CN106089857B - The test system and test method of the dynamic pressure feedback effect frequency characteristic of servo valve - Google Patents
The test system and test method of the dynamic pressure feedback effect frequency characteristic of servo valve Download PDFInfo
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- CN106089857B CN106089857B CN201610446419.9A CN201610446419A CN106089857B CN 106089857 B CN106089857 B CN 106089857B CN 201610446419 A CN201610446419 A CN 201610446419A CN 106089857 B CN106089857 B CN 106089857B
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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
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Abstract
The embodiments of the invention provide the test system and test method of a kind of dynamic pressure feedback effect frequency characteristic of servo valve.The system includes：Load servo valve, subject dynamic pressure feedback servo valve, loading hydraulic cylinder, master controller, stop valve, displacement transducer, pressure sensor and velocity sensor；A, B chamber for loading servo valve are connected by stop valve A, B and loading hydraulic cylinder respectively, and master controller applies control signal to loading servo valve, and subject dynamic pressure feedback servo valve is loaded；The chamber of load two of subject dynamic pressure feedback servo valve connects pressure sensor 1 and pressure sensor 2 respectively, and two chambers of feedback connect the pressure sensor 3 and pressure sensor 4 respectively.The output signal of master controller collection displacement transducer, pressure sensor and velocity sensor, carries out data processing to output signal, obtains the dynamic pressure feedback effect frequency characteristic of servo valve.The present invention can real-time, quickly and accurately measure the dynamic pressure feedback effect frequency characteristic of servo valve.
Description
Technical field
The present invention relates to the dynamic pressure feedback effect frequency characteristic of servo valve control technical field, more particularly to a kind of servo valve
Test system and test method.
Background technology
In electrohydraulic servo-controlling system, core parts of the servo valve as system, electric part and hydraulic part are connected
Pick up and, the conversion and hydraulic pressure for realizing electro-hydraulic signal are amplified, 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, solves large inertia Low rigidity system because structure is brought
The problem of damping small, servo-control system stability difference, frequently with dynamic pressure feedback servo valve as control element.Dynamic pressure feedback is watched
Take the dynamic-pressure feedback network in valve and determine that it suppresses the ability of load pressure resonance.By the time constant for setting up dynamic pressure feedback
With feedback flow gain, dynamic pressure feedback rectification building-out is carried out to servo-drive system, system resistance can have both been effectively improved in dynamic
Buddhist nun, improves dynamic property, and and can keeps the rigidity of system in stable state, system is had good anti-loading interference performance.Cause
This, it is necessary to relatively accurately configuration feedback flow gain and time constant, whole test could be ensured while resonance is suppressed
The data qualifier of frequency range.
At present, dynamic pressure feedback characteristic test method is to carry out test step by step to the various characterisitic parameters of dynamic pressure feedback servo valve.
Wherein dynamic pressure feedback effect frequency characteristic is to carry out frequency sweep test to obtain dynamic characteristic of the load flow to load pressure difference change.For
Obtain the different qualities parameter of dynamic pressure feedback servo valve, prior art needs to change test fixture and again in test process
Test parameter is debugged, process is relatively complicated, and with the increase of product type and quantity, dynamic pressure feedback characteristic test has become shadow
Ring a key factor of production efficiency.And test process relies on manual pointwise test, artificial interpretation data, automaticity
Low, data cover face is narrow, and test accuracy is relatively low, it is impossible to completely real reflection dynamic pressure feedback characteristic.
The content of the invention
The embodiment provides a kind of test system of the dynamic pressure feedback effect frequency characteristic of servo valve and experiment
Method, to realize the dynamic pressure feedback effect frequency characteristic of Validity Test servo valve.
To achieve these goals, this invention takes following technical scheme.
