CN102287419B - Device and method for automatically testing performance of steering engine servo valve - Google Patents
Device and method for automatically testing performance of steering engine servo valve Download PDFInfo
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Abstract
The invention discloses a device and a method for automatically testing the performance of a steering engine servo valve. The device comprises a tested steering engine, a hydraulic system and a circuit system, and is characterized in that: the hydraulic system consists of a hydraulic source, a steering engine oil supply oil way, a steering engine balancing valve oil supply oil way and an oil return oil way; in the circuit system, a digital/analog (D/A) analog output board card and a voltage/current (V/I) conversion isolating amplifier are arranged on a servo valve current control circuit of the tested steering engine; a displacement sensor is arranged at an output end of an electro-hydraulic steering engine power piston; and during test, control software of a measurement and control computer outputs current to the servo valve through the D/A analog output board card and the V/I conversion isolating amplifier according to a control rule determined by the selected testing items, controls movement of the power piston, acquires displacement of the power piston, records control voltage of the servo valve current, movement time of the power piston and other data, and processes and computes the data so as to automatically determine whether the performance of the servo valve meets requirements of related indexes. The device has high testing degree of automation, high precision and good application and popularization prospects.
Description
Technical field:
The present invention relates to steering wheel Testing Performances of Hydraulic Servo Valve technical field, is a kind of steering wheel servovalve performance automatic test method specifically.
Background technique:
Electro-hydraulic actuator is one of important component part of present generation aircraft and helicopter control system, is the actuator of gyropilot, plays a part electric liquid conversion and amplifies with hydraulic pressure.Servovalve is one of core component of steering wheel, and it is a kind of electro-hydraulic converting element, is again a kind of power amplification element.Servovalve is the precise part of machinery, electronics and the combination of hydraulics height, and it combines the feature of electricity and hydraulic pressure two aspects, have that control accuracy is high, fast response time, signal are processed flexibly, output power greatly and the advantage such as compact structure.The quality of servovalve performance directly has influence on precision, stability and the reliability of aircraft and helicopter control system.
Due to the high-accuracy property of servovalve, with and key position in steering wheel and even whole control system, the test of servovalve for ensure the performance index of servovalve and ensure steering wheel accurately, acceleration, stable work be all significant.In the regular inspection and maintenance process of steering wheel, all need its servovalve strictly to test, whether check feature reaches the requirement of related index.
The test event of steering wheel servovalve is larger at steering wheel test event proportion, conventional test methodologies is to adopt external servovalve current load device, pass through manual tune, control loading direction and the size of servovalve electric current, in test process, according to test request, by slow circumvolve " adjusting of servovalve electric current " knob with stir " servovalve commutation " switch, control the loading of servovalve electric current, and the displacement of measuring steering wheel power piston by dial gauge, adopt stopwatch to carry out timing for the test event that needs timing, determine the properties of steering wheel servovalve by this manual test method.This traditional test method automaticity is not high, efficiency is low, testing precision is poor, the loading velocity of electric current has affected the accuracy of test result largely in addition, and testing precision depends on tester's professional skill and test experience largely.
Summary of the invention:
The object of the invention is to overcome the deficiency of above-mentioned prior art, and a kind of automatic testing device of servo valve performance of steering engine is provided.
Another object of the present invention is to provide a kind of steering wheel servovalve performance automatic test method.
The present invention has mainly solved existing manual test method and has determined that the properties automaticity of steering wheel servovalve is not high, efficiency is low, testing precision is poor, the loading velocity of electric current has affected the accuracy of test result largely in addition, and testing precision depends on tester's the problem such as professional skill and test experience largely.
To achieve these goals, the present invention adopts following technological scheme: a kind of automatic testing device of servo valve performance of steering engine, it comprises tested steering wheel, hydraulic system and circuitry, and its special way is that hydraulic system is made up of hydraulic power, steering wheel oil feeding line, steering wheel trim valve oil feeding line, oil return circuit; Circuitry is that V/I conversion isolated amplifier and D/A analog output card are installed on the current control circuit of tested steering wheel servovalve, to replace the manual regulating current device of traditional servovalve; At the output terminal installation position displacement sensor of the power piston of steering wheel, to replace traditional dial gauge, displacement transducer is connected with A/D capture card, D/A analog output card is connected with Measurement &control computer respectively with A/D capture card, preset control software in Measurement &control computer, carries out data processing and result shows and stores by Measurement &control computer.
