CN113065196B - Method and system for evaluating fatigue life of electromagnetic valve for locomotive braking system - Google Patents
Method and system for evaluating fatigue life of electromagnetic valve for locomotive braking system Download PDFInfo
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Abstract
The application provides a solenoid valve fatigue life evaluation method and system for locomotive braking system, based on the brake position number of times of locomotive actual operation and the pressure variation of each brake position, and the pressure control rate standard of locomotive braking control system, obtain the action number of times of solenoid valve in unit time, and then combine the fatigue life index of solenoid valve, calculate the fatigue life of solenoid valve, according to the solenoid valve fatigue life who obtains, arrange the reasonable replacement plan of solenoid valve, thereby change the solenoid valve in the appropriate time, reduce because of the solenoid valve surpasss the probability that the fatigue life leads to locomotive braking trouble to take place.
Description
Technical Field
The application belongs to the technical field of vehicle braking systems, and particularly relates to a method and a system for evaluating fatigue life of an electromagnetic valve for a locomotive braking system.
Background
The locomotive brake system controls the pressure of each module of the brake system through the inflation electromagnetic valve and the exhaust electromagnetic valve, and further controls the pressure of a locomotive brake cylinder and a train pipe, so that service braking, relieving and parking braking are realized. Aiming at the inflation electromagnetic valve and the exhaust electromagnetic valve of different modules, due to the difference of action frequency, reliability degree and selected brands, the application time of the failure caused by exceeding the fatigue life in the application process can not be determined, so that in the daily maintenance of a braking system, a proper maintenance and replacement plan can not be formulated, the failure probability of the electromagnetic valve in the braking process is uncontrollable, and the normal operation of a locomotive is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a method and a system for evaluating the fatigue life of an electromagnetic valve for a locomotive braking system.
The technical scheme provided by the application is as follows:
a method for evaluating fatigue life of an electromagnetic valve for a locomotive brake system comprises the following steps:
acquiring locomotive operation information: collecting the pressure variation quantity delta P of each brake position of the brake controller in unit time T n And the number of times of operation of each gate position n ；
Acquiring the action times of the electromagnetic valve: according to the pressure control rate standard of the locomotive brake control system, the action parameters of the electromagnetic valve during pressure change are obtained through special test of a laboratory, and the pressure change quantity delta P is combined n And the number of times of operation DeltaN of each gate position n Obtaining the action times of the electromagnetic valve in unit time T through proportional operation of pressure change;
estimating the fatigue life of the electromagnetic valve: calculating the fatigue life of the electromagnetic valve according to the action times of the electromagnetic valve in the unit time T and by combining the fatigue life performance index of the electromagnetic valve;
wherein n is the {1,2,3, · · k }, and k is the total number of brake bits of the brake controller.
Preferably, the step of acquiring the number of times of actuation of the solenoid valve includes a step of acquiring the number of times of actuation of an exhaust solenoid valve and a step of acquiring the number of times of actuation of an inflation solenoid valve;
The electromagnetic valve fatigue life estimating step comprises an exhaust electromagnetic valve fatigue life estimating step and an inflation electromagnetic valve fatigue life estimating step.
Preferably, the exhaust electromagnetValve operation frequency acquiring step for acquiring the operation frequency N of the exhaust solenoid valve in unit time T by the following model d ：
Wherein, Δ P d Representing the amount of change, DeltaN, in the pressure drop d Shows the amount of change Δ P in the pressure drop d The number of times of operation of the exhaust solenoid valve.
Preferably, the exhaust solenoid valve fatigue life estimation step specifically includes: according to the action times N of the exhaust solenoid valve in the unit time T d And calculating the fatigue life of the exhaust electromagnetic valve by combining the fatigue life performance index of the exhaust electromagnetic valve.
Preferably, the step of acquiring the number of times of actuation of the inflation solenoid valve includes: an obtaining step of the number of releasing actions of the inflation solenoid valve and an obtaining step of the number of air supplementing actions of the inflation solenoid valve.