According to an aspect of the present invention, a kind of measurement system of the dynamic pressure feedback effect frequency characteristic of servo valve is provided
System, including：Load servo valve, subject dynamic pressure feedback servo valve, loading hydraulic cylinder, master controller, stop valve, displacement transducer,
Pressure sensor and velocity sensor；
Described loading servo valve, its A, B chamber are connected by stop valve A, B with the loading hydraulic cylinder respectively, pass through institute
Master controller is stated to load the subject dynamic pressure feedback servo valve to loading servo valve application control signal；
Described subject dynamic pressure feedback servo valve, its A, B chamber are connected by the shutoff valve C, D and loading hydraulic cylinder respectively
Connect；It loads two chambers and connects pressure sensor 1 and pressure sensor 2 respectively, for measuring load pressure difference change；It feeds back two chambers
The pressure sensor 3 and pressure sensor 4 are connected respectively, for measuring feedback pressure difference change；
Described loading hydraulic cylinder, including piston rod, a displacement transducer is installed respectively at the both ends of the piston rod
With a velocity sensor, displacement transducer connects the master controller with velocity sensor；
Described master controller, connected with the loading servo valve, according to the instruction of test software, to the loading servo
Valve sends amplitude and frequency controlled loading signal, gathers the defeated of institute's displacement sensors, pressure sensor and velocity sensor
Go out signal, data processing is carried out to the output signal, obtains the dynamic pressure feedback effect frequency characteristic of the servo valve.
Further, described system also includes：
Data collecting card, it is attached with the pressure sensor, displacement transducer, velocity sensor and master controller,
The output signal of the pressure sensor, displacement transducer and velocity sensor is gathered, various biographies are carried out with the master controller
The data transmission of sensor signal, realize the closed-loop control to position and load pressure difference.
Further, described system includes multiple stop valves, by the stop valve being switched on or switched off in system, realizes not
With the switching between testing experiment project.
Further, described pressure sensor, for measure subject dynamic pressure feedback servo valve load both ends pressure difference and
The pressure difference at dynamic pressure feedback loop both ends；
Described displacement transducer, for the loading dynamic cylinder enforcing location closed-loop control, protecting the piston rod
Hold near middle position；
Described velocity sensor, for measuring the load flow of subject dynamic pressure feedback servo valve.
According to another aspect of the present invention, a kind of experiment side of the dynamic pressure feedback effect frequency characteristic of servo valve is provided
Method, applied to described system, including：
A displacement transducer and a velocity sensor are installed into the piston rod left and right ends of loading hydraulic cylinder respectively, will
A, B chamber of loading servo valve are connected by stop valve A, B with the loading hydraulic cylinder respectively, will be tested dynamic pressure feedback servo valve
A, B chambers are connected with the loading hydraulic cylinder by shutoff valve C, D, load two chambers and connect pressure sensor 1 and pressure respectively respectively
Sensor 2, two chambers of feedback connect pressure sensor 3 and pressure sensor 4 respectively；By master controller and it is described loading servo valve,
Displacement transducer, velocity sensor connection；
The master controller applies control signal to the loading servo valve, and the input for adjusting the loading servo valve is sinusoidal
Ripple current amplitude size, the load pressure difference of the subject dynamic pressure feedback servo valve is set to keep regulation amplitude；The master controller is adopted
Collect the output signal of institute's displacement sensors, pressure sensor and velocity sensor, data processing carried out to the output signal,
Obtain the dynamic pressure feedback effect frequency characteristic of the servo valve.
Further, described method also includes：
Data collecting card and the pressure sensor, displacement transducer, velocity sensor and master controller are attached,
The data collecting card gathers the output signal of the pressure sensor, displacement transducer and velocity sensor, with the master control
Device processed carries out the data transmission of various sensor signals；
The pressure sensor 1 and pressure sensor 2 measure the load pressure difference change of the subject dynamic pressure feedback servo valve,
The pressure sensor 3 and pressure sensor 4 measure the feedback pressure difference change of the subject dynamic pressure feedback servo valve.
Further, described displacement transducer makes the piston to the loading dynamic cylinder enforcing location closed-loop control
Bar is maintained near middle position；The load flow of described velocity sensor measurement subject dynamic pressure feedback servo valve.