Above-mentioned V/I conversion isolated amplifier can be realized conversion, isolation and the amplification of input control voltage signal and output current signal; The size of output current is only relevant with control voltage, and with irrelevant with load, irrelevant with servovalve coil resistance, only relevant with input control voltage signal, allow loading coil resistance to fluctuate within the specific limits, and the size of output current and the size of input control voltage linear; V/I conversion isolated amplifier can be realized ambipolar input and output, and the polarity of output current is identical with the polarity of input control voltage.
A kind of automatic testing device of servo valve performance of steering engine of the present invention, adopts and controls software self-clocking for the test event that needs timing, to replace traditional stopwatch manual time keeping.
A kind of automatic testing device of servo valve performance of steering engine of the present invention, the hydraulic power of the hydraulic system described in it comprises hydraulic oil container, low pressure oil filter, oil hydraulic pump, motor, relief valve, accumulator, one-way valve, high pressure oil filter; Steering wheel oil feeding line comprises steering wheel fuel feeding reduction valve, steering wheel fuel feeding throttle valve and steering wheel charge oil pressure table; Steering wheel trim valve oil feeding line comprises steering wheel trim valve fuel feeding reduction valve, steering wheel trim valve fuel feeding throttle valve and steering wheel trim valve charge oil pressure table; Oil return circuit comprises return pressure table and the filter of oil return oil.
Device of the present invention is to steering wheel servovalve performance automatic test method, and its special way is to comprise the steps:
Before a test, need the D/A analog output card in device and V/I conversion isolated amplifier to proofread and correct, when test, pass through D/A analog output card output voltage control signal by the control software in Measurement &control computer, this voltage control signal is changed isolated amplifier by V/I and is converted corresponding current signal to, send into the servovalve of tested steering wheel, control moving up and down of steering wheel power piston;
The displacement of b power piston converts voltage signal to by displacement transducer and passes to A/D capture card, and the signal of collection is flowed to Measurement &control computer by A/D capture card;
C Measurement &control computer records the control voltage data of servovalve electric current simultaneously, the displacement data of power piston, the run duration data of power piston, then carry out data processing and calculating according to test data, thereby automatically determine the stationarity of servovalve, polarity, displacement and the drift value of power piston when servovalve loads just/back current and electric current and makes zero, the displacement of power piston under overload signal, power piston just/reversing motion inrush current, power piston is moved to the time of limit inferior by limes superiors, power piston is moved to the time of limes superiors by limit inferior, the time difference of moving between power piston high-low limit, finally processing result shown and store.
Steering wheel servovalve performance automatic test method of the present invention, there is some difference when test, to allow the servovalve coil resistance of different tested steering wheels, and its resistance can fluctuate in the scope of nominal value upper and lower 20%.
Compared with the prior art a kind of automatic testing device of servo valve performance of steering engine of the present invention and test method have outstanding substantive distinguishing features and remarkable progress: 1, adopt V/I conversion isolated amplifier, output current is only relevant with control voltage, and it is irrelevant with loading coil resistance, allow loading coil resistance to fluctuate within the specific limits, V/I conversion isolated amplifier still can ensure linear output; 2, adopt and control software by the adjusting of D/A analog output card and V/I conversion isolated amplifier control servovalve electric current, solved the problem that in traditional-handwork test, current load step-length and loading rule vary with each individual; 3, adopt the displacement of displacement sensor steering wheel power piston, solved in traditional-handwork test and adopted dial gauge measurement displacement easily to occur human error, the problem that reading error is large; 4, adopt and control software self-clocking, motion timing is completed by the nonsynchronous timer in CVI software, has solved and in traditional test, has adopted artificial start and stop manual time-keeping easily to occur human error, the problem that timing error is large; 5, can realize in steering wheel test and the automatic test of servovalve dependence test project, demonstration and the storage of test result, and test the prompting of overproof project, can increase substantially automaticity, the testing efficiency of servovalve test, reduce the degree of dependence of steering wheel Testing Performances of Hydraulic Servo Valve to tester's professional skill and test experience simultaneously, increased substantially precision and the degree of accuracy of test.
