Fault analysis method in ship equipment maintenance process

Abstract

The invention discloses a fault analysis method in a ship maintenance process, and the method comprises the following steps: 1) carrying out the decomposition description of a maintenance task of ship equipment, and obtaining a decomposed maintenance process; 2) aiming at each decomposed maintenance process, carrying out fault mode and fault reason analysis in the maintenance process; 3) carrying out fault influence analysis in the maintenance process for each decomposed maintenance process; 4) calculating a risk priority number; and 5) suggesting improvement measures in the maintenance process. According to the method, the maintenance process is analyzed, and potential faults in the maintenance process and the consequences of the faults can be evaluated for analysis in the maintenance operation process so as to determine the occurrence opportunities of eliminating or reducing the potential faults.

Description

Technical Field

[0001] The present invention relates to the field of ship maintenance and support, and in particular to a fault analysis method in a ship equipment maintenance process. Background Art

[0002] As a unit that performs missions independently at sea, ships often have longer mission durations than land and air equipment. When a ship breaks down, it can only rely on its own maintenance and support resources for repair. If the fault cannot be repaired in time, it will directly affect the completion of the mission.

[0003] As the complexity of the ship's structure increases, it is more likely to encounter equipment damage caused by human error during maintenance. Good maintenance procedures play an important role in reducing the occurrence of accidents during maintenance. However, when compiling maintenance procedures, due to the complexity of the work (it requires various types of information such as product structure, function, maintenance support resources, and maintenance personnel characteristics), it is easy to lead to incomplete compilation of relevant technical data, which may cause failures during maintenance operations and cause unexpected losses. Therefore, it is necessary to study a method to analyze and expose potential problems in the maintenance process. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for fault analysis in the process of ship equipment maintenance in view of the defects in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for fault analysis during ship maintenance, comprising the following steps:

[0006] 1) Decompose and describe the maintenance tasks of ship equipment to obtain the decomposed maintenance process;

[0007] 2) For each maintenance process decomposed, analyze the failure mode and cause of failure during the maintenance process;

[0008] The analysis of the failure mode is the maintenance operation errors during the maintenance process and the consequences that are quite likely to occur due to improper operation;

[0009] Failure modes include:

[0010] (1) Failure modes that often occurred during equipment maintenance;

[0011] (2) Failure modes that have not yet occurred but are likely to occur;

[0012] (3) Failure modes with low probability of occurrence but high harmfulness;

[0013] (4) The failure modes are fundamentally different from those generated during product use;

[0014] (5) The main failure modes to be addressed in daily preventive maintenance work;

[0015] The analysis of the cause of failure is the reason why the failure mode occurs during the maintenance process;

[0016] The causes of the failure include: reasons related to the design or configuration of the ship equipment components, external environment or facilities, maintenance personnel, and organizational and management reasons;

[0017] 3) Carry out failure impact analysis during the maintenance process for each decomposed maintenance process;

[0018] Failure impact analysis refers to the impact of the failure mode of the maintenance process on the next operation or subsequent operation, as well as the impact of the failure mode on the maintenance personnel, maintenance resources and component or system performance of the product;

[0019] According to the analysis results, the impact of the failure is classified into five categories, including: impact on maintenance personnel, impact on maintenance support resources, impact on components / systems, impact on the next operation, and impact on subsequent operations;

[0020] 4) Calculation of risk priority number;

[0021] Calculate the risk priority number (RPN) value for each failure mode and prioritize them;

[0022] 5) Suggestions for improvement of the maintenance process;

[0023] For the improvement measures that can be taken, calculate the risk priority number RPN value and obtain the set of improvement measures that can make the RPN value reach the minimum acceptable level; the improvement measures include design improvement measures and operation improvement measures;

[0024] With the goal of reducing the level of harmfulness or the probability of occurrence of failures in the maintenance process and reducing the losses after failures occur, improvement measures are recommended from the set of improvement measures.

[0025] According to the above scheme, in the calculation of the risk priority number, the conditional probability result corresponding to the conditional probability of the failure occurrence is used to define the failure detection degree.

