CN105909596A - Dynamic pressure feedback pressure difference characteristic test system and test method - Google Patents
Dynamic pressure feedback pressure difference characteristic test system and test method Download PDFInfo
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- CN105909596A CN105909596A CN201610450843.0A CN201610450843A CN105909596A CN 105909596 A CN105909596 A CN 105909596A CN 201610450843 A CN201610450843 A CN 201610450843A CN 105909596 A CN105909596 A CN 105909596A
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- servo valve
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
Abstract
The invention discloses a dynamic pressure feedback pressure difference characteristic test system. The dynamic pressure feedback pressure difference characteristic test system mainly comprises a loading servo valve, a tested dynamic pressure feedback servo valve, a loading hydraulic cylinder, a computer, a stop valve, a pressure sensor, a displacement sensor, a low-pass filter and a speed sensor. The invention further discloses a test method for the dynamic pressure feedback pressure difference characteristic test system. According to the dynamic pressure feedback pressure difference characteristic test system and the test method for the dynamic pressure feedback pressure difference characteristic test system, adopting of the test method for testing the dynamic pressure feedback pressure difference characteristics in a computer automatic mode has very important significance to improving the test accuracy and high efficiency of servo valve dynamic pressure feedback network related parameters.
Description
Technical field
The present invention relates to Electrohydraulic Servo Valve Characteristics technical field of measurement and test, be used for testing particularly to one high-precision
The dynamic pressure feedback differential pressure characteristics test system of degree electrohydraulic servo valve and test method.
Background technology
In electrohydraulic servo-controlling system, servo valve is as the core parts of system, by electric part and liquid
Laminate section couples together, it is achieved the conversion of electro-hydraulic signal is amplified with hydraulic pressure, and its performance quality directly decides
The performance of electrohydraulic control system.In the fields such as precise position control, metallurgy, Aero-Space and military affairs,
For solving large inertia Low rigidity system, the damping brought due to structure is little, causes servo-control system stable
Property difference problem, frequently with dynamic pressure feedback servo valve as control element.Moving in dynamic pressure feedback servo valve
Pressure feedback network determines the ability of its suppression load pressure resonance.Normal by setting up the time of dynamic pressure feedback
Number and feedback flow flow gain, carry out dynamic pressure feedback rectification building-out, both can have when dynamic servosystem
Effect ground improves system damping, improves dynamic property, can keep again the rigidity of system when stable state, make system
There is good anti-loading interference performance.Therefore, it is necessary to accurately configuration feedback flow flow gain and time
Between constant, the data qualifier of whole test frequency range could be ensured while suppression resonance.
At present, dynamic pressure feedback characteristic test method is that characterisitic parameter various to dynamic pressure feedback servo valve is carried out point
Pacing tries.Wherein dynamic pressure feedback differential pressure characteristics is to obtain the dynamic pressure under different loads pressure reduction frequency according to test
The characteristic curve of feedback pressure reduction amplitude.In order to obtain the different qualities parameter of dynamic pressure feedback servo valve, existing
Technology needs change test fixture in test process and again debug test parameter, and process is relatively complicated,
A key factor of production efficiency is affected along with the increase of product type and quantity has become as.And test
Process relies on manual pointwise test, artificial interpretation data, and automaticity is low, and data cover face is narrow, surveys
Examination accuracy is relatively low, it is impossible to the most real reflection dynamic pressure feedback characteristic.
Summary of the invention
It is an object of the present invention to provide a kind of dynamic pressure feedback differential pressure characteristics test system.
Further object is that the test side that a kind of dynamic pressure feedback differential pressure characteristics test system is provided
Method.