Further, described method also includes：
During static test, corresponding stop valve is opened, master controller applies control to loading servo valve, utilizes displacement sensing
Device and low pass filter maintain the piston near middle position to loading hydraulic cylinder enforcing location closed-loop control, are tested dynamic pressure feedback
Servo valve is in zero-bit state and is easy to establish load pressure difference；Corresponding stop valve is turned off, using master controller to loading
Servo valve applies control signal, subject dynamic pressure feedback servo valve is loaded the pressure difference amplitude of two chambers and reaches related specifications requirement.
Further, described method also includes：
When dynamic is tested, break position closed loop using the effect of low pass filter, the servo valve impression of subject dynamic pressure feedback is negative
Carry the change of pressure difference and produce load output flow, cause the reciprocating motion of piston, it is anti-using the output amplitude of velocity sensor
Reflect the size of load output flow；
Sweep check is being carried out as defined in related specifications in frequency range by 0.1Hz of step-length since 0.1Hz, is using master control
The output signal of device collection pressure sensor and velocity sensor processed is simultaneously post-processed, and obtains being tested dynamic pressure feedback servo valve
Dynamic pressure feedback effect frequency characteristic, parse the dynamic pressure feedback effect frequency characteristic and obtain dynamic pressure feedback initial frequency
ωq, dynamic pressure feedback starting decibel Lq, dynamic pressure feedback peak value decibel Lf, dynamic pressure feedback saturation frequency ωf, dynamic pressure feedback time constant
τ。
The dynamic pressure of the servo valve of the embodiment of the present invention it can be seen from the technical scheme provided by embodiments of the invention described above
The automatic measuring system of feedback characteristics is to improving the test accuracy of servo valve dynamic-pressure feedback network relevant parameter, high efficiency has
It is of great significance.
The additional aspect of the present invention and advantage will be set forth in part in the description, and these will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill of field, without having to pay creative labor, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of dynamic pressure feedback effect frequency characteristic schematic diagram of servo valve provided in an embodiment of the present invention；
Fig. 2 is a kind of dynamic pressure feedback characteristic test structure chart of servo valve provided in an embodiment of the present invention
Fig. 3 is a kind of dynamic pressure feedback effect frequency characteristic test test structure of servo valve provided in an embodiment of the present invention
Figure；
In figure：
The data collecting card 5. of 2. master controller of 1.DA cards, 3. man-machine interface 4. subject dynamic pressure feedback servo valve 6. loads
Hydraulic cylinder 7. loads servo valve.
Embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is individual ", " described " and "the" may also comprise plural form.It is to be further understood that what is used in the specification of the present invention arranges
Diction " comprising " refer to the feature, integer, step, operation, element and/or component be present, but it is not excluded that in the presence of or addition
One or more other features, integer, step, operation, element, component and/or their groups.It should be understood that when we claim member
Part is " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " can include wireless connection or coupling.Wording used herein
"and/or" includes any cell of one or more associated list items and all combined.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology) with the general understanding identical meaning with the those of ordinary skill in art of the present invention.Should also
Understand, those terms defined in such as general dictionary, which should be understood that, to be had and the meaning in the context of prior art
The consistent meaning of justice, and unless defined as here, will not be with idealizing or the implication of overly formal be explained.
For ease of the understanding to the embodiment of the present invention, done further by taking several specific embodiments as an example below in conjunction with accompanying drawing
Explanation, and each embodiment does not form the restriction to the embodiment of the present invention.
The embodiment of the present invention is directed to the deficiency of existing measuring technology, develop it is a kind of using electrohydraulic servo valve, loading hydraulic cylinder,
Master controller, data collecting card, sensor and test software, realize master controller automatic test dynamic pressure feedback effect frequency
The test method of characteristic.
A kind of measuring system of the dynamic pressure feedback effect frequency characteristic of servo valve provided in an embodiment of the present invention includes loading
Servo valve, subject dynamic pressure feedback servo valve, loading hydraulic cylinder, master controller, data collecting card, stop valve, pressure sensor, position
Displacement sensor and velocity sensor etc..
