CN106342190B - A kind of distortion compensating method for pressure and weighting - Google Patents
A kind of distortion compensating method for pressure and weightingInfo
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- CN106342190B CN106342190B CN201110016401.2A CN201110016401A CN106342190B CN 106342190 B CN106342190 B CN 106342190B CN 201110016401 A CN201110016401 A CN 201110016401A CN 106342190 B CN106342190 B CN 106342190B
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- weighting
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Abstract
The present invention is a kind of distortion compensating method for pressure and weighting, the method is to oiling or oil pumping in undercarriage damper leg by a kind of special purpose device, change hydraulic oil or nitrogen pressure in damper leg, pressure increases or is reduced to a certain degree, will there is relative displacement in undercarriage damper leg inner carrier and pillar urceolus, the frictional force in the time of critical relative displacement is maximum static friction force. Measure hydraulic oil or nitrogen pressure change procedure in oiling or oil pumping process, because the positive revesal maximum static friction force of undercarriage damper leg equates, positive revesal maximum pressure value is multiplied by the stressed sectional area of damper leg after being added and being averaged, just can obtain the aircraft actual weight that undercarriage carries, eliminate the measure error producing due to frictional force between undercarriage damper leg inner carrier and pillar urceolus.
Description
Technical field
The present invention is a kind of distortion compensating method for pressure and weighting, belongs to field of measuring technique.
Background technology:
At present, the measurement of Domestic Aircraft weight mainly adopt before aircraft, below main landing gear tirePlace the mode that on-ground weigher is measured. Aircraft is in the time of the inactive state of ground, and weight is propped up by undercarriageSupport, in undercarriage damper leg, the size of hydraulic oil or nitrogen pressure depends primarily on damper leg supportThe weight rising. For preventing overflowing of hydraulic oil and compressed nitrogen in undercarriage, undercarriage damper legBetween inner carrier and pillar outer tube inner wall, seal with multiple O type circles, seal degree depends on OThe size of type circle and pillar outer tube inner wall frictional force. Due to the existence of this frictional force, aircraft acts onPart weight on damper leg is supported by frictional force, and it is slow that pressure sensor directly measuresThe pressure that rushes the interior hydraulic oil of pillar or nitrogen can not calculate to act on undercarriage damper leg and flyThe actual weight of machine. This kind of this measuring process of method is more loaded down with trivial details, and data do not have real-time.
Summary of the invention
The present invention design for above-mentioned problems of the prior art just provide a kind of forThe distortion compensating method of pressure and weighting, its objective is true for what obtain that undercarriage carriesWeight, has eliminated owing to there being friction between undercarriage damper leg inner carrier and pillar outer tube inner wallPower and produce measure error.
Aircraft is static on ground frontly may experience the different process of load or unload, damper leg urceolusThe direction of the frictional force between inwall and undercarriage damper leg inner carrier may be upwards also may be toUnder, because aircraft is in balance inactive state, the size of this frictional force may remain on 0 to maximumArbitrary value between stiction. The maximum static friction force of some directions is a unknown quantity, noCan directly measure. The compensation method of undercarriage pressure distortion is to undercarriage by a kind of special purpose deviceOiling or oil pumping in damper leg, change hydraulic oil or nitrogen pressure in damper leg, and pressure increasesOr be reduced to a certain degree, will there is phase contraposition with pillar urceolus in undercarriage damper leg inner carrierMove, the frictional force in the time of critical relative displacement is maximum static friction force. Measure oiling or pumpedHydraulic oil or nitrogen pressure change procedure in journey, because the positive revesal maximum of undercarriage damper leg is quietFrictional force equates, after positive revesal maximum pressure value addition is averaged, is multiplied by the stressed cross section of damper legLong-pending, just can obtain the aircraft actual weight that undercarriage carries, eliminate due to undercarriage bufferingThe measure error that between post inner carrier and pillar urceolus, frictional force produces.