For reaching above-mentioned purpose, the present invention uses following technical proposals:
A kind of dynamic pressure feedback differential pressure characteristics test system, it mainly includes that loading servo valve, tested dynamic pressure are anti-
Feedback servo valve, loading hydraulic cylinder, computer, stop valve, pressure transducer, displacement transducer, low pass
Wave filter and velocity sensor；
Described loading servo valve includes A mouth, B mouth, oil-feed port P and oil return inlet T, described tested dynamic pressure
Feedback servo valve includes A mouth, B mouth, oil-feed port P, oil return inlet T, feedback cavity A and feedback cavity B,
Described pressure transducer include the first pressure transducer, the second pressure transducer, the 3rd pressure transducer and
4th pressure transducer；Described loading hydraulic cylinder includes A chamber, B chamber, C chamber and D chamber；Described loading
The A mouth of servo valve is sequentially connected with stop valve A and A chamber, and the B mouth of described loading servo valve is sequentially connected with and cuts
Only valve B and B chamber, the A mouth of described tested dynamic pressure feedback servo valve is sequentially connected with shutoff valve C and C chamber,
The B mouth of described tested dynamic pressure feedback servo valve is sequentially connected with stop valve D and D chamber；
The described A mouth of tested dynamic pressure feedback servo valve and the path of shutoff valve C are oil circuit a, described tested
The B mouth of dynamic pressure feedback servo valve and the path of stop valve D are oil circuit b, described oil circuit a and oil circuit b it
Between connect stop valve H；Described oil circuit a is provided with the first pressure transducer, and described oil circuit b is provided with
Two pressure transducers, described feedback cavity A connects the 3rd pressure transducer, and described feedback cavity B connects the 4th
Pressure transducer, piston rod one end of described loading hydraulic cylinder is sequentially connected with displacement transducer and low-pass filtering
Device, the piston rod other end connection speed sensor of described loading hydraulic cylinder；Described low pass filter, speed
Degree sensor, the first pressure transducer, the second pressure transducer, the 3rd pressure transducer and the 4th pressure
Sensor connects computer respectively, and described computer applies control signal to loading servo valve.
Further, described computer mainly includes master controller, data collecting card, man machine interface and DA
Card.
Further, described low pass filter, velocity sensor, the first pressure transducer, the second pressure pass
Sensor, the 3rd pressure transducer and the 4th pressure transducer are connected with described data collecting card respectively, described
Data collecting card is connected with master controller, and described master controller is connected with man machine interface, described master controller
Being connected with DA card, described DA card applies control signal to loading servo valve.
Described loading servo valve, for simulating the fluctuation of load of large inertia controlled device, use one special
Loading servo valve is that tested dynamic pressure feedback servo valve loads.
Described loading hydraulic cylinder, is the basic machine of test system, load the A mouth of servo valve, B mouth with
Loading hydraulic cylinder piston rod two ends connection, the A mouth of tested dynamic pressure feedback servo valve, B mouth with carrier fluid
The piston two ends connection of cylinder pressure.
Described master controller, according to the instruction of test software, is sent amplitude and frequency controlled by master controller
Loading signal, and gather the output signal of pressure transducer and displacement transducer, test software enter
Row data process and draw test curve.
Described data collecting card, with the data transmission that master controller carries out various sensor signal, it is achieved right
The closed loop control of load pressure reduction.
The digital command signal that master controller is sent by described DA card is converted into analog output, for right
Loading servo valve is controlled.
Described stop valve, by the stop valve being switched on or switched off in system, it is possible to achieve different testing experiments
Switching between project.
Institute's displacement sensors, for carrying out position-force control to loading hydraulic cylinder, to ensure at the beginning of piston
Beginning position is positioned at middle position, in order to set up load pressure reduction；Pressure transducer, is used for measuring tested dynamic pressure feedback
The pressure reduction at servo valve load two ends and the pressure reduction at two ends, dynamic pressure feedback loop, i.e. can get dynamic pressure feedback servo
Valve differential pressure characteristics curve.