The loading servo valve, to simulate the fluctuation of load of large inertia controlled device, using a special loading servo
Valve is loaded for subject dynamic pressure feedback servo valve.Servo valve A, B chamber are loaded respectively by described stop valve A, B and loading hydraulic pressure
Cylinder is connected, and pressure feedback is carried out using pressure sensor 1 and pressure sensor 2, is applied by master controller to loading servo valve
Control signal, the input sine wave current amplitude size of regulation loading servo valve, so that subject dynamic pressure feedback servo valve is negative
Carry pressure difference (it is poor to be tested servo valve two cavity pressures of A, B) and keep regulation amplitude.
Described subject dynamic pressure feedback servo valve, its A, B chamber are connected by the shutoff valve C, D and loading hydraulic cylinder respectively
Connect, it loads two chambers and connects pressure sensor 1 and pressure sensor 2 respectively, and for measuring load pressure difference change, it feeds back two chambers
Pressure sensor 3 and pressure sensor 4 are connected respectively, for measuring feedback pressure difference change.In testing experiment, it is necessary to subject
Dynamic pressure feedback servo valve fuel feeding, but need not be powered.
The loading hydraulic cylinder, it is the basic machine of measuring system.One displacement is installed respectively and passed in piston rod left and right ends
Sensor and a velocity sensor.
The master controller, according to the instruction of test software, amplitude and frequency are sent from master controller to loading servo valve
Controlled loading signal, the output signal of pressure sensor, displacement transducer and velocity sensor is gathered by data collecting card,
Data processing is carried out by test software and draws test curve.
The data collecting card, connected with the pressure sensor, displacement transducer, velocity sensor and master controller
Connect, gather the output signal of the pressure sensor, displacement transducer and velocity sensor, various sensings are carried out with master controller
The data transmission of device signal, realize the closed-loop control to position and load pressure difference.
The stop valve, pass through the stop valve being switched on or switched off in system, it is possible to achieve between different testing experiment projects
Switching.
The pressure sensor, for measuring pressure difference and the dynamic pressure feedback loop at subject dynamic pressure feedback servo valve load both ends
The pressure difference at both ends；Displacement transducer, to loading dynamic cylinder enforcing location closed-loop control, maintain the piston near middle position；Speed
Sensor, for measuring the load flow of subject dynamic pressure feedback servo valve.
Dynamic pressure feedback characteristic test principle is as shown in Figure 2.During static test, stop valve H, stop valve H and other sections are opened
Only valve is all the same plays a part of opening or closing the oil circuit in oil circuit.Master controller applies control to loading servo valve,
Using displacement transducer and low pass filter to loading hydraulic cylinder enforcing location closed-loop control, maintain the piston near middle position,
Subject dynamic pressure feedback servo valve is in zero-bit state and is easy to establish load pressure difference.Stop valve H is turned off, is added using master controller pair
Carry servo valve (3) and apply control signal, subject dynamic pressure feedback servo valve (2) is loaded the pressure difference amplitude of two chambers and reach related specifications
It is required that.
When dynamic is tested, break position closed loop, subject dynamic pressure feedback servo valve (2) impression using the effect of low pass filter
Load the change of pressure difference and produce load output flow, cause the reciprocating motion of piston, utilize the output amplitude of velocity sensor
The size of reflection load output flow.
The method of testing of the dynamic pressure feedback effect frequency characteristic of servo valve provided in an embodiment of the present invention includes：
Sweep check is being carried out as defined in related specifications in frequency range by 0.1Hz of step-length since 0.1Hz, is using master control
The output signal of device collection pressure sensor and velocity sensor processed is simultaneously post-processed, and obtains being tested dynamic pressure feedback servo valve
Dynamic pressure feedback effect frequency characteristic, check in dynamic pressure feedback initial frequency ωq, dynamic pressure feedback starting decibel Lq, dynamic pressure feedback peak
It is worth decibel Lf, dynamic pressure feedback saturation frequency ωf, dynamic pressure feedback timeconstantτ.A kind of servo valve provided in an embodiment of the present invention
Dynamic pressure feedback effect frequency characteristic test curve is as shown in Figure 1.
