CN110163284A - Wind-driven generator group wheel box planetary transmission system FMECA analysis method - Google Patents
Wind-driven generator group wheel box planetary transmission system FMECA analysis method Download PDFInfo
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Abstract
The invention discloses a kind of wind-driven generator group wheel box planetary transmission system FMECA analysis methods, comprising the following steps: S1, carries out Failure Mode Effective Analysis to wind-driven generator group wheel box planetary transmission system, obtains failure reason analysis result；S2, the fault tree for establishing wind-driven generator group wheel box planetary transmission system；S3, the case where carrying out FMECA analysis, considering the superposition of multiple faults mode calculates incidence and detection degree；S4, minimal cut set analysis is carried out on the basis of wind-driven generator group wheel box planetary transmission system fault tree, introduce weight coefficient, assess risk priority number, calculate weight risk priority number, establish the new priority of thrashing.The present invention is using wind-driven generator group wheel box planetary transmission system as research object, its multiple faults mode is characterized with Minimizing Cut Sets of Fault Trees, in conjunction with the method for weighting and risk priority number method, qualitative analysis and quantitative analysis are carried out to it, weight risk priority number is calculated, obtaining it influences most important fault mode.
Description
Technical field
The invention belongs to fail-safe analysis field, in particular to a kind of wind-driven generator group wheel box planetary transmission system event
Barrier mode, influence and HAZAN (FMECA) method.
Background technique
21st century, with wind power generation field fast development, wind energy is using widest clean energy resource, with right
New energy continually develops utilization, and wind-power electricity generation has been increasingly becoming the effective hand for solving current energy shortages and environmental pollution
Section, becomes most fast one of the energy of current growth rate.Nowadays, wind power generating set is just towards high efficiency, low cost and large size
The direction of change is developed, and the reliability and safety to wind power generating set are it is also proposed that increasingly higher demands.
Gear-box is the important component of large-scale wind driven generator, and longtime running is in sand and dust, open air, humidity, speed change, vibration
In the complicated severe work condition environment such as dynamic, start and stop, braking, these severe work condition environments frequently can lead to gearbox planetary transmission
High vibration occurs for system, and the failures such as spot corrosion, abrasion, burn into fracture, gluing occur.
Crucial easily worn part of the planetary transmission system as gear-box, is mainly made of 3 planetary gears and 1 sun gear,
Keep strength of gear uneven in case of rigging error etc., will seriously affect the normal work of gear-box, influence wind-driven generator
The service life of group, therefore ensure that its reliability can extend the service life of wind-driven generator and reduce maintenance cost.Fault mode
It influences and HAZAN (FMECA) all issuable fault modes of each product and its is made to system in analysis system
At it is all it is possible influence, and a kind of analysis side classified by the severity of each fault mode and its probability of happening
Method, therefore its reliability can be improved in the FMECA for carrying out gearbox planetary transmission system.
Traditional failure mode analysis (FMA) only considers that single failure influences the extent of injury of system, to large-scale complicated system,
Since the influence of the method assessment multiple faults mode based on minimal cut set there are multiple component faults, can be used.Comprehensively consider more
The influence of fault mode considers that the result that influence of the single fault mode to system obtains is more acurrate rationally than traditional.To row
Star transmission system carries out failure tree analysis (FTA) (FTA), then available minimal cut set is endangered on the basis of minimal cut set
Property analysis.For not repairable system as planetary transmission system, HAZAN is being carried out with risk priority number method (RPN)
When, severity (S), incidence (O), in detection degree (D) these three factors, incidence (O) is obviously more important than detection degree (D), therefore
Cannot ignore these three factors weight it is unequal the fact that, therefore can be by introducing weight risk factor for RPN and power
Multiplication is weighed to extend RPN.Weight risk factor is used to characterize the importance of system internal fault reason, considers weight risk system
Number is more reasonable for the risk ranking of the system failure.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of methods of combination multiple faults superposition, carry out
Qualitative analysis and quantitative calculating combine a kind of weight risk priority evaluation method to wind-driven generator group wheel box planetary drivetrain
System fault mode is resequenced, and obtains more accurate wind-driven generator group wheel box planetary drivetrain after multiple faults superposition
System risk priority number.
