CN108874741A - A kind of relay valve leakage failure detection method based on SPRT algorithm - Google Patents
A kind of relay valve leakage failure detection method based on SPRT algorithm Download PDFInfo
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Abstract
The relay valve leakage failure detection method based on SPRT algorithm that the present invention relates to a kind of, according to relay valve input-output characteristic, it is normally had differences with the output pressure data amplitude under leakage situation for relay valve, leak detection is carried out using SPRT algorithm, to achieve the effect that the detection of relay valve leakage failure and early warning.Relay valve occur leakage failure but when do not influence train operation can real-time detection come out, so that maintenance personnel is predicted relay valve health status in advance, improve the availability of braking system, guarantee driving safety.Meanwhile instruction also is provided for maintenance, reduce maintenance cost.
Description
Technical field
The present invention relates to a kind of leakage failure detection techniques, and in particular to a kind of for detecting the inspection of relay valve leakage failure
Survey method.
Background technique
Critical component of the relay valve as EMU braking control system, can be due to supplying valve group during long-term operation
The reasons such as part vulcanization circle sealing part abrasion leak, and cause relaying valve performance decline, and then influence the state of braking system.Mesh
Before, the fault detection for relay valve is functional detection, due to the control characteristic of relay valve, minor leakage even moderate
Leakage is most of not to influence the realization of its function, until relay valve occurs severe and leaks and could be detected after influencing braking system performance
It surveys.
Summary of the invention
The technical problem to be solved by the present invention is to be difficult to the defect detected for relay valve leakage, provide one kind and be based on
The relay valve leakage failure detection method of SPRT algorithm is leaked according to relay valve input-output characteristic using SPRT algorithm
Detection, to achieve the effect that the detection of relay valve leakage failure and early warning.
In order to solve the above technical problems, the relay valve leakage failure detection side provided by the invention based on SPRT algorithm
Method includes the following steps：
Step 1, data acquisition
Obtain relay valve output pressure data, the data fit normal distribution；
Step 2 calculates inspection parameter
Checking parameter is calculated according to the following formula
In formula, μ0For the mean value of normal sample, σ is the standard deviation of normal sample, and Δ μ is mean bias threshold value, and m is test
Number of samples, xiFor i-th of relay valve output pressure data in test sample；
Step 3, leakage judgement
The coboundary of checking parameter and lower boundary are respectively
Wherein, α and β respectively indicates the false alarm rate of permission and the mistake alarm rate of permission；
If λ (m), which is greater than upper limit A, judges that relay valve has leakage, judge that relay valve does not leak hair less than lower limit B
It is raw, then continue to judge between A and B.
The method of the present invention according to relay valve input-output characteristic, for relay valve normally with the output pressure under leakage situation
Data amplitude has differences, and carries out leak detection using SPRT algorithm, to reach the detection of relay valve leakage failure and early warning
Effect.Relay valve occur leakage failure but when do not influence train operation can real-time detection come out, mention maintenance personnel
Preceding precognition relay valve health status, improves the availability of braking system, guarantee driving safety.Meanwhile finger also is provided for maintenance
Opinion is led, maintenance cost is reduced.
Detailed description of the invention
The present invention will be further described below with reference to the drawings.
Fig. 1 is the relay valve leakage failure detection method flow chart based on SPRT algorithm.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.
The present invention is based on the relay valve leakage failure detection method principle of SPRT algorithm is as follows：
Relay valve output pressure data, should meet that mean value is μ and variance is σ2Normal distribution.
It is assumed that relay valve normal time pressure data sequence meets null hypothesis H0：μ=μ0, μ0For the mean value of normal sample；Leakage
When meet alternative hypothesis H1：μ=μ0+Δμ.Wherein Δ μ is mean bias threshold value, and mean value Δ μ > 0 indicates that pressure rises, i.e., interior to let out
Leakage；Δ μ < 0 indicates pressure decline, i.e. external leakage.Assume that α and β respectively indicate the false alarm rate of permission and the mistake report of permission simultaneously
Alert rate.
In null hypothesis H0：μ=μ0Under conditions of establishment and alternative hypothesis H1：μ=μ0Under conditions of+Δ μ is set up, stochastic ordering
The joint probability density of column is
In formula, σ is the standard deviation of normal sample, and m is test sample number, xiIt is defeated for i-th of relay valve in test sample
Pressure data out；
So-called SPRT inspection is exactly to observe ratio P1m/P0mIf this ratio meets inequality
Then receive null hypothesis H0, that is, judge normal.
If this ratio meets inequality
Then refuse null hypothesis H0, that is, judge there is leakage.
If this ratio meets inequality
The judgement for receiving or refusing null hypothesis cannot be made, it is necessary to continue to observe, until this ratio meets first two
Until situation.
