CN108087382A - A kind of Dual-energy source electrohydraudic servomechanism reliability growth test system and method - Google Patents
A kind of Dual-energy source electrohydraudic servomechanism reliability growth test system and method Download PDFInfo
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- CN108087382A CN108087382A CN201711234626.9A CN201711234626A CN108087382A CN 108087382 A CN108087382 A CN 108087382A CN 201711234626 A CN201711234626 A CN 201711234626A CN 108087382 A CN108087382 A CN 108087382A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
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Abstract
A kind of Dual-energy source electrohydraudic servomechanism reliability growth test system and method is mainly used for the reliability growth test of electrohydraudic servomechanism.Design portable loading cylinder assembly and load pump, reliability growth test can be completed under the synthesized stress environments such as temperature, vibration, electricity, pressure, load by trial product, it loads cylinder and realizes positive, Opposite side loading according to different demands, also can realize with being linked by test specimen, loading force is internal force, is not transferred to shake table and humiture case.It during experiment, needs to realize by the free switching of the test specimen electrohydraudic servomechanism electric-motor pump energy and ground pump station according to different, the autonomous working of each energy is realized by check valve, the unlatching of hydraulic control one-way valve, closing.Using three-stage test method, the latter half makes full use of the test data of previous stage, and total testing time is shortened compared with not being segmented.
Description
Technical field
The present invention relates to reliability growth test technology, specifically electrohydraudic servomechanism reliability growth test entirely should
Power combined reliability growth test system and method.
Background technology
Reliability growth test is the development that product reliability is increased to acceptable level, tests and is lacked with exposure
For the purpose of falling into, it is that experiment-analysis-improvement-repetitive process tested again makes product be finally reached reliability requirement.
The design relation of electrohydraudic servomechanism stress profile the accuracy and authenticity of reliability growth test result, when
When product is faced with a variety of working stresses, the common practice of technology is to be carried out using environment comprehensive chamber under no-load condition at present
Humiture, vibration environment reliability growth test, have ignored the application of load stress.
Electrohydraudic servomechanism can work under the conditions of two sets of independent energy resource systems, general reliability growth test be by
The two, which is kept apart, individually carries out reliability growth test, has ignored the linking of the two in the course of work.
Common reliability growth model includes Duane model of growth, AMSAA models etc., for some complex products, such as
The joint product of the technologies such as machinery, electronics, hydraulic pressure, pneumatic, it is impossible to apply intrinsic reliability growth model.
The content of the invention
The present invention is for insufficient existing for existing method, it is proposed that a kind of reliability growth test system and method, effectively
Ground solves the problems, such as the reliability growth test of the electrohydraudic servomechanism of the complex techniques such as mechanical, electrical, liquid, gas, including load stress
Application problem synchronous with environmental stress, the switching problem of Dual-energy source, test period design problem.
The object of the invention is achieved by the following technical programs：
A kind of Dual-energy source electrohydraudic servomechanism reliability growth test system, including：Shake table, vibration tool, humiture
Case, chuck, long spiro nail, axis pin, loading cylinder, flexible hoist cable, power module, test suite and charging assembly；
Equipped with vibration tool on shake table, humiture case is by ground supports, and humiture case bottom center leaves confession
The opening that vibration tool passes through, humiture box top fixing flexible hoist cable, the one end for loading cylinder is suspended in midair by flexible hoist cable, another
End is connected by long spiro nail with chuck, and chuck is installed on by test specimen electrohydraudic servomechanism, and loading cylinder also passes through axis pin and subject
Part electrohydraudic servomechanism connects；It is connected by the bottom of test specimen electrohydraudic servomechanism with vibration tool；
Power module is connected with by test specimen electrohydraudic servomechanism, for providing by the work energy of test specimen electrohydraudic servomechanism
Source drives and is worked by test specimen electrohydraudic servomechanism；
Charging assembly is connected with loading cylinder, for providing the hydraulic coupling of loading cylinder, the liquid that loading cylinder is provided in charging assembly
The lower output loading force of pressure effect；
Test suite is connected with by test specimen electrohydraudic servomechanism, is powered and is surveyed by test specimen electrohydraudic servomechanism for giving
Examination.