According to above-mentioned thinking, the particular content of technical solution of the present invention is:
Distortion compensating method for pressure and weighting of the present invention, is characterized in that: the methodStep is:
(1) the distortion compensation measurement mechanism that Bonding pressure is weighed
Fuel-displaced lower than one of hydraulic oil liquid level place connection in the hydraulic cushion pillar for pressure and weightingPipe is connected with pressure sensor on flowline, the other end connection hydraulic pressure isolation cylinder of flowlineOffside tank, offside tank is by seal diaphragm and offside tank isolation, and offside tank passes through respectivelyPipeline is connected with booster oil-out and oil tank with hydraulic selector, and booster oil-in connects oneHand-operating pressure pump, hand-operating pressure pump is also connected with oil tank;
(2) at hydraulic selector all in closed condition, in the load-carrying surface of hydraulic cushion pillar, load oneDetermine weight, after static stablizing, record the pressure value P of pressure sensor0；
(3) use hand-operating pressure pump to booster oiling supercharging, when the oil pressure in booster is higher than P0Time,Slowly open the hydraulic selector between booster and the offside tank of hydraulic isolation cylinder, record pressure and passThe pressure change procedure of sensor, until pressure vary stable keeping for 2 seconds is closed this hydraulic pressure and is openedClose, in said process, the oil pressure in booster is all the time higher than P0；
(4) slowly open the hydraulic selector between offside tank and the oil tank of hydraulic isolation cylinder, recordThe pressure change procedure of pressure sensor, until pressure vary stable keeping for 2 seconds is closed thisHydraulic selector;
(5) actual weight that calculating pressure is weighed
5.1 calculate the actual weight of pressure and weighting in oiling process:
W＝P1·S+F1Formula 1
In formula: the actual weight that W is pressure and weighting, P1For hydraulic cushion pillar inner carrier and pillarThe maximum pressure of the interior hydraulic oil of pillar or nitrogen while there is relative stretching trend between urceolus, F1For liquidPress the maximum static friction force between damper leg inner carrier and pillar urceolus, S is in hydraulic cushion pillarThe sectional area of piston;
5.2 calculate the actual weight of pressure and weighting in the process of draining the oil:
W＝P2·S-F2Formula 2
In formula: the actual weight that W is pressure and weighting, P2For hydraulic cushion pillar inner carrier and pillarThe minimum pressure of the interior hydraulic oil of pillar or nitrogen while there is relative compression trend between urceolus; F2For liquidPress the maximum static friction force between damper leg inner carrier and pillar urceolus, S is in hydraulic cushion pillarThe sectional area of piston;
5.3 merge formula 1 and formula 2, due to F1＝F2, eliminate maximum static friction force, meterCalculate the actual weight of pressure and weighting:
Brief description of the drawings
Fig. 1 is the structural representation of the distortion compensation measurement mechanism that adopts in the inventive method
Fig. 2 is when in the inventive method, distortion compensation is measured, undercarriage damper leg hydraulic oil or nitrogenAtmospheric pressure is conditional curve figure over time
Detailed description of the invention
Below with reference to accompanying drawing, embodiment is further described technical solution of the present invention:
Shown in accompanying drawing 1～2, adopt the step of this kind for the distortion compensating method of pressure and weightingBe:
(1) the distortion compensation measurement mechanism that Bonding pressure is weighed
In the hydraulic cushion pillar 1 for pressure and weighting, connecting one lower than hydraulic oil liquid level place goes outOil pipe 2 is connected with pressure sensor 3 on flowline 2, and the other end of flowline 2 connects hydraulic pressureThe offside tank 41 of isolation cylinder 4, offside tank 42 is by seal diaphragm 43 and offside tank 41Isolation, offside tank 42 is respectively by pipeline 5 and hydraulic selector 6 and booster 7 oil-outs and storageFuel tank 8 connects, booster 7 oil-ins connect a hand-operating pressure pump 9, hand-operating pressure pump 9 also withOil tank 8 connects;
(2) hydraulic selector 6 is placed in to closed condition, in the load-carrying surface 11 of hydraulic cushion pillar 1The loading undercarriage of boarding a plane, static stable after, record the pressure value P of pressure sensor 30；
