CN106528723A - Fault tree-based numerical control machine tool fault removal scheme judgment indication method - Google Patents
Fault tree-based numerical control machine tool fault removal scheme judgment indication method Download PDFInfo
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Abstract
The invention provides a fault tree-based numerical control machine tool fault removal scheme judgment indication method. According to the method, an input target character string used for describing a fault phenomenon is subjected to fault state description word extraction so as to search for potential target fault event nodes from a fault tree; various fault monitoring index parameters corresponding to potential fault bottom event nodes are compared with input various current running state parameters of a numerical control machine tool; potential fault bottom event nodes corresponding to obtained abnormal running state parameters are determined as confirmed fault bottom event nodes; fault removal scheme texts of corresponding fault types of the confirmed fault bottom event nodes are extracted according to a corresponding relationship in the fault types and used for indication, so that the fault type identification efficiency is improved, and the fault type possibility identification comprehensiveness and the fault type confirmation accuracy are ensured; and the method can be used for assisting in improving convenience of assisting in field repair or remote repair of the numerical control machine tool.
Description
Technical field
The invention belongs to mechanical fault diagnosis and computer intelligence technology of identification field, more particularly to it is a kind of based on fault tree
Fault of numerical control machine tool cancellation scheme differentiate indicating means.
Background technology
Digit Control Machine Tool is the letter of numerically-controlled machine tool (Computer numerical control machine tools)
Claim, be a kind of automated machine tool equipped with program control system.The control system logically can process with control coding or
Other symbolic instruction regulated procedures, and decoded, represented with the numeral of code, numerical control dress is input into by information carrier
Put.Jing calculation process sends various control signals by numerical control device, controls the action of lathe, shape by drawing and chi
It is very little, automatically part is processed.Digit Control Machine Tool preferably solves the part processing of complexity, precision, small lot, multi items
Problem, is a kind of flexible, dynamical automated machine tool, represents the developing direction of modern machine control technology, is a kind of
Typical electromechanical integrated product.
During the use of Digit Control Machine Tool, user is most concerned with how shifting to an earlier date when equipment breaks down sign signal
Diagnosed and how to be keeped in repair etc. in time upon a fault.But, today's numerical control lathe China application with
Safeguard that present situation also allows of no optimist, be mainly manifested in following aspects：
(1) substantial amounts of Digit Control Machine Tool, various in style, and the workload of plant maintenance and maintenance is big；
(2) Digit Control Machine Tool integrates mechanical, electrical, liquid, gas, with high content of technology, once break down, Digit Control Machine Tool user with
It is difficult to solve its all problems by means of the technical force of itself.
(3) Heuristics of maintenance personal is largely dependent upon to the diagnosis of Digit Control Machine Tool, and these Heuristicses
Typically exist only in the brain of maintenance personal, be unfavorable for the shared of diagnostic knowledge, while it also becomes restriction maintenance maintenance water
The flat bottleneck for further improving.
The maintenance of Digit Control Machine Tool at present is still by the way of traditional, once that is, Digit Control Machine Tool breaks down, it is necessary to rely on
Personnel are appointed to provide propping up for technical maintenance in the engineer's on-site maintenance having wide experience, or the integrated producer of Digit Control Machine Tool
Hold.So, the after-sale service personnel of one side Digit Control Machine Tool manufacturer have to run around all the time wears him out, and on the other hand, also extend failure and repair
The multiple stand-by period, delay the processing of Digit Control Machine Tool.
Therefore the suggestion for accurately identifying and providing Failure elimination to fault of numerical control machine tool how is realized, so as to assist as soon as possible
Digit Control Machine Tool user and maintenance personal eliminate fault of numerical control machine tool, and becoming this area has problem to be solved.
The content of the invention
For the above-mentioned problems in the prior art, the invention provides a kind of fault of numerical control machine tool based on fault tree
Cancellation scheme differentiate indicating means so that Digit Control Machine Tool diagnostic software can fast and accurately identify failure cause, in order to
The Failure elimination suggestion text that completes is write with corresponding in database, the Failure elimination scheme of Digit Control Machine Tool is drawn.
For achieving the above object, present invention employs following technological means：
Fault of numerical control machine tool cancellation scheme based on fault tree differentiates indicating means, pre-builds the fault tree of Digit Control Machine Tool
Information knowledge storehouse, index parameter standard database and Failure elimination scheme database；Store in the fault tree information knowledge base
Have a fault tree of Digit Control Machine Tool, the fault tree be used to recording the system-level of each function system in Digit Control Machine Tool, subsystem irrespective of size,
Event in module level and parts level between the event of failure node and different faults event node of various different faults classifications
Barrier logic causality, and the malfunction descriptor of the corresponding failure event that is stored with for each event of failure node correspondence,
And foundation has the fault logic causality between variant event of failure node；The index parameter standard database record has
Various lathe running state parameters in fault tree corresponding to each event of failure node are used as malfunction monitoring index parameter, and record
There is normal envelope value of every malfunction monitoring index parameter under Digit Control Machine Tool normal operating condition；The Failure elimination side
Case database purchase has each corresponding Failure elimination scheme text of the variant fault category of Digit Control Machine Tool, each Failure elimination
Scheme text is to state the Failure elimination scheme of its corresponding failure classification；
Then, perform the differentiation to fault of numerical control machine tool cancellation scheme as follows to indicate：
A) provide phenomenon of the failure and describe typing operation and Digit Control Machine Tool running state parameter input operation, by the failure of typing
Phenomenon describes text-string as the target string of Fault Identification, and every Digit Control Machine Tool running state parameter of input is made
For the current operating conditions parameter of Digit Control Machine Tool；
B each malfunction descriptor stored in) transferring fault tree information knowledge base, is carried out with target string respectively
Contrast matching, obtain each malfunction descriptor matched with target string so as to extract, and determine match it is each
Corresponding event of failure node in each comfortable fault tree of individual malfunction descriptor, as target faults event node；
C) according to the failure between the fault tree recorded in fault tree information knowledge base and its variant event of failure node
Logic causality, finds out all bottom event nodes corresponding to each target faults event node of determination, is judged to potential
Failure bottom event node；
D each corresponding every malfunction monitoring of incipient fault bottom event node is found from index parameter standard database)
Index parameter, as incipient fault monitoring index parameter, and reads each incipient fault prison from index parameter standard database
The normal envelope value of index parameter is surveyed, is contrasted with every current operating conditions parameter of the Digit Control Machine Tool of input, will
Corresponding to the value of current operating conditions parameter each incipient fault monitoring index parameter item not within normal envelope value
Each incipient fault bottom event node be judged to confirm failure bottom event node；
E) the fault category each affiliated according to each confirmation failure bottom event node, from Failure elimination scheme database
The Failure elimination scheme text of each corresponding failure classification is transferred respectively, to the finger for carrying out fault of numerical control machine tool cancellation scheme
Show.