[0026] The beneficial effects produced by the present invention are:

[0027] The method of the present invention can analyze the maintenance process, and the analysis during the maintenance operation can evaluate the potential failures in the maintenance process and the consequences of the failures to determine whether the chance of potential failures can be eliminated or reduced.

[0028] The method of the present invention calculates the risk priority number RPN value for each failure mode, and uses the conditional probability result to define the detection degree and limit its range from the perspective of mathematical theory, so that the calculation is more accurate and scientific. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 is a method flow chart of an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of RPN calculation in the maintenance process of an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] like Figure 1 As shown, a method for fault analysis in a ship maintenance process comprises the following steps:

[0034] 1) Decompose and describe the maintenance tasks of ship equipment to obtain the decomposed maintenance process;

[0035] As shown in Table 1, a maintenance task of ship equipment is decomposed and described as the object of analysis.

[0036] Table 1 defines the maintenance process

[0037]

[0038]

[0039] 2) For each maintenance process decomposed, analyze the failure mode and cause of failure during the maintenance process;

[0040] The analysis of the failure mode is the maintenance operation errors during the maintenance process and the consequences that are quite likely to occur due to improper operation;

[0041] Failure modes include:

[0042] (1) Failure modes that often occurred during equipment maintenance;

[0043] (2) Failure modes that have not yet occurred but are likely to occur;

[0044] (3) Failure modes with low probability of occurrence but high harmfulness;

[0045] (4) The failure modes are fundamentally different from those generated during product use;

[0046] (5) The main failure modes to be addressed in daily preventive maintenance work;

[0047] The analysis of the cause of failure is the reason why the failure mode occurs during the maintenance process;

[0048] The causes of the failure include: reasons related to the design or configuration of the ship equipment components, external environment or facilities, maintenance personnel, and organizational and management reasons;

[0049] 3) Carry out failure impact analysis during the maintenance process for each decomposed maintenance process;

[0050] Failure impact analysis refers to the impact of the failure mode of the maintenance process on the next operation or subsequent operation, as well as the impact of the failure mode on the maintenance personnel, maintenance resources and component or system performance of the product;

[0051] According to the analysis results, the impact of the failure is classified into five categories, including: impact on maintenance personnel, impact on maintenance support resources, impact on components / systems, impact on the next operation, and impact on subsequent operations;

[0052] 4) Calculation of risk priority number;

[0053] Calculate the risk priority number (RPN) value for each failure mode and prioritize them;

[0054] The RPN analysis of the maintenance process is different from the conventional RPN analysis. In the calculation, the influence range of the fault mode is refined, and the influence degree is defined for the system (S), operation process (S), operator (P) (see Table 3), and maintenance resource (M). In terms of the fault mode detection degree, the conditional probability result calculation is used, such as Figure 2 As shown. In conventional RPN analysis, the severity level, maintenance failure mode severity level and detection level need to be defined separately, especially for detection level, the direct definition of the detection possibility of the failure mode is not strict, and it is difficult to describe the real harm of the failure mode;

[0055] The detection degree is defined using conditional probability results, such as Figure 2 In the figure, mode 1 indicates that when maintenance operation x is performed, two fault effects z and y may occur, where the probability of z fault mode occurring is p(x)p(z|x), and the corresponding conditional probability result is CPO (z|x), the probability of the occurrence of fault mode y is p(x)p(y|x); its corresponding conditional probability result is p(x)p(y|x); Mode 2 in the figure indicates that fault z will be caused by two maintenance operations x and y, and its probability of occurrence is p(z|x,y)p(x)p(y), and the corresponding conditional probability result is CPO (y|x) ; Mode 3 indicates that the occurrence of fault z is due to the chain operation of x and y, and its occurrence probability is p(z|x,y)p(x)p(y), and its corresponding conditional probability result is CPO (z|y|x) This method requires defining the corresponding CPO number for the conditional probability level (see Table 2), and the corresponding relationship is positively correlated. The calculation formula of the improved maintenance process risk priority number is as follows: RPN = S × O × CPO.

