Function-based product FMEA analysis system and method
Through the functional-based product FMEA analysis system, the problem that traditional FMEA cannot be applied to unclear product structure is solved, and risk assessment and optimization of product structure is achieved in the case of unclear product structure, and product quality is improved.
Patent Information
- Application Number
- CN202510399994.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-07-18
AI Technical Summary
The existing product design failure mode and consequence analysis (FMEA) is mainly based on product structure and cannot be applied to situations where the specific product structure is unclear.
Provide a function-based product FMEA analysis system and method, determine the product structure through a function list and functional block diagram, generate the first product analysis tree, and perform failure analysis and control measures to optimize high-risk functions.
The FMEA analysis of the unclear product structure has been achieved, and the product quality and risk management capabilities have been improved.
Smart Images
Figure CN120337538A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of FMEA analysis, and particularly to a product FMEA analysis system and method based on functions. Background Art
[0002] The current Failure Mode and Effects Analysis (FMEA) of product design is based on the FMEA analysis of product structure. For products with unclear specific product structures, traditional FMEA analysis is not applicable. Summary of the Invention
[0003] The purpose of this application is to provide a product FMEA analysis system and method based on functions, which realizes the FMEA analysis of product designs with unclear product structures, is more in line with the development of product research and development work, and improves product quality at the same time.
[0004] To achieve the above purpose, this application provides the following solutions:
[0005] In a first aspect, this application provides a product FMEA analysis system based on functions, including:
[0006] A product function determination module, configured to determine the function list and function block diagram of the target product based on the requirement list of the target product;
[0007] A product structure determination module, configured to determine the structure corresponding to each function in the function list, and if the structure corresponding to the function includes sub-structures, determine the sub-structures of the structure. Each structure and each sub-structure constitute a first product analysis tree;
[0008] A function expansion module, configured to match the sub-structures in the first product analysis tree with corresponding sub-functions to obtain a second product analysis tree;
[0009] A failure analysis module, configured to perform failure analysis on each function and each sub-function in the second product analysis tree, and output the failure causes, failure modes, and failure consequences of each function and each sub-function;
[0010] A control analysis module, configured to add control measures to the failure causes, failure modes, and failure consequences. The control measures include preventive measures, detection measures, and response measures;
[0011] A risk assessment module, configured to determine the AP level corresponding to the failure of each function according to the usage frequency, controllability, and severity of the failure consequences of each function;
[0012] An optimization and improvement module, configured to add optimization measures to the function when the AP level of the function is greater than the set level. The optimization measures include preventive measures, detection measures, and response measures;
[0013] A result documentation module for outputting an FMEA report of the target product.
[0014] Optionally, the function-based product FMEA analysis system further includes:
[0015] A requirements list determination module for determining a requirements list of the target product according to the connection relationship between the target product and each preset external object.
[0016] Optionally, the product function determination module includes a function conversion unit and a function decomposition unit;
[0017] The function conversion unit is used to convert the connection relationship between the target product and each preset external object into an internal function or an internal interface function of the product;
[0018] The function decomposition unit is used to decompose each of the internal functions or the internal interface functions of the product, and the decomposed functions constitute the function list.
[0019] Optionally, the product function determination module is further used to perform P-diagram analysis on each function in the function list to determine the function characteristics of each function.
[0020] Optionally, the product structure determination module is further used to draw external interfaces and internal interfaces and output an interface list; the external interface is a connection interface between a preset external object and a sub-structure, and the internal interface is a connection interface between sub-structures.
[0021] Optionally, the failure analysis module is further used to define failure modes according to each function in the second product analysis tree to generate a failure mode library, and the failure mode library is used to select failure modes when performing failure analysis on each function and each sub-function in the second product analysis tree.
[0022] Optionally, the failure analysis module is further used to input a severity score of the failure consequence.
[0023] Optionally, the product function determination module is further used to input the frequency of use of each function in the function list.
[0024] Optionally, the control analysis module is further used to input the controllability of each function and visually display the AP level of each function.