During the above-mentioned fault of numerical control machine tool cancellation scheme based on fault tree differentiates indicating means, as preferred concrete side
Case, step B) it is specially：
B1) order counts symbol i=1, makes alternative keywords vectorTarget string is assigned to into character string vector tg,
And each malfunction descriptor stored in transferring fault tree information knowledge base is assigned to basicvocabulary vector t0So that failure
Each malfunction descriptor in tree information knowledge storehouse is used as basicvocabulary vector t0In an element；
B2) take basicvocabulary vector t0In i-th element t0(i) and current character string vector tgCarry out contrast matching；If
Element t0I () is included in current character string vector tgIn, then execution step b3)；Otherwise, direct execution step b4)；
B3) by element t0I malfunction descriptor that () represents is added to alternative keywords vector tsIn, and from current
Character string vector tgMiddle rejecting element t0I the malfunction descriptor represented by (), forms new character string vector tg, then hold
Row step b4)；
B4) judge current character string vector tgWhether the number of characters guaranteed replacement has been less than presetting number of characters lower threshold
k；If so, then direct execution step b7)；Otherwise, execution step b5)；
B5) judge whether the value of current count symbol i has reached basicvocabulary vector t0Included in number of elements the upper limit
Value；If so, then direct execution step b7)；Otherwise, execution step b6)；
B6) order counts the value of symbol i from Jia 1, is then back to step b2)；
B7) calculate current alternative keywords vector tsWith the resolution K of target stringt：
Kt=Ks/Ktg；
Wherein, KsRepresent current alternative keywords vector tsWith the number of identical characters in target string, KtgRepresent
Character number in target string；Then judge the resolution KtValue whether be more than presetting resolution threshold k0；If
It is, then execution step b9)；Otherwise, execution step b8)；
B8) according to presetting order regulation rule adjustment basicvocabulary vector t0Putting in order for middle element, makes and counting
Symbol i=1, makes alternative keywords vectorAgain target string is assigned to into character string vector tg, it is then back to perform
Step b2)；
B9) by current alternative keywords vector tsIn each malfunction descriptor be judged to and target string phase
The malfunction descriptor of matching, it is determined that failure corresponding in each comfortable fault tree of each malfunction descriptor for matching
Event node, as target faults event node.
It is during the above-mentioned fault of numerical control machine tool cancellation scheme based on fault tree differentiates indicating means, preferably, described
Step b7) in, resolution threshold k0Value be 0.5～0.6.
It is during the above-mentioned fault of numerical control machine tool cancellation scheme based on fault tree differentiates indicating means, preferably, described
Step b8) in, presetting order regulation rule adopts the regulation rule of random reversed order.
During the above-mentioned fault of numerical control machine tool cancellation scheme based on fault tree differentiates indicating means, as preferred concrete side
Case, step D) it is specially：
D1) incipient fault bottom event matrix T is given by each incipient fault bottom event node valuation so that each incipient fault
Bottom event node is used as an element in the incipient fault bottom event matrix T；
D2 each corresponding every malfunction monitoring of incipient fault bottom event node is found from index parameter standard database)
Index parameter, as incipient fault monitoring index parameter；
D3 the normal envelope value of each incipient fault monitoring index parameter) is read from index parameter standard database, with
Every current operating conditions parameter of the Digit Control Machine Tool of input is contrasted, by the value of current operating conditions parameter not in normal shape
Each incipient fault monitoring index parameter combination within state value range is constituted and confirms malfunction monitoring index parameter set；
D4) the record according to index parameter standard database, confirms that each incipient fault bottom event node is each corresponding
Malfunction monitoring index parameter, and travel through all elements in incipient fault bottom event matrix T, by failure-description matrix T not with
In confirming malfunction monitoring index parameter set, each corresponding element of any incipient fault monitoring index parameter is rejected, so as to
To confirmation failure bottom event matrix T'；
D5) will confirm that each incipient fault bottom event node in failure bottom event matrix T' is judged to confirm failure bottom thing
Part node.
