CN102287419A - 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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- CN102287419A CN102287419A CN201110171745A CN201110171745A CN102287419A CN 102287419 A CN102287419 A CN 102287419A CN 201110171745 A CN201110171745 A CN 201110171745A CN 201110171745 A CN201110171745 A CN 201110171745A CN 102287419 A CN102287419 A CN 102287419A
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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 servovalve technical field of performance test, is a kind of steering wheel servovalve performance automatic test method specifically.
Background technique:
Electricity liquid steering wheel 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 characteristics of electricity and hydraulic pressure two aspects, has the control accuracy height, speed of response is fast, signal processing is flexible, output power is big and 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.
Because the high-accuracy property of servovalve, with and key position in steering wheel and even whole control system, the test of servovalve for the performance index that guarantee servovalve and guarantee steering wheel accurately, acceleration, stable work be all significant.At deciding in inspection and the maintenance process of steering wheel, all need its servovalve is carried out the strictness test, whether check feature reaches the requirement of relevant index.
The test event of steering wheel servovalve is bigger at steering wheel test event proportion, conventional test methodologies is to adopt external servovalve electric current deceleration loading device, pass through manual tune, the loading direction and the size of control servovalve electric current, in test process, according to test request, by slow rotation " adjusting of servovalve electric current " knob with stir " servovalve commutation " switch, the loading of control servovalve electric current, and the displacement of measuring the steering wheel power piston by dial gauge, adopt stopwatch to carry out timing for the test event that needs timing, determine every performance of steering wheel servovalve by this manual test method.This traditional test method automaticity is not high, efficient is low, testing precision is poor, the loading velocity of electric current has influenced precision of test result largely in addition, and testing precision depends on tester's professional skill and test experience largely.
Summary of the invention:
The objective of the invention is to overcome the deficiency of above-mentioned prior art, and a kind of steering wheel servovalve performance automatic test device is provided.
Another object of the present invention provides a kind of steering wheel servovalve performance automatic test method.
The present invention has mainly solved existing manual test method and has determined that every automatic performance degree of steering wheel servovalve is not high, efficient is low, testing precision is poor, the loading velocity of electric current has influenced precision of test result largely in addition, and testing precision depends on problems such as tester's professional skill and test experience largely.
To achieve these goals, the present invention adopts following technological scheme: a kind of steering wheel servovalve performance automatic test device, 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 amount output integrated circuit board are installed on the current control circuit of tested steering wheel servovalve, to replace the manual regulating current device of traditional servovalve; Output terminal installation position displacement sensor at the power piston of steering wheel, to replace traditional dial gauge, displacement transducer is connected with the A/D capture card, D/A analog amount output integrated circuit board is connected with the observing and controlling computer respectively with the A/D capture card, preset control software in the observing and controlling computer, carry out data processing and result's demonstration and storage by the observing and controlling 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, promptly irrelevant, only relevant with the input control voltage signal with the servovalve coil resistance, allow loading coil resistance to fluctuate within the specific limits, and the size of output current and input control voltage is big or small 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 steering wheel servovalve performance automatic test device of the present invention adopts the self-clocking of control software for the test event that needs timing, to replace traditional stopwatch manual time keeping.
A kind of steering wheel servovalve performance automatic test device of the present invention, the hydraulic power of its described hydraulic system comprise hydraulic oil container, low pressure oil filter, oil hydraulic pump, motor, relief valve, accumulator, one-way valve, high pressure oil filter; The 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:
Need before a test output integrated circuit board of the D/A analog amount in the device and V/I conversion isolated amplifier are proofreaied and correct, export the integrated circuit board output voltage control signal by the control software in the observing and controlling computer by the D/A analog amount during test, this voltage control signal converts corresponding current signal to by V/I conversion isolated amplifier, 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 the A/D capture card, and the A/D capture card is given the observing and controlling computer with the signal conveys of gathering;
C observing and controlling computer writes down the control voltage data of servovalve electric current simultaneously, the displacement data of power piston, the run duration data of power piston, carry out data processing and calculating according to test data then, thereby determine the stationarity of servovalve automatically, polarity, servovalve just loading/displacement and the drift value of power piston when back current and electric current make zero, the displacement of power piston under the overload signal, power piston just/the 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 the power piston high-low limit, at last processing result is shown and store.