[0025] In a second aspect, the present application provides a function-based product FMEA analysis method. The function-based product FMEA analysis method applies the function-based product FMEA analysis system, and the function-based product FMEA analysis method includes:
[0026] Determine the function list and function block diagram of the target product based on the requirement list of the target product;
[0027] Determine the structure corresponding to each function in the function list. If the structure corresponding to the function includes sub-structures, determine the sub-structures of the structure. Each structure and each sub-structure form the first product analysis tree;
[0028] Match the sub-structures in the first product analysis tree with the corresponding sub-functions to obtain the second product analysis tree;
[0029] Conduct failure analysis on each function and each sub-function in the second product analysis tree, and output the failure causes, failure modes, and failure consequences of each function and each sub-function;
[0030] Add control measures to the failure causes, failure modes, and failure consequences. The control measures include preventive measures, detection measures, and response measures;
[0031] Determine the AP level corresponding to the failure of each function according to the usage frequency, controllability, and severity of the failure consequences of each function;
[0032] When the AP level of a function is greater than the set level, add optimization measures to the function; the optimization measures include preventive measures, detection measures, and response measures;
[0033] Output the FMEA report of the target product.
[0034] According to the specific embodiments provided by the present application, the present application discloses the following technical effects:
[0035] The present application provides a product FMEA analysis system and method based on functions. Determine the function list and function block diagram based on the requirement list of the target product, generate the first product analysis tree according to the sub-structures corresponding to each function and the hierarchical relationship between each function, conduct function matching on the first product analysis tree to obtain the second product analysis tree, and realize the FMEA analysis of the target product according to the second product analysis tree, overcoming the problem that product FMEA analysis cannot be carried out when the product structure is not clear. In addition, response measures are added to the failure consequences, and when the AP level of a function is greater than the set level, optimization measures are added to the function, improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0037] Figure 1 Schematic diagram of the structure of a function-based product FMEA analysis system provided by an embodiment of the present application;
[0038] Figure 2 Schematic diagram of the workflow of function-based product FMEA analysis provided by an embodiment of the present application;
[0039] Figure 3 Schematic diagram of the requirements block diagram provided by an embodiment of the present application;
[0040] Figure 4 Schematic diagram of the connection relationship between the target product and each preset external object provided by an embodiment of the present application;
[0041] Figure 5 Schematic diagram of the function block diagram provided by an embodiment of the present application;
[0042] Figure 6 Schematic diagram of the product function provided by an embodiment of the present application;
[0043] Figure 7 Schematic diagram of the product function and the internal interface function provided by an embodiment of the present application;
[0044] Figure 8 Function relationship diagram provided by an embodiment of the present application;
[0045] Figure 9 Schematic diagram of the function branch in the first product analysis tree provided by an embodiment of the present application;
[0046] Figure 10 Schematic diagram of the second product analysis tree provided by an embodiment of the present application;
[0047] Figure 11 Schematic diagram of the structure block diagram analysis interface provided by an embodiment of the present application;
[0048] Figure 12 Schematic diagram of the process of a function-based product FMEA analysis method provided by another embodiment of the present application. Detailed implementation manners
[0049] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.
[0050] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0051] The present application provides a product FMEA analysis system based on functions, as Figure 1 shown. The product FMEA analysis system based on functions includes the following modules.
[0052] The product function determination module is used to determine the function list and function block diagram of the target product based on the requirement list of the target product.
[0053] The product structure determination module is used to determine the structure corresponding to each function in the function list. If the structure corresponding to the function includes sub-structures, the sub-structures of the structure are determined. Each structure and each sub-structure form the first product analysis tree.
[0054] The structure corresponding to each function refers to the structure that realizes the function.
[0055] The function expansion module is used to match the sub-structures in the first product analysis tree with the corresponding sub-functions to obtain the second product analysis tree.
[0056] The failure analysis module is used to perform failure analysis on each function and each sub-function in the second product analysis tree, and output the failure causes, failure modes, and failure consequences of each function and each sub-function.
[0057] The failure causes include: lower-level failure (sub-function), input variable failure, input timing failure, control factor failure, and noise factor.
[0058] The failure consequences include: higher-level failure, post-function failure, indirect user or end-user impact.
[0059] Establish the failure chain of each failure mode, and output the "Failure Network" and "Fault Tree". Score the severity S value based on the description of the failure consequences.
[0060] The control analysis module is used to add control measures to the failure causes, failure modes, and failure consequences. The control measures include preventive measures, detection measures, and response measures.
[0061] The risk assessment module is used to determine the measure priority (AP) level of each function according to the usage frequency, controllability, and severity of the failure consequences of each function.