During the above-mentioned fault of numerical control machine tool cancellation scheme based on fault tree differentiates indicating means, as further improvement side
Case, step E) in, always according to value not within normal envelope value each of current operating conditions parameter it is potential therefore
Barrier monitoring index parameter, carries out probability analysis to each confirmation failure bottom event node using D-S evidence theory, obtains each confirmation
The probable value of failure bottom event node；When the instruction of fault of numerical control machine tool cancellation scheme is carried out, to Failure elimination scheme text
Recommendation probable value of the corresponding probable value for confirming failure bottom event node of affiliated fault category as Failure elimination scheme text
Indicated in the lump, or according to confirm failure bottom event node probable value sequence to indicate corresponding failure classification
Failure elimination scheme text be ranked up.
Compared to prior art, the present invention has the advantages that：
1st, during the fault of numerical control machine tool cancellation scheme based on fault tree of the invention differentiates indicating means, according to target word
When according with string extraction target faults event node, the inventive method is employed and circulates each included during contrast matches target string
The mode of malfunction descriptor, is converted into being mutually matched for word and word being mutually matched for sentence and sentence, and meets maximum similar
The principle of degree, then confirms each target faults event node according to each malfunction descriptor for matching, it is possible to increase mesh
The mark accuracy of event of failure Node extraction and comprehensive.
2nd, during the fault of numerical control machine tool cancellation scheme based on fault tree of the invention differentiates indicating means, obtained using confirmation
Each target faults event node corresponding to all bottom event nodes be judged to incipient fault bottom event node, as follow-up right
The identification basis of fault category, eliminates the interference that uncorrelated event of failure node is recognized to fault category, improves to event
The efficiency of barrier classification identification, while in turn ensure that to the comprehensive of fault category possibility identification.
3rd, it is during the fault of numerical control machine tool cancellation scheme based on fault tree of the invention differentiates indicating means, latent always according to each
In the corresponding every malfunction monitoring index parameter of failure bottom event node and every current operating conditions of the Digit Control Machine Tool of input
Parameter is contrasted, and eliminates related incipient fault bottom event node of the running state parameter within normal envelope value,
Obtain the incipient fault bottom event node corresponding to abnormal running state parameter to be judged to confirm failure bottom event node, it is ensured that
Accuracy to fault category identification.
4th, the fault of numerical control machine tool cancellation scheme based on fault tree of the invention differentiates that indicating means utilizes Failure elimination side
The fault category stored in case database describes text and confirms corresponding relation of the failure bottom event node on fault category, can
To extract the Failure elimination scheme text of corresponding failure classification to indicate according to failure bottom event node is confirmed, conveniently give
Digit Control Machine Tool user or the suggestion of maintenance personal's corresponding Failure elimination, are lifted to Digit Control Machine Tool in addition field maintenance or long-distance service
The convenience of assistance.
Description of the drawings
Fig. 1 is the FB(flow block) that fault of numerical control machine tool cancellation scheme of the present invention based on fault tree differentiates indicating means.
Fig. 2 be the present invention based on fault tree fault of numerical control machine tool cancellation scheme differentiate indicating means in step B) one kind
It is embodied as flow chart.
Fig. 3 be the present invention based on fault tree fault of numerical control machine tool cancellation scheme differentiate indicating means in step D) one kind
It is embodied as flow chart.
Specific embodiment
The present invention proposes a kind of fault of numerical control machine tool cancellation scheme based on fault tree and differentiates indicating means, and the method is special
Be not suitable for excluding the remote diagnosis system software of machine failure, event is carried out to the different faults situation for Digit Control Machine Tool
The differentiation of barrier type simultaneously indicates Failure elimination scheme, to assist lathe user to exclude machine failure as soon as possible, shortens because of equipment
Failure and he causes the time of equipment downtime, reduce loss, simultaneously for also can be to reduce for CNC Machine Tool Maintenance producer
The difficulty and maintenance cost of after-sale technical support, lifts the Digit Control Machine Tool competitiveness of product in market.
The fault of numerical control machine tool cancellation scheme based on fault tree of the present invention differentiates indicating means, needs to pre-build numerical control
The fault tree information knowledge base of lathe, index parameter standard database and Failure elimination scheme database；Know in fault tree information
Be stored with knowing storehouse the fault tree of Digit Control Machine Tool, and the fault tree is used for the system for recording each function system in Digit Control Machine Tool
The event of failure node and different faults event of various different faults classifications in level, subsystem irrespective of size, module level and parts level
Fault logic causality between node, and the failure of the corresponding failure event that is stored with for each event of failure node correspondence
State description word, and foundation has the fault logic causality between variant event of failure node；In index parameter criterion numeral
Various lathe running state parameters in faulty tree corresponding to each event of failure node are recorded as malfunction monitoring index according to storehouse
Parameter, and record has normal envelope value of every malfunction monitoring index parameter under Digit Control Machine Tool normal operating condition；
Failure elimination scheme database is stored with each corresponding Failure elimination scheme text of the variant fault category of Digit Control Machine Tool, often
Individual Failure elimination scheme text is to state the Failure elimination scheme of its corresponding failure classification.Then, then can be according to such as Fig. 1 institutes
The step of showing flow process performs the differentiation to fault of numerical control machine tool cancellation scheme and indicates：
A) provide phenomenon of the failure and describe typing operation and Digit Control Machine Tool running state parameter input operation, by the failure of typing
Phenomenon describes text-string as the target string of Fault Identification, and every Digit Control Machine Tool running state parameter of input is made
For the current operating conditions parameter of Digit Control Machine Tool.
Phenomenon of the failure provided in the step describes typing operation, can also may be used in the form of words input is provided
To adopt the typing form for providing that voice typing is converted to Word message, as long as typing and energy can be provided in prior art
Enough it is converted to phenomenon of the failure and describes the phenomenon of the failure of text-string and describes typing operation format；And provide in the step
Digit Control Machine Tool running state parameter input operation, can be in the form of word and data inputting, it would however also be possible to employ data pass
Defeated cable directly transmits the form of input, as long as input can be provided in prior art and every Digit Control Machine Tool operation shape is obtained
The Digit Control Machine Tool running state parameter input operation of state parameter.