Brief description of the drawings:
Fig. 1 is test philosophy block diagram of the present invention;
Fig. 2 is hydraulic system principle figure of the present invention;
Fig. 3 is servovalve stationarity test flow chart;
Fig. 4 is servovalve polarity test flow chart;
Drift value test flow chart when the displacement of power piston and electric current make zero when Fig. 5 is servovalve loading forward current;
The displacement measurement flow chart of power piston when Fig. 6 is servovalve loading overload signal;
Fig. 7 is the test flow chart of power piston positive movement inrush current;
Fig. 8 is power piston is moved to limit inferior time test flow chart by limes superiors.
Embodiment:
For Comprehension and Implementation better, below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail.
Embodiment 1, referring to Fig. 1,2, taking YD-4 type steering wheel servovalve performance automatic test as example, selects tested steering wheel 12, then connecting fluid pressing system and circuitry;
Hydraulic system is made up of hydraulic power, steering wheel oil feeding line, steering wheel trim valve oil feeding line, oil return circuit; Hydraulic power comprises hydraulic oil container 1, low pressure oil filter 2, oil hydraulic pump 3, motor 4, relief valve 5, accumulator 6, one-way valve 7, high pressure oil filter 8; Steering wheel oil feeding line comprises steering wheel fuel feeding reduction valve 9, steering wheel fuel feeding throttle valve 10 and steering wheel charge oil pressure table 11; Steering wheel trim valve oil feeding line comprises steering wheel trim valve fuel feeding reduction valve 13, steering wheel trim valve fuel feeding throttle valve 14 and steering wheel trim valve charge oil pressure table 15; Oil return circuit comprises return pressure table 16 and oil return oil filter 17; Hydraulic oil container 1 is connected with oil feeding line low pressure oil filter 2, oil feeding line low pressure oil filter 2 is connected with oil hydraulic pump 3, oil hydraulic pump 3 is connected with motor 4, relief valve 5, accumulator 6, one-way valve 7 respectively, one-way valve 7 is connected successively with oil feeding line high pressure oil filter 8, steering wheel oil feeding line reduction valve 9, steering wheel oil feeding line throttle valve 10 and steering wheel oil feeding line pressure gauge 11, and steering wheel oil feeding line pressure gauge 11 is connected with tested steering wheel 12; Tested steering wheel 12 is connected with steering wheel oil feeding line by steering wheel trim valve oil feeding line pressure gauge 15, steering wheel trim valve oil feeding line throttle valve 14, steering wheel trim valve oil feeding line reduction valve 13 successively; Tested steering wheel 12 is connected with hydraulic oil container 1 with oil return circuit oil filter 17 by oil return circuit pressure gauge 16;
Circuitry is that V/I conversion isolated amplifier 19 and D/A analog output card 20 are installed on the current control circuit of tested steering wheel servovalve 18, at the output terminal 21 installation position displacement sensors 22 of the power piston of steering wheel 12, displacement transducer 22 is connected with A/D capture card 23, D/A analog output card 20 is connected with Measurement &control computer 24 respectively with A/D capture card 23, the interior preset control software of Measurement &control computer 24, carries out data processing and result shows and stores by Measurement &control computer 24; For the test event that needs timing, the self-clocking of the interior preset control software of Measurement &control computer 7;
More than connect to form automatic testing device of servo valve performance of steering engine of the present invention.
Automatic testing device of servo valve performance of steering engine of the present invention, its automatic test approach is as follows: before test, need the D/A analog output card in device and V/I conversion isolated amplifier to proofread and correct; There is some difference when test, to allow the servovalve coil resistance of different tested steering wheels, and its resistance can fluctuate in the scope of nominal value upper and lower 20%; When test, automatically pass through D/A analog output card output voltage control signal (output voltage-5V～+ 5V) according to current selected test event with the control law of determining by the control software in Measurement &control computer, then change isolated amplifier by V/I and be converted to corresponding current signal (output current-5mA～+ 5mA) by controlling voltage signal, the loading step-length of servovalve electric current is determined according to test event, is conventionally no more than 10% of servovalve current load scope; Send into again the servovalve of tested steering wheel, control moving up and down of steering wheel power piston; The displacement of power piston is converted to the voltage signal of 0～+ 5V by displacement transducer, and passes to A/D capture card, is sent into the A/D modular converter of Measurement &control computer by A/D capture card;
Power piston is moved to the time of limit inferior by limes superiors, power piston is moved to the test events such as the time of limes superiors timework by limit inferior is completed automatically by the TT&C software of Measurement &control computer; TT&C software adopts the LabWindows/CVI of the America NI company virtual instrument software based on C language to design and develop, and TT&C software uses the nonsynchronous timer in CVI software, completes the work of the acquisition interval Δ t of timing in test process and specified data; Then carry out data processing and calculating according to test data by Measurement &control computer, thereby automatically determine stationarity, the polarity of servovalve, displacement and the drift value of power piston when servovalve loads just/back current and electric current and makes zero, the displacement of power piston under overload signal, power piston just/reversing motion inrush current, power piston is moved to the time of limit inferior by limes superiors, power piston is moved to the time of limes superiors by limit inferior, the time difference of moving between power piston high-low limit, finally processing result shown and store.
