CN-122021307-A - LRU and PHM scheme design method

CN122021307ACN 122021307 ACN122021307 ACN 122021307ACN-122021307-A

Abstract

The invention relates to the technical field of equipment research, development and manufacturing, in particular to a design method of LRU and PHM schemes, which comprises the steps of obtaining a system function architecture model of target equipment and a fault mode library of the equipment, carrying out fault mode injection on each unit of the target equipment in the system function architecture model based on the fault mode library, carrying out fault transfer simulation by utilizing an FCM algorithm to generate a fault transfer matrix, initially screening a plurality of maintenance candidate units from each unit of the target equipment in the system function architecture model, analyzing the candidate maintenance units by utilizing a decoupling algorithm, determining a final LRU list according to the analysis result of the decoupling algorithm, and generating a PHM scheme for equipment state monitoring. The invention realizes forward maintainability design, completes the determination of the LRU in the equipment design stage, breaks through the traditional reverse mode of 'feedback before use', plans the maintenance key point in advance, and reduces the later maintenance risk from the source.

Inventors

JIANG AIHUA

Assignees

南京学森软件科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (8)

1. The design method of the LRU and PHM scheme is characterized by comprising the following steps: Acquiring a system function architecture model of target equipment and a fault mode library of the equipment, wherein the system function architecture model comprises a plurality of units in the target equipment and physical quantity input-output relations among the units, and the fault mode library at least comprises fault modes corresponding to the units and grading information of the fault modes; performing fault mode injection on each unit of target equipment in the system function architecture model based on the fault mode library, and performing fault transfer simulation by using an FCM algorithm to generate a fault transfer matrix; Based on the grading information of each fault mode in the fault mode library, a plurality of maintenance candidate units are preliminarily screened from each unit of target equipment in a system function architecture model; Based on the fault transmission matrix, analyzing the candidate maintenance units by using a decoupling algorithm, and judging whether fault isolation can be realized among the candidate maintenance units; Determining a final LRU list according to the analysis result of the decoupling algorithm; and obtaining fault decoupling characteristics corresponding to the final LRU list to generate a PHM scheme for equipment state monitoring.
2. The method for designing LRU and PHM scheme as claimed in claim 1, wherein the step of performing fault mode injection on each unit of the target equipment in the system function architecture model based on the fault mode library and performing fault transfer simulation using FCM algorithm to generate a fault transfer matrix includes: Running an FCM algorithm to simulate a propagation path of the fault mode in the system function architecture model based on each fault injected in the function architecture model, and recording a fault source unit in the propagation path; calculating the influence degree of the fault on the output physical quantity of each unit in the target equipment based on the propagation path, and synchronously recording each affected unit; And constructing a fault transfer matrix based on the propagation path and the influence degree.
3. The LRU and PHM scheme design method as claimed in claim 1, wherein the step of primarily screening a plurality of candidate units from the units of the target equipment in the system function architecture model based on the fault mode scoring information in the fault mode library includes: extracting scoring information corresponding to each fault mode in the fault mode library, wherein the scoring information at least comprises severity scoring, incidence scoring and measurable scoring; and screening a plurality of candidate units according to at least one of the severity score, the incidence score and the measurable score.
4. The LRU and PHM scheme design method as claimed in claim 3, further comprising performing a reliability centric repair analysis procedure on a plurality of said candidate units, said analysis procedure recommending and determining at least one repair strategy and repair class for each of said candidate units based on failure mode, failure impact and repair cost effectiveness, wherein said repair strategy class includes post repair, regular preventative repair, predictive preventative repair, repair class includes field repair, relay class repair, base class repair and direct discard handling.
5. The method for designing LRU and PHM scheme as claimed in claim 4, wherein said step of analyzing said candidate units using a decoupling algorithm based on said fault transfer matrix, determining whether fault isolation can be achieved between each candidate unit includes: Extracting fault characteristic information corresponding to each candidate unit from the fault transfer matrix; Performing differential analysis on fault characteristic information of different candidate units based on a decoupling algorithm, and calculating to obtain fault decoupling degree among the candidate units; And comparing the fault decoupling degree with a preset isolation threshold, if the fault decoupling degree is larger than the isolation threshold, judging that fault isolation can be realized between the corresponding candidate units, and if the fault decoupling degree is not larger than the isolation threshold, judging that fault isolation cannot be realized between the corresponding candidate units.
6. The LRU and PHM scheme design method as claimed in claim 5, wherein the determining the final LRU list according to the analysis result of the decoupling algorithm includes: taking the unit which can realize fault isolation with other candidate units as a determined LRU; A unit which cannot completely realize fault isolation but meets the preset fuzzy set judgment condition is taken as an acceptable LRU; eliminating the units which are judged to be incapable of realizing fault isolation and do not meet the fuzzy set condition from the system function architecture model, and then executing the step of primarily screening a plurality of candidate units from all units of target equipment in the system function architecture model again; and forming a final LRU list according to the determined LRU and the acceptable LRU.
7. The method of LRU and PHM scheme design as claimed in claim 6, wherein the step of obtaining fault decoupling characteristics corresponding to the final LRU list to generate the PHM scheme for equipment status monitoring includes: For each LRU in the final LRU list, obtaining a unit output physical quantity combination which is uniquely determined in the decoupling algorithm analysis process and used for identifying the LRU fault, and monitoring a strategy for each LRU configuration sensor based on the unit output physical quantity combination; Obtaining fault isolation judgment results corresponding to each LRU output by a decoupling algorithm, and determining the normal working fluctuation range of each physical quantity by combining quantized data of physical quantity combination output by a unit corresponding to the LRU in the fault transmission matrix; setting a health state threshold based on the normal working fluctuation range, and simultaneously, formulating a fault early warning rule according to a fault transmission path, influence degree and equipment use requirements; And carrying out structural integration on the sensor monitoring strategy, the health state threshold value and the fault early warning rule, and outputting a PHM monitoring scheme.
8. The LRU and PHM scheme design method as claimed in claim 7, further comprising a repair task sequence generating step after generating the PHM scheme for equipment status monitoring: determining a core link of a maintenance task of each LRU in the final LRU list by combining the corresponding maintenance strategy category and fault decoupling characteristics in the PHM scheme, wherein the core link at least comprises fault detection, implementation restoration, function verification and state recovery; matching corresponding technical content and resource requirements for each core link, including associating a sensor monitoring strategy and a fault early warning rule in the PHM scheme, and defining fault positioning logic of the fault detection link; matching the replacement or repair flow of the implementation repair link, the required tool and spare part specifications by combining the unit attribute of the LRU and the maintenance strategy category thereof, and setting the performance verification index of the function verification and state recovery link according to the physical quantity input-output relationship defined in the system function architecture model; Based on the technical content and resource requirements matched for each core link, the parameters of estimated man-hour and required personnel skill level are filled, and the parameters are connected in series according to the operation logic sequence to generate a standardized maintenance task sequence.