Preferably, the inflation solenoid valve relaxation operation number acquisition step acquires the number N of inflation solenoid valve relaxation operations per unit time T by the following model 1 u ：
Wherein, Δ P u Indicates the amount of change in pressure rise,. DELTA.N u Shows the amount of change Δ P in the pressure rise u The number of times of operation of the inflation solenoid valve.
Preferably, the inflation solenoid valve air supply operation frequency acquiring step acquires the inflation solenoid valve air supply operation frequency N per unit time T by using the following model 2 u ：
Wherein, P l The leakage amount of the gas is stabilized.
Preferably, the steady pressure gas leakage amount P l By means of a model
Is obtained by calculation, wherein h Indicates the amount of change, DeltaT, of the pressure leak h Shows the amount of change DeltaP of pressure leak h Time required, T h The surge time is indicated.
Preferably, the voltage stabilization time T is h Obtained by calculation as follows:
T h ＝T-T u -T d ；
wherein T is the unit time of acquisition, T d For the time of the action of air-exhausting, T u The time of the air charging action;
the air exhaust action time T d By means of a model
Calculated acquisition, Δ P d Indicates the amount of change in pressure drop,. DELTA.T d Shows the amount of change Δ P in the pressure drop d The time required;
the air charging action time passes through the model
Calculated to obtain,. DELTA.T u Shows the amount of change Δ P in the pressure rise u The time required.
Preferably, the fatigue life estimation step of the inflation solenoid valve specifically comprises the following steps: according to the number N of times of action of relieving the inflating electromagnetic valve in the unit time T 1 u And the number of times N of air supplement actions of the inflating electromagnetic valve in the unit time T 2 u Calculating the total number of times N of the actions of the inflating solenoid valve in the unit time T u ，N u ＝N 1 u +N 2 u And calculating the fatigue life of the inflation solenoid valve by combining the fatigue life performance index of the inflation solenoid valve.
The application also provides a system for realizing the method for evaluating the fatigue life of the electromagnetic valve for the locomotive braking system, which comprises the following steps:
The locomotive running information acquisition unit is used for acquiring the pressure variation quantity delta P of each brake position of the brake controller in unit time T n And the number of times of operation of each gate position is DeltaN n ；
The electromagnetic valve action frequency acquisition unit is used for acquiring the action parameters of the electromagnetic valve during pressure change through special test of a laboratory according to the pressure control rate standard of the locomotive brake control system and combining the pressure change quantity delta P n And the number of times of operation of each gate position is Delta N n Obtaining the action times of the electromagnetic valve in unit time T through proportional operation of pressure change;
the electromagnetic valve fatigue life estimation unit is used for calculating the fatigue life of the electromagnetic valve according to the action times of the electromagnetic valve in the unit time T and by combining the fatigue life performance index of the electromagnetic valve;
wherein n is the {1,2,3, · · k }, and k is the total number of brake bits of the brake controller.
Compared with the prior art, the beneficial effect of this application is:
the application provides a locomotive is solenoid valve fatigue life evaluation method for braking system, based on the brake position number of times and the pressure variation of each brake position of locomotive actual operation, and the pressure control rate standard of locomotive braking control system, obtain the action number of times of solenoid valve in unit time, and then combine the fatigue life index of solenoid valve, calculate the fatigue life of solenoid valve, according to the solenoid valve fatigue life who obtains, arrange the reasonable replacement plan of solenoid valve, thereby change the solenoid valve in suitable time, reduce because of the solenoid valve surpasss the probability that the fatigue life leads to locomotive braking trouble to take place.
Drawings
FIG. 1 is a flow chart of a method for fatigue life assessment of a solenoid valve for a locomotive brake system according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating a fatigue life evaluation system for a solenoid valve of a locomotive brake system according to an embodiment of the present application.
Numbering in the figures: 1. a locomotive operation information acquisition unit; 2. an electromagnetic valve operation frequency acquisition unit; 3. and a fatigue life estimation unit of the electromagnetic valve.