The power module includes：Ground pump station, check valve, hydraulic control one-way valve, low-pressure hose and high-pressure hose；
The low pressure hydraulic fluid port and high pressure hydraulic fluid port of ground pump station are respectively by low-pressure hose and high-pressure hose with being watched by test specimen is electro-hydraulic
Mechanism connection is taken, ground pump station high pressure hydraulic fluid port is equipped with check valve, for controlling hydraulic oil one-way flow in high-pressure hose, ground
When pumping plant starts, check valve is opened under the effect of its high pressure, and high-pressure oil flow to by test specimen electrohydraudic servomechanism, close by ground pump station
When, check valve is in cut-off state, prevents to flow to ground pump station by test specimen electrohydraudic servomechanism fluid；
Low pressure hydraulic fluid port is equipped with hydraulic control one-way valve, for controlling one-way flow of the hydraulic oil in low-pressure hose, passes through introducing
The fluid of ground pump station high pressure hydraulic fluid port is controlled, and when ground pump station starts, hydraulic control one-way valve is opened, and oil stream is by electro-hydraulic by test specimen
Servo mechanism flows to ground pump station, forms way to cycle oil, and when ground pump station is closed, hydraulic control one-way valve is closed, and prevents by test specimen electricity
Liquid servo mechanism fluid flows to ground pump station；The Opening pressure of check valve is less than the Opening pressure of hydraulic control one-way valve.
The charging assembly includes the first loading pumping plant hose, the second loading pumping plant hose and loading pumping plant；
Loading pumping plant is connected by the first loading pumping plant hose and the second loading pumping plant hose with loading cylinder, is carried to loading cylinder
Liquid supply pressure is switched by internal valves and realizes biaxial loadings, when the only first loading pumping plant hose is passed through high pressure oil, is realized just
To loading, the low pressure oil loaded in cylinder returns loading pumping plant by the second loading pumping plant hose；When the only second loading pumping plant hose leads to
When entering high pressure oil, Opposite side loading is realized, the low pressure oil loaded in cylinder returns loading pumping plant by the first loading pumping plant hose.
The test suite includes：Intermediate frequency power supply, service cable, servo mechanism test instrument and control cable；
Servo mechanism test instrument is by controlling cable to be connected with by test specimen electrohydraudic servomechanism, for being watched by test specimen is electro-hydraulic
It takes mechanism to be tested, intermediate frequency power supply is given by service cable and powered by test specimen electrohydraudic servomechanism.
Loading cylinder includes loading cylinder cylinder body and loading cylinder piston rod；The top for loading cylinder housing is connected with flexible hoist cable, is added
The lower part for carrying cylinder housing is connected with long spiro nail, and loading cylinder piston rod is located at the centre of loading cylinder cylinder body, loads cylinder piston rod
Lower end be connected by axis pin with by test specimen electrohydraudic servomechanism.
There is step at the long spiro nail both ends, and the piston rod of cylinder is loaded with being passed through by test specimen electrohydraudic servomechanism to /V
Distance when axis pin connects.
The direction of vibration of shake table is total to perpendicular to ground by the axis of test specimen electrohydraudic servomechanism with loading the axis of cylinder
Line, and it is consistent with the direction of vibration of shake table.
Housing, piston rod, fuel tank and electric-motor pump are included by test specimen electrohydraudic servomechanism, by test specimen electrohydraudic servomechanism two
It works under the kind energy：When worked by test specimen electrohydraudic servomechanism by carrying motor pump startup, fuel tank storage fluid, second is that by
Test specimen electrohydraudic servomechanism works under ground pump station driving；
It is real by check valve and hydraulic control one-way valve by the electric-motor pump of test specimen electrohydraudic servomechanism and ground pump station free switching
Existing electric-motor pump and ground pump station isolate and holding, the open and close of check valve and hydraulic control one-way valve is controlled, to electro-hydraulic by test specimen
The fuel tank of servo mechanism carries out oil-filled.
A kind of Dual-energy source electrohydraudic servomechanism Reliability Growth Test Method, step are as follows：
Step 1: reliability growth test is divided into three phases, the desired value in each stage, the target of phase III are set
It is worth to test catalogue scale value；
Step 2: setting first stage test sample number n1, the Censoring timet0For task when
Between；For first stage desired value；M is form parameter, and α is confidence parameter；
Step 3: carry out first stage experiment；
Step 4: statistics first stage test data, including the first stage failure sample number, failure the sampling test time and
Reach the sample number of Censoring time；
Step 5: setting second stage test sample number n2, the Censoring time Z1(comprising first stage failure sample number, failure sampling test time, reach Censoring for first stage test data
The sample number of time) and Censoring time first stage set；R2LFor second stage reliability R2Confidence lower limit；T+For
Second stage truncated time (common n2It is a) (assuming that no-failure),For second stage desired value；
Step 6: carry out second stage experiment；
Step 7: statistics second stage test data, including second stage failure sample number, failure the sampling test time and
Reach the sample number of Censoring time；
Step 8: setting phase III test sample number n3, the Censoring time
Z2For first and second step-by-step test data (comprising first,
Second order segment fault sample number, failure sampling test time, the sample number for reaching the Censoring time) and the timing of first and second stage
The set of truncated time；R3LFor phase III reliability R3Confidence lower limit；T+For phase III truncated time (common n3It is a) it is (false
If no-failure),For phase III desired value；
Step 9: carry out phase III experiment；
Step 10: first, second and third step-by-step test data of statistics, refer to first, second and third stage failure sample number, failure sample
This test period and the sample number for reaching the Censoring time.