B each malfunction descriptor stored in) transferring fault tree information knowledge base, is carried out with target string respectively
Contrast matching, obtain each malfunction descriptor matched with target string so as to extract, and determine match it is each
Corresponding event of failure node in each comfortable fault tree of individual malfunction descriptor, as target faults event node.
The idiographic flow of the step is as shown in Figure 2：
B1) order counts symbol i=1, makes alternative keywords vectorTarget string is assigned to into character string vector tg,
And each malfunction descriptor stored in transferring fault tree information knowledge base is assigned to basicvocabulary vector t0So that failure
Each malfunction descriptor in tree information knowledge storehouse is used as basicvocabulary vector t0In an element；
B2) take basicvocabulary vector t0In i-th element t0(i) and current character string vector tgCarry out contrast matching；If
Element t0I () is included in current character string vector tgIn, then execution step b3)；Otherwise, direct execution step b4)；
B3) by element t0I malfunction descriptor that () represents is added to alternative keywords vector tsIn, and from current
Character string vector tgMiddle rejecting element t0I the malfunction descriptor represented by (), forms new character string vector tg, then hold
Row step b4)；
B4) judge current character string vector tgWhether the number of characters guaranteed replacement has been less than presetting number of characters lower threshold
k；If so, then direct execution step b7)；Otherwise, execution step b5)；
B5) judge whether the value of current count symbol i has reached basicvocabulary vector t0Included in number of elements the upper limit
Value；If so, then direct execution step b7)；Otherwise, execution step b6)；
B6) order counts the value of symbol i from Jia 1, is then back to step b2)；
B7) calculate current alternative keywords vector tsWith the resolution K of target stringt：
Kt=Ks/Ktg；
Wherein, KsRepresent current alternative keywords vector tsWith the number of identical characters in target string, KtgRepresent
Character number in target string；Then judge the resolution KtValue whether be more than presetting resolution threshold k0；If
It is, then execution step b9)；Otherwise, execution step b8)；Here, resolution threshold k0Can value be preferably 0.5～0.6；
B8) according to presetting order regulation rule adjustment basicvocabulary vector t0Putting in order for middle element, makes and counting
Symbol i=1, makes alternative keywords vectorAgain target string is assigned to into character string vector tg, it is then back to perform
Step b2)；Here, regulation rule of the presetting order regulation rule using random reversed order, it is of course also possible to use
Other presetting order regulation rules；
B9) by current alternative keywords vector tsIn each malfunction descriptor be judged to and target string phase
The malfunction descriptor of matching, it is determined that failure corresponding in each comfortable fault tree of each malfunction descriptor for matching
Event node, as target faults event node.
Can see, when target faults event node is extracted according to target string, the inventive method employs circulation
The mode of each malfunction descriptor included in contrast matching target string, is converted into word sentence and being mutually matched for sentence
With being mutually matched for word, and the principle of maximum similarity is met, then confirmed according to each malfunction descriptor for matching
Each target faults event node, it is possible to increase the accuracy and comprehensive that target faults event node is extracted.
C) according to the failure between the fault tree recorded in fault tree information knowledge base and its variant event of failure node
Logic causality, finds out all bottom event nodes corresponding to each target faults event node of determination, is judged to potential
Failure bottom event node.
Bottom event is the reason for only resulting in other events in failure tree analysis (FTA) event, finds each target faults event node institute
Corresponding all bottom event nodes, the reason for just have found be possible to causing trouble and occur；Therefore, the step is make use of from mesh
During in mark character string, each comfortable fault tree of each malfunction descriptor for obtaining is extracted in matching, corresponding event of failure node is made
For target faults event node, and find out all bottom event nodes corresponding to each target faults event node be judged to it is potential
Failure bottom event node, as identification basis subsequently to fault category, to carry out further really in processing in subsequent step
Recognize, thus, eliminate the interference that uncorrelated event of failure node is recognized to fault category, improve to fault category identification
Efficiency, while in turn ensure that to the comprehensive of fault category possibility identification.
D each corresponding every malfunction monitoring of incipient fault bottom event node is found from index parameter standard database)
Index parameter, as incipient fault monitoring index parameter, and reads each incipient fault prison from index parameter standard database
The normal envelope value of index parameter is surveyed, is contrasted with every current operating conditions parameter of the Digit Control Machine Tool of input, will
Corresponding to the value of current operating conditions parameter each incipient fault monitoring index parameter item not within normal envelope value
Each incipient fault bottom event node be judged to confirm failure bottom event node.
The idiographic flow of the step is as shown in Figure 3：
D1) incipient fault bottom event matrix T is given by each incipient fault bottom event node valuation so that each incipient fault
Bottom event node is used as an element in the incipient fault bottom event matrix T；
D2 each corresponding every malfunction monitoring of incipient fault bottom event node is found from index parameter standard database)
Index parameter, as incipient fault monitoring index parameter；
D3 the normal envelope value of each incipient fault monitoring index parameter) is read from index parameter standard database, with
Every current operating conditions parameter of the Digit Control Machine Tool of input is contrasted, by the value of current operating conditions parameter not in normal shape
Each incipient fault monitoring index parameter combination within state value range is constituted and confirms malfunction monitoring index parameter set；
D4) the record according to index parameter standard database, confirms that each incipient fault bottom event node is each corresponding
Malfunction monitoring index parameter, and travel through all elements in incipient fault bottom event matrix T, by failure-description matrix T not with
In confirming malfunction monitoring index parameter set, each corresponding element of any incipient fault monitoring index parameter is rejected, so as to
To confirmation failure bottom event matrix T'；
D5) will confirm that each incipient fault bottom event node in failure bottom event matrix T' is judged to confirm failure bottom thing
Part node.