Detailed Description
The technical solutions of the present application are explained in detail below with reference to specific embodiments, however, it should be understood that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
It is appreciated that although the figures may show a specific order of method steps, the order of the steps may differ from the order depicted. Further, two or more steps may be performed simultaneously or partially simultaneously. Such variations will depend on the software and hardware chosen and on designer choice. All such variations are within the scope of the present disclosure.
It is to be understood that the terms "system," "unit," "module" or "modules" as used herein is a method for distinguishing between different components, elements, parts, portions or assemblies at different levels. However, these terms may be substituted by other expressions which achieve the same purpose.
The embodiments described above are merely preferred embodiments of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the spirit of the present application should fall within the protection scope defined by the claims of the present application.
As shown in fig. 1, an embodiment of the present application provides a method for evaluating fatigue life of an electromagnetic valve for a locomotive brake system, which specifically includes the following steps:
a step S1 of collecting the operation information of the locomotive, wherein the pressure variation quantity delta P of each brake position of the brake controller in unit time T is collected n And the number of times of operation of each gate position n N belongs to {1,2,3, · · k }, and k is the total number of brake positions of the brake controller;
an operation frequency obtaining step S2 of the solenoid valve according to the pressure control of the locomotive brake control systemThe control rate standard is that the action parameters of the electromagnetic valve when the pressure changes are obtained by the special test of a laboratory, and the pressure change quantity delta P is combined n And the number of times of operation of each gate position is Delta N n Obtaining the action times of the electromagnetic valve in unit time T through proportional operation of pressure change;
and an electromagnetic valve fatigue life estimation step S3, wherein the fatigue life of the electromagnetic valve is calculated according to the number of times of the electromagnetic valve action in the unit time T and by combining the fatigue life performance index of the electromagnetic valve.
The locomotive brake system controls the pressure change of the equalizing air cylinder, the electronic distribution valve and the single brake cylinder through independent air charging and exhausting electromagnetic valves respectively, and further realizes the pressure control of the locomotive brake cylinder and the train pipe. Taking the equalizing air cylinder as an example, when the inflation electromagnetic valve is opened and the exhaust electromagnetic valve is closed, the total air enters the equalizing air cylinder, so that the pressure of the equalizing air cylinder is increased; when the inflation electromagnetic valve is closed and the exhaust electromagnetic valve is opened, the gas in the balance air cylinder is exhausted into the atmosphere, so that the pressure of the balance air cylinder is reduced; when both the charging solenoid valve and the discharging solenoid valve are closed, the equalizing reservoir pressure is maintained.
During the operation of the locomotive, the pressure change of the equalizing air cylinder changes along with the change of the brake position of the brake controller. The brake controller has five brake positions including a primary brake position, a full brake position, a suppression position, a reconnection position and an emergency position, and 1 relief brake position of an operation position, wherein different brake positions respectively correspond to different pressure variation, and the pressure variation of the primary brake position is delta P 1 The total detent pressure variation is DeltaP 2 The amount of change in suppression bit pressure is DeltaP 3 The amount of pressure change in the reconnection position is delta P 4 The amount of change in the emergency bit pressure is DeltaP 5 The pressure variation of each gate position is fixed and unchanged. The method for evaluating the fatigue life of the electromagnetic valve for the locomotive braking system provided by the embodiment is based on the actual running data of the locomotive in the unit time T and the number of times of actions delta N of each brake position obtained by statistical analysis 1 ～△N 5 Further, the fatigue life of the solenoid valve for the brake system is obtained.