The first stage experiment, second stage experiment, phase III experiment carry out as follows：
(1) 0min, start-up loading pumping plant, humiture case start to cool down, while start servo mechanism test instrument；
(2) 30min, humiture case is cooled to -20 DEG C, and enters keeping warm mode；
(3) 150min, the heat preservation of humiture case terminate, and humiture case starts to warm up；Start intermediate frequency power supply simultaneously, by test specimen electricity
After liquid servo mechanism obtains power supply, by motor pump work, work fluid is from fuel tank, operating pressure 17MPa；
(4) 160min closes intermediate frequency power supply, and motor pump work terminates, and is powered to starting and terminate, starts ground pump station, subject
Part electrohydraudic servomechanism enters drainage working condition, operating pressure 27MPa, while opens shake table, applies vibration environment stress,
Humiture case heating simultaneously starts；
(5) 180min continues to work under drainage state by test specimen electrohydraudic servomechanism, and shake table works on, warm and humid
Degree case is warming up to 60 DEG C, and enters keeping warm mode；
(6) 190min closes shake table, reduces ground pump station pressure to check valve unlatching, hydraulic control one-way valve and closes scope,
It is monitored by servo mechanism test instrument by test specimen electrohydraudic servomechanism oil tank liquid level, ground pump station is closed after meeting the requirements, completed
Oil feeding process；
(7) 240min, soak terminate, and a Xun Huan is terminated.
The present invention has the advantages that compared with the prior art：
1) stress profile that setting can be pressed during present invention experiment applies temperature, vibration, electricity, pressure, load iso-stress
Value.Hydraulic load loading cylinder can realize positive, negative sense loading, can also realize with being linked by test specimen, loading force is internal force, will not
It is transferred to shake table and humiture case；
2) present invention can be realized by test specimen electrohydraudic servomechanism during experiment carries electric-motor pump and the ground pump station energy
Dual-energy source switching, improve the adequacy and validity of experiment.
3) for the present invention using three-stage test method, the latter half makes full use of the test data of previous stage, with regardless of
Section, which compares, shortens total testing time.
4) present system and test method are at low cost, can fully verify the comprehensive performance of product, loading cylinder, loading pumping plant
System is suitble to the load test in the combined test chamber of all kinds of piston output type hydraulic servomechanisms, and Dual-energy source automatically switches design
It is suitble to the hydraulic servomechanism class product that all kinds of self energy component caloric values are big, the working time is short.The reliability of its segmented
Growth test method is suitble to the electromechanical integrated product of all kinds of Weibull Distributed Units.
Description of the drawings
Below with reference to attached drawing and implementation, the invention will be further described.
Fig. 1 is electrohydraudic servomechanism reliability growth test schematic diagram of the present invention；
Fig. 2 is the present invention by test specimen electrohydraudic servomechanism schematic diagram；
Fig. 3 is present invention loading cylinder schematic diagram；
Fig. 4 is three stage reliability growth test flow charts of the invention；
Fig. 5 is reliability test stress sectional drawing of the present invention；
In figure, 1-shake table, 2-vibration tool, 3-humiture case, 4-by test specimen electrohydraudic servomechanism, 5-chuck,
6-long spiro nail, 7-axis pin, 8-loading cylinder, 9-flexible hoist cable, 10-ground pump station, 11-for check valve, 12-hydraulic control list
To valve, 13-ground pump station low-pressure hose, 14-ground pump station high-pressure hose, 15-intermediate frequency power supply, 16-service cable, 17-
Servo mechanism test instrument, 18：Control cable, 19,20-loading pumping plant hose, 21-loading pumping plant.
401-by test specimen electrohydraudic servomechanism housing, 402-by test specimen electrohydraudic servomechanism piston rod, 403-by test specimen
Electrohydraudic servomechanism fuel tank, 404-by test specimen electrohydraudic servomechanism electric-motor pump, 801-loading cylinder cylinder body, 802-loading cylinder work
Stopper rod.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with implementation of the attached drawing to the present invention
Mode is described in further detail.
The present invention proposes a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system and method, devises portable
Formula loads cylinder assembly and load pump, and reliability growth test can be completed under compbined test environment by trial product, loads cylinder root
Positive, Opposite side loading is realized according to different demands, can also be realized with being linked by test specimen.Designed card slot in trial product, by chuck,
Long spiro nail is connected with loading cylinder, is connected by test specimen piston rod with loading cylinder piston rod by axis pin.