(3) with hand-operating pressure pump 9 to booster 7 oiling superchargings, when the oil pressure in booster 7 higher than
P0Time, slowly open the hydraulic selector between booster 7 and the offside tank 42 of hydraulic isolation cylinder 46, the seal diaphragm 43 that promotes hydraulic isolation cylinder 4 is moved to the left, and makes the left side of hydraulic isolation cylinder 4Fuel tank 41 is smoothly to the interior oiling of hydraulic cushion pillar 1, and in pressure increase process, hydraulic cushion props upThere is relative displacement with pillar urceolus 13 in the piston 12 in post 1, this displacement stroke is controlled at 5～10mmScope in, record the pressure change procedure of pressure sensor 3, until pressure vary stable protectingHeld for 2 seconds, close this hydraulic selector 6, record in this process hydraulic cushion pillar inner carrier 12 withThe maximum pressure of the interior hydraulic oil of pillar 1 or nitrogen while there is relative stretching trend between pillar urceolus 13
P1, in said process, the oil pressure in booster 7 is all the time higher than P0；
(4) hydraulic pressure of slowly opening between offside tank 42 and the oil tank 8 of hydraulic isolation cylinder 4 is openedClose 6, because the interior oil pressure of offside tank 42 reduces, hydraulic cushion pillar 1 is at contained own wtUnder effect, the interior hydraulic oil of hydraulic cushion pillar 1 injects to hydraulic isolation cylinder 4 offside tanks 41, pushes awayThe seal diaphragm 43 of hydrodynamic pressure isolation cylinder 4 moves right, the offside tank 42 in hydraulic isolation cylinder 4In hydraulic oil be smoothly drawn to oil tank 8, pressure reduces in process, hydraulic cushion pillar 1There is relative displacement with pillar urceolus 13 in interior piston 12, this displacement stroke is controlled at 5～10mmScope in, record the pressure change procedure of pressure sensor 3, until pressure vary stable protectingHeld for 2 seconds, close this hydraulic selector 6, record in this process, hydraulic cushion pillar 1 inner carrier12 and pillar urceolus 13 between the minimum of 1 hydraulic oil or nitrogen in pillar while there is relative compression trendPressure P2；
In the process changing at taking out shown in Fig. 2, oiling pressure, treat that pressure increases or is reduced to oneDetermining degree, there is relative displacement with pillar urceolus 13 in undercarriage damper leg 1 inner carrier 12,Frictional force when critical relative displacement is maximum static friction force, and the pressure collecting at this place is forLarge force value, continues to take out, oiling pressure will be in steady state value, now in undercarriage damper leg 1Between piston 12 and pillar urceolus 13 in sliding friction state.
(5) actual weight that calculating pressure is weighed
5.1 calculate the actual weight of pressure and weighting in oiling process:
W＝P1·S+F1Formula 1
In formula: the actual weight that W is pressure and weighting, P1For hydraulic cushion pillar inner carrier 12 withThe maximum pressure of the interior hydraulic oil of pillar or nitrogen while there is relative stretching trend between post urceolus 13, F1For the maximum static friction force between hydraulic cushion pillar inner carrier 12 and pillar urceolus 13, S is hydraulic pressureThe sectional area of damper leg inner carrier 12;
5.2 calculate the actual weight of pressure and weighting in the process of draining the oil:
W＝P2·S-F2Formula 2
In formula: the actual weight that W is pressure and weighting, P2For hydraulic cushion pillar inner carrier 12 withThe minimum pressure of the interior hydraulic oil of pillar or nitrogen while there is relative compression trend between post urceolus 13; F2For the maximum static friction force between hydraulic cushion pillar inner carrier 12 and pillar urceolus 13, S is hydraulic pressureThe sectional area of damper leg inner carrier 12;
5.3 merge formula 1 and formula 2, due to F1＝F2, eliminate maximum static friction force, meterCalculate the actual weight of pressure and weighting:
Eliminate the impact of frictional force through above-mentioned calculating, obtained being supportted by this undercarriage damper legThe actual weight rising.
Undercarriage damper leg 1 inner carrier 12 is in compression and drawing process, to hydraulic oil or nitrogenActing, kinetic energy energy transform into heat energy, can change hydraulic oil or nitrogen temperature affects it to true pressureMeasure. In order to reduce this impact, inject and the amount of hydraulic oil of extracting out to keep one very littleValue, the compression of undercarriage damper leg 1 and the displacement of stretching are controlled in the scope of 5～10mm.