Can see, in this step according to the corresponding every malfunction monitoring index ginseng of each incipient fault bottom event node
Number is contrasted with every current operating conditions parameter of the Digit Control Machine Tool of input, eliminates running state parameter in normal condition
Related incipient fault bottom event node within value range, carries out the knowledge of fault category so as to be confirmed failure bottom event node
Not, it is ensured that the accuracy to fault category identification.
E) the fault category each affiliated according to each confirmation failure bottom event node, from Failure elimination scheme database
The Failure elimination scheme text of each corresponding failure classification is transferred respectively, to the finger for carrying out fault of numerical control machine tool cancellation scheme
Show.
Text is described using the fault category stored in Failure elimination scheme database to exist with confirmation failure bottom event node
Corresponding relation on fault category, can extract the Failure elimination of corresponding failure classification according to failure bottom event node is confirmed
Scheme text is to indicate, convenient to advise to Digit Control Machine Tool user or the corresponding Failure elimination of maintenance personal, is lifted to numerical control machine
The bed convenience that in addition field maintenance or long-distance service are assisted.
Certainly, indicating means is differentiated using the above-mentioned fault of numerical control machine tool cancellation scheme based on fault tree of the present invention,
Presence cannot get the possibility that specific fault of numerical control machine tool cancellation scheme is indicated.
For example, in above-mentioned steps b1)～b9) processing procedure in, if adjustment basicvocabulary vector t0The row of middle element
The adjustment number of times of row order reaches presetting adjustment number of times limit value, but alternative keywords vector tsWith the identification of target string
Degree KtStill fail more than presetting resolution threshold k0, then can design and jump out step B) circulation, execution step F)：
F) prompting fails to show that the phenomenon of the failure of current typing describes the fault of numerical control machine tool corresponding to text-string and disappears
Except scheme.
Now can then can be shown that the malfunction descriptor stored in fault tree information knowledge base is also insufficient to comprehensively, fail
The malfunction descriptor that text-string extracts preparation enough is described according to the phenomenon of the failure of typing, it is thus possible to need to mend
Fill and adjust basicvocabulary database；Or, it is also possible to show that the phenomenon of the failure of current typing describes text-string for event
The description of barrier phenomenon is not accurate enough, needs to re-type phenomenon of the failure description.
Additionally, fault of numerical control machine tool cancellation scheme of the present invention based on fault tree differentiates that indicating means can also be in addition further
Improvement.For example, E the step of above-mentioned handling process) in, except each affiliated according to each confirmation failure bottom event node
Fault category transfers the Failure elimination scheme text of each corresponding failure classification in addition from Failure elimination scheme database respectively
Outside instruction, can be supervised with each incipient fault according to the value of current operating conditions parameter not within normal envelope value
Index parameter is surveyed, probability analysis is carried out to each confirmation failure bottom event node using D-S evidence theory, each confirmation failure is obtained
The probable value of bottom event node；Evidence theory is a kind of important method for realizing Multi-information acquisition, and by Depew, this is special
(A.P.Dempster) proposed in 1967 first, and the one kind further grown up by his student Sha Fo (G.Shafer)
Probabilistic theory is managed, therefore is also called the result (evidence) that D-S is theoretical, can be directed to after event generation, sought event and send out
Raw main cause (hypothesis), is a kind of ripe art methods that reason and probability analysis are carried out based on evidence, this
It is bright directly DS Evidence theory models can be applied in the probability analysis of fault of numerical control machine tool classification identification；Thus, entering
During the instruction of row fault of numerical control machine tool cancellation scheme, it becomes possible to the corresponding confirmation of the affiliated fault category of Failure elimination scheme text
The probable value of failure bottom event node indicated in the lump as the recommendation probable value of Failure elimination scheme text, or according to true
The sequence for recognizing the probable value of failure bottom event node is carried out to the Failure elimination scheme text of the corresponding failure classification of instruction
Sequence.Since so, provide to Digit Control Machine Tool user or maintenance personal except the Failure elimination scheme text for indicating can be passed through
Outside Failure elimination suggestion, additionally it is possible to by indicating to recommend probable value or the sequence to Failure elimination scheme text, as event
Barrier eliminates the reliability information of suggestion and is supplied to Digit Control Machine Tool user or maintenance personal, so as to the Failure elimination for Digit Control Machine Tool is carried
For more enriching, having more targetedly configured information, it is more conducive to accurately, timely exclude fault of numerical control machine tool.
In general, fault of numerical control machine tool cancellation scheme of the present invention based on fault tree differentiates indicating means, can pass through
Computer software runs, and can carry out remote technology support by using software, instead of " flow of personnel " with " data flowing ",
The number of times of going on business of product repairing personnel is reduced, after-sale technical support expense is reduced, contributes to strengthening Digit Control Machine Tool product
The market competitiveness, and Digit Control Machine Tool user or field service personnel can be helped in time to find failure cause, auxiliary exclusion
Failure, effectively shortens the equipment downtime caused because of equipment fault, so as to reduce for Digit Control Machine Tool user as far as possible
Breakdown loss.
More specific detail is carried out to the present invention below by embodiment.