YD-4 type steering wheel servovalve stationarity testing process as shown in Figure 3.
Specifically comprise the following steps:
(1) click " test automatically " button on virtual test panel, start test;
(2) measurement and control program is powered to servovalve by D/A output card and V/I conversion isolated amplifier, and progressively loads servovalve electric current to+4mA, then progressively loads servovalve electric current to 0mA, and the current load step delta I of this test method gets 0.5mA conventionally;
(3) stablize after 3 seconds, automatically gather the displacement of No. 10 power pistons by displacement transducer and A/D capture card, this test method data capture interval of delta t is got 0.1S;
(4) test program is according to the displacement gathering, and whether automatic decision power piston is stable.Criterion is 10 maximum value S in shift value
maxwith minimum value S
minpoor | S
max-S
min| S compares with stability criterion Δ, and this test method stability criterion Δ S gets 0.1mm (calculate according to the linearity of the resolution of capture card and displacement transducer, and suitably amplify), if | S
max-S
min| < Δ S, thinks that power piston is stable; Otherwise, think that power piston is unstable.If stable, 10 shift values are adopted anti-Flutter mean value method to carry out the shift value that obtains after the digital filtering S at zero point as power piston
0; If unstable, the zero displacement point S using maximum forward position as power piston
0;
(5) output servovalve electric current-0.5mA, stablized after 3 seconds, stopped powering to servovalve;
(6) stablize after 3 seconds, automatically gather the current displacement S of power piston by displacement transducer and A/D capture card
1;
(7) the maximum drift amount S=|S of calculating power piston
1-S
0|, maximum drift amount should not exceed 0.25mm, judges that whether it meets the demands, and shows test results.
Under test inverse current polarity condition, when servovalve stationarity, test process and said process are similar, are that servovalve current load polarity is contrary.
YD-4 type steering wheel servovalve polarity test flow process as shown in Figure 4.
Specifically comprise the following steps:
(1) click " test automatically " button on virtual test panel, start test;
(2) measurement and control program, by D/A output card and V/I conversion isolated amplifier to the servovalve 0mA that powers, gathers the current displacement S of power piston automatically by displacement transducer and A/D capture card
0;
(3) progressively load servovalve electric current to+2mA (current load is progressively loading, and loading method is with the current load method in accompanying drawing 4), automatically gather the current displacement S of power piston by displacement transducer and A/D capture card
1;
(4) progressively load servovalve electric current to+4mA (current load is progressively loading, and loading method is with the current load method in accompanying drawing 4), automatically gather the current displacement S of power piston by displacement transducer and A/D capture card
2;
(5) stop powering to servovalve;
(6), when judgement loads forward current, whether power piston moves upward.If S
1> S
0and S
2> S
1, represent that power piston moves upward, otherwise represent that power piston moves downward, show test results.
Servovalve polarity chron under test negative current condition, test process and said process are similar, and just servovalve current load polarity is contrary.
When YD-4 type steering wheel servovalve loading forward current and electric current make zero, the displacement of power piston and drift value testing process are as shown in Figure 5.
Specifically comprise the following steps:
(1) click " test automatically " button on virtual test panel, start test;
(2) measurement and control program is powered to servovalve by D/A output card and V/I conversion isolated amplifier, (current load is progressively loading to+4mA progressively to load servovalve electric current, loading method is with the current load method in accompanying drawing 4, and other current load in this test also adopts same loading method);
(3) progressively load servovalve electric current to 0mA;
(4) stablize after 3 seconds, automatically gather the displacement (displacement acquisition method is with the displacement acquisition method in accompanying drawing 4, and other displacement acquisition method in this test also adopts same acquisition method) of No. 10 power pistons by displacement transducer and A/D capture card;
(5) test program is according to the displacement gathering, and whether automatic decision power piston is stable, if unstable, the zero displacement point S using maximum forward position as power piston
0;
(6) progressively load servovalve electric current, for be loaded on+2mA of altitude channel, for be loaded on+4mA of other passage;
(7) stablize after 3 seconds, automatically gather the displacement of No. 10 power pistons by displacement transducer and A/D capture card;
(8) test program is according to the displacement gathering, and whether automatic decision power piston is stable, if unstable, the current location S using maximum forward position as power piston
1, the displacement S=|S of power piston while calculating loading current
1-S
0|, should be 1.9 ± 0.2mm for altitude channel shift value, should be 3.6 ± 0.5mm for other passage shift value; If power piston is unstable, calculate maximum offset, side-play amount maximum value should not exceed 0.25mm.
