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A method of simulating and obtaining fault data of marine diesel engine

A marine diesel engine and fault data technology, which is applied in the direction of engine testing, machine/structural component testing, internal combustion engine testing, etc., can solve problems such as difficulties in data collection for specific fault states, and achieve the effect of ensuring random uncertainty

Active Publication Date: 2019-07-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is dedicated to solving the problem of difficult data collection of the existing real marine diesel engine fault occurrence process and specific fault state, and proposes a method for simulating and obtaining the fault data of the marine diesel engine, which can simultaneously obtain the data of the slowly changing fault occurrence process and the specific fault state data, reducing the cost of fault data collection

Method used

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  • A method of simulating and obtaining fault data of marine diesel engine
  • A method of simulating and obtaining fault data of marine diesel engine
  • A method of simulating and obtaining fault data of marine diesel engine

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Experimental program
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Embodiment 1

[0031] In this embodiment, the exhaust pipe blockage fault data is generated by simulation, and a marine diesel engine model is constructed by taking the 6S35ME-B9 diesel engine of MAN Company as an example.

[0032] Step S1, setting the structural parameters in the mathematical model of the diesel engine according to the parameters of the actual marine diesel engine, and establishing a practical and feasible model of the diesel engine.

[0033] Step S2, analyze the clogging fault of the exhaust pipe of the diesel engine, and determine to use the method of gradually reducing the diameter of the initial position of an exhaust manifold B9 to simulate the fault. When there is no fault factor, the diameter of the initial position of the exhaust manifold B9 is 170mm , set the initial position threshold diameter when a fault occurs to be 130mm. In order to accelerate the generation of failure data, the expected time for such failures is set to 50 days.

[0034] Step S3 is to select a...

Embodiment 2

[0038] This implementation case is used to simulate the insufficient cooling fault data of the air cooler 2, using the same marine diesel engine model as the experimental case 1.

[0039] Step S1, establishing the required diesel engine model according to the actual structural parameters of the diesel engine.

[0040] Step S2, analyze the insufficient cooling fault of the air cooler 2 of the diesel engine, determine the fault caused by the attachment of impurities to the simulated air cooler pipeline in this implementation case, and use the method of gradually reducing the cooling efficiency of the air cooler 2 for simulation. The cooling efficiency of the air cooler 2 is 89.5% when there is no fault, and the cooling efficiency threshold is 65%. Accelerate the generation of failure data, setting the expected time for such failures to be 51 days.

[0041] In step S3, the value of the increment constant λ in the growth Wiener process of the selected fault factor is -0.05%, the ...

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Abstract

The invention discloses a method for obtaining fault data of marine diesel engine by simulation, belongs to the field of marine diesel engine fault monitoring and prediction and is based on marine diesel engine model. The method comprises the following steps: establishing a practical diesel engine model, and adjusting structural parameters of the model to make output parameters consist with an actual diesel engine; analyzing and determining a diesel engine fault factors adding method, a fault threshold and time required for occurrence of a fault; gradually adding fault factors into the model according to a Wiener process until the determined fault threshold is reached, and respectively collecting monitoring parameters under each stable state condition during a fault occurrence process to obtain fault occurrence process data. According to the method for obtaining fault data of marine diesel engine by simulation, a large number of marine diesel engine fault data can be efficiently generated by using a simulation model; according to the growth of simulated fault factors in the Wiener process, the random uncertainty of the fault occurrence process is guaranteed, the fault data collection cost is reduced, and a large amount of data is provided for qualitative analysis of a marine diesel engine fault and a data-driven fault analysis method.

Description

technical field [0001] The invention belongs to the field of marine diesel engine failure monitoring and prediction, and relates to a method for simulating and obtaining marine diesel engine failure data. Background technique [0002] The acceleration of the process of global economic integration has also promoted the development of the maritime industry. As the most widely used ship power device at present, the failure of marine diesel engines accounts for 60% to 80% of the failures of the entire ship. It is of great significance to ensure the long-term stable operation of ships. The traditional marine diesel engine fault monitoring technology mainly relies on experienced technicians to regularly check manually, which is inefficient and can no longer meet people's growing requirements for ship stability. Data-driven fault monitoring technology has high diagnostic accuracy. Judging its health status by analyzing system history and current monitoring parameters has attracted...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/05G01M15/10
CPCG01M15/05G01M15/102G01M15/106
Inventor 韩敏李锦冰韩冰钟凯
Owner DALIAN UNIV OF TECH
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