Embodiment：
By taking phenomenon of the failure description " breaking down during knife rest tool changing " as an example, more specific description is the present invention be based on the present embodiment
The fault of numerical control machine tool cancellation scheme of fault tree differentiates indicating means during actual fault of numerical control machine tool differentiates and indicates
Using.
Before implementing fault of numerical control machine tool and differentiating and indicate, need to pre-build the fault tree information knowledge of Digit Control Machine Tool
Storehouse, index parameter standard database and Failure elimination scheme database, for example front institute of data content that three each records and stores
State, repeat no more here；Then, perform the differentiation to fault of numerical control machine tool cancellation scheme as follows to indicate：
A) provide phenomenon of the failure and describe typing operation and Digit Control Machine Tool running state parameter input operation, by the failure of typing
Phenomenon describes text-string as the target string of Fault Identification, and every Digit Control Machine Tool running state parameter of input is made
For the current operating conditions parameter of Digit Control Machine Tool.
In the present embodiment, the phenomenon of the failure of the step institute typing describes text-string " to occur event during knife rest tool changing
Barrier ", using it as target string；Meanwhile, Digit Control Machine Tool fortune is provided in the form of data transmission cable directly transmits input
The input operation of row state parameter.
B each malfunction descriptor stored in) transferring fault tree information knowledge base, is carried out with target string respectively
Contrast matching, obtain each malfunction descriptor matched with target string so as to extract, and determine match it is each
Corresponding event of failure node in each comfortable fault tree of individual malfunction descriptor, as target faults event node.
The idiographic flow of the step is as shown in Figure 2：
B1) order counts symbol i=1, makes alternative keywords vectorTarget string is assigned to into character string vector tg,
And each malfunction descriptor stored in transferring fault tree information knowledge base is assigned to basicvocabulary vector t0So that failure
Each malfunction descriptor in tree information knowledge storehouse is used as basicvocabulary vector t0In an element；
B2) take basicvocabulary vector t0In i-th element t0(i) and current character string vector tgCarry out contrast matching；If
Element t0I () is included in current character string vector tgIn, then execution step b3)；Otherwise, direct execution step b4)；
B3) by element t0I malfunction descriptor that () represents is added to alternative keywords vector tsIn, and from current
Character string vector tgMiddle rejecting element t0I the malfunction descriptor represented by (), forms new character string vector tg, then hold
Row step b4)；
B4) judge current character string vector tgWhether the number of characters guaranteed replacement has been less than presetting number of characters lower threshold
k；If so, then direct execution step b7)；Otherwise, execution step b5)；
B5) judge whether the value of current count symbol i has reached basicvocabulary vector t0Included in number of elements the upper limit
Value；If so, then direct execution step b7)；Otherwise, execution step b6)；
B6) order counts the value of symbol i from Jia 1, is then back to step b2)；
B7) calculate current alternative keywords vector tsWith the resolution K of target stringt：
Kt=Ks/Ktg；
Wherein, KsRepresent current alternative keywords vector tsWith the number of identical characters in target string, KtgRepresent
Character number in target string；Then judge the resolution KtValue whether be more than presetting resolution threshold k0；If
It is, then execution step b9)；Otherwise, execution step b8)；Here, resolution threshold k0Can value be preferably 0.5～0.6；
B8) according to presetting order regulation rule adjustment basicvocabulary vector t0Putting in order for middle element, makes and counting
Symbol i=1, makes alternative keywords vectorAgain target string is assigned to into character string vector tg, it is then back to perform
Step b2)；Here, regulation rule of the presetting order regulation rule using random reversed order, it is of course also possible to use
Other presetting order regulation rules；
B9) by current alternative keywords vector tsIn each malfunction descriptor be judged to and target string phase
The malfunction descriptor of matching, it is determined that failure corresponding in each comfortable fault tree of each malfunction descriptor for matching
Event node, as target faults event node.
In the present embodiment, presetting resolution threshold k0For 0.6；Perform to step b7) when, from target string
" knife rest ", " tool changing ", " failure " are respectively with each malfunction descriptor for extracting, comprising 6 characters, and original mesh
Mark character string " breaking down during knife rest tool changing " is comprising 9 characters, therefore is calculated resolution Kt=0.667, more than default
Fixed resolution threshold k0, therefore jump to step b9), searched according to malfunction descriptor " knife rest ", " tool changing ", " failure "
To in fault tree, corresponding event of failure node includes " knife rest turns not in place ", " tool changing warning ", " encoder fault " " locking biography
Sensor is signaled in advance ", " A.C. contactor not adhesive ".
C) according to the failure between the fault tree recorded in fault tree information knowledge base and its variant event of failure node
Logic causality, finds out all bottom event nodes corresponding to each target faults event node of determination, is judged to potential
Failure bottom event node.
In the present embodiment, according to the fault tree recorded in fault tree information knowledge base and its variant event of failure node
Between fault logic causality, find event of failure node " knife rest turn not in place ", " tool changing warnings ", " encoder is former
The each corresponding bottom event node of barrier " " lock sensor is signaled in advance ", " A.C. contactor not adhesive " includes " encoder
It is bad ", " lock sensor is bad ", " system problem ", " motor braking is bad ", " encoder loosening ", " lock sensor distance adjustment
Cross near ", " A.C. contactor is bad ", " A.C. contactor line break ", " the relay problem that control knife rest is rotated forward ", by these bottom events
Node is judged to incipient fault bottom event node.