(9) progressively load servovalve electric current to 0mA;
(10) stablize after 3 seconds, automatically gather the displacement of No. 10 power pistons by displacement transducer and A/D capture card;
(11) test program is according to the displacement gathering, and whether automatic decision power piston is stable, if unstable, the current location S using maximum forward position as power piston
2, the displacement S=|S of power piston when calculating electric current makes zero
2-S
0|, shift value should not exceed 0.25mm; If power piston is unstable, calculate maximum offset, side-play amount maximum value should not exceed 0.25mm.
(12) stop, to servovalve power supply, showing test results.
When test servovalve loads back current and electric current and makes zero, when the displacement of power piston and drift value, test process and said process are similar, are that servovalve current load polarity is contrary.
When YD-4 type steering wheel servovalve loads overload signal, power piston displacement measurement flow process as shown in Figure 6.
Specifically comprise the following steps:
(1) click " test automatically " button on virtual test panel, start test;
(2) measurement and control program is powered to servovalve by D/A output card and V/I conversion isolated amplifier, progressively loads servovalve electric current to+5mA (current load is progressively loading, and loading method is with the current load method in accompanying drawing 4);
(3) stablize after 3 seconds, automatically gather the displacement (displacement acquisition method is with the displacement acquisition method in accompanying drawing 4, and other displacement acquisition method in this test also adopts same acquisition method) of No. 10 power pistons by displacement transducer and A/D capture card;
(4) test program is according to the displacement gathering, and whether automatic decision power piston is stable, if unstable, the zero displacement point S using maximum forward position as power piston
0;
(5) servovalve electric current commutation, loads servovalve electric current to-5mA;
(6) stablize after 10 seconds, automatically gather the displacement of No. 10 power pistons by displacement transducer and A/D capture card;
(7) stop powering to servovalve;
(8) test program is according to the displacement gathering, and whether automatic decision power piston is stable, if unstable, the current location S using maximum forward position as power piston
1;
(9) the displacement S=|S of power piston while calculating current overload
1-S
0|, show test results.
When test servovalve loads under reverse overload signal power piston displacement, test process and said process are similar, are that servovalve current load polarity is contrary.
The testing process of the power piston positive movement inrush current of YD-4 type steering wheel servovalve as shown in Figure 7.
Specifically comprise the following steps:
(1) click " test automatically " button on virtual test panel, start test;
(2) measurement and control program, by D/A output card and V/I conversion isolated amplifier to the servovalve 0mA that powers, gathers the displacement of No. 10 power pistons automatically by displacement transducer and A/D capture card;
(3) test program is according to the displacement gathering, and whether automatic decision power piston is stable, if unstable, the zero displacement point S using maximum forward position as power piston
0;
(4) progressively load servovalve electric current to+1.5mA, servovalve current load step delta I gets 0.1mA; Each current load is complete, waits for after 3 seconds, automatically gathers the displacement of No. 10 power pistons by displacement transducer and A/D capture card, determines through data processing the position data S1 that power piston is current; Then incite somebody to action | S
1-S
0| S compares with motion criterion Δ, and this test method motion criterion Δ S gets 0.1mm, if | S
1-S
0| > Δ S, represents power piston setting in motion;
(5) showing ought be first | S
1-S
0| the current value I that > Δ S is corresponding
i, I
ibe servovalve forward inrush current; If servovalve current load is to+1.5mA, power piston is not motion also, shows will exceed+1.5mA of inrush current, shows test results overproof;
(6) stop powering to servovalve.
When test power piston positive movement inrush current, test process and said process are similar, and just servovalve current load polarity is contrary.
The time test flow process that the power piston of YD-4 type steering wheel servovalve moves to limit inferior by limes superiors as shown in Figure 8.