The pressure control rate of the locomotive brake control system needs to meet the requirements of TJ/JW 039-The standard requirement of locomotive microcomputer control air brake system temporary technical specification, wherein the standard specifies the boosting rate requirement parameter (delta P) of a balance air cylinder and the like u ,△T u ) That is, the pressure variation amount is Δ P during the pressure raising u The minimum standard of elapsed time is Δ T u (ii) a Decompression Rate requirement parameter (Δ P) d ,△T d ) That is, the pressure change amount is Δ P during depressurization d The minimum standard of elapsed time is Δ T d (ii) a Leakage Rate requirement parameter (Δ P) at pressure holding h ,△T h ) That is, the pressure change amount is Δ P during the pressure holding process h The minimum standard of elapsed time is Δ T h 。
The locomotive braking system runs from a brake release position to a brake position in the braking process, and the action times of the brake position are counted. The action times of the other brake position are counted by considering the multi-brake position linkage condition when emergency or punishment is relieved, namely the condition that one brake position runs to the other brake position. However, the number of movements of the brake position from the brake position to the release position is not counted. In the braking process of the system, the counting of the brake position action times takes the limit condition, namely, except for the 'operation position', other brake positions all consider the brake position change during the braking. For example, the brake level change during braking is: the operation position is moved to the full-position, then is moved from the full-position to the initial-position, and finally is returned to the operation position from the initial-position, and the result of counting the number of gate position actions is as follows: the full-braking action frequency is 1, the initial-braking action frequency is 1, and the pressure variation is as follows: full detent Δ P 2 Primary localization Δ P 1 . That is, the pressure change amount Δ P of the brake pad is considered to be completed once per one shift between the brake pads n Because the charging and discharging process needs a certain time, the actual pressure variation does not necessarily reach the pressure variation delta P of the brake position n Considering that the fatigue life of the electromagnetic valve is related to the problem of train brake failure, the counting is in a limit condition.
The solenoid valve operation number acquisition step S2 includes an exhaust solenoid valve operation number acquisition step S21;
the exhaust solenoid valve operation number acquisition step S21 is: a depressurization rate requirement parameter (Δ P) specified according to a pressure control rate standard of a locomotive brake control system d ,△T d ) The operation parameters (delta P) of the exhaust electromagnetic valve when the pressure changes are obtained by the special test of the laboratory d ,△N d )；
According to the exhaust solenoid valve operating parameter (Delta P) d ,△N d ) Pressure change amount Δ P n And the number of times of each gate operation n Obtaining the action times N of the exhaust solenoid valve in unit time T through proportional operation of pressure change d ；
The step of estimating fatigue life of the solenoid valve S3 includes a step of estimating fatigue life of the exhaust solenoid valve S31, and the step of estimating fatigue life of the exhaust solenoid valve S31 specifically includes: according to the action times N of the exhaust solenoid valve in the unit time T d The action times of the exhaust solenoid valve in one year of locomotive operation are calculated, and the fatigue life of the exhaust solenoid valve is calculated by combining the fatigue life performance index of the exhaust solenoid valve.
Taking an equalizing cylinder of a brake control system with five brake positions as an example, the brake position number k is 5, when a locomotive brake system performs braking, the equalizing cylinder needs to be depressurized, and assuming that the collected unit time T is 1 day, the sum of pressure variations of the five brake positions of the brake controller in one day is the total pressure variation of the equalizing cylinder in one day, and the equalizing cylinder is depressurized through an exhaust solenoid valve, so that the total pressure variation realized through the exhaust solenoid valve in one day is equal to Δ P 1 *ΔN 1 +ΔP 2 *ΔN 2 +ΔP 3 *ΔN 3 +ΔP 4 *ΔN 4 +ΔP 5 *ΔN 5 In combination with the exhaust solenoid valve operating parameter (DeltaP) d ,△N d ) And the operation times of the exhaust solenoid valve in unit time T can be obtained by proportional operation of pressure change as follows:
furthermore, the locomotive running time of one year can be converted by the action frequency of the exhaust electromagnetic valve in the unit time T, and the action frequency of the exhaust electromagnetic valve is N d 365, the fatigue life performance index of the selected brand solenoid valve is combined, and the fatigue life of the exhaust solenoid valve which can be used in the brake control system can be calculated.
A solenoid valve operation number acquisition step S2 including an inflation solenoid valve operation number acquisition step S22;
the inflation solenoid valve operation number acquisition step S22 includes: an inflation solenoid valve release action frequency acquisition step S221 and an inflation solenoid valve air supplement action frequency acquisition step S222;
the solenoid valve fatigue life estimating step S3 includes a charging solenoid valve fatigue life estimating step S32.