[0062] The optimization and improvement module is used to add optimization measures to the function when the AP level of the function is greater than the set level. The optimization measures include preventive measures, detection measures, and response measures.
[0063] The result documentation module is used to output the FMEA report of the target product.
[0064] In an exemplary embodiment, as Figure 2 shown, the function-based product FMEA analysis process sequentially includes planning and preparation, requirement analysis, function analysis, structure analysis, failure analysis, control analysis, risk evaluation, optimization, and result documentation.
[0065] The function-based product FMEA analysis system further includes a planning and preparation module and a requirement analysis module.
[0066] The planning and preparation module is used to create a project, define the project scope and time plan; create a team and assign task roles; collect customer requirements and lessons learned.
[0067] The requirement analysis module takes the focused product as the analysis object and identifies external objects related to the object. Define the relevant requirements of the external object for the black box, draw a requirement block diagram (R diagram), as Figure 3 shown. Output the "Customer Requirement List" based on the R diagram.
[0068] External objects include users, relevant parties providing inputs, relevant parties receiving outputs, working environments, internal customers, legal and regulatory requirements, etc. Users include direct users, indirect users, and end users; internal customers include relevant parties such as manufacturing, transportation, and maintenance.
[0069] The product function determination module includes a product function analysis unit. The product function analysis unit is used to identify the typical operating scenarios (or task profiles) of the analysis object based on the requirement list of the target product; add first-level functions under each operating scenario (the same function may run through multiple operating scenarios); decompose a certain first-level function into multiple second-level product functions if necessary; decompose a certain second-level function into multiple third-level product functions if necessary (in principle, it can continue to be decomposed downward, but it is not recommended to exceed the third level); define the input / output relationships between internal functions and between internal functions and external objects, and draw a function block diagram (F diagram), as Figure 5 shown. Score the frequency of use F of each function; perform a P diagram analysis on important functions if necessary, and output the "Characteristic List" and "Control Measure List" of the function. Characteristics are derived from outputs and control factors; perform a dynamic analysis on the function using a timing diagram (T diagram) if necessary, and automatically generate the trigger conditions and time requirements of relevant inputs and outputs based on the timing definition; output the "Function Block Diagram" and "Function List" based on the F diagram, P diagram, and T diagram, and obtain the first product analysis tree. The first product analysis tree reflects information such as function hierarchy, series / parallel form, input / output, characteristics, trigger conditions, and operating time. This application can focus on a certain function for detailed analysis and finally output the FMEA report of the function.
[0070] The product structure determination module includes a product structure determination unit. The product structure determination unit is used to focus on a certain function for structure and sub-structure definition. The structure is reusable. One function corresponds to at least one structure, and one structure can correspond to multiple functions. The structure can be split or merged. After all functions have defined the structure and sub-structure, the first product analysis tree is automatically output. Based on the external objects in the F block diagram and the defined sub-structures, the external and internal interfaces are defined, and the structure block diagram (B diagram) is drawn. Based on the B diagram, the "Interface List" and the "Interface Function List" are output. Based on the F diagram and the B diagram, the "Product Function Matrix" is output. The structure tree has two views, namely the function structure tree and the product analysis tree, and relevant information can be viewed by focusing on a certain function or product. It supports the mutual conversion between functions and structures, that is, the function structure tree and the product analysis tree support mutual conversion.
[0071] This application determines the function list and function block diagram based on the requirement list of the target product, then determines the product sub-structures and the connection relationships between the sub-structures according to the function list and function block diagram, generates the first product analysis tree, performs function matching on the first product analysis tree to obtain the second product analysis tree, and realizes the FMEA analysis of the target product according to the second product analysis tree, overcoming the problem that the product FMEA analysis cannot be carried out when the product structure is not clear. In addition, this application adds response measures to the failure consequences, and when the AP level of the function is greater than the set level, optimization measures are added to the function, improving the product quality.
[0072] In an exemplary embodiment, the function-based product FMEA analysis system further includes: a requirement list determination module, which is used to determine the requirement list of the target product according to the connection relationship between the target product and each preset external object.
[0073] This application as a whole adopts the concept of product hierarchical design, uses the structure FMEA tool for design risk assessment, and increases the output of the product function requirements, software and hardware structure list, and internal and external interface list.