D each corresponding every malfunction monitoring of incipient fault bottom event node is found from index parameter standard database)
Index parameter, as incipient fault monitoring index parameter, and reads each incipient fault prison from index parameter standard database
The normal envelope value of index parameter is surveyed, is contrasted with every current operating conditions parameter of the Digit Control Machine Tool of input, will
Corresponding to the value of current operating conditions parameter each incipient fault monitoring index parameter item not within normal envelope value
Each incipient fault bottom event node be judged to confirm failure bottom event node.
In the present embodiment, according to each incipient fault bottom event node it is corresponding it is every malfunction monitoring index parameter with
After every current operating conditions parameter of the Digit Control Machine Tool of input is contrasted, normal operating condition parameter is eliminated corresponding each
Incipient fault bottom event node, obtaining the corresponding incipient fault bottom event node of abnormal running state parameter includes " encoder
It is bad " and " encoder loosening ", the rwo is judged as failure bottom event node is confirmed.
E) the fault category each affiliated according to each confirmation failure bottom event node, from Failure elimination scheme database
The Failure elimination scheme text of each corresponding failure classification is transferred respectively, to the finger for carrying out fault of numerical control machine tool cancellation scheme
Show.
In the present embodiment, by searching Failure elimination scheme database, obtain " encoder is bad " and " encoder loosening "
Each self-corresponding Failure elimination scheme text is indicated, and also utilizes D-S evidence theory to two failure bottom event nodes
Probability analysis is carried out, confirms that the probable value of " encoder is bad " this failure cause is about 80%, " encoder loosening " failure cause
Probable value be about 20%, therefore the recommendation probable value of " encoder is bad " corresponding Failure elimination scheme text can be indicated in the lump
For 80%, the recommendation probable value of " encoder loosening " corresponding Failure elimination scheme text is 20%, in order to maintenance personal's root
Encoder is checked according to the Failure elimination scheme and recommendation probable value that indicate, the device behaviour that alternates coding then is carried out if any damaging
Making, corresponding tightening operation being carried out if only encoder loosens, so as to auxiliary maintaining, personnel fix a breakdown as soon as possible.
In sum, it can be seen that the fault of numerical control machine tool cancellation scheme based on fault tree of the present invention differentiates instruction side
Method, which carries out splitting contrast and circulation matching to extract target by the target string to describe phenomenon of the failure to typing
Malfunction descriptor, so as to the corresponding potential target event of failure section of target faults state description word is searched from fault tree
Point, improves and extracts malfunction descriptor and confirm the accuracy of each target faults event node and comprehensive, and using confirming
The all bottom event nodes corresponding to each target faults event node for obtaining are judged to incipient fault bottom event node, used as rear
The continuous identification basis to fault category, eliminates the interference that uncorrelated event of failure node is recognized to fault category, improves
Efficiency to fault category identification, while in turn ensure that to the comprehensive of fault category possibility identification, then further according to each
The corresponding every malfunction monitoring index parameter of incipient fault bottom event node and the current operation shape of the items of the Digit Control Machine Tool of input
State parameter is contrasted, and eliminates related incipient fault bottom event section of the running state parameter within normal envelope value
Point, obtains the incipient fault bottom event node corresponding to abnormal running state parameter and is judged to confirm failure bottom event node,
From the Failure elimination scheme that confirmation failure bottom event node corresponding failure classification is extracted according to the corresponding relation on fault category
Text improves the efficiency to fault category identification to indicate, while in turn ensure that to the complete of fault category possibility identification
The accuracy of face property and confirmation fault category, can be to be that Digit Control Machine Tool user or maintenance personal provide Failure elimination suggestion
Auxiliary, so as to help to be lifted to the Digit Control Machine Tool convenience that in addition field maintenance or long-distance service are assisted.
Finally illustrate, above example is only unrestricted to illustrate technical scheme, although with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from the objective and scope of technical solution of the present invention, which all should be covered at this
In the middle of the right of invention.
Claims (6)
1. the fault of numerical control machine tool cancellation scheme based on fault tree differentiates indicating means, it is characterised in that pre-build numerical control machine
The fault tree information knowledge base of bed, index parameter standard database and Failure elimination scheme database；The fault tree information is known
Be stored with knowing storehouse the fault tree of Digit Control Machine Tool, and the fault tree is used for the system for recording each function system in Digit Control Machine Tool
The event of failure node and different faults event of various different faults classifications in level, subsystem irrespective of size, module level and parts level
Fault logic causality between node, and the failure of the corresponding failure event that is stored with for each event of failure node correspondence
State description word, and foundation has the fault logic causality between variant event of failure node；The index parameter standard
Various lathe running state parameters in the faulty tree of data-base recording corresponding to each event of failure node refer to as malfunction monitoring
Mark parameter, and record has normal envelope value of every malfunction monitoring index parameter under Digit Control Machine Tool normal operating condition；
The Failure elimination scheme database is stored with each corresponding Failure elimination scheme text of the variant fault category of Digit Control Machine Tool
This, each Failure elimination scheme text is to state the Failure elimination scheme of its corresponding failure classification；
Then, perform the differentiation to fault of numerical control machine tool cancellation scheme as follows to indicate：
A) provide phenomenon of the failure and describe typing operation and Digit Control Machine Tool running state parameter input operation, by the phenomenon of the failure of typing
Target string of the description text-string as Fault Identification, using every Digit Control Machine Tool running state parameter of input as number
The current operating conditions parameter of control lathe；
B each malfunction descriptor stored in) transferring fault tree information knowledge base, is contrasted with target string respectively
Matching, obtains each malfunction descriptor matched with target string so as to extract, and determines each event for matching
Corresponding event of failure node in each comfortable fault tree of barrier state description word, as target faults event node；
C) according to the fault logic between the fault tree recorded in fault tree information knowledge base and its variant event of failure node
Causality, finds out all bottom event nodes corresponding to each target faults event node of determination, is judged to incipient fault
Bottom event node；
D the corresponding every malfunction monitoring index of each incipient fault bottom event node is found from index parameter standard database)
Parameter, as incipient fault monitoring index parameter, and refers to from each incipient fault monitoring of index parameter standard database reading
The normal envelope value of mark parameter, is contrasted with every current operating conditions parameter of the Digit Control Machine Tool of input, will be current
It is each corresponding to the value of running state parameter each incipient fault monitoring index parameter item not within normal envelope value
Individual incipient fault bottom event node is judged to confirm failure bottom event node；
E) the fault category each affiliated according to each confirmation failure bottom event node, from Failure elimination scheme database respectively
The Failure elimination scheme text of each corresponding failure classification is transferred, to the instruction for carrying out fault of numerical control machine tool cancellation scheme.