Steering wheel servovalve performance automatic test method of the present invention, there is some difference to allow the servovalve coil resistance of different tested steering wheels during test, and its resistance can fluctuate in 20% the scope up and down at nominal value.
Compared with the prior art a kind of steering wheel servovalve performance automatic test device 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 guarantee linear output; 2, adopt of the adjusting of control software, solved that electric current loads step-length and loads the problem that rule varies with each individual in the traditional-handwork test by D/A analog amount output integrated circuit board and V/I conversion isolated amplifier control servovalve electric current; 3, adopt the displacement of displacement sensor steering wheel power piston, solved and adopted the dial gauge Displacement Measurement to occur human error, problem that reading error is big easily in the traditional-handwork test; 4, adopt the self-clocking of control software, the motion timing is finished by the nonsynchronous timer in the CVI software, has solved to adopt artificial start and stop manual time-keeping to occur human error, problem that timing error is big easily in the traditional test; 5, can realize in the steering wheel test and the automatic test of servovalve dependence test project, the demonstration and the storage of test result, and the prompting of testing overproof project, can increase substantially automaticity, the testing efficiency of servovalve test, reduce the testing property of steering wheel servovalve simultaneously to tester's the professional skill and the degree of dependence of test experience, increased substantially the precision and the degree of accuracy of test.
Description of drawings:
Fig. 1 is a test philosophy block diagram of the present invention;
Fig. 2 is a hydraulic system principle figure of the present invention;
Fig. 3 is a servovalve stationarity test flow chart;
Fig. 4 is a servovalve polarity test flow chart;
Drift value test flow chart when the displacement of power piston and electric current made zero when Fig. 5 was 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 by limes superiors a time test flow chart.
Embodiment:
In order to understand better and to implement, the present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment.
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; The 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 with steering wheel oil feeding line pressure gauge 11 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 is connected with tested steering wheel 12; Tested steering wheel 12 is connected with the 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 by oil return circuit pressure gauge 16 and the filter of oil return circuit oil 17;
Circuitry is that V/I conversion isolated amplifier 19 and D/A analog amount output integrated circuit board 20 are installed on the current control circuit of tested steering wheel servovalve 18, output terminal 21 installation position displacement sensors 22 at the power piston of steering wheel 12, displacement transducer 22 is connected with A/D capture card 23, D/A analog amount output integrated circuit board 20 is connected with observing and controlling computer 24 respectively with A/D capture card 23, preset control software in the observing and controlling computer 24, carry out data processing and result's demonstration and storage by observing and controlling computer 24; For the test event that needs timing, preset the self-clocking of control software in the observing and controlling computer 7;
More than connect to form steering wheel servovalve performance automatic test device of the present invention.
Steering wheel servovalve performance automatic test device of the present invention, its automatic test approach is as follows: need before the test output integrated circuit board of the D/A analog amount in the device and V/I conversion isolated amplifier are proofreaied and correct; There is some difference to allow the servovalve coil resistance of different tested steering wheels during test, and its resistance can fluctuate in 20% the scope up and down at nominal value; During test by the control software in the observing and controlling computer according to current selected test event with the control law determined automatically by D/A analog amount output integrated circuit board output voltage control signal (output voltage-5V～+ 5V), then by V/I conversion isolated amplifier will control the current signal that voltage signal is converted to correspondence (output current-5mA～+ 5mA), the loading step-length of servovalve electric current is determined according to test event, is no more than the servovalve electric current usually and loads 10% of scope; Send into the servovalve of tested steering wheel again, control moving up and down of steering wheel power piston; The displacement of power piston by displacement transducer convert 0 to～+ voltage signal of 5V, and pass to the A/D capture card, send into the A/D modular converter of observing and controlling computer by the A/D capture card;
Power piston moves to time of limit inferior by limes superiors, and power piston is moved to the timework of the test events such as time of limes superiors and finished automatically by the TT﹠C software of observing and controlling computer by limit inferior; TT﹠C software adopts to be designed and developed based on the LabWindows/CVI of the America NI company virtual instrument software of C language, and TT﹠C software uses the nonsynchronous timer in the CVI software, finishes the work of the acquisition interval Δ t of timing in the test process and specified data; Carry out data processing and calculating according to test data by the observing and controlling computer then, thereby determine stationarity, the polarity of servovalve automatically, servovalve just loading/displacement and the drift value of power piston when back current and electric current make zero, the displacement of power piston under the overload signal, power piston just/the 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 the power piston high-low limit, at last processing result is shown and storage.