It is rightIt further derives and is simplified, inspection parameter of the invention can be obtained：
It is transformed into logarithmic form：
Finally obtained inspection parameter calculation formula is
Relay valve leakage failure detection method of the present embodiment based on SPRT algorithm, includes the following steps：
Step 1, data acquisition
Obtain relay valve output pressure data, the data fit normal distribution；
Step 2 calculates inspection parameter
Checking parameter is calculated according to the following formula
In formula, μ0For the mean value of normal sample, σ is the standard deviation of normal sample, and Δ μ is mean bias threshold value, and m is test
Number of samples, xiFor i-th of relay valve output pressure data in test；
Step 3, leakage judgement
The coboundary of checking parameter and lower boundary are respectively
Wherein, α and β respectively indicates the false alarm rate of permission and loses alarm rate；
If λ (m), which is greater than upper limit A, judges that relay valve has leakage, judge that relay valve does not leak hair less than lower limit B
It is raw, then continue to judge between A and B；
Step 4, if it is determined that relay valve have leakage occur then carry out warning note, if it is determined that relay valve does not leak hair
Life can not judge whether to leak, then go to step 2 and recalculate inspection parameter.
In the present embodiment, the value range of mean bias threshold value Δ μ is：0.1-0.2, value 0.15 in this example.Allow
False alarm rate α value range is：0.01-0.05, value is 0.01 in this example.The mistake alarm rate β value range of permission is：
0.01-0.05, value is 0.01 in this example.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (5)
1. a kind of relay valve leakage failure detection method based on SPRT algorithm, includes the following steps：
Step 1, data acquisition
Obtain relay valve output pressure data, the data fit normal distribution；
Step 2 calculates inspection parameter
Checking parameter is calculated according to the following formula
In formula, μ0For the mean value of normal sample, σ is the standard deviation of normal sample, and Δ μ is mean bias threshold value, and m is test sample
Number, xiFor i-th of relay valve output pressure data in test；
Step 3, leakage judgement
The coboundary of checking parameter and lower boundary are respectively
Wherein, α and β respectively indicates the false alarm rate of permission and loses alarm rate；
If λ (m), which is greater than upper limit A, judges that relay valve has leakage, judge that relay valve does not leak generation less than lower limit B,
Then continue to judge between A and B.
2. the relay valve leakage failure detection method according to claim 1 based on SPRT algorithm, it is characterised in that：If
Judge that relay valve has leakage to occur then to carry out warning note, if it is determined that relay valve does not leak generation or can not judge whether to let out
Leakage, then go to step 2 and recalculate inspection parameter.
3. the relay valve leakage failure detection method according to claim 1 based on SPRT algorithm, it is characterised in that：Mean value
The value range of deviation threshold Δ μ is：0.1-0.2.
4. the relay valve leakage failure detection method according to claim 2 based on SPRT algorithm, it is characterised in that：Allow
False alarm rate α value range be：0.01-0.05.
5. the relay valve leakage failure detection method according to claim 2 based on SPRT algorithm, it is characterised in that：Allow
Mistake alarm rate β value range be：0.01-0.05.
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| CN201810629874.1A CN108874741A (en) | 2018-06-19 | 2018-06-19 | A kind of relay valve leakage failure detection method based on SPRT algorithm |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031208A (en) * | 2019-03-14 | 2019-07-19 | 中国铁路总公司 | The method and device of relay valve fault diagnosis |
| CN110159554A (en) * | 2019-05-24 | 2019-08-23 | 武汉工程大学 | Centrifugal pump fault diagnostic method based on pivot analysis and sequential probability ratio test |
| CN110672283A (en) * | 2019-10-28 | 2020-01-10 | 中国南方电网有限责任公司超高压输电公司大理局 | Method and system for detecting and positioning water leakage of cold water pipeline in converter valve |
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| CN108050397A (en) * | 2018-01-24 | 2018-05-18 | 东北大学 | Layering based on optical fiber source signal is sequential than pipe leakage monitoring method and system |
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| US7162393B1 (en) * | 2005-09-01 | 2007-01-09 | Sun Microsystems, Inc. | Detecting degradation of components during reliability-evaluation studies |
| CN108050397A (en) * | 2018-01-24 | 2018-05-18 | 东北大学 | Layering based on optical fiber source signal is sequential than pipe leakage monitoring method and system |
Non-Patent Citations (2)
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| 徐建军等: "应用SPRT算法的管道小泄漏检测", 《电机与控制学报》 * |
| 谭民等: "故障检测与诊断的SPRT方法及其修正", 《信息与控制》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031208A (en) * | 2019-03-14 | 2019-07-19 | 中国铁路总公司 | The method and device of relay valve fault diagnosis |
| CN110159554A (en) * | 2019-05-24 | 2019-08-23 | 武汉工程大学 | Centrifugal pump fault diagnostic method based on pivot analysis and sequential probability ratio test |
| CN110672283A (en) * | 2019-10-28 | 2020-01-10 | 中国南方电网有限责任公司超高压输电公司大理局 | Method and system for detecting and positioning water leakage of cold water pipeline in converter valve |
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