During experiment, need to realize by oneself of the test specimen electrohydraudic servomechanism electric-motor pump energy and ground pump station according to different
By switching, the autonomous working of each energy is realized by check valve, the unlatching of hydraulic control one-way valve, closing.It can be by certainly by trial product
The band energy and ground pump station alternately start, and fully carry out certification test, when ground pump station starts, check valve, hydraulic control one-way valve exist
It is automatically turned under pressure, the shut-in time of shut down by ground pump station pressure control one-way valve and hydraulic control one-way valve, ensures subject
Certain fluid is filled in product fuel tank, is used in case being carried by trial product when the electric-motor pump energy starts.When carrying energy startup,
Check valve, hydraulic control one-way valve are closed, and realization is isolated with ground pump station.
The characteristics of Weibull distribution is obeyed according to mechanical, electrical, liquid, gas integral life of product, using three-stage test method,
The latter half test period makes full use of the data of previous stage when determining, substantially reduce total time on test.
Fig. 1 is electrohydraudic servomechanism reliability growth test system schematic of the present invention, shake table 1, vibration tool 2, warm
Humidity cabinet 3, chuck 5, long spiro nail 6, axis pin 7, loading cylinder 8, flexible hoist cable 9, power module, test suite and charging assembly；
Equipped with vibration tool 2 on shake table 1, humiture case 3 is by ground supports, and 3 bottom center of humiture case is stayed
There are the opening passed through for vibration tool 2,3 top fixing flexible hoist cable 9 of humiture case, one end of loading cylinder 8 passes through flexible hoist cable 9
Suspention, the other end are connected by long spiro nail 6 with chuck 5, and chuck 5 is installed on by test specimen electrohydraudic servomechanism 4, and loading cylinder 8 is also
It is connected by axis pin 7 with by test specimen electrohydraudic servomechanism 4；It is connected by the bottom of test specimen electrohydraudic servomechanism 4 with vibration tool 2；
Power module is connected with by test specimen electrohydraudic servomechanism 4, for providing by the work energy of test specimen electrohydraudic servomechanism 4
Source drives and is worked by test specimen electrohydraudic servomechanism 4；
Power module includes：Ground pump station 10, check valve 11, hydraulic control one-way valve 12, low-pressure hose 13 and high-pressure hose 14；
The low pressure hydraulic fluid port and high pressure hydraulic fluid port of ground pump station 10 are respectively by low-pressure hose 13 and high-pressure hose 14 and by test specimen
Electrohydraudic servomechanism 4 connects, and 10 high pressure hydraulic fluid port of ground pump station is equipped with check valve 11, for controlling hydraulic oil in high-pressure hose 14
One-way flow, when ground pump station 10 starts, check valve 11 is opened under the effect of its high pressure, and high-pressure oil flow is to by test specimen electro-hydraulic servo
Mechanism 4, when ground pump station 10 is closed, check valve 11 is in cut-off state, prevents to flow to ground by 4 fluid of test specimen electrohydraudic servomechanism
Face-pumping station 10；
Low pressure hydraulic fluid port is equipped with hydraulic control one-way valve 12, for controlling one-way flow of the hydraulic oil in low-pressure hose 13, passes through
Introduce 10 high pressure hydraulic fluid port of ground pump station fluid controlled, ground pump station 10 start when, hydraulic control one-way valve 12 is opened, oil stream by
Ground pump station 10 is flowed to by test specimen electrohydraudic servomechanism 4, forms way to cycle oil, when ground pump station 10 is closed, hydraulic control one-way valve 12
It closes, prevents to flow to ground pump station 10 by 4 fluid of test specimen electrohydraudic servomechanism；The Opening pressure of check valve 11 is less than fluid-control one-way
The Opening pressure of valve 12 can prevent in 10 boost process of ground pump station that hydraulic control one-way valve 12 was opened compared to check valve 11 and lead slowly
Oil return line is caused to block, it also can be by the way that the pressure of ground pump station 10 be set in completion pair between check valve 11 and hydraulic control one-way valve 12
By the oil-filled of 4 fuel tank 404 of test specimen electrohydraudic servomechanism.