When locomotive braking system implements to alleviate, need step up balanced reservoir, brake controller can control the solenoid valve of aerifing and fill the wind and step up, and when balanced reservoir steady voltage, because mechanical pipeline gas leakage, brake controller also can control the solenoid valve of aerifing and mend the wind and step up, consequently the action number of times of the solenoid valve of aerifing can divide into two parts: the action times of the inflation electromagnetic valve when the balance air cylinder is boosted, namely the action times of the inflation electromagnetic valve for relieving, and the action times of the inflation electromagnetic valve when the balance air cylinder is stabilized, namely the action times of the inflation electromagnetic valve for supplementing air.
Specifically, the inflation solenoid valve mitigating action number obtaining step S221 is: boost rate request parameter (Δ P) specified according to pressure control rate criteria of a locomotive brake control system u ,△T u ) The action parameter (delta P) of the inflation electromagnetic valve when the pressure changes is obtained by the special test of the laboratory u ,△N u )；
According to the operating parameters (delta P) of the charging solenoid valve u ,△N u ) Pressure variation quantity delta P of each brake position n And the number of times of each gate operation n By proportional operation of pressure change, unit time is obtainedTime T internal inflation electromagnetic valve alleviation action times N 1 u ；
For a brake control system with five brake positions, the brake position number k is 5, when the locomotive brake system relieves the brake, the boosting of a balance cylinder is realized through an inflation electromagnetic valve, so that the total pressure variation realized through the inflation electromagnetic valve in 1 day per unit time is equal to delta P 1 *ΔN 1 +ΔP 2 *ΔN 2 +ΔP 3 *ΔN 3 +ΔP 4 *ΔN 4 +ΔP 5 *ΔN 5 In combination with the operating parameters (Delta P) of the inflation solenoid valve u ,△N u ) Through proportional operation of pressure change, the number of times of relieving actions of the inflation solenoid valve in one day can be obtained as follows:
specifically, the step S222 of acquiring the number of times of air supply actions of the inflation solenoid valve includes:
time of voltage stabilization T h An acquisition step;
stabilized gas leakage rate P l An acquisition step;
calculating the number N of air supplement actions of the inflating solenoid valve in unit time T 2 u And (5) carrying out the following steps.
When the locomotive braking system operates, the balance air cylinder is in three states of braking, relieving and stabilizing pressure, so that the collected locomotive operation unit time T is the pressure stabilizing time T of the balance air cylinder h Air exhaust time T d And time of air charging T u The relationship of (1) is: t is h ＝T-T d -T u 。
In particular, the stabilization time T h The acquisition step comprises:
according to the decompression rate requirement parameter (delta P) d ,△T d ) Pressure variation quantity delta P of each brake position n And each gate positionNumber of operation DeltaN n Calculating the time T of the air exhaust action d ，
according to a boost rate requirement parameter (Δ P) u ,△T u ) Pressure variation quantity delta P of each brake position n And the number of times of operation of each gate position n Calculating the time T of the air-charging action u ，
according to the collected unit time T and the air exhaust action time T d And time T of air charging action u Calculating the voltage stabilization time T h ，T h ＝T-T u -T d . And counting by taking unit time as one day, wherein T is 24 h.
Specifically, the steady pressure gas leakage amount P l The acquisition step comprises:
mechanical line leak parameter (Δ P) specified according to pressure control rate criteria of a locomotive brake control system h ,△T h ) By the time of regulation of voltage T h The proportional operation of (A) to obtain the leakage quantity P of the stabilized pressure gas l ，
Specifically, the number N of air supplement actions of the inflating electromagnetic valve in unit time T is calculated 2 u The method comprises the following steps:
according to a boost rate requirement parameter (Δ P) u ,△T u ) Pressure-stabilized gas leakage quantity P l Obtaining the number N of air supplement actions of the inflating electromagnetic valve in unit time T through proportional operation of pressure change 2 u ，
Specifically, the inflation solenoid valve fatigue life estimation step S32 includes: according to the number N of times of action of relieving the inflating electromagnetic valve in the unit time T 1 u And the number N of air supplement actions of the inflating electromagnetic valve in the unit time T 2 u Calculating the total number of times N of the actions of the inflating solenoid valve in the unit time T u ，N u ＝N 1 u +N 2 u According to N u And converting the total action times of the air inflation solenoid valve in one year of locomotive operation, and calculating the fatigue life of the air inflation solenoid valve by combining the fatigue life performance index of the air inflation solenoid valve.