The test method of described dynamic pressure feedback differential pressure characteristics test system, comprises the steps:
S1: open described stop valve A, stop valve B, shutoff valve C and stop valve D, described loading is watched
Take the A mouth of valve, B mouth and the A mouth of tested dynamic pressure feedback servo valve, B mouth respectively with loading hydraulic cylinder even
Logical, by the main valve plug dieback of tested dynamic pressure feedback servo valve, prevent it from moving back and forth, impact test；
S2: open described stop valve H, utilizes described computer to apply control signal to loading servo valve,
Carry out position feedback by institute's low-pass filtered device of displacement sensors, described loading hydraulic cylinder is implemented position
Put closed loop control, maintain the piston near middle position；
S3: close described stop valve H, utilizes described computer to apply control signal to loading servo valve,
Carry out pressure feedback by pressure transducer, make tested dynamic pressure feedback servo valve be in standard test conditions,
Regulation loads the input sine wave current amplitude size of servo valve, makes the load pressure reduction of tested valve keep setting
Amplitude.In the frequency range of regulation, change different frequency, with the tested dynamic pressure feedback of computer recording
The load pressure reduction of servo valve and feedback pressure reduction, according to the amplitude of the dynamic pressure feedback pressure reduction △ Pd under different frequency
Draw dynamic pressure feedback differential pressure characteristics curve.
Described dynamic pressure feedback differential pressure characteristics curve be exactly dynamic pressure feedback two cavity pressure difference with by charge valve electric current
Relation between frequency.
Described standard test conditions refers to the A chamber of tested dynamic pressure feedback servo valve and the load pressure reduction width in B chamber
Value is 8MPa.
Beneficial effects of the present invention is as follows:
The test method of the computer automated testing dynamic pressure feedback differential pressure characteristics in the employing present invention, to carrying
The test accuracy of high servo valve dynamic-pressure feedback network relevant parameter, high efficiency tool is of great significance.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
Fig. 1 shows the structure chart of dynamic pressure feedback characteristic test system.
Fig. 2 shows the structure chart of dynamic pressure feedback differential pressure characteristics test system.
Fig. 3 shows dynamic pressure feedback differential pressure characteristics curve synoptic diagram.
In figure, the 1.DA card 2. master controller 3. tested dynamic pressure feedback of man machine interface 4. data collecting card 5.
Servo valve 6. loading hydraulic cylinder 7. loads servo valve.
Detailed description of the invention
In order to be illustrated more clearly that the present invention, below in conjunction with preferred embodiments and drawings, the present invention is done into one
The explanation of step.It will be appreciated by those skilled in the art that following specifically described content be illustrative and
Nonrestrictive, should not limit the scope of the invention with this.
Embodiment 1 dynamic pressure feedback characteristic test
Dynamic pressure feedback characteristic test system (as shown in Figure 1) includes loading servo valve (7), tested dynamic pressure
Feedback servo valve (5), loading hydraulic cylinder (6), low pass filter, pressure transducer and flow transducer,
Using master controller (2), DA card (1) and data collecting card (4) as core testing element, man-machine
Interface (3) is as display.
Described loading servo valve (7) includes A mouth, B mouth, oil-feed port P and oil return inlet T, described tested
Dynamic pressure feedback servo valve (5) includes A mouth, B mouth, oil-feed port P, oil return inlet T, feedback cavity A
With feedback cavity B, described pressure transducer include the first pressure transducer, the second pressure transducer, the 3rd
Pressure transducer and the 4th pressure transducer；
Load A, B mouth of servo valve (7) with loading hydraulic cylinder (6) respectively by stop valve A, B even
Connecing, A, B mouth of tested dynamic pressure feedback servo valve (5) and loading hydraulic cylinder (6) are respectively by cut-off
Valve C, D connect；A, B mouth and loading hydraulic cylinder (6) tested dynamic pressure feedback servo valve (5)
Article two, path is respectively equipped with the first pressure transducer and the second pressure transducer, loads servo valve (7)
A, B mouth and two paths of loading hydraulic cylinder (6) between be connected throttle valve A；Load servo valve (7)
B mouth be connected by stop valve E, tested with feedback cavity A of tested dynamic pressure feedback servo valve (5)
The path of dynamic pressure feedback servo valve (5) feedback cavity A and stop valve E is provided with the 3rd pressure transducer, adds
Carry the A mouth of servo valve (7) with feedback cavity B of tested dynamic pressure feedback servo valve (5) by stop valve F
Connect, the path of tested dynamic pressure feedback servo valve (5) feedback cavity B and stop valve F is provided with the 4th pressure
Force transducer；Between A, B mouth and two paths of loading hydraulic cylinder of tested dynamic pressure feedback servo valve
Connect stop valve H, at A, B mouth and two paths of loading hydraulic cylinder of tested dynamic pressure feedback servo valve
Between connect stop valve G and flow transducer；Piston rod one end of described loading hydraulic cylinder (6) is sequentially connected with
Displacement transducer and low pass filter, the piston rod other end connection speed sensing of described loading hydraulic cylinder (6)
Device；Described first pressure transducer, the second pressure transducer, the 3rd pressure transducer, the 4th pressure pass
Sensor, flow transducer, velocity sensor and low pass filter are connected with computer respectively, described calculating
Machine applies control signal to loading servo valve (7).