According to the definition of dynamic pressure feedback characteristic, i.e. the dynamic change of load pressure causes servo by the effect of dynamic pressure feedback
The dynamic response characteristic of valve output loading changes in flow rate, measuring technology provided in an embodiment of the present invention to simulate dynamic pressure feedback completely
Application of the servo valve on servo control mechanism realizes load flow to the direct of load pressure difference change dynamic characteristic to develop starting point
Test.
Fig. 3 be a kind of servo valve provided in an embodiment of the present invention dynamic pressure feedback characteristic test structure chart, by connect or
Stop valve in disconnection system, it is possible to achieve the switching between different testing experiment projects, complete dynamic pressure feedback differential pressure characteristics, feedback
Pressure difference-quiescent flow characteristic and the experiment of dynamic pressure feedback effect frequency characteristic test.The measuring system is mainly by loading servo valve
(7) dynamic pressure feedback servo valve (5), loading hydraulic cylinder (6), master controller (2), data collecting card (4), stop valve, throttling, are tested
Valve, pressure sensor, displacement transducer, velocity sensor etc. form.
When carrying out " experiment of dynamic pressure feedback effect frequency characteristic test ", " throttle valve A " is closed, while by " stop valve
A ", " stop valve B ", " shutoff valve C " and " stop valve D " is opened, will " stop valve E ", " stop valve F " and " stop valve G " closings.I.e.
Can simplification figure 2, obtain the dynamic pressure feedback effect frequency characteristic test structure chart of the servo valve shown in Fig. 3.
When carrying out the experiment of dynamic pressure feedback effect frequency characteristic test, load A, B chamber of servo valve respectively with loading hydraulic cylinder
(6) A, B chamber connection, and be tested C, D chamber of A, B chamber of dynamic pressure feedback servo valve (5) respectively with loading hydraulic cylinder (6) and be connected,
Control signal is applied to loading servo valve (7) by master controller (2), pressure sensor and velocity pick-up are gathered with master controller
The output signal of device is simultaneously post-processed, and obtains being tested the dynamic pressure feedback effect frequency characteristic of dynamic pressure feedback servo valve.Tool
Body experimental procedure is as follows：
1) throttle valve A is closed, opens stop valve A, B, C, D, closes stop valve E, F, G.Now the A of loading hydraulic cylinder (6),
A, B chamber of the B chambers respectively with loading servo valve (7) is connected, and C, D chamber of loading hydraulic cylinder (6) are respectively with being tested dynamic pressure feedback servo
A, B chamber of valve (5) are connected.This experiment is dynamic frequency sweep test.
2) control signal is applied to loading servo valve (7) using master controller (2), using displacement transducer to loading hydraulic pressure
Cylinder (6) enforcing location closed-loop control, is maintained the piston near middle position.
3) sweep check is being carried out as defined in related specifications in frequency range by 0.1Hz of step-length since 0.1Hz, with master
Controller master controller (2) gathers the output signal of pressure sensor and velocity sensor and post-processed, and it is dynamic to obtain subject
The dynamic pressure feedback effect frequency characteristic of feedback servo valve (5) is pressed, checks in dynamic pressure feedback initial frequency ωq, dynamic pressure feedback rise
Beginning decibel Lq, dynamic pressure feedback peak value decibel Lf, dynamic pressure feedback saturation frequency ωf, dynamic pressure feedback timeconstantτ.Wherein utilize displacement
For sensor to loading hydraulic cylinder (6) enforcing location closed-loop control, velocity sensor is used to measuring load flow, velocity sensor and
Displacement transducer will carry out seal operation when mounted.Finally give dynamic characteristic of the load flow to load pressure difference change.
In summary, the automatic measuring system of the dynamic pressure feedback characteristic of the servo valve of the embodiment of the present invention is to improving servo
The test accuracy of valve dynamic-pressure feedback network relevant parameter, high efficiency tool are of great significance.