[0074] The business process of a function-based product FMEA analysis system in this application includes: identifying the functions of the product or system device (black box block diagram) according to the external interface or interface, dividing the function modules and the input-output relationships between the functions (multi-layer gray box block diagram), that is, determining the hierarchical relationships between the functions; identifying the lower-level software and hardware modules (white box block diagram) based on the function modules and function block diagrams, and finally performing FMEA analysis.
[0075] This application regards the target product as a black box, identifies external objects related to the black box, and presets that the external objects include users, relevant parties of input, relevant parties of output, working environment, internal customers, and legal and regulatory requirements, etc. Among them, users include direct users, indirect users, and end users, and internal customers include relevant parties such as manufacturing, transportation, and maintenance. The requirements list determination module is used to define the relevant requirements of external objects for the black box and draw a black box block diagram.
[0076] The product function determination module is used for product function definition, specifically including: adding first-level product functions to the inside of the black box, and when necessary, decomposing a certain first-level product function into multiple second-level product functions, defining the input-output relationships between internal functions and between internal functions and external objects, drawing a gray box block diagram, and outputting a function block diagram and a function list based on the gray box block diagram.
[0077] As Figure 4 shown, the target product is a ground wire status detection device, and the preset external objects include users, 4G network, GNSS satellites, ground wire head charging device, parameter configuration APP, and cable lines. Figure 4 The connection relationships between each preset external object and the target product are given, the functions corresponding to each connection relationship are determined, and the functional relationships between each preset external object and the target product are obtained. As Figure 6 shown. Figure 6 In it, M is an external object.
[0078] A product FMEA analysis system based on functions in this application, according to the idea of black box - gray box - white box analysis, converts functions into product structures, and can realize customer requirement analysis, product function definition, product architecture design, function expansion, failure analysis, control analysis, risk analysis, optimization, and result documentation, and complete the FMEA analysis of the target product.
[0079] Generate a black box block diagram according to the external interface definition, and output an external interface list based on the black box block diagram, as shown in Table 1.
[0080] Table 1 External Interface List
[0081]
[0082] The product function determination module includes a function conversion unit and a function decomposition unit. This application adds internal functions (internal function boxes) through the operation interface based on the black box block diagram, and converts external interface requirements (function requirements) into product internal functions or internal interface functions. As Figure 7 shown. This application defines external and internal interfaces based on the external objects of the black box block diagram and the defined sub-structures, and draws a white box block diagram. Based on the white box block diagram, an interface list and an interface function list are output, and a product function matrix is output based on the gray box block diagram and the white box block diagram.
[0083] The function conversion unit is used to convert the connection relationship between the target product and each preset external object into an internal function of the product or an internal interface function.
[0084] The function decomposition unit is used to decompose each of the internal functions of the product or the internal interface function. The decomposed functions constitute the function list. The function list includes a product function list and an internal interface function list. The product function list is shown in Table 2, and the internal interface function list is shown in Table 3.
[0085] Table 2 Product Function List
[0086] Serial Number Product Function Remarks 1 Motor Insulation Detection Function 2 Motor Operating Status Monitoring 3 Human-Machine Interaction Management Function 4 Insulation Monitoring Alarm Management 5 Leakage Monitoring Function 6 Remote Communication …
[0087] Table 3 Internal Interface Function List
[0088] Serial Number Internal Function / Characteristic Remarks 1 Live Detection of Motor 2 Live Monitoring Function of Circuit 3 Insulation Monitoring Alarm 4 Residual Voltage Release Function 5 Detection of Normally Closed Output 6 Detection of Normally Open Output 7 Remote Insulation Resistance Detection …
[0089] The product function determination module is further used to perform a Parameter Diagram (P-diagram) P-diagram analysis on each function in the function list, determine the functional characteristics of each function, and output a characteristic list. The characteristics are derived from the input, output, and control factors of the function.
[0090] The product structure determination module is further used to draw external interfaces and internal interfaces and output an interface list; the external interface is a connection interface between a preset external object and a sub-structure, and the internal interface is a connection interface between sub-structures.
[0091] The function expansion module defines the functions of the sub-structures, performs a gray-box block diagram analysis of the sub-structures, and uses a product function matrix to define the functional relationships between the upper and lower levels, and outputs a function network and an event tree.