Described first pressure transducer, the second pressure transducer, the 3rd pressure transducer, the 4th pressure pass
Sensor, flow transducer, velocity sensor and low pass filter are connected with data collecting card (4) respectively,
Described data collecting card (4) is connected with master controller (2), described master controller (2) and man machine interface
(3) connecting, described master controller (2) is connected with DA card (1), and described DA card (1) is to adding
Carry servo valve (7) and apply control signal.
Close the stop valve E of dynamic pressure feedback characteristic test system, stop valve F, stop valve G and choke valve
A, opens stop valve A, stop valve B, shutoff valve C, stop valve D and stop valve H, it is simply that dynamic pressure is anti-
Feed voltage difference characteristic test system (as shown in Figure 2).
Dynamic pressure feedback characteristic test
During static test, open stop valve H, utilize displacement transducer and low pass filter to adding load hydraulic
Cylinder (6) enforcing location closed loop control, maintains the piston near middle position, tested dynamic pressure feedback servo valve (5)
It is in zero-bit state to be easy to set up load pressure reduction.Turn off stop valve H, utilize computer to loading servo
Valve (7) applies control signal, and the pressure reduction amplitude making tested dynamic pressure feedback servo valve (5) load two chambeies reaches
To setting requirement.Feedback cavity A of described tested dynamic pressure feedback servo valve (7) and the load of feedback cavity B
Pressure is read by the 3rd pressure transducer and the 4th pressure transducer.
During dynamic test, the effect of low pass filter is utilized to break position closed loop, tested dynamic pressure feedback servo
Valve (5) impression loads the change of pressure reduction and produces load output flow, causes the reciprocating motion of piston, profit
Size with the output amplitude reflected load output flow of velocity sensor.Described tested dynamic pressure feedback servo
The load pressure reduction of valve (7) is read by the first pressure transducer and the second pressure transducer.
Embodiment 2 dynamic pressure feedback differential pressure characteristics is tested
A kind of dynamic pressure feedback differential pressure characteristics test system, it mainly includes loading servo valve (7), tested dynamic
Pressure feedback servo valve (5), loading hydraulic cylinder (6), computer, stop valve, pressure transducer, displacement
Sensor, low pass filter and velocity sensor；
Described loading servo valve (7) includes A mouth, B mouth, oil-feed port P and oil return inlet T, described tested
Dynamic pressure feedback servo valve includes that (5) include A mouth, B mouth, oil-feed port P, oil return inlet T, feedback cavity A
With feedback cavity B, described pressure transducer include the first pressure transducer, the second pressure transducer, the 3rd
Pressure transducer and the 4th pressure transducer；Described loading hydraulic cylinder (6) includes A chamber, B chamber, C chamber
With D chamber；The A mouth of described loading servo valve (7) is sequentially connected with stop valve A and A chamber, described loading
The B mouth of servo valve (7) is sequentially connected with stop valve B and B chamber, described tested dynamic pressure feedback servo valve (5)
A mouth be sequentially connected with shutoff valve C and C chamber, the B mouth of described tested dynamic pressure feedback servo valve (5) depends on
Secondary connection stop valve D and D chamber；
The described tested A mouth of dynamic pressure feedback servo valve (5) and the path of shutoff valve C are oil circuit a, described
The tested B mouth of dynamic pressure feedback servo valve (5) and the path of stop valve D are oil circuit b, described oil circuit a and
Stop valve H is connected between oil circuit b；Described oil circuit a is provided with the first pressure transducer, described oil circuit b
Being provided with the second pressure transducer, described feedback cavity A connects the 3rd pressure transducer, described feedback cavity B
Connecting the 4th pressure transducer, piston rod one end of described loading hydraulic cylinder (6) is sequentially connected with displacement sensing
Device and low pass filter, the piston rod other end connection speed sensor of described loading hydraulic cylinder (6)；Institute
State low pass filter, velocity sensor, the first pressure transducer, the second pressure transducer, the 3rd pressure
Sensor and the 4th pressure transducer connect computer respectively, and described computer is executed loading servo valve (7)
Increase control signal.