The dynamic pressure feedback effect frequency characteristic test test method of current servo valve mainly relies on manual pointwise test, people
Work interpretation data, automaticity is low, and data cover face is narrow, and test accuracy is relatively low, it is impossible to which completely real reflection dynamic pressure is anti-
Present characteristic.The invention provides the dynamic pressure feedback effect frequency characteristics measurement system and test method of a kind of servo valve, Neng Goushi
When, quickly and accurately measure servo valve dynamic pressure feedback effect frequency characteristic.
One of ordinary skill in the art will appreciate that：Accompanying drawing is the schematic diagram of one embodiment, module in accompanying drawing or
Flow is not necessarily implemented necessary to the present invention.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.Especially for device or
For system embodiment, because it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to method
The part explanation of embodiment.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit that separating component illustrates can be or may not be it is physically separate, can be as the part that unit is shown or
Person may not be physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can root
Factually border needs to select some or all of module therein realize the purpose of this embodiment scheme.Ordinary skill
Personnel are without creative efforts, you can to understand and implement.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (8)
- A kind of 1. measuring system of the dynamic pressure feedback effect frequency characteristic of servo valve, it is characterised in that including：Loading servo valve, It is tested dynamic pressure feedback servo valve, loading hydraulic cylinder, master controller, stop valve, displacement transducer, pressure sensor and velocity pick-up Device；Described loading servo valve, its A, B chamber are connected by stop valve A, B with the loading hydraulic cylinder respectively, pass through the master Controller applies control signal to loading servo valve and the subject dynamic pressure feedback servo valve is loaded；Described subject dynamic pressure feedback servo valve, its A, B chamber are connected by shutoff valve C, D and loading hydraulic cylinder respectively；It is loaded Two chambers connect pressure sensor one and pressure sensor two respectively, for measuring load pressure difference change；It feeds back two chambers and connected respectively Pressure sensor three and pressure sensor four are connect, for measuring feedback pressure difference change；Described loading hydraulic cylinder, including piston rod, a displacement transducer and one are installed respectively at the both ends of the piston rod Individual velocity sensor, displacement transducer and velocity sensor connect the master controller；Described master controller, connected with the loading servo valve, according to the instruction of test software, to the loading servo valve hair Go out amplitude and frequency controlled loading signal, the output letter of collection institute displacement sensors, pressure sensor and velocity sensor Number, data processing is carried out to the output signal, the dynamic pressure feedback effect frequency for obtaining the subject dynamic pressure feedback servo valve is special Property；Data collecting card, it is attached, gathers with the pressure sensor, displacement transducer, velocity sensor and master controller The output signal of the pressure sensor, displacement transducer and velocity sensor, various sensors are carried out with the master controller The data transmission of signal, realize the closed-loop control to position and load pressure difference.
- 2. measuring system according to claim 1, it is characterised in that described system includes multiple stop valves, by connecing Stop valve in on-off open system, realize the switching between different testing experiment projects.
- 3. according to the measuring system described in any one of claim 1 to 2, it is characterised in that described pressure sensor, for surveying The pressure difference at amount subject dynamic pressure feedback servo valve load both ends and the pressure difference at dynamic pressure feedback loop both ends；Described displacement transducer, for the loading hydraulic cylinder enforcing location closed-loop control, being maintained at the piston rod Near middle position；Described velocity sensor, for measuring the load flow of subject dynamic pressure feedback servo valve.