YD-4 type steering wheel servovalve stationarity testing process as shown in Figure 3.
Specifically may further comprise the steps:
(1) " test automatically " button on the click virtual test panel begins test;
(2) measurement and control program is powered to servovalve by D/A output card and V/I conversion isolated amplifier, and progressively loads the servovalve electric current to+4mA, progressively loads the servovalve electric current then to 0mA, and the electric current of this test method loads step delta I and gets 0.5mA usually;
(3) stablized for 3 seconds after, by the displacement that displacement transducer and A/D capture card are gathered No. 10 power pistons automatically, this test method data capture interval of delta t is got 0.1S;
(4) test program judges automatically according to the displacement of gathering whether power piston is stable.Criterion is 10 maximum value S in the shift value
MaxWith minimum value S
MinPoor | S
Max-S
Min| S compares with the stability criterion Δ, and this test method stability criterion Δ S gets 0.1mm (calculate according to the resolution of capture card and the linearity of displacement transducer, and suitably amplify), if | S
Max-S
Min|＜Δ S, think that then power piston is stable; Otherwise, then think the power piston instability.If stable, then the shift value that 10 anti-Flutter mean value methods of shift values employing are carried out obtaining behind the digital filtering is as the S at zero point of power piston
0If unstable, then with the zero displacement point S of maximum forward position as power piston
0
(5) output servovalve electric current-0.5mA, stablized for 3 seconds after, stop to power to servovalve;
(6) stablized for 3 seconds after, gather the current displacement S of power piston automatically by displacement transducer and A/D capture card
1
(7) the maximum drift amount S=|S of calculating power piston
1-S
0|, the maximum drift amount should not surpass 0.25mm, judges that whether it meets the demands, and shows test results.
During the servovalve stationarity, test process and said process are similar under the test inverse current polarity condition, and just servovalve electric current loading polarity is opposite.
YD-4 type steering wheel servovalve polarity test flow process as shown in Figure 4.
Specifically may further comprise the steps:
(1) " test automatically " button on the click virtual test panel begins test;
(2) measurement and control program to the servovalve 0mA that powers, is automatically gathered power piston current displacement S by displacement transducer and A/D capture card by D/A output card and V/I conversion isolated amplifier
0
(3) progressively load the servovalve electric current to+2mA (electric current is loaded as progressively and loads, and loading method is with the electric current loading method in the accompanying drawing 4), gather the current displacement S of power piston automatically by displacement transducer and A/D capture card
1
(4) progressively load the servovalve electric current to+4mA (electric current is loaded as progressively and loads, and loading method is with the electric current loading method in the accompanying drawing 4), gather the current displacement S of power piston automatically by displacement transducer and A/D capture card
2
(5) stop to power to servovalve;
(6) judge whether power piston moves upward when loading forward current.If S
1＞S
0And S
2＞S
1, represent that then power piston moves upward, otherwise represent that power piston moves downward, show test results.
Servovalve polarity chron under the test negative current condition, test process and said process are similar, and just servovalve electric current loading polarity is opposite.
The displacement of power piston and drift value testing process were as shown in Figure 5 when YD-4 type steering wheel servovalve loading forward current and electric current made zero.