(1) click " test automatically " button on virtual test panel, start test;
(2) measurement and control program is powered to servovalve by D/A output card and V/I conversion isolated amplifier, progressively loads servovalve electric current to+4mA (current load is progressively loading, and loading method is with the current load method in accompanying drawing 4);
(3) in opening servovalve switch, by the counter C of measurement and control program timer
tmake zero; After this, collection period Δ t of every mistake, C
tnumerical value from increase 1, the collection period Δ t of this test method gets 0.1S.
(4) after power piston setting in motion, every through a data collection cycle Δ t, gather the displacement data of a power piston and process; In the time that the displacement difference of continuous three data collection cycles is all less than a certain numerical value Δ S, to think power piston stop motion, and be stop motion in the 1st data collection cycle from above-mentioned three data collection cycles finishes, timer stops timing;
(5) run duration of calculating power piston, run duration is (C
t-2) * Δ t.
(6) show test results.
When test power piston moves to the time of limes superiors by limit inferior, test process and said process are similar, and just the initial position of power piston is positioned at limit inferior.
The time difference of moving between power piston high-low limit is to calculate and draw according to above-mentioned two run durations that record.
Steering wheel servovalve performance automatic test method of the present invention is not only applicable to the testing property of YD-4 type four-way electro-hydraulic actuator servovalve, is equally applicable to the Testing Performances of Hydraulic Servo Valve of other type electro-hydraulic actuator and full electric steering engine; Its test event, except above-mentioned project, is also applicable to relate in Testing Performances of Hydraulic Servo Valve other test event of servovalve current load, displacement measurement and motion timing.
Claims (3)
1. an automatic testing device of servo valve performance of steering engine, it comprises tested steering wheel (12), hydraulic system and circuitry, described hydraulic system is made up of hydraulic power, steering wheel oil feeding line, steering wheel trim valve oil feeding line, oil return circuit, it is characterized in that described circuitry is that V/I conversion isolated amplifier (19) and D/A analog output card (20) are installed on the current control circuit of tested steering wheel servovalve (18), at output terminal (21) the installation position displacement sensor (22) of the power piston of steering wheel (12), displacement transducer (22) is connected with A/D capture card (23), D/A analog output card (20) is connected with Measurement &control computer (24) respectively with A/D capture card (23), preset control software in Measurement &control computer (24), carry out data processing and result shows and stores by Measurement &control computer (24).
2. a kind of automatic testing device of servo valve performance of steering engine according to claim 1, is characterized in that the hydraulic power of described hydraulic system comprises hydraulic oil container (1), low pressure oil filter (2), oil hydraulic pump (3), motor (4), relief valve (5), accumulator (6), one-way valve (7), high pressure oil filter (8); Steering wheel oil feeding line comprises steering wheel fuel feeding reduction valve (9), steering wheel fuel feeding throttle valve (10) and steering wheel charge oil pressure table (11); Steering wheel trim valve oil feeding line comprises steering wheel trim valve fuel feeding reduction valve (13), steering wheel trim valve fuel feeding throttle valve (14) and steering wheel trim valve charge oil pressure table (15); Oil return circuit comprises return pressure table (16) and oil return oil filter (17).
3. the device described in employing claim 1 or 2, to steering wheel servovalve performance automatic test method, is characterized in that comprising the steps:
Before a test, need the D/A analog output card in device and V/I conversion isolated amplifier to proofread and correct, when test, pass through D/A analog output card output voltage control signal by the control software in Measurement &control computer, this voltage control signal is changed isolated amplifier by V/I and is converted corresponding current signal to, send into the servovalve of tested steering wheel, control moving up and down of steering wheel power piston;
The displacement of b power piston converts voltage signal to by displacement transducer and passes to A/D capture card, and the signal of collection is flowed to Measurement &control computer by A/D capture card;
C Measurement &control computer records the control voltage data of servovalve electric current, the displacement data of power piston, the run duration data of power piston simultaneously, then carry out data processing and calculating according to test data, thereby the performance of automatically determining servovalve, finally shows processing result and stores.
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|---|---|---|---|
| CN201110171745.0A CN102287419B (en) | 2011-06-16 | 2011-06-16 | Device and method for automatically testing performance of steering engine servo valve |
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|---|---|---|---|
| CN201110171745.0A CN102287419B (en) | 2011-06-16 | 2011-06-16 | Device and method for automatically testing performance of steering engine servo valve |
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