[0092] The function network integrates the technical dependency relationships between functions, presents the process of the functional structure becoming gradually detailed from top to bottom, and the lower-level functions describe how the higher-level functions are satisfied.
[0093] The event tree is a directed "tree" that describes causal relationships. Its tree diagram starts from the initial event of a hazard source, branches according to whether subsequent events or safety measures are successful, and finally ends at the occurrence of a disaster event, which can provide a systematic method for recording the consequences of an accident.
[0094] Application in this system: When establishing function information, the reliability of the function is also entered into the system. Based on the previously established function network, an event tree can be generated, and then the system automatically calculates the success probability or failure probability of a certain function.
[0095] In an exemplary embodiment, Figure 7Function A is disassembled into line live detection function and motor live detection. The motor insulation detection function is disassembled into detection locking function, residual voltage release function, insulation detection function, and insulation monitoring alarm. The specific function disassembly includes: 1) By right-clicking the mouse, edit the function description to a more detailed one; 2) Right-click on the function block where a sub-function needs to be added and add a sub-function, which is a function in the function list; 3) Connect the transfer relationships between sub-functions by wiring; output the function list and function relationship diagram, and automatically obtain functions in the first structure tree. The function relationship diagram is as shown in Figure 8 shown, and the first structure tree is as shown in Figure 9 shown.
[0096] In the first structure tree, focus on any one function, add the software and hardware structures related to this function, and adjust the functions under the root node product to the corresponding software or hardware structures to generate the second product analysis tree, structure block diagram analysis interface, and software and hardware list. The second product analysis tree is as shown in Figure 10 shown, and the structure block diagram analysis interface is as shown in Figure 11 shown.
[0097] The software and hardware list is shown in Table 4, and the software and hardware function list is shown in Table 5.
[0098] Table 4 Software and Hardware List
[0099] Serial Number Hardware / Hardware Name Remarks 1 Input Module (H) 2 Input Module (S) 3 Residual Voltage Release Control Module (H) 4 Residual Voltage Release Control Module (S) 5 Lower-Level Product 1 6 Lower-Level Product 2 …
[0100] Table 5 Software and Hardware Function List
[0101] Serial Number Hardware / Hardware Function 1 Input Module (H) Motor Operating Status Monitoring 2 Input Module (S) Motor Operating Status Monitoring 3 Residual Voltage Release Control Module (H) Residual Voltage Release Function 4 Residual Voltage Release Control Module (S) Residual Voltage Release Function 5 Lower-Level Product 1 Live Detection of Motor 6 Lower-Level Product 2 Live Monitoring of Circuit …
[0102] The failure analysis module is also used to define failure modes according to each function in the second product analysis tree, generate a failure mode library, and the failure mode library is used to select failure modes when performing failure analysis on each function and each sub-function in the second product analysis tree.
[0103] The failure analysis module is also used to input the severity S score of the failure consequence.
[0104] The product function determination module is also used to input the frequency F of use of each function in the function list.
[0105] The control analysis module is also used to input the controllability C of each function.
[0106] The risk analysis module is used to visually display the AP levels of each function.
[0107] In the risk analysis of this application, control measures can be taken for failure causes, failure modes, and failure consequences. The descriptions of the three types of measures are as follows:
[0108] 1) Preventive measure PC: Preventive control method taken before the occurrence of a failure to reduce the probability of failure.
[0109] 2) Detection measure DC: Detection method taken when or after the occurrence of a failure to discover the failure in a timely and accurate manner.
[0110] 3) Response measure RC: Containment or corrective measure taken after the occurrence of a failure to mitigate the impact of the failure.
[0111] The above three types of control measures can all be divided into two types:
[0112] 1) Functions or attributes inherent in the product, such as the product's self-error prevention function, self-diagnosis function, and self-response function. These measures are ultimately reflected in the structure and function of the product.
[0113] 2) Methods applied externally to the product, such as Computer Aided Engineering (CAE), testing, and maintenance methods. These measures are ultimately reflected in the company's operating standards.
[0114] Based on the above three types of measures, the controllability C of each function is evaluated. The AP level is defined by comprehensively considering the severity S, frequency F, and controllability C, and the AP level distribution is visually displayed. The controllability C specifically refers to the comprehensive effectiveness of preventive measures, detection measures, and monitoring measures. The controllability is a user input value.