Charging assembly is connected with loading cylinder 8, and for providing the hydraulic coupling of loading cylinder 8, loading cylinder 8 is provided in charging assembly
Loading force is exported under action of hydraulic force；
Test suite is connected with by test specimen electrohydraudic servomechanism 4, is powered and is carried out by test specimen electrohydraudic servomechanism 4 for giving
Test.Test suite includes：Intermediate frequency power supply 15, service cable 16, servo mechanism test instrument 17 and control cable 18；
Servo mechanism test instrument 17 is by controlling cable 18 to be connected with by test specimen electrohydraudic servomechanism 4, for by test specimen
Electrohydraudic servomechanism 4 is tested, and intermediate frequency power supply 15 is given by service cable 16 and powered by test specimen electrohydraudic servomechanism 4.
Charging assembly includes the first loading pumping plant hose 19, second and loads pumping plant hose 20 and loading pumping plant 21；Load pump
It stands and 21 is connected by the first loading pumping plant hose 19 and the second loading pumping plant hose 20 with loading cylinder 8, the loading offer hydraulic pressure of cylinder 8 is provided
Power realizes biaxial loadings by internal valves switching, when the only first loading pumping plant hose 19 is passed through high pressure oil, realizes positive add
It carries, the low pressure oil loaded in cylinder 8 returns loading pumping plant 21 by the second loading pumping plant hose 20；When the only second loading pumping plant hose 20
When being passed through high pressure oil, Opposite side loading is realized, the low pressure oil loaded in cylinder 8 returns loading pumping plant by the first loading pumping plant hose 19
21。
3 sidewall design of humiture case has low-pressure hose 13, high-pressure hose 14, service cable 16, control cable 18, first to add
It carries pumping plant hose 19, second and loads pumping plant hose 20, the opening passed through；6 both ends of long spiro nail are designed with step, are loaded to /V
Distance when 8 piston rod 802 of cylinder by 4 piston rod 402 of test specimen electrohydraudic servomechanism by axis pin 7 with being connected；
As shown in figure 3, loading cylinder 8 includes loading cylinder cylinder body 801 and loading cylinder piston rod 802；Load the upper of cylinder housing 801
Portion is connected with flexible hoist cable 9, and the lower part of loading cylinder housing 801 is connected with long spiro nail 6, and loading cylinder piston rod 802 is located at loading cylinder
The centre of cylinder body 801, the lower end of loading cylinder piston rod 802 pass through axis pin 7 and the piston rod by test specimen electrohydraudic servomechanism 4
402 connections are used as an integral installation on shake table 1, the vibration of shake table 1 by test specimen electrohydraudic servomechanism 4 and loading cylinder 8
Direction is perpendicular to ground, by the axis collinear of the axis of test specimen electrohydraudic servomechanism 4 and loading cylinder 8, and with the vibration of shake table 1
Direction is consistent.Loading force is internal force, is not transferred to shake table 1 and humiture case 3.
As shown in Fig. 2, housing 401, piston rod 402, fuel tank 403 and electric-motor pump are included by test specimen electrohydraudic servomechanism 4
404, it is worked by test specimen electrohydraudic servomechanism 4 under two kinds of energy：First, by test specimen electrohydraudic servomechanism 4 by carrying electric-motor pump
404 start work, and fuel tank 403 stores fluid, second is that being worked by test specimen electrohydraudic servomechanism 4 in the case where ground pump station 10 drives；
By the electric-motor pump 404 of test specimen electrohydraudic servomechanism 4 and 10 free switching of ground pump station, pass through check valve 11 and hydraulic control
Check valve 12 realize electric-motor pump 404 and ground pump station 10 isolate and holding, control check valve 11 and hydraulic control one-way valve 12 are opened
Closing is opened, it is oil-filled to being carried out by the fuel tank 403 of test specimen electrohydraudic servomechanism 4.Switch to when carrying working energy, experiment process without
It is additional oil-filled that progress need to be shut down.
Three stage reliability growth test flow charts are as shown in Figure 4, it is first determined the reliability growth test of first stage
Desired value determines the test period and sample number of first stage according to desired value, the test data further according to the first stage and
The reliability growth desired value of two-stage determines reliability test time and the sample number of second stage, according to first and second stage
Test data and three phases reliability growth desired value, determine three phases the reliability growth test time and
Sample number, step are as shown in Figure 4：
Step 1: reliability growth test is divided into three phases, the desired value in each stage, the target of phase III are set
It is worth to test catalogue scale value；
Step 2: setting first stage test sample number n1, the Censoring timet0For task
Time；For first stage desired value；M is form parameter, and α is confidence parameter；
Step 3: carry out first stage experiment；
Step 4: statistics first stage test data, including the first stage failure sample number, failure the sampling test time and
Reach the sample number of Censoring time；
Step 5: setting second stage test sample number n2, the Censoring time Z1(comprising first stage failure sample number, failure sampling test time, reach Censoring for first stage test data
The sample number of time) and Censoring time first stage set；R2LFor second stage reliability R2Confidence lower limit；T+For
Second stage truncated time (common n2It is a) (assuming that no-failure),For second stage desired value；
Step 6: carry out second stage experiment；
Step 7: statistics second stage test data, including second stage failure sample number, failure the sampling test time and
Reach the sample number of Censoring time；
Step 8: setting phase III test sample number n3, the Censoring time
Z2For first and second step-by-step test data (comprising first,
Second order segment fault sample number, failure sampling test time, the sample number for reaching the Censoring time) and the timing of first and second stage
The set of truncated time；R3LFor phase III reliability R3Confidence lower limit；T+For phase III truncated time (common n3It is a) it is (false
If no-failure),For phase III desired value；
Step 9: carry out phase III experiment；
Step 10: first, second and third step-by-step test data of statistics, including first, second and third stage failure sample number, failure sample
This test period and the sample number for reaching the Censoring time；
Step 11: reliability assessment, according to first, second and third step-by-step test data, assessment reliability value.
