FMEA and RUL combined industrial equipment multi-level health assessment method

Abstract

The invention discloses an FMEA and RUL combined industrial equipment multi-level health assessment method, and belongs to the field of intelligent operation and maintenance of industrial equipment. The invention provides a quantitative evaluation method which fully combines FMEA and RUL for health management and life evaluation during long-term operation of the industrial equipment, and can establish the influence of the weight caused by the corresponding fault mode on the health state score according to the design, monitoring, operation, inspection and test data of different parts, suites and systems of the industrial equipment. Multi-level and structured factors are considered, and the health state of the industrial equipment is estimated. The method has the advantages of being clear in principle, comprehensive in structure, scientific and effective, through combination of the two advantageous methods, the multi-dimensional health state comprehensive method from transverse health management to longitudinal life evaluation of the industrial equipment is established, and a beneficial thought is provided for solving the problem of life evaluation of the complex industrial equipment.

Description

Technical Field

[0001] The present invention relates to the field of intelligent operation and maintenance of industrial equipment, and in particular to a multi-level health assessment method for industrial equipment. Background Art

[0002] Industrial equipment has a complex structure, multiple levels, and a harsh operating environment. The health status of the equipment is related to many factors. It is very difficult to evaluate the operating status and remaining service life of industrial equipment and its key components.

[0003] There are many classic methods for the health management of industrial equipment. Among them, the failure mode and effects analysis (FMEA) method can comprehensively consider the relationship between various components and comprehensively obtain the health information of industrial assemblies, so it has been applied to health management to a certain extent. However, since it is difficult to solve the remaining useful life (RUL) of each component, it is very difficult to master the health status of the unit and requires knowledge of the equipment mechanism. Therefore, if the RUL calculation method is not considered, it is difficult to conduct an effective multi-level component remaining life assessment.

[0004] By combining FMEA and RUL methods, we can not only consider the hierarchical connections between components, but also deeply calculate the remaining life of key components, thus providing an effective idea for the health assessment of industrial equipment. Summary of the invention

[0005] The purpose of the present invention is to propose a multi-level health assessment method for industrial equipment combining FMEA and RUL. The technical solution of the present invention includes the following steps:

[0006] S1. Define N as the maximum number of layers of industrial equipment sub-components, n as the number of layers of industrial equipment sub-components (n = 1, 2, ..., N), A in Number the ith subcomponent of the nth layer;

[0007] S2. Definition B in For subcomponent A in The total number of corresponding failure modes, F kin For subcomponent A in The corresponding k-th failure mode, S kin F is the failure mode kin The corresponding severity, O kin F is the failure mode kin The corresponding probability of occurrence, D kin F is the failure mode kin Corresponding detectability,RPN kin F is the failure mode kin The following FMEA risk priority score is expressed as:

[0008] RPN kin =Skin ×O kin ×D kin (k=1,2,·…·B in )

[0009] S3. Define RPN in For component A in The FMEA risk priority score is expressed as:

[0010]

[0011] S4. Define RUL kin F is the failure mode kin Remaining useful life, RUL in For component A in The remaining useful life is expressed as:

[0012]

[0013] S5. Define HSI in For component A in Health status score, RUL int,in For component A in The initial remaining useful life is expressed as:

[0014]

[0015] S6. Through the above steps, the RUL of all components in the nth layer can be obtained. in and HSI in , for the i-th component A in the n-1th layer i(n-1) Health Status Score (HSI) i(n-1) , using component A i(n-1) The corresponding RUL of the next layer kn and HSI kn Solve and define B i(n-1) For subcomponent A i(n-1) The corresponding total number of parts is expressed as:

[0016]

[0017] S7. Repeat the above steps to obtain the health status score of each component in each layer, until the HSI of the top-level component is obtained. i1 , expressed as:

[0018]

[0019] The beneficial effects of the present invention are:

[0020] The present invention proposes a multi-level health assessment method for industrial equipment combining FMEA and RUL. Through this innovative method, the following technical effects can be achieved:

[0021] 1. Establish the relationship between the life of a single component and the health of multiple components. Based on in-depth consideration of the life of a single component and comprehensive consideration of the relationship between multiple components, the overall health status of industrial equipment is obtained to increase the accuracy of the results.