The purpose of the present invention is achieved through the following technical solutions: wind-driven generator group wheel box planetary transmission system
FMECA analysis method, comprising the following steps:
S1, failure mode and effect analysis: using wind-driven generator group wheel box planetary transmission system as research object, to wind
Power generator group gearbox planetary transmission system carries out Failure Mode Effective Analysis (FMEA), each components institute in analysis system
It is possible that the fault mode occurred, obtains failure reason analysis result；
S2, the wind-driven generator group wheel box planetary transmission system failure mode and effect analysis according to obtained in step S1
Model establishes the fault tree of wind-driven generator group wheel box planetary transmission system；
S3, the case where carrying out FMECA analysis, considering the superposition of multiple faults mode calculates incidence and detection degree；
S4, minimal cut set analysis is carried out on the basis of wind-driven generator group wheel box planetary transmission system fault tree, introduce
Weight coefficient assesses RPN, calculates WRPN, establishes the new priority of thrashing.
Further, the step S3 includes following sub-step:
S31, when wind-driven generator group wheel box planetary transmission system multiple faults superposition when, for incidence O, detection degree D
Respectively between with or relationship, multiplication is respectively adopted, Adding law is calculated.
The superimposed incidence of S32, multiple faults, detection angle value, related overflow is solved using the method for linearly interval mapping
Out the problem of.
Further, the step S4 includes following sub-step:
S41, the method for synthesizing a failure for the multiple failures of wind-driven generator group wheel box planetary transmission system, application
Minimal cut set carries out failure composite calulation, using descending method seeks its minimal cut set；
S42, pass through WiTo describe the importance of minimal cut set, f (Wi) it is used as OiWeight, f (Wi) operation be Wi
With the mapping process between its ranking:
WRPNi=RPNi×f(Wi)=Si×Oi×Di×f(Wi) i≠0
In formula, WiFor the importance of i-th of minimal cut set in system, f (Wi) it is independent variable WiFunction；
Using the derivative calculations W of System structural functioni:
In formula, g (p) is System structural function, piIt is the probability that i-th of minimal cut set occurs；
Wherein,
Minimal cut set is equivalent to input for mutually indepedent failure cause probability and door, that is, is multiplied:
pi=pk1×pk1×…×pkm m≠0
In formula, pki, i=1 ..., m is the probability of failure cause in i-th of minimal cut set；
Obtain WiCalculation formula are as follows:
WRPN is calculated with following formula:
The beneficial effects of the present invention are: the present invention is based on weight risk priority number methods, to wind-driven generator group wheel box row
Star transmission system carries out FMECA analysis.Fault mode, the failure of wind-driven generator group wheel box planetary transmission system are analyzed first
Reason carries out Large-scale Wind Turbines gearbox planetary transmission system FMEA analysis；Establish wind-driven generator group wheel box row
The FTA analysis method of star transmission system, solves the minimal cut set of fault tree；And then the method for combining multiple faults superposition, determined
Property analysis and it is quantitative calculate, combine a kind of weight risk priority evaluation method to wind-driven generator group wheel box planetary transmission system
Fault mode is resequenced, and obtains more accurate risk priority number after multiple faults superposition.
Detailed description of the invention
Fig. 1 is wind-driven generator group wheel box planetary transmission system FMECA analysis method flow chart of the invention；
Fig. 2 is the fault tree of wind-driven generator group wheel box planetary transmission system of the present invention.
Specific embodiment
Technical solution of the present invention is further illustrated with reference to the accompanying drawing.
As shown in Figure 1, wind-driven generator group wheel box planetary transmission system FMECA analysis method, comprising the following steps:
S1, failure mode and effect analysis: using wind-driven generator group wheel box planetary transmission system as research object, from it
System structural analysis, working environment and fault data statistics set out, to wind-driven generator group wheel box planetary transmission system into
Row Failure Mode Effective Analysis (FMEA), all fault modes being likely to occur of each components in analysis system, obtains failure
Analysis of causes result；
From the structure of wind-driven generator group wheel box planetary transmission system, operating condition, data statistics and environmental analysis, it is
All fault modes of system, as shown in table 1.