Described computer mainly include master controller (2), data collecting card (4), man machine interface (3) and
DA card (1)；Described low pass filter, velocity sensor, the first pressure transducer, the second pressure sensing
Device, the 3rd pressure transducer and the 4th pressure transducer are connected with described data collecting card (4) respectively, institute
State data collecting card (4) to be connected with master controller (2), described master controller (2) and man machine interface (3)
Connecting, described master controller (2) is connected with DA card (1), and described DA card (1) is to loading servo
Valve (7) applies control signal.
The test method of a kind of dynamic pressure feedback differential pressure characteristics test system, comprises the steps:
S1: open described stop valve A, stop valve B, shutoff valve C and stop valve D, described loading is watched
Take the A mouth of valve (7), B mouth and the A mouth of tested dynamic pressure feedback servo valve (5), B mouth respectively with add
Carrier fluid cylinder pressure (6) connects, and by the main valve plug dieback of tested dynamic pressure feedback servo valve (5), prevents it from coming
Return is dynamic, impact test；
S2: open described stop valve H, utilizes described computer to apply to control letter to loading servo valve (7)
Number, carry out position feedback by institute's low-pass filtered device of displacement sensors, to described loading hydraulic cylinder (6)
Enforcing location closed loop control, maintains the piston near middle position；
S3: close described stop valve H, utilizes described computer to apply to control letter to loading servo valve (7)
Number, carry out pressure feedback by pressure transducer, make tested dynamic pressure feedback servo valve (5) be in standard examination
Testing condition, regulation loads the input sine wave current amplitude size of servo valve (7), makes tested dynamic pressure feedback
Examination takes the amplitude that the load pressure reduction holding of valve (5) sets.In the frequency range of regulation, change different frequency
Rate, with the load pressure reduction of computer recording tested dynamic pressure feedback servo valve (5) and feedback pressure reduction, according to not
The amplitude of the dynamic pressure feedback pressure reduction △ Pd under same frequency draws dynamic pressure feedback differential pressure characteristics curve (such as Fig. 3).
Dynamic pressure feedback differential pressure characteristics curve is exactly dynamic pressure feedback two cavity pressure difference and passes through between charge valve power frequency
Relation.
Described standard test conditions tested dynamic pressure feedback servo valve (5) A, B two chamber load pressure reduction amplitude
For 8MPa.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and
It is not the restriction to embodiments of the present invention, for those of ordinary skill in the field,
Can also make other changes in different forms on the basis of described above, here cannot be to all
Embodiment give exhaustive, every belong to the obvious change that technical scheme extended out
Change or change the row still in protection scope of the present invention.