For accurate gaging pressure, can to undercarriage damper leg 1 carry out one in advance " inject-Extract out " circulation, make hydraulic oil in undercarriage damper leg 1 inner carrier 12 and pillar urceolus 13Contact-making surface sufficient lubrication between wall, then carry out formal measuring process.
Compared with prior art, technical solution of the present invention has been eliminated owing to living in undercarriage damper legBetween plug and pillar outer tube inner wall, there is frictional force and produce measure error, obtain undercarriage instituteThe actual weight of carrying.
Claims (1)
1. for a distortion compensating method for pressure and weighting, it is characterized in that: the step of the methodBe:
(1) the distortion compensation measurement mechanism that Bonding pressure is weighed
In the hydraulic cushion pillar (1) for pressure and weighting, connect one lower than hydraulic oil liquid level placeFlowline (2) is connected with pressure sensor (3) on flowline (2), the other end of flowline (2)Connect hydraulic pressure isolation cylinder (4) offside tank (41), offside tank (42) by seal diaphragm (43) withOffside tank (41) isolation, offside tank (42) on the one hand by pipeline (5) and hydraulic selector (6) andBooster (7) oil-out connects, and offside tank (42) is on the other hand by pipeline (5) and hydraulic selector(6) be connected with oil tank (8), booster (7) oil-in connects a hand-operating pressure pump (9), manuallyCompression pump (9) is also connected with oil tank (8);
(2) hydraulic selector (6) is all in closed condition, in the load-carrying surface (11) of hydraulic cushion pillar (1)Upper loading constant weight, after static stablizing, records the pressure value P of pressure sensor (3)0；
(3) use hand-operating pressure pump (9) to booster (7) oiling supercharging, when the oil pressure in booster (7)Higher than P0Time, slowly open between booster (7) and the offside tank (42) of hydraulic isolation cylinder (4)Hydraulic selector (6), records the pressure change procedure of pressure sensor (3), until pressure vary stableAnd kept for 2 seconds, close this hydraulic selector (6), in said process, the oil pressure in booster (7)All the time higher than P0；
(4) slowly open the liquid between offside tank (42) and the oil tank (8) of hydraulic isolation cylinder (4)Compress switch (6), record the pressure change procedure of pressure sensor (3), until pressure vary stable alsoKept for 2 seconds, close this hydraulic selector (6);
(5) actual weight that calculating pressure is weighed
5.1 calculate the actual weight of pressure and weighting in oiling process:
W＝P1·S+F1Formula 1
In formula: the actual weight that W is pressure and weighting, P1For hydraulic cushion pillar inner carrier (12) withWhile there is relative stretching trend between pillar urceolus (13), the maximum of the interior hydraulic oil of pillar or nitrogen is pressedBy force, F1For the maximum static friction force between hydraulic cushion pillar inner carrier (12) and pillar urceolus (13),S is the sectional area of hydraulic cushion pillar inner carrier (12);
5.2 calculate the actual weight of pressure and weighting in the process of draining the oil:
W＝P2·S-F2Formula 2
In formula: the actual weight that W is pressure and weighting, P2For hydraulic cushion pillar inner carrier (12) withWhile there is relative compression trend between pillar urceolus (13), the minimum of the interior hydraulic oil of pillar or nitrogen is pressedBy force; F2For the maximum static friction force between hydraulic cushion pillar inner carrier (12) and pillar urceolus (13),S is the sectional area of hydraulic cushion pillar inner carrier (12);
5.3 merge formula 1 and formula 2, due to F1＝F2, eliminate maximum static friction force, meterCalculate the actual weight of pressure and weighting:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110016401.2A CN106342190B (en) | 2011-12-29 | 2011-12-29 | A kind of distortion compensating method for pressure and weighting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110016401.2A CN106342190B (en) | 2011-12-29 | 2011-12-29 | A kind of distortion compensating method for pressure and weighting |
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| CN106342190B true CN106342190B (en) | 2015-08-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612562A (en) * | 2018-12-03 | 2019-04-12 | 江苏海宏信息科技有限公司 | A kind of silo material weight metering system and method based on distributed weighing node |
-
2011
- 2011-12-29 CN CN201110016401.2A patent/CN106342190B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612562A (en) * | 2018-12-03 | 2019-04-12 | 江苏海宏信息科技有限公司 | A kind of silo material weight metering system and method based on distributed weighing node |
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