[0056] Among them, S represents the severity level of the fault mode, O represents the frequency of occurrence of the fault mode, and CPO is the conditional probability result corresponding to the conditional probability of the fault occurrence.

[0057] Table 2 Conditional probability results

[0058]

[0059]

[0060] 5) Suggestions for improvement of the maintenance process;

[0061] For the improvement measures that can be taken, calculate the risk priority number RPN value and obtain the set of improvement measures that can make the RPN value reach the minimum acceptable level; the improvement measures include design improvement measures and operation improvement measures;

[0062] With the goal of reducing the level of harmfulness or the probability of occurrence of failures in the maintenance process and reducing the losses after failures occur, improvement measures are recommended from the set of improvement measures.

[0063] The improvement measures that can be taken are to analyze the possible improvement measures for each failure mode, reduce the level of hazard or probability of failure during the maintenance process, and reduce the loss after the failure occurs. Improvement measures are divided into design improvement measures and operation improvement measures. Design improvement measures are to change the maintenance process, process, or equipment, facilities, and instruments used; operation improvement measures are to determine the matters that need attention or preventive measures when maintenance personnel implement maintenance, and record them in the maintenance procedures. The effectiveness of improvement measures is to determine whether they can control the probability of failure or the consequences of failure to an acceptable level.

[0064] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A method for fault analysis during ship maintenance, characterized in that: The following steps are involved: 1) Decompose and describe the maintenance tasks of ship equipment to obtain the decomposed maintenance process; 2) For each maintenance process decomposed, analyze the failure mode and cause of failure during the maintenance process; The analysis of the failure mode is the maintenance operation errors during the maintenance process and the consequences that are quite likely to occur due to improper operation; The analysis of the cause of failure is the reason why the failure mode occurs during the maintenance process; The causes of the failure include: reasons related to the design or configuration of the ship equipment components, external environment or facilities, maintenance personnel, and organizational and management reasons; 3) Carry out failure impact analysis during the maintenance process for each decomposed maintenance process; Failure impact analysis refers to the impact of the failure mode of the maintenance process on the next operation or subsequent operation, as well as the impact of the failure mode on the maintenance personnel, maintenance resources and component or system performance of the product; According to the analysis results, the impact of the failure is classified into five categories, including: impact on maintenance personnel, impact on maintenance support resources, impact on components / systems, impact on the next operation, and impact on subsequent operations; 4) Calculation of risk priority number; Calculate the risk priority number (RPN) value for each failure mode and prioritize them; 5) Suggestions for improvement of the maintenance process; For the improvement measures that can be taken, calculate the risk priority number RPN value and obtain the set of improvement measures that can make the RPN value reach the minimum acceptable level; the improvement measures include design improvement measures and operation improvement measures; With the goal of reducing the level of harmfulness or the probability of occurrence of failures in the maintenance process and reducing the losses after failures occur, improvement measures are recommended from the set of improvement measures.

2. The method for analyzing faults during ship maintenance according to claim 1, characterized in that: In step 2), the failure modes include: (1) Failure modes that often occurred during equipment maintenance; (2) Failure modes that have not yet occurred but are likely to occur; (3) Failure modes with low probability of occurrence but high harmfulness; (4) The failure modes are fundamentally different from those generated during product use; (5) The main failure modes to be addressed in daily preventive maintenance work.

3. The method for fault analysis in a ship maintenance process according to claim 1, characterized in that: In the calculation of the risk priority number, the conditional probability result corresponding to the conditional probability of the failure occurrence is used to define the failure detection degree.

4. The method for fault analysis during ship maintenance according to claim 1, characterized in that: In the calculation of the risk priority number, RPN = S × O × CPO; Among them, S represents the severity level of the fault mode, O represents the frequency of occurrence of the fault mode, and is the conditional probability result corresponding to the conditional probability of the fault occurrence.

5. An electronic device, characterized in that: include: one or more processors; as well as a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors are caused to execute the method according to any one of claims 1 to 4.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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