After reliability test stress sectional drawing is as shown in figure 5, determine per step-by-step test total time, by each test cycle 4h
Carry out experiment,
The experiment of above-mentioned carry out three phases, specific steps are identical, as follows:
1st, 0min, start-up loading pumping plant (21), humiture case (3) starts to cool down, while starts servo mechanism test instrument
(17)；
2nd, 30min, humiture case (3) is cooled to -20 DEG C, and enters keeping warm mode；
3rd, 150min, (3) -20 DEG C of heat preservations of humiture case terminate, and humiture case (3) starts to warm up；Start medium frequency electric simultaneously
Source (15) after obtaining 380V power supplys by test specimen electrohydraudic servomechanism (4), is worked by carrying electric-motor pump (403), and work fluid
From fuel tank (404), operating pressure 17MPa；
4th, 160min, Central Shanxi Plain frequency power (15) carry electric-motor pump (403) work and terminate, and are powered to starting and terminate, start ground
Pumping plant (10) by test specimen electrohydraudic servomechanism (4) into drainage working condition, operating pressure 27MPa, while opens shake table
(1), vibration environment stress is applied, while humiture case (3) heating starts；
5th, 180min continues to work under drainage state by test specimen electrohydraudic servomechanism (4), and shake table (1) works on,
Humiture case (3) is warming up to 60 DEG C, and enters keeping warm mode.
6th, 190min closes shake table (1), reduces ground pump station (10) pressure to check valve (11) unlatching, fluid-control one-way
Valve (12) closes scope, is monitored by servo mechanism test instrument (17) by test specimen electrohydraudic servomechanism (4) fuel tank (404) liquid level,
Ground pump station is closed after meeting the requirements, completes Oil feeding process.
7th, 240min, soak terminate, and a Xun Huan is terminated.
The stress profile that setting can be pressed during experiment applies temperature, vibration, electricity, pressure, load iso-stress value.Hydraulic pressure is born
Positive, negative sense loading can be realized by carrying loading cylinder, can also be realized with being linked by test specimen, loading force is internal force, is not transferred to and shakes
Dynamic platform and humiture case；It can be realized during experiment by test specimen electrohydraudic servomechanism and carry electric-motor pump and the ground pump station energy
Dual-energy source switches, and improves the adequacy and validity of experiment.Using three-stage test method, the latter half makes full use of previous
The test data in stage, shortens total testing time compared with not being segmented.The system and test method are at low cost, can fully verify
The comprehensive performance of product, loading cylinder, loading pumping station system are suitble to the combined test chamber of all kinds of piston output type hydraulic servomechanisms
In load test, Dual-energy source automatically switches design and is suitble to all kinds of self energy component caloric values are big, the working time is short hydraulic pressure
Servo mechanism class product.The Reliability Growth Test Method of its segmented is suitble to the electromechanics one of all kinds of Weibull Distributed Units
Body product.
Claims (10)
1. a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system, it is characterised in that including：Shake table (1), vibration
Frock (2), humiture case (3), chuck (5), long spiro nail (6), axis pin (7), loading cylinder (8), flexible hoist cable (9), power module,
Test suite and charging assembly；
Equipped with vibration tool (2) on shake table (1), humiture case (3) is by ground supports, and in humiture case (3) bottom
Leave the opening passed through for vibration tool (2), humiture case (3) top fixing flexible hoist cable (9), one end of loading cylinder (8) in centre
It is suspended in midair by flexible hoist cable (9), the other end is connected by long spiro nail (6) with chuck (5), and chuck (5) is installed on electro-hydraulic by test specimen
In servo mechanism (4), loading cylinder (8) is also connected by axis pin (7) with by test specimen electrohydraudic servomechanism (4)；It is watched by test specimen is electro-hydraulic
The bottom for taking mechanism (4) is connected with vibration tool (2)；
Power module is connected with by test specimen electrohydraudic servomechanism (4), for providing by the work energy of test specimen electrohydraudic servomechanism (4)
Source drives and is worked by test specimen electrohydraudic servomechanism (4)；
Charging assembly is connected with loading cylinder (8), and for providing the hydraulic coupling of loading cylinder (8), loading cylinder (8) is provided in charging assembly
Action of hydraulic force under export loading force；
Test suite is connected with by test specimen electrohydraudic servomechanism (4), is powered and is carried out by test specimen electrohydraudic servomechanism (4) for giving
Test.