Claims (3)
1. a dynamic pressure feedback differential pressure characteristics test system, it is characterised in that it mainly includes loading servo
Valve (7), tested dynamic pressure feedback servo valve (5), loading hydraulic cylinder (6), computer, stop valve, pressure
Force transducer, displacement transducer, low pass filter and velocity sensor；
Described loading servo valve (7) includes A mouth, B mouth, oil-feed port P and oil return inlet T, described tested
Dynamic pressure feedback servo valve includes that (5) include A mouth, B mouth, oil-feed port P, oil return inlet T, feedback cavity A
With feedback cavity B, described pressure transducer include the first pressure transducer, the second pressure transducer, the 3rd
Pressure transducer and the 4th pressure transducer；Described loading hydraulic cylinder (6) includes A chamber, B chamber, C chamber
With D chamber；The A mouth of described loading servo valve (7) is sequentially connected with stop valve A and A chamber, described loading
The B mouth of servo valve (7) is sequentially connected with stop valve B and B chamber, described tested dynamic pressure feedback servo valve (5)
A mouth be sequentially connected with shutoff valve C and C chamber, the B mouth of described tested dynamic pressure feedback servo valve (5) depends on
Secondary connection stop valve D and D chamber；
The described tested A mouth of dynamic pressure feedback servo valve (5) and the path of shutoff valve C are oil circuit a, described
The tested B mouth of dynamic pressure feedback servo valve (5) and the path of stop valve D are oil circuit b, described oil circuit a and
Stop valve H is connected between oil circuit b；Described oil circuit a is provided with the first pressure transducer, described oil circuit b
Being provided with the second pressure transducer, described feedback cavity A connects the 3rd pressure transducer, described feedback cavity B
Connecting the 4th pressure transducer, piston rod one end of described loading hydraulic cylinder (6) is sequentially connected with displacement sensing
Device and low pass filter, the piston rod other end connection speed sensor of described loading hydraulic cylinder (6)；Institute
State low pass filter, velocity sensor, the first pressure transducer, the second pressure transducer, the 3rd pressure
Sensor and the 4th pressure transducer connect computer respectively, and described computer is executed loading servo valve (7)
Increase control signal.
Dynamic pressure feedback differential pressure characteristics the most according to claim 1 test system, it is characterised in that institute
State computer and mainly include master controller (2), data collecting card (4), man machine interface (3) and DA card
(1)；
Described low pass filter, velocity sensor, the first pressure transducer, the second pressure transducer,
Three pressure transducers and the 4th pressure transducer are connected with described data collecting card (4) respectively, described data
Capture card (4) is connected with master controller (2), and described master controller (2) is with man machine interface (3) even
Connecing, described master controller (2) is connected with DA card (1), and described DA card (1) is to loading servo valve
(7) control signal is applied.
3. the test of the dynamic pressure feedback differential pressure characteristics test system as described in claim 1 to 2 is arbitrary
Method, it is characterised in that comprise the steps:
S1: open described stop valve A, stop valve B, shutoff valve C and stop valve D, described loading is watched
Take the A mouth of valve (7), B mouth and the A mouth of tested dynamic pressure feedback servo valve (5), B mouth respectively with add
Carrier fluid cylinder pressure (6) connects, and by the main valve plug dieback of tested dynamic pressure feedback servo valve (5), prevents it from coming
Return is dynamic, impact test；
S2: open described stop valve H, utilizes described computer to apply to control letter to loading servo valve (7)
Number, carry out position feedback by institute's low-pass filtered device of displacement sensors, to described loading hydraulic cylinder (6)
Enforcing location closed loop control, maintains the piston near middle position；
S3: close described stop valve H, utilizes described computer to apply to control to loading servo valve (7)
Signal, carries out pressure feedback by pressure transducer, makes tested dynamic pressure feedback servo valve (5) be in standard
Experimental condition, regulation loads the input sine wave current amplitude size of servo valve (7), makes tested valve (5)
Load pressure reduction keep set amplitude.In the frequency range setting regulation, change different frequency, use tricks
Calculation machine records load pressure reduction and the feedback pressure reduction of tested dynamic pressure feedback servo valve (5), according under different frequency
The amplitude of dynamic pressure feedback pressure reduction △ Pd draw dynamic pressure feedback differential pressure characteristics curve.
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Cited By (1)
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|---|---|---|---|---|
| CN107831008A (en) * | 2017-12-14 | 2018-03-23 | 深圳市华迈环保有限公司 | A kind of water purifier dynamic pressure tester |
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Application publication date: 20160831 |