Specifically may further comprise the steps:
(1) " test automatically " button on the click virtual test panel begins test;
(2) measurement and control program is powered to servovalve by D/A output card and V/I conversion isolated amplifier, (electric current is loaded as progressively and loads to+4mA progressively to load the servovalve electric current, loading method is with the electric current loading method in the accompanying drawing 4, and other electric current in this test loads and also adopts same loading method);
(3) progressively load the servovalve electric current to 0mA;
(4) stablized for 3 seconds after, the displacement (the displacement acquisition method is with the displacement acquisition method in the accompanying drawing 4, and other displacement acquisition method in this test also adopts same acquisition method) of gathering No. 10 power pistons by displacement transducer and A/D capture card automatically;
(5) test program judges automatically according to the displacement of gathering whether power piston is stable, if unstable, then with the zero displacement point S of maximum forward position as power piston
0
(6) progressively load the servovalve electric current, be loaded on+2mA, be loaded on+4mA for other passage for altitude channel;
(7) stablized for 3 seconds after, the displacement of gathering No. 10 power pistons by displacement transducer and A/D capture card automatically;
(8) test program judges automatically according to the displacement of gathering whether power piston is stable, if unstable, then with the current location S of maximum forward position as power piston
1, the displacement S=|S of power piston when calculating loading current
1-S
0|, should be 1.9 ± 0.2mm for the altitude channel shift value, should be 3.6 ± 0.5mm for other passage shift value; If the power piston instability is calculated maximum offset, the side-play amount maximum value should not surpass 0.25mm.
(9) progressively load the servovalve electric current to 0mA;
(10) stablized for 3 seconds after, the displacement of gathering No. 10 power pistons by displacement transducer and A/D capture card automatically;
(11) test program judges automatically according to the displacement of gathering whether power piston is stable, if unstable, then with the current location S of maximum forward position as power piston
2, the displacement S=|S of power piston when the calculating electric current makes zero
2-S
0|, shift value should not surpass 0.25mm; If the power piston instability is calculated maximum offset, the side-play amount maximum value should not surpass 0.25mm.
(12) stop to show test results to the servovalve power supply.
When the test servovalve loaded the displacement of back current and electric current power piston when making zero and drift value, test process and said process were similar, and just servovalve electric current loading polarity is opposite.
Power piston displacement measurement flow process as shown in Figure 6 when YD-4 type steering wheel servovalve loaded overload signal.
Specifically may further comprise the steps:
(1) " test automatically " button on the click virtual test panel begins test;
(2) measurement and control program is powered to servovalve by D/A output card and V/I conversion isolated amplifier, progressively loads the servovalve electric current to+5mA (electric current is loaded as progressively and loads, and loading method is with the electric current loading method in the accompanying drawing 4);
(3) stablized for 3 seconds after, the displacement (the displacement acquisition method is with the displacement acquisition method in the accompanying drawing 4, and other displacement acquisition method in this test also adopts same acquisition method) of gathering No. 10 power pistons by displacement transducer and A/D capture card automatically;
(4) test program judges automatically according to the displacement of gathering whether power piston is stable, if unstable, then with the zero displacement point S of maximum forward position as power piston
0
(5) servovalve electric current commutation loads the servovalve electric current to-5mA;
(6) stablized for 10 seconds after, the displacement of gathering No. 10 power pistons by displacement transducer and A/D capture card automatically;
(7) stop to power to servovalve;
(8) test program judges automatically according to the displacement of gathering whether power piston is stable, if unstable, then with the current location S of maximum forward position as power piston
1
The displacement S=|S of power piston when (9) calculating current overload
1-S
0|, show test results.
When the test servovalve loaded under the reverse overload signal power piston displacement, test process and said process were similar, and just servovalve electric current loading polarity is opposite.
The testing process of the power piston positive movement inrush current of YD-4 type steering wheel servovalve as shown in Figure 7.
Specifically may further comprise the steps:
(1) " test automatically " button on the click virtual test panel begins test;
(2) measurement and control program by D/A output card and V/I conversion isolated amplifier to the servovalve 0mA that powers, the displacement of gathering No. 10 power pistons automatically by displacement transducer and A/D capture card;
(3) test program judges automatically according to the displacement of gathering whether power piston is stable, if unstable, then with the zero displacement point S of maximum forward position as power piston
0
(4) progressively load the servovalve electric current to+1.5mA, the servovalve electric current loads step delta I and gets 0.1mA; Each electric current has loaded, waited for for 3 seconds after, by the displacement of displacement transducer and No. 10 power pistons of the automatic collection of A/D capture card, determine the position data S1 that power piston is current through data processing; To then | 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, then represent the power piston setting in motion;
(5) showing ought be first | S
1-S
0| the current value I of＞Δ S correspondence
i, I
iBe servovalve forward inrush current; If the servovalve electric current is loaded on+1.5mA, power piston is not motion also, shows that then inrush current will surpass+1.5mA, and it is overproof to show test results;
(6) stop to power to servovalve.