2. a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system according to claim 1, it is characterised in that：
The power module includes：Ground pump station (10), check valve (11), hydraulic control one-way valve (12), low-pressure hose (13) and high pressure are soft
It manages (14)；
The low pressure hydraulic fluid port and high pressure hydraulic fluid port of ground pump station (10) pass through low-pressure hose (13) and high-pressure hose (14) and subject respectively
Part electrohydraudic servomechanism (4) connects, and ground pump station (10) high pressure hydraulic fluid port is equipped with check valve (11), for controlling hydraulic oil in high pressure
Hose (14) interior one-way flow, ground pump station (10) start when, check valve (11) its high pressure effect under open, high-pressure oil flow to
By test specimen electrohydraudic servomechanism (4), when ground pump station (10) is closed, check valve (11) is in cut-off state, prevents by test specimen electricity
Liquid servo mechanism (4) fluid flows to ground pump station (10)；
Low pressure hydraulic fluid port is equipped with hydraulic control one-way valve (12), for controlling one-way flow of the hydraulic oil in low-pressure hose (13), passes through
The fluid for introducing ground pump station (10) high pressure hydraulic fluid port is controlled, and when ground pump station (10) starts, hydraulic control one-way valve (12) is opened,
Oil stream forms way to cycle oil by flowing to ground pump station (10) by test specimen electrohydraudic servomechanism (4), when ground pump station (10) is closed,
Hydraulic control one-way valve (12) is closed, and prevents to flow to ground pump station (10) by test specimen electrohydraudic servomechanism (4) fluid；Check valve (11)
Opening pressure is less than the Opening pressure of hydraulic control one-way valve (12).
3. a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system according to claim 1, it is characterised in that：
The charging assembly includes the first loading pumping plant hose (19), the second loading pumping plant hose (20) and loading pumping plant (21)；
Pumping plant (21) is loaded by the first loading pumping plant hose (19) and the second loading pumping plant hose (20) with loading cylinder (8) even
It connects, provides hydraulic coupling to loading cylinder (8), switched by internal valves and realize biaxial loadings, when the only first loading pumping plant hose
(19) when being passed through high pressure oil, realize that forward direction loads, the low pressure oil in loading cylinder (8) is returned by the second loading pumping plant hose (20) to be added
Carry pumping plant (21)；When the only second loading pumping plant hose (20) is passed through high pressure oil, Opposite side loading is realized, load low in cylinder (8)
Pressure oil returns loading pumping plant (21) by the first loading pumping plant hose (19).
4. a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system according to claim 1, it is characterised in that：
The test suite includes：Intermediate frequency power supply (15), service cable (16), servo mechanism test instrument (17) and control cable (18)；
Servo mechanism test instrument (17) is by controlling cable (18) to be connected with by test specimen electrohydraudic servomechanism (4), for subject
Part electrohydraudic servomechanism (4) is tested, and intermediate frequency power supply (15) is given by service cable (16) by test specimen electrohydraudic servomechanism (4)
Power supply.
5. a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system according to claim 1, it is characterised in that
Loading cylinder (8) includes loading cylinder cylinder body (801) and loading cylinder piston rod (802)；It is hung with flexibility on the top of loading cylinder housing (801)
Rope (9) connects, and the lower part of loading cylinder housing (801) is connected with long spiro nail (6), and loading cylinder piston rod (802) is located at loading cylinder cylinder
The centre of body (801), the lower end of loading cylinder piston rod (802) connect by axis pin (7) and by test specimen electrohydraudic servomechanism (4)
It connects.
6. a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system according to claim 5, it is characterised in that：
There is step at described long spiro nail (6) both ends, to the piston rod (802) of /V loading cylinder (8) and by test specimen electrohydraudic servomechanism
(4) distance when being connected by axis pin (7).
7. a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system according to right 1, it is characterised in that：Vibration
The direction of vibration of platform (1) is perpendicular to ground, by the axis collinear of the axis of test specimen electrohydraudic servomechanism (4) and loading cylinder (8), and
It is consistent with the direction of vibration of shake table (1).