As shown in fig. 2, the present application also provides an embodiment of a fatigue life evaluation system for a solenoid valve of a locomotive brake system, including:
the locomotive running information acquisition unit 1 is used for acquiring pressure variation quantity delta P of each brake position of the brake controller in unit time T n And the number of times of operation of each gate position n N belongs to {1,2,3, · · k }, and k is the total number of brake positions of the brake controller;
the electromagnetic valve action frequency acquisition unit 2 is used for acquiring the action parameters of the electromagnetic valve during pressure change through special test of a laboratory according to the pressure control rate standard of the locomotive brake control system and combining the pressure change quantity delta P n And the number of times of operation of each gate position is Delta N n Obtaining the action times of the electromagnetic valve in unit time T through proportional operation of pressure change;
and the electromagnetic valve fatigue life estimation unit 3 is used for calculating the fatigue life of the electromagnetic valve according to the action times of the electromagnetic valve in the unit time T and by combining the fatigue life performance index of the electromagnetic valve.
The present application is described in detail with reference to the following examples, which are only preferred embodiments of the present application and should not be construed as limiting the scope of the present application.
Example 1
A locomotive brake system operates under a constant pressure of 500kPa in a primary relieving mode, carries out fatigue life assessment on an exhaust electromagnetic valve and an inflation electromagnetic valve for a balance cylinder of the locomotive brake system, and a brake controller of the locomotive brake system has 5 brake positions including a primary braking position, a full braking position, a restraining position, a reconnection position and an emergency position and 1 relieving brake position of a running position. Firstly, acquiring pressure variation quantities and five brake position action times of a brake controller by a locomotive operation information acquisition step, wherein the acquired unit time is one day, and the pressure variation quantities are respectively delta P 1 ＝50KPa、△P 2 ＝140KPa、△P 3 ＝140KPa、△P 4 ＝500KPa、△P 5 500KPa, the number of operation times is Deltan 1 ＝12，△N 2 ＝30，△N 3 ＝5，△N 4 ＝12，△N 5 ＝5。
TJ/JW 039- u ,△T u ) Is (480KPa,9 s); decompression Rate requirement parameter (Δ P) d ,△T d ) Is (140KPa,6 s); leakage Rate requirement parameter (Δ P) at pressure holding h ,△T h ) Is (10KPa,300 s). According to the pressure increasing rate requirement parameter, the pressure reducing rate requirement parameter and the leakage rate requirement parameter specified by the standard, the action parameter (delta P) of the exhaust electromagnetic valve when the pressure changes is obtained by the special test of a laboratory d ,△N d ) Is (140KPa,11 times), the operating parameter (delta P) of the charging solenoid valve u ,△N u ) Is (50KPa,5 times).
Then, obtaining the number of times of the solenoid valve operationAccording to the action parameters of the exhaust electromagnetic valve, combining the pressure variation and the action times of each brake position, and obtaining the action times N of the exhaust electromagnetic valve through proportional operation of the pressure variation d ，
Further, in the step of estimating the fatigue life of the electromagnetic valve, the operation time of the locomotive for one year is calculated according to the obtained action times 1100 of the exhaust electromagnetic valve within 1 day per unit time, the action times of the exhaust electromagnetic valve is 1100 × 365-401500 times, the fatigue life performance index of the exhaust electromagnetic valve selected by the balance cylinder is 1000 ten thousand times, and the fatigue life of the exhaust electromagnetic valve is about 25 years.