During test power piston positive movement inrush current, test process and said process are similar, and just servovalve electric current loading polarity is opposite.
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) " test automatically " button on the click virtual test panel begins test;
(2) measurement and control program is powered to servovalve by D/A output card and V/I conversion isolated amplifier, progressively loads the servovalve electric current to+4mA (electric current is loaded as progressively and loads, and loading method is with the electric current loading method in the accompanying drawing 4);
(3) when opening the servovalve switch, with the counter C of measurement and control program timer
tMake zero; After this, a collection period Δ of every mistake t, C
tNumerical value from increasing 1, the collection period Δ t of this test method gets 0.1S.
(4) behind the power piston setting in motion, every through a data collection period Δ t, the displacement data of a power piston of collection is also handled; When the displacement difference of continuous three data collection period during, then think the power piston stop motion, and be stop motion in the 1st data collection period from above-mentioned three data collection period finishes that timer stops timing all less than a certain numerical value Δ S;
(5) run duration of calculating power piston, run duration is (C
t-2) * Δ t.
(6) show test results.
When the test power piston moved to the time of limes superiors by limit inferior, test process and said process were similar, and just the initial position of power piston is positioned at limit inferior.
The time difference of moving between the power piston high-low limit is to calculate according to above-mentioned two run durations that record to draw.
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 electricity liquid steering wheel servovalve, is equally applicable to the servovalve testing property of other type of electrical liquid steering wheel and full electric steering engine; Its test event also is applicable to other test event that relates to the loading of servovalve electric current, piston displacement measurement and motion timing in the servovalve testing property except that above-mentioned project.
Claims (3)
1. steering wheel servovalve performance automatic test device, it comprises tested steering wheel (12), hydraulic system and circuitry, it is characterized in 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 (19) and D/A analog amount output integrated circuit board (20) are installed on the current control circuit of tested steering wheel servovalve (18), output terminal (21) installation position displacement sensor (22) at the power piston of steering wheel (12), displacement transducer (22) is connected with A/D capture card (23), D/A analog amount output integrated circuit board (20) is connected with observing and controlling computer (24) respectively with A/D capture card (23), the observing and controlling computer presets control software in (24), carries out data processing and result's demonstration and storage by observing and controlling computer (24).
2. a kind of steering wheel servovalve performance automatic test device 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); The 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. adopt claim 1,2 described devices to steering wheel servovalve performance automatic test method, it is characterized in that comprising the steps:
Need before a test output integrated circuit board of the D/A analog amount in the device and V/I conversion isolated amplifier are proofreaied and correct, export the integrated circuit board output voltage control signal by the control software in the observing and controlling computer by the D/A analog amount during test, this voltage control signal converts corresponding current signal to by V/I conversion isolated amplifier, 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 the A/D capture card, and the A/D capture card is given the observing and controlling computer with the signal conveys of gathering;
C observing and controlling computer writes down the control voltage data of servovalve electric current, the displacement data of power piston, the run duration data of power piston simultaneously, carry out data processing and calculating according to test data then, thereby determine the performance of servovalve automatically, at last processing result is shown and store.
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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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| CN112278318A (en) * | 2020-09-22 | 2021-01-29 | 长沙五七一二飞机工业有限责任公司 | Helicopter hydraulic steering engine tester and test method |
| CN112278318B (en) * | 2020-09-22 | 2022-05-17 | 长沙五七一二飞机工业有限责任公司 | Helicopter hydraulic steering engine tester and test method |
| CN113252339A (en) * | 2021-06-11 | 2021-08-13 | 四川航天长征装备制造有限公司 | Damping type mechanical simulation steering engine |
| CN113252339B (en) * | 2021-06-11 | 2021-10-01 | 四川航天长征装备制造有限公司 | Damping type mechanical simulation steering engine |
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