1 wind-driven generator group wheel box planetary transmission system FMEA table of table
Planetary transmission system is mainly made of gear ring, input shaft, planetary gear train, sun gear, and planetary gear train includes planet again
Wheel, bearing, axis.The fault mode table of planetary transmission system is obtained by analyzing its structure function, analysis data, operating condition etc..
S2, the wind-driven generator group wheel box planetary transmission system Failure Mode Effective Analysis knot according to obtained in step S1
Fruit establishes the fault tree of wind-driven generator group wheel box planetary transmission system, as shown in Figure 2；
S3, FMECA analysis is carried out, in HAZAN calculation risk priority number, considers the feelings of multiple faults mode superposition
Condition calculates incidence and detection degree, and takes the method for linearly interval mapping to solve to combine relevant overflow problem.Specifically
Including following sub-step:
S31, when wind-driven generator group wheel box planetary transmission system multiple faults superposition when, for incidence (O), detection degree
(D) respectively between with or relationship, multiplication is respectively adopted, Adding law is calculated.
Incidence (O) refers to that failure cause or mechanism expect a possibility that occurring；Detection degree (D) is to existing control, mistake
Degree known to effect mode and failure cause；Indicate that only outgoing event just occurs when all events all occur with door；Or door
Indicate that outgoing event occurs when at least one incoming event occurs.
When multiple faults is superimposed to incidence (O), detection degree (D) be respectively adopted with or calculate, by multiple and door failure
When merging into a failure, it is multiplied using multiple probabilities of malfunction.
AND:
OR:
Oi、DiThe incidence and detection degree of i-th of failure are respectively indicated, m indicates the total quantity of failure；Traditional FMECA into
When row risk priority number calculates, suggest standards of grading using following:
2 risk priority coefficient standards of grading of table
In table, S, O, D are three indexs of calculation risk priority number, and S is severity；O is incidence；D is detection degree,
Ppm is hundred a ten thousandths.
The superimposed incidence of S32, multiple faults, detection angle value, related overflow is solved using the method for linearly interval mapping
Out the problem of.
Mathematically when two failures of calculating are with door operation, when [0,10] this range is overflowed in the multiplication of two ranks
When, the mode of Linear Mapping is taken, such as [0,100] → [0,10], then searches corresponding value in risk priority number grade form.
S4, minimal cut set analysis is carried out on the basis of wind-driven generator group wheel box planetary transmission system fault tree, introduce
Weight coefficient reappraises RPN, calculates WRPN, establishes the new priority of thrashing；Including following sub-step:
S41, the method for synthesizing a failure for the multiple failures of wind-driven generator group wheel box planetary transmission system, application
Minimal cut set carries out failure composite calulation, seeks its minimal cut set using descending method, in the fault tree obtained by S2, using descending method
Cut set is acquired, obtains minimal cut set in conjunction with set operation absorption law are as follows: { x1},{x2},{x3},{x4},{x5,x3},{x7,x8}。
S42, for not repairable system, three factors (S, O, D) have different different degrees in system design, in general
O is key factor, and O is more important than other assemblies in some components, and the probability contribution that top event occurs is bigger.Pass through WiTo retouch
The importance for stating minimal cut set, using f (Wi) it is used as OiWeight, f (Wi) operation be WiReflecting between grade ranking
Penetrate process:
WRPNi=RPNi × f (Wi)=Si×Oi×Di×f(Wi) i≠0
In formula, WiFor the importance of i-th of minimal cut set in system, f (Wi) it is independent variable WiFunction；
Using the derivative calculations W of System structural functioni:
In formula, g (p) is System structural function, piIt is the probability that i-th of minimal cut set occurs；
Assuming that the effectual reason of institute is all independent from each other, then all minimal cut sets are just independent from each other, then:
Minimal cut set is equivalent to input for mutually indepedent failure cause probability and door, that is, is multiplied:
pi=pk1×pk1×…×pkm m≠0
In formula, pki, i=1 ..., m is the probability of failure cause in i-th of minimal cut set；
Obtain WiCalculation formula are as follows:
piValue be often below 0.01, therefore WiValue closer to 1, for not repairable system, WiWill not largely it change
The sequence of accident barrier, but also play an important role.
Weight risk priority number (WRPN) is calculated with following formula:
Wherein, RPNiFor the weight risk priority number of i-th of influence factor.By calculating new RPNiTo the system failure into
Row rearrangement, numerical value is bigger, and system failure risk is bigger.