[0022] 2. A general method suitable for the health assessment of industrial equipment. Through multi-level component relationships, combined with FMEA and RUL methods, a general method that can be effectively applied to various types of industrial equipment, such as power generation equipment, machine tool equipment and other large equipment, is established. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Flow chart of the multi-level health assessment method for industrial equipment combining FMEA and RUL. DETAILED DESCRIPTION

[0024] The present application is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present application.

[0025] A multi-level health assessment method for industrial equipment combining FMEA and RUL. The specific implementation steps are as follows:

[0026] S1. Define N as the maximum number of layers of industrial equipment sub-components, n as the number of layers of industrial equipment sub-components (n = 1, 2, ..., N), A in Number the ith subcomponent of the nth layer;

[0027] S2, such as Figure 1 As shown, definition B in For subcomponent A in The total number of corresponding failure modes, F kin For subcomponent A in The corresponding kth failure mode, S kin F is the failure mode kin The corresponding severity, O kin F is the failure mode kin The corresponding probability of occurrence, D kin F is the failure mode kin Corresponding detectability,RPN kin F is the failure mode kin The following FMEA risk priority score is expressed as:

[0028] RPN kin =S kin ×O kin ×D kin(k=1,2,·…·B in )

[0029] S3, such as Figure 1 As shown, define RPN in For component A in The FMEA risk priority score is expressed as:

[0030]

[0031] S4, such as Figure 1 As shown, define RUL kin F is the failure mode kin Remaining useful life, RUL in For component A in The remaining useful life is expressed as:

[0032]

[0033] S5, such as Figure 1 As shown, define HSI in For component A in Health status score, RUL int,in For component A in The initial remaining useful life is expressed as:

[0034]

[0035] S6, such as Figure 1 As shown, through the above steps, the RUL of all components in the nth layer can be obtained. in and HSI in , for the i-th component A in the n-1th layer i(n-1) Health Status Score (HSI) i(n-1) , using component A i(n-1) The corresponding RUL of the next layer kn and HSI kn Solve and define B i(n-1) For subcomponent A i(n-1) The corresponding total number of parts is expressed as:

[0036]

[0037] S7, such as Figure 1 As shown, repeat the above steps to obtain the health status score of each component in each layer, until the HSI of the top component is obtained. i1 , expressed as:

[0038]

[0039] In this implementation, it can be applied to the changes in RPN values ​​caused by different types of failure modes considering monitoring, inspection, and test data, as well as the changes in RUL of different components under design and operation data. Various types of data are fully comprehensively analyzed and the evaluation method is highly versatile.

[0040] The present invention is only an exemplary description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A multi-level health assessment method for industrial equipment combining FMEA and RUL, which features include: Follow these steps: S1. Define N as the maximum number of layers of industrial equipment sub-components, n as the number of layers of industrial equipment sub-components (n = 1, 2, ..., N), A in Number the ith subcomponent of the nth layer; S2. Definition B in For subcomponent A in The total number of corresponding failure modes, F kin For subcomponent A in The corresponding kth failure mode, S kin F is the failure mode kin The corresponding severity, O kin F is the failure mode kin The corresponding probability of occurrence, D kin F is the failure mode kin Corresponding detectability,RPN kin F is the failure mode kin The following FMEA risk priority score is expressed as: RPN kin =S kin ×O kin ×D kin (k=1,2,·…·B in ) S3. Define RPN in For component A in The FMEA risk priority score is expressed as: S4. Define RUL kin F is the failure mode kin Remaining useful life, RUL in For component A in The remaining useful life is expressed as: S5. Define HSI in For component A in Health status score, RUL int,in For component A in The initial remaining useful life is expressed as: S6. Through the above steps, the RUL of all components in the nth layer can be obtained. in and HSI in , for the i-th component A in the n-1th layer i(n-1) Health Status Score (HSI) i(n-1) , using component A i(n-1) The corresponding RUL of the next layer kn and HSI kn Solve and define B i(n-1) For subcomponent A i(n-1) The corresponding total number of parts is expressed as: S7. Repeat the above steps to obtain the health status score of each component in each layer, until the HSI of the top-level component is obtained. i1 , expressed as:

Images