- A kind of 4. test method of the dynamic pressure feedback effect frequency characteristic of servo valve, applied to described in any one of claims 1 to 3 Measuring system, it is characterised in that including：A displacement transducer and a velocity sensor are installed into the piston rod left and right ends of loading hydraulic cylinder respectively, will be loaded A, B chamber of servo valve are connected by stop valve A, B with the loading hydraulic cylinder respectively, will be tested A, B of dynamic pressure feedback servo valve Chamber is connected by shutoff valve C, D with the loading hydraulic cylinder respectively, loads two chambers connects pressure sensor one and pressure passes respectively Sensor two, two chambers of feedback connect pressure sensor three and pressure sensor four respectively；By master controller and it is described loading servo valve, Displacement transducer, velocity sensor connection；The master controller applies control signal to the loading servo valve, adjusts the input sine wave electricity of the loading servo valve Amplitude size is flowed, the load pressure difference of the subject dynamic pressure feedback servo valve is kept regulation amplitude；The master controller gathers institute The output signal of displacement sensors, pressure sensor and velocity sensor, data processing is carried out to the output signal, obtained The dynamic pressure feedback effect frequency characteristic of the subject dynamic pressure feedback servo valve；Data collecting card and the pressure sensor, displacement transducer, velocity sensor and master controller are attached, it is described Data collecting card gathers the output signal of the pressure sensor, displacement transducer and velocity sensor, with the master controller Carry out the data transmission of various sensor signals.
- 5. according to the method for claim 4, it is characterised in that described method also includes：The pressure sensor one and pressure sensor two measure the load pressure difference change of the subject dynamic pressure feedback servo valve, institute State pressure sensor three and pressure sensor four measures the feedback pressure difference change of the subject dynamic pressure feedback servo valve.
- 6. according to the method for claim 4, it is characterised in that described displacement transducer is implemented to the loading hydraulic cylinder Position-force control, the piston rod is set to be maintained near middle position；Described velocity sensor measurement subject dynamic pressure feedback servo The load flow of valve.
- 7. according to the method described in claim 4 or 5 or 6, it is characterised in that described method also includes：During static test, open corresponding stop valve, master controller applies control to loading servo valve, using displacement transducer and Low pass filter maintains the piston near middle position to loading hydraulic cylinder enforcing location closed-loop control, is tested dynamic pressure feedback servo Valve is in zero-bit state and is easy to establish load pressure difference；Corresponding stop valve is turned off, using master controller to loading servo Valve applies control signal, subject dynamic pressure feedback servo valve is loaded the pressure difference amplitude of two chambers and reaches related specifications requirement.
- 8. according to the method for claim 7, it is characterised in that described method also includes：When dynamic is tested, break position closed loop, subject dynamic pressure feedback servo valve impression load pressure using the effect of low pass filter The change of difference and produce load output flow, cause the reciprocating motion of piston, reflected using the output amplitude of velocity sensor negative Carry the size of output flow；Sweep check is being carried out as defined in related specifications in frequency range by 0.1Hz of step-length since 0.1Hz, is using master controller The output signal of collection pressure sensor and velocity sensor is simultaneously post-processed, and obtains being tested the dynamic pressure of dynamic pressure feedback servo valve Feedback effect frequency characteristic, parse the dynamic pressure feedback effect frequency characteristic and obtain dynamic pressure feedback initial frequency ωq、 Dynamic pressure feedback starting decibel Lq, dynamic pressure feedback peak value decibel Lf, dynamic pressure feedback saturation frequency ωf, dynamic pressure feedback timeconstantτ.
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| CN105909597B (en) * | 2016-06-21 | 2017-09-29 | 北京交通大学 | Dynamic pressure feedback pressure difference-quiescent flow characteristic test system and test method |
| CN105909596A (en) * | 2016-06-21 | 2016-08-31 | 北京交通大学 | Dynamic pressure feedback pressure difference characteristic test system and test method |
| CN111008118A (en) * | 2019-12-03 | 2020-04-14 | 中国运载火箭技术研究院 | Servo system energy consumption evaluation system and evaluation method |
| CN112540631A (en) * | 2020-11-30 | 2021-03-23 | 武汉市天毅达测控科技有限公司 | Pressure controller |
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| CN105605032A (en) * | 2014-10-30 | 2016-05-25 | 北京精密机电控制设备研究所 | Dynamic loading device for dynamic pressure feedback test of servo valve |
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| CN105605032A (en) * | 2014-10-30 | 2016-05-25 | 北京精密机电控制设备研究所 | Dynamic loading device for dynamic pressure feedback test of servo valve |
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