Therefore, factor S, O, D are according to degree from 1 (best) to 10 (worst).In order to make probability weight coefficient WiAt three
It is consistent between the factor, has formulated a reasonable New standard according to table 2, as shown in table 3.
3 weight coefficient W of tableiStandard
f(Wi) value and WiValue corresponded in upper table, WiDomain is [0,1], f (Wi) be 1,2,3 ...,
10 }, according to the score value W of i-th of cut setiThe grade sequence value f (W of the available cut seti)。
Minimal cut set { the x obtained by S411},{x2},{x3},{x4},{x5,x3},{x7,x8, the corresponding risk priority of failure
The value of three several influence factors is as shown in table 4.
Evaluation of estimate of 4 three factors of table to system
The case where calculating failure superposition in minimal cut set according to S31, obtains 5 result of table.
5 multiple faults of table is superimposed new FMEA
It is calculated according to table 2, table 3, table 4:
Therefore, new FMECA is obtained based on WRPN, is to consider multiple faults superposition and consideration weight system on traditional FMECA
Number obtains more accurate FMECA analysis, as shown in table 6.
6 FMECA of table analyzes final result
As can be seen from Table 6, the failure of system has new priority, since the system is not repairable system, factor O
More important than D, WRPN considers the case where various faults are superimposed and by indicating failure cause or component multiplied by a weight coefficient
Importance, directly calculated compared to RPN it is more acurrate rationally.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill disclosed the technical disclosures can make according to the present invention and various not depart from the other each of essence of the invention
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (3)
1. wind-driven generator group wheel box planetary transmission system FMECA analysis method, which comprises the following steps:
S1, failure mode and effect analysis: using wind-driven generator group wheel box planetary transmission system as research object, wind-force is sent out
Motor group gearbox planetary transmission system carries out Failure Mode Effective Analysis (FMEA), and each components are all in analysis system can
The fault mode that can occur, obtains failure reason analysis result；
S2, the wind-driven generator group wheel box planetary transmission system failure mode and effect analysis knot according to obtained in step S1
Fruit establishes the fault tree of wind-driven generator group wheel box planetary transmission system；
S3, the case where carrying out FMECA analysis, considering the superposition of multiple faults mode calculates incidence and detection degree；
S4, minimal cut set analysis is carried out on the basis of wind-driven generator group wheel box planetary transmission system fault tree, introduce weight
Coefficient assesses RPN, calculates WRPN, establishes the new priority of thrashing.
2. wind-driven generator group wheel box planetary transmission system FMECA analysis method according to claim 1, feature exist
In the step S3 includes following sub-step:
S31, when wind-driven generator group wheel box planetary transmission system multiple faults superposition when, respectively for incidence O, detection degree D
Between with or relationship, multiplication is respectively adopted, Adding law is calculated.
The superimposed incidence of S32, multiple faults, detection angle value, related spilling is solved using the method for linearly interval mapping
Problem.
3. wind-driven generator group wheel box planetary transmission system FMECA analysis method according to claim 1, feature exist
In the step S4 includes following sub-step:
S41, the method for synthesizing a failure for the multiple failures of wind-driven generator group wheel box planetary transmission system, using minimum
Cut set carries out failure composite calulation, using descending method seeks its minimal cut set；
S42, pass through WiTo describe the importance of minimal cut set, f (Wi) it is used as OiWeight, f (Wi) operation be WiWith it
Mapping process between ranking:
WRPNi=RPNi×f(Wi)=Si×Oi×Di×f(Wi) i≠0
In formula, WiFor the importance of i-th of minimal cut set in system, f (Wi) it is independent variable WiFunction；
W is calculated using the derivative of System structural functioni:
In formula, g (p) is System structural function, piIt is the probability that i-th of minimal cut set occurs；
Wherein,
Minimal cut set is equivalent to input for mutually indepedent failure cause probability and door, that is, is multiplied:
pi=pk1×pk1×…×pkmIn the formula of m ≠ 0, pki, i=1 ..., m is the probability of failure cause in i-th of minimal cut set；
Obtain WiCalculation formula are as follows:
WRPN is calculated with following formula:
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