of the regression model according to the same way of the first step when in need of fault diagnosis of equipment; thirdly, computing difference degree between the eigenvector to be evaluated and the reference eigenvector, and indicating the difference degree as vector distance; fourthly, evaluating significance level as time limit value; and fifthly, comparing and judging equipment conditions: comparing the vector distance with the limit value, and analyzing and judging whether faults exist or not. The time-domain fault identifying method is low in computing cost and high in reliability and applicability.
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Description

[0001] technical field

[0002] The invention belongs to the field of fault diagnosis of marine mechanical equipment, and in particular relates to a time-domain fault identification method based on regression model coefficient changes. Background technique

[0003] For a large and complex system such as a ship, if a certain key equipment cannot continue to work due to failure, it will affect the normal operation of the entire system at least, and lead to serious consequences of machine crash and death. Therefore, the failure of ship mechanical equipment Identification technology is getting more and more attention. There are many physical information used for fault identification, but the most widely used and the best engineering application effect is the identification technology based on vibration field. Among the many fault identification methods based on the vibration field, the identification method based on the time domain can identify the fault of the system only thr...

Claims

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