Further, the action times N of the inflation solenoid valve is obtained through proportional operation of pressure change according to the action parameters of the inflation solenoid valve and by combining the pressure variation and the action times of each brake position through the step of obtaining the action times of the solenoid valve 1 u ，
Further, according to the parameters required by the decompression rate, the air exhaust action time T is obtained d ，
According to the parameters of the pressure increasing speed requirement, the air charging action time T is obtained u ，
Then, according to the collected unit time T and the air exhaust action time T d And time T of air charging action u Calculating the voltage stabilization time T h ，
T h ＝24*60*60-600-262.5＝85537.5。
Then, through the voltage stabilization time T h The proportional operation of the pressure-stabilizing gas leakage quantity P is obtained l ，
Then according to the required parameters of the pressure increasing rate and the leakage quantity of the stabilized pressure gas, the air supplement action times N of the inflation electromagnetic valve in unit time is obtained through the proportional operation of pressure change 2 u ，
Further, according to the fatigue life estimation step of the electromagnetic valve, the action relieving times N of the inflation electromagnetic valve are calculated 1 u And the number of times of air supplement actions N of the air charging solenoid valve 2 u Calculating the total number of times N of the action of the inflation solenoid valve u ，N u ＝N 1 u +N 2 u 1400+ 285.125-1685.125, based on N u The total action times of the inflation solenoid valve in the time of one year of the locomotive running is converted into 1685.125 × 365 ═ 615070.625, the fatigue life performance index of the inflation solenoid valve selected by the brake control system is 1000 ten thousand times, and the fatigue life of the inflation solenoid valve is further calculated to be about 16 years.
The maintenance service personnel of the locomotive arranges the replacement plan of the exhaust electromagnetic valve and the inflation electromagnetic valve according to the obtained fatigue life of the exhaust electromagnetic valve and the inflation electromagnetic valve, and reasonably replaces the exhaust electromagnetic valve and the inflation electromagnetic valve at a proper time point, thereby avoiding the occurrence of braking faults of the locomotive caused by the fact that the exhaust electromagnetic valve or the inflation electromagnetic valve exceeds the fatigue life.
Claims (9)
1. A method for evaluating fatigue life of an electromagnetic valve for a locomotive brake system is characterized by comprising the following steps:
acquiring locomotive operation information: braking control in acquisition unit time TPressure variation quantity delta P of each brake position of brake n And the number of times of operation of each gate position n ；
Acquiring the action times of the electromagnetic valve: according to the pressure control rate standard of the locomotive brake control system, the action parameters of the electromagnetic valve during pressure change are obtained through special test of a laboratory, and the pressure change quantity delta P is combined n And the number of times of operation DeltaN of each gate position n Obtaining the action times of the electromagnetic valve in unit time T through proportional operation of pressure change;
estimating the fatigue life of the electromagnetic valve: calculating the fatigue life of the electromagnetic valve according to the action times of the electromagnetic valve in the unit time T and by combining the fatigue life performance index of the electromagnetic valve;
Wherein n belongs to {1,2,3, · · k }, and k is the total number of brake bits of the brake controller;
the electromagnetic valve action frequency acquiring step comprises an exhaust electromagnetic valve action frequency acquiring step;
the exhaust solenoid valve operation frequency acquiring step acquires the operation frequency N of the exhaust solenoid valve in unit time T through the following model d ：
Wherein, Δ P d Representing the amount of change, DeltaN, in the pressure drop d Shows the amount of change Δ P in the pressure drop d The number of times of operation of the exhaust solenoid valve.
2. The method for evaluating fatigue life of an electromagnetic valve for a locomotive brake system according to claim 1, wherein the electromagnetic valve operation number obtaining step includes an exhaust electromagnetic valve operation number obtaining step and an inflation electromagnetic valve operation number obtaining step;
the electromagnetic valve fatigue life estimation step comprises an exhaust electromagnetic valve fatigue life estimation step and an inflation electromagnetic valve fatigue life estimation step.