[0115] Among them, S is divided into 4 levels: 0 - 3; F is divided into 5 levels: 0 - 4; C is divided into 4 levels: 0 - 3.
[0116] The FMEA report includes: concerned element function, concerned element structure, sub-structure name, sub-structure function, sub-structure characteristics, failure consequences, failure mode, failure cause, preventive measure, detection measure, response measure, and AP level.
[0117] Each sub-function has one or more failure modes, and each failure mode has a corresponding failure consequence and S value. The S value of this function should take the maximum S value.
[0118] Each sub-function has a usage frequency and a corresponding F value.
[0119] Each sub-function has a controllability C, which is determined based on the control measures adopted by this function and the lower-level functions.
[0120] The S value follows the rule of top-down transmission.
[0121] The F value and C value follow the rule of bottom-up transmission. The F value takes the maximum F value among this function and the lower-level sub-functions.
[0122] The interface list defines the input and output relationships between internal structures, as well as between internal and external structures.
[0123] Data or signals are transmitted between interfaces. After defining the interfaces through white-box block diagrams, these transmitted data or signals can be directly defined to form an interface function list.
[0124] For example: After defining the interface between A and B, if A transmits parameter c to B, then a function node named "Output" will be automatically generated under A, with a characteristic node named "Parameter (c)" below it. There will be a virtual sub-structure named "Input" after B, and there is a characteristic node named "Parameter (c)" under this node; all output parameters will be summarized under the output function node, and all input parameters will be summarized under the virtual structure node of the input.
[0125] Both functions and structures can be split and combined. Structure is essentially a combination of functions, and the combination of one or more functions forms a structure. The combination of functions at different levels forms structure names at different levels, such as system, subsystem, module, component, function, etc. Structure is habitually a tree structure. One structure can have multiple sub-structures, and one sub-structure has only one parent structure.
[0126] Functions may be in a network structure. One upper-level function may be associated with multiple lower-level functions, and one lower-level function may also be associated with multiple upper-level functions.
[0127] When converting a structure into a function, it is equivalent to converting it into a function point at the upper level.
[0128] When converting a function into a structure, it is equivalent to converting it into a structure point at the lower level.
[0129] Based on the same inventive concept, the embodiment of the present application also provides a method for performing function-based product FMEA analysis for implementing the function-based product FMEA analysis system involved above. The implementation solutions provided by this method for solving problems are similar to the implementation solutions recorded in the above method. Therefore, the specific limitations in one or more embodiments of the function-based product FMEA analysis method provided below can refer to the limitations on the function-based product FMEA analysis system in the above text, and will not be repeated here.
[0130] In an exemplary embodiment, as Figure 12 shown, a method for performing function-based product FMEA analysis is provided. The function-based product FMEA analysis method applies the function-based product FMEA analysis system, and the function-based product FMEA analysis method includes the following steps.
[0131] Step 101: Determine the function list and function block diagram of the target product based on the requirement list of the target product.
[0132] Step 102: Determine the structure corresponding to each function in the function list. If the structure corresponding to a function includes sub-structures, determine the sub-structures of this structure. Each structure and each sub-structure form the first product analysis tree.
[0133] Step 103: Match the sub-structures in the first product analysis tree with the corresponding sub-functions to obtain the second product analysis tree.
[0134] Focus on a certain function to define the structure and sub-structures. After all functions have defined the structure and sub-structures, the second product analysis tree is automatically output. The relationship between the first product analysis tree and the second product analysis tree can be transformed into each other.
[0135] Step 104: Conduct failure analysis on each function and each sub-function in the second product analysis tree, and output the failure causes, failure modes, and failure consequences of each function and each sub-function.
[0136] Step 105: Add control measures to the failure causes, failure modes, and failure consequences. The control measures include preventive measures, detection measures, and response measures.
[0137] Step 106: Determine the AP level corresponding to the failure of each function according to the usage frequency, controllability, and severity of the failure consequences of each function.
[0138] Step 107: When the AP level of a function is greater than the set level, add optimization measures to this function. The optimization measures include preventive measures, detection measures, and response measures.
[0139] Step 108: Output the FMEA report of the target product.