8. a kind of Dual-energy source electrohydraudic servomechanism reliability growth test system according to right 1, it is characterised in that：Subject
Part electrohydraudic servomechanism (4) includes housing (401), piston rod (402), fuel tank (403) and electric-motor pump (404), electro-hydraulic by test specimen
Servo mechanism (4) works under two kinds of energy：First, started by test specimen electrohydraudic servomechanism (4) by carrying electric-motor pump (404)
Work, fuel tank (403) storage fluid, second is that being worked by test specimen electrohydraudic servomechanism (4) under ground pump station (10) driving；
By the electric-motor pump (404) of test specimen electrohydraudic servomechanism (4) and ground pump station (10) free switching, by check valve (11) with
Hydraulic control one-way valve (12) realize electric-motor pump (404) and ground pump station (10) isolate and holding, control check valve (11) and hydraulic control
The open and close of check valve (12), it is oil-filled to being carried out by the fuel tank (403) of test specimen electrohydraudic servomechanism (4).
9. a kind of Dual-energy source electrohydraudic servomechanism based on the pilot system realization as any one of claim 1~8 is reliable
Property growth test method, it is characterised in that step is as follows：
Step 1: reliability growth test is divided into three phases, the desired value in each stage is set, the desired value of phase III is
Test catalogue scale value；
Step 2: setting first stage test sample number n1, the Censoring timet0For task time；For first stage desired value；M is form parameter, and α is confidence parameter；
Step 3: carry out first stage experiment；
Step 4: statistics first stage test data, including first stage failure sample number, failure sampling test time and reaches
The sample number of Censoring time；
Step 5: setting second stage test sample number n2, the Censoring time Z1(comprising first stage failure sample number, failure sampling test time, reach Censoring for first stage test data
The sample number of time) and Censoring time first stage set；R2LFor second stage reliability R2Confidence lower limit；T+For
Second stage truncated time (common n2It is a) (assuming that no-failure),For second stage desired value；
Step 6: carry out second stage experiment；
Step 7: statistics second stage test data, including second stage failure sample number, failure sampling test time and reaches
The sample number of Censoring time；
Step 8: setting phase III test sample number n3, the Censoring time
Z2(first and second rank is included for first and second step-by-step test data
Segment fault sample number, failure sampling test time, the sample number for reaching the Censoring time) and first and second stage Censoring
The set of time；R3LFor phase III reliability R3Confidence lower limit；T+For phase III truncated time (common n3It is a) (assuming that nothing
Failure),For phase III desired value；
Step 9: carry out phase III experiment；
Step 10: first, second and third step-by-step test data of statistics, refer to first, second and third stage failure sample number, failure sample examination
It tests the time and reaches the sample number of Censoring time.
10. a kind of Dual-energy source electrohydraudic servomechanism Reliability Growth Test Method according to claim 9, feature exist
In：The first stage experiment, second stage experiment, phase III experiment carry out as follows：
(1) 0min, start-up loading pumping plant (21), humiture case (3) start to cool down, while start servo mechanism test instrument (17)；
(2) 30min, humiture case (3) is cooled to -20 DEG C, and enters keeping warm mode；
(3) 150min, humiture case (3) heat preservation terminate, and humiture case (3) starts to warm up；Start intermediate frequency power supply (15), quilt simultaneously
It after test specimen electrohydraudic servomechanism (4) obtains power supply, is worked by electric-motor pump (403), work fluid is from fuel tank (404), work
Pressure 17MPa；
(4) 160min closes intermediate frequency power supply (15), and electric-motor pump (403) work terminates, and is powered to starting and terminate, starts ground pump station
(10), by test specimen electrohydraudic servomechanism (4) into drainage working condition, operating pressure 27MPa, while shake table (1) is opened, applied
Add vibration environment stress, while humiture case (3) heating starts；
(5) 180min continues to work under drainage state by test specimen electrohydraudic servomechanism (4), and shake table (1) works on, temperature
Humidity cabinet (3) is warming up to 60 DEG C, and enters keeping warm mode；
(6) 190min closes shake table (1), reduces ground pump station (10) pressure to check valve (11) unlatching, hydraulic control one-way valve
(12) scope is closed, is monitored by servo mechanism test instrument (17) by test specimen electrohydraudic servomechanism (4) fuel tank (404) liquid level, it is full
Ground pump station is closed after foot requirement, completes Oil feeding process；
(7) 240min, soak terminate, and a Xun Huan is terminated.
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| CN112146859A (en) * | 2020-09-04 | 2020-12-29 | 上海航天控制技术研究所 | Servo mechanism pneumatic loading device and servo mechanism zero pressure maintaining test method |
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