3.The method for evaluating the fatigue life of the solenoid valve for the locomotive brake system according to claim 2, wherein the step of estimating the fatigue life of the exhaust solenoid valve comprises the steps of: according to the action times N of the exhaust solenoid valve in the unit time T d And calculating the fatigue life of the exhaust electromagnetic valve by combining the fatigue life performance index of the exhaust electromagnetic valve.
4. The method for evaluating fatigue life of a solenoid valve for a locomotive brake system according to claim 2, wherein the step of acquiring the number of times of actuation of the charging solenoid valve comprises: the method comprises an inflation solenoid valve action relieving frequency obtaining step and an inflation solenoid valve air supplementing action frequency obtaining step.
5. The method of evaluating a fatigue life of an electromagnetic valve for a locomotive brake system according to claim 4, wherein the operation number of mitigating actions N of the inflation electromagnetic valve in the unit time T is obtained by the following model 1 u ：
Wherein, Δ P u Indicates the amount of change in pressure rise,. DELTA.N u Shows the amount of change Δ P in the pressure rise u The number of times of operation of the inflation solenoid valve.
6. The method for evaluating fatigue life of an electromagnetic valve for a locomotive brake system according to claim 5, wherein the step of obtaining the number of times of air-replenishing actions of the inflation electromagnetic valve obtains the number of times of air-replenishing actions N of the inflation electromagnetic valve per unit time T from the following model 2 u ：
Wherein, P l The leakage amount of the gas is stabilized.
7. The method of estimating fatigue life of an electromagnetic valve for a locomotive brake system according to claim 6, wherein the steady pressure gas leakage amount P l By means of a model
Is obtained by calculation, wherein h Shows the variation, DeltaT, of the pressure leak h Shows the pressure leak variation DeltaP h Time required, T h Representing the voltage stabilization time; the voltage stabilization time T h Obtained by calculation as follows:
T h ＝T-T u -T d ；
wherein T is the unit time of acquisition, T d For the time of the action of air-exhausting, T u The time of the air charging action;
the air exhaust action time T d By means of a model
Calculated acquisition, Δ P d Indicates the amount of change in pressure drop,. DELTA.T d Shows the amount of change Δ P in the pressure drop d The time required;
the air charging action time passes through the model
Calculated to obtain,. DELTA.T u Shows the amount of change Δ P in the pressure rise u The time required.
8. The method for evaluating fatigue life of an electromagnetic valve for a locomotive brake system according to claim 6, wherein the step of estimating fatigue life of the pneumatic electromagnetic valve comprises the steps of: according to the number N of times of action of relieving the inflating electromagnetic valve in the unit time T 1 u And the number of times N of air supplement actions of the inflating electromagnetic valve in the unit time T 2 u Calculating the total number of times N of the actions of the inflating solenoid valve in the unit time T u ，N u ＝N 1 u +N 2 u And calculating the fatigue life of the inflation solenoid valve by combining the fatigue life performance index of the inflation solenoid valve.
9. A system for implementing the method for evaluating fatigue life of the solenoid valve for a locomotive brake system according to any one of claims 1 to 8, comprising:
The locomotive running information acquisition unit is used for acquiring the pressure variation quantity delta P of each brake position of the brake controller in unit time T n And the number of times of operation of each gate position n ；
The electromagnetic valve action frequency acquisition unit is used for acquiring the action parameters of the electromagnetic valve during pressure change through special test of a laboratory according to the pressure control rate standard of the locomotive brake control system and combining the pressure change quantity delta P n And the number of times of operation of each gate position is Delta N n Obtaining the action times of the electromagnetic valve in unit time T through proportional operation of pressure change;
the electromagnetic valve fatigue life estimation unit is used for calculating the fatigue life of the electromagnetic valve according to the action times of the electromagnetic valve in the unit time T and by combining the fatigue life performance index of the electromagnetic valve;
wherein n is the {1,2,3, · · k }, and k is the total number of brake bits of the brake controller.
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