[0140] In addition to Step 101 of this application, it also includes: clearly defining the project scope and time plan based on the analysis object, creating a team, assigning task roles, collecting customer requirements and lessons learned. Taking the focused product as the analysis object, identifying external objects related to this object.
[0141] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification.
[0142] In this article, specific examples are used to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. At the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manners and application scopes. To sum up, the content of this specification should not be construed as a limitation to this application.
Claims
1. A function-based product FMEA analysis system, characterized in that The function-based product FMEA analysis system includes: A product function determination module, configured to determine a function list and a function block diagram of the target product based on a requirements list of the target product; A product structure determination module, configured to determine the structure corresponding to each function in the function list. If the structure corresponding to a function includes sub-structures, determine the sub-structures of the structure. Each structure and each sub-structure form a first product analysis tree; A function expansion module, configured to match corresponding sub-functions to the sub-structures in the first product analysis tree to obtain a second product analysis tree; A failure analysis module, configured to perform failure analysis on each function and each sub-function in the second product analysis tree, and output the failure causes, failure modes, and failure consequences of each function and each sub-function; A control analysis module, configured to add control measures to the failure causes, failure modes, and failure consequences. The control measures include preventive measures, detection measures, and response measures; A risk assessment module, configured to determine the AP level corresponding to the failure of each function according to the usage frequency, controllability, and severity of the failure consequence of each function; An optimization and improvement module, configured to add optimization measures to a function when the AP level of the function is greater than a set level. The optimization measures include preventive measures, detection measures, and response measures; A result documentation module, configured to output the FMEA report of the target product.
2. The product FMEA analysis system based on function according to claim 1, wherein The function-based product FMEA analysis system further includes: A requirements list determination module, configured to determine a requirements list of the target product according to the connection relationship between the target product and each preset external object.
3. The product FMEA analysis system based on functions according to claim 2, wherein The product function determination module includes a function conversion unit and a function decomposition unit; The function conversion unit is configured to convert the connection relationship between the target product and each preset external object into an internal function or an internal interface function of the product; The function decomposition unit is configured to decompose each of the internal functions or the internal interface functions of the product. The decomposed functions form the function list.
4. The product FMEA analysis system based on functions according to claim 1, wherein The product function determination module is further configured to perform P-diagram analysis on each function in the function list to determine the function characteristics of each function.
5. The product FMEA analysis system based on functions according to claim 2, wherein The product structure determination module is further configured to draw external interfaces and internal interfaces, and output an interface list. The external interface is a connection interface between a preset external object and a sub-structure, and the internal interface is a connection interface between sub-structures.
6. The product FMEA analysis system based on functions according to claim 1, wherein The failure analysis module is further configured to define failure modes according to each function in the second product analysis tree, generate a failure mode library, and the failure mode library is used to select failure modes when performing failure analysis on each function and each sub-function in the second product analysis tree.
7. The product FMEA analysis system based on function according to claim 1, characterized in that The failure analysis module is further configured to input the severity score of the failure consequence.
8. The product FMEA analysis system based on functions according to claim 1, characterized in that The product function determination module is further configured to input the usage frequency of each function in the function list.
9. The product FMEA analysis system based on functions according to claim 1, wherein The control analysis module is further configured to input the controllability of each function and visually display the AP level of each function.
10. A function-based product FMEA analysis method, characterized in that, The function-based product FMEA analysis method applies the function-based product FMEA analysis system described in claims 1-9. The function-based product FMEA analysis method includes: Determine the function list and function block diagram of the target product based on the requirement list of the target product; Determine the structure corresponding to each function in the function list. If the structure corresponding to the function includes sub-structures, determine the sub-structures of the structure. Each structure and each sub-structure constitute the first product analysis tree; Match the sub-structures in the first product analysis tree with the corresponding sub-functions to obtain the second product analysis tree; Conduct a failure analysis on each function and each sub-function in the second product analysis tree, and output the failure causes, failure modes, and failure consequences of each function and each sub-function; Add control measures to the failure causes, failure modes, and failure consequences. The control measures include preventive measures, detection measures, and response measures; Determine the AP level corresponding to the failure of each function according to the usage frequency, controllability, and severity of the failure consequence of each function; When the AP level of a function is greater than the set level, add optimization measures to the function. The optimization measures include preventive measures, detection measures, and response measures; Output the FMEA report of the target product.