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Abnormal wear diagnosis method for marine diesel engine based on union reliability rule reasoning

A technology for marine diesel engines and diagnostic methods, which is applied in special data processing applications, internal combustion engine testing, electrical digital data processing, etc., and can solve problems such as inexplicability and unknown model input and output relationships

Active Publication Date: 2019-06-25
HANGZHOU DIANZI UNIV
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Problems solved by technology

The currently widely used intelligent fault diagnosis model is mainly based on the black box model, and the relationship between the input and output inside the model is usually unknown and unexplainable

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  • Abnormal wear diagnosis method for marine diesel engine based on union reliability rule reasoning
  • Abnormal wear diagnosis method for marine diesel engine based on union reliability rule reasoning
  • Abnormal wear diagnosis method for marine diesel engine based on union reliability rule reasoning

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Embodiment Construction

[0039] The present invention comprises the following steps:

[0040] Step (1) input is to collect the wear parts of a marine diesel engine and the lubricating oil of the main engine working medium, including the iron element (Fe) content f a (t)≥0, unit mg / L; aluminum element (Al) content f b (t)≥0, unit mg / L; lead element (Pb) content f c (t)≥0, unit mg / L; silicon element (Si) content f d (t)≥0, the unit is mg / L; the data is collected once per hour, for a total of T hours, and 1≤T1 , single failure mode 1 main bearing abnormal wear G 2 , single failure mode 2 Abnormal wear of piston ring G 3 , single failure mode 3 piston abnormal wear G 4 , single failure mode 4 cylinder liner abnormal wear G 5 , and combinations of concurrent failure modes include: Two failure modes concurrent [(G 2 G 3 ),(G 2 G 4 ),(G 2 G 5 ),(G 3 G 4 ),(G 3 G 5 ),(G 4 G 5 ),(G 3 G 2 ),(G 4 G 2 ),(G 5 G 2 ),(G 4 G 3 ),(G 5 G 3 ),(G 5 G 4 )]; and so on, three failure modes concu...

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Abstract

The invention discloses an abnormal wear diagnosis method for a marine diesel engine based on union reliability rule reasoning. Firstly, element contents in a working medium lubricating oil of a wearcomponent and a host of the marine diesel engine are used as input, and marine diesel engine abnormal wear component fault conditions are used as output; then, a reliability rule system is establishedand a corresponding attribute weight group is determined according to the correlation between fault features and fault modes; a evidence reasoning algorithm is used to fuse a reliability structure ina reliability rule consequent activated by the input to obtain the reliability value of a fault mode under a specific attribute weight group; and finally, the reliability value is balanced and analyzed to obtain an abnormal wear component diagnosis result. Various elements for marine diesel engine abnormal wear component diagnosis can be handled, a many-to-many complex relationship between the fault features and the fault modes can be characterized, the correlation between the fault features and the fault modes can be characterized, and a complicated condition of concurrence of multiple faultmodes can be diagnosed.

Description

technical field [0001] The invention relates to a method for diagnosing abnormally worn components of a marine diesel engine based on union reliability rule reasoning, and belongs to the field of fault detection. Background technique [0002] Marine diesel engines are widely used as the main source of ship power because of their large output power, high work efficiency, and long continuous working hours. The failure of marine diesel engine will affect the safe operation of the ship, which is related to the safety of life and property on board. The marine diesel engine integrates a variety of advanced technologies, the system has many layers, and the structure is complex. Many components will fail during operation, and due to the variety and frequent occurrence of failures, the failure mode is more of a concurrent failure mode. A large number of marine diesel engine failures are caused by abnormal friction and wear. The problems are mainly concentrated in typical failures su...

Claims

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Application Information

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IPC IPC(8): G01M15/05G06F17/50
Inventor 常雷雷雷杰徐晓滨徐晓健黄大荣韩德强侯平智
Owner HANGZHOU DIANZI UNIV
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