Description

LRU and PHM scheme design method Technical Field The invention relates to the technical field of equipment research, development and manufacturing, in particular to a design method of LRU and PHM schemes. Background In the field of equipment research, development and manufacturing, LRU (field replaceable unit) refers to a replaceable part which can be uniquely monitored in equipment, and the reasonable selection and excellent design of the LRU can effectively reduce the average repair time MTTR of the equipment, reduce the maintenance cost of the whole life cycle of the equipment, and simultaneously promote the use availability of the equipment, thereby bringing more convenient and economic experience to users. In order to quickly realize the replacement of the LRU, the LRU from which the fault is determined needs to be quickly diagnosed when equipment is failed, and therefore, fault decoupling is required to be realized in the test process of judging the faults of each LRU, and the component can be provided with the condition as the LRU. The determination of the LRU in the current equipment field mainly adopts a reverse process of 'first-use and then-feedback', namely, after equipment is put into the market for use, the parts can be used as the LRU step by step according to experience accumulated in the actual use process. The method has the obvious defects that 1, due to the lack of early-stage accurate planning, frequent faults can occur in the using process of equipment and the equipment is difficult to quickly position, so that the maintenance cost is greatly increased, meanwhile, the using cost is also increased, 2, the fault positioning is not timely and inconvenient to replace, so that the time of equipment shutdown due to faults is prolonged, the normal use of the equipment is seriously influenced, 3, parts and maintenance contents which are required to be replaced regularly or are replaced based on state monitoring cannot be definitely in the design stage of the equipment, the planning of multiple physical quantity measurement contents in advance is difficult, and further, the unique determination of the fault LRU (least recently used) cannot be realized in the design stage, namely fault isolation is realized, and hidden hazards are buried for later use and maintenance of the equipment. Disclosure of Invention The main purpose of the present invention is to provide a design method for LRU and PHM schemes, which aims to solve the technical problems set forth in the above background art. The invention provides a design method of LRU and PHM schemes, comprising the following steps: Acquiring a system function architecture model of target equipment and a fault mode library of the equipment, wherein the system function architecture model comprises a plurality of units in the target equipment and physical quantity input-output relations among the units, and the fault mode library at least comprises fault modes corresponding to the units and grading information of the fault modes; performing fault mode injection on each unit of target equipment in the system function architecture model based on the fault mode library, and performing fault transfer simulation by using an FCM algorithm to generate a fault transfer matrix; Based on the grading information of each fault mode in the fault mode library, a plurality of maintenance candidate units are preliminarily screened from each unit of target equipment in a system function architecture model; Based on the fault transmission matrix, analyzing the candidate maintenance units by using a decoupling algorithm, and judging whether fault isolation can be realized among the candidate maintenance units; Determining a final LRU list according to the analysis result of the decoupling algorithm; and obtaining fault decoupling characteristics corresponding to the final LRU list to generate a PHM scheme for equipment state monitoring. The invention further provides that the step of injecting the fault mode into each unit of the target equipment in the system function architecture model based on the fault mode library and carrying out fault transfer simulation by using an FCM algorithm to generate a fault transfer matrix comprises the following steps: Running an FCM algorithm to simulate a propagation path of the fault mode in the system function architecture model based on each fault injected in the function architecture model, and recording a fault source unit in the propagation path; calculating the influence degree of the fault on the output physical quantity of each unit in the target equipment based on the propagation path, and synchronously recording each affected unit; And constructing a fault transfer matrix based on the propagation path and the influence degree. The invention further provides that the step of primarily screening a plurality of candidate units from units of target equipment in a system function architecture model based on the grading information