2. fault of numerical control machine tool cancellation scheme according to claim 1 based on fault tree differentiates indicating means, and its feature exists
In step B) it is specially：
B1) order counts symbol i=1, makes alternative keywords vectorTarget string is assigned to into character string vector tg, and adjust
Each malfunction descriptor stored in taking fault tree information knowledge base is assigned to basicvocabulary vector t0So that fault tree is believed
Each malfunction descriptor in breath knowledge base is used as basicvocabulary vector t0In an element；
B2) take basicvocabulary vector t0In i-th element t0(i) and current character string vector tgCarry out contrast matching；If element
t0I () is included in current character string vector tgIn, then execution step b3)；Otherwise, direct execution step b4)；
B3) by element t0I malfunction descriptor that () represents is added to alternative keywords vector tsIn, and from current character
String vector tgMiddle rejecting element t0I the malfunction descriptor represented by (), forms new character string vector tg, then perform step
Rapid b4)；
B4) judge current character string vector tgWhether the number of characters guaranteed replacement has been less than presetting number of characters lower threshold k；If
It is, then direct execution step b7)；Otherwise, execution step b5)；
B5) judge whether the value of current count symbol i has reached basicvocabulary vector t0Included in number of elements higher limit；If
It is, then direct execution step b7)；Otherwise, execution step b6)；
B6) order counts the value of symbol i from Jia 1, is then back to step b2)；
B7) calculate current alternative keywords vector tsWith the resolution K of target stringt：
Kt=Ks/Ktg；
Wherein, KsRepresent current alternative keywords vector tsWith the number of identical characters in target string, KtgRepresent target word
Character number in symbol string；Then judge the resolution KtValue whether be more than presetting resolution threshold k0；If so, then
Execution step b9)；Otherwise, execution step b8)；
B8) according to presetting order regulation rule adjustment basicvocabulary vector t0Putting in order for middle element, makes and counts symbol i=
1, make alternative keywords vectorAgain target string is assigned to into character string vector tg, it is then back to execution step
b2)；
B9) by current alternative keywords vector tsIn each malfunction descriptor be judged to match with target string
Malfunction descriptor, it is determined that event of failure corresponding in each comfortable fault tree of each malfunction descriptor for matching
Node, as target faults event node.
3. fault of numerical control machine tool cancellation scheme according to claim 2 based on fault tree differentiates indicating means, and its feature exists
In step b7) in, resolution threshold k0Value be 0.5～0.6.
4. fault of numerical control machine tool cancellation scheme according to claim 2 based on fault tree differentiates indicating means, and its feature exists
In step b8) in, presetting order regulation rule adopts the regulation rule of random reversed order.
5. fault of numerical control machine tool cancellation scheme according to claim 1 based on fault tree differentiates indicating means, and its feature exists
In step D) it is specially：
D1) incipient fault bottom event matrix T is given by each incipient fault bottom event node valuation so that each incipient fault bottom thing
Part node is used as an element in the incipient fault bottom event matrix T；
D2 the corresponding every malfunction monitoring index of each incipient fault bottom event node is found from index parameter standard database)
Parameter, as incipient fault monitoring index parameter；
D3 the normal envelope value of each incipient fault monitoring index parameter) is read from index parameter standard database, with input
Every current operating conditions parameter of Digit Control Machine Tool contrasted, by the value of current operating conditions parameter not in normal condition model
Enclose each incipient fault monitoring index parameter combination within value and constitute and confirm malfunction monitoring index parameter set；
D4) the record according to index parameter standard database, confirms each corresponding event of each incipient fault bottom event node
Barrier monitoring index parameter, and travels through all elements in incipient fault bottom event matrix T, by failure-description matrix T not with confirmation
In malfunction monitoring index parameter set, each corresponding element of any incipient fault monitoring index parameter is rejected, so as to obtain really
Recognize failure bottom event matrix T'；
D5) will confirm that each incipient fault bottom event node in failure bottom event matrix T' is judged to confirm failure bottom event section
Point.
6. fault of numerical control machine tool cancellation scheme according to claim 1 based on fault tree differentiates indicating means, and its feature exists
In step E) in, always according to value not within normal envelope value each of current operating conditions parameter it is potential therefore
Barrier monitoring index parameter, carries out probability analysis to each confirmation failure bottom event node using D-S evidence theory, obtains each confirmation
The probable value of failure bottom event node；When the instruction of fault of numerical control machine tool cancellation scheme is carried out, to Failure elimination scheme text
Recommendation probable value of the corresponding probable value for confirming failure bottom event node of affiliated fault category as Failure elimination scheme text
Indicated in the lump, or according to confirm failure bottom event node probable value sequence to indicate corresponding failure classification
Failure elimination scheme text be ranked up.
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