CN103033380B - Landing gear retractable test loading method - Google Patents
Landing gear retractable test loading method Download PDFInfo
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- CN103033380B CN103033380B CN201210531683.4A CN201210531683A CN103033380B CN 103033380 B CN103033380 B CN 103033380B CN 201210531683 A CN201210531683 A CN 201210531683A CN 103033380 B CN103033380 B CN 103033380B
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Abstract
The invention relates to the field of an aircraft structure strengthen test, in particular to a landing gear retractable test loading device and a method. The landing gear retractable test loading device and the method overcome the shortcoming that a retractable load applying error is large and enable the retractable load applying error to be less than or equal to 2 %. The method includes that firstly an equation set of a retractable load F, a rotary shaft rotary torque M, a coordinate of a point S and a rotary angle theta is built, and regression solution is carried out by an iteration method. After optimization selection, a group of the coordinate of a fixed point S of a pulley and the retractable load F which are used for test is obtained. The virtual list function is utilized to achieve travel of a retractable actuator cylinder being transformed into the retractable load of a landing gear. One displacement sensor is fixed on the retractable actuator cylinder and used for measuring the travel of the retractable actuator cylinder, a force sensor is installed between a steering pulley and a loading point of a test part and used for measuring an actual applied retractable load, a computer controls a loading actuator cylinder to exert retractable load through a speed change device by steering of the pulley and through a wire rope attached on the loading point of the test part.
Description
Technical field
The present invention relates to aeronautic structure strength test field, specifically a kind of undercarriage control test loading method.
Background technology
The object of undercarriage control test is the draw-in and draw-off function of investigation under the effect of folding and unfolding load and the abrasion condition at each position.Its difficult point is applying and the control of folding and unfolding load.In the process that undercarriage is received and put, the folding and unfolding load suffered by it constantly changes with packing up angle the moment of turning axle, forms two M curves.In the process of undercarriage control, how to simulate the applying of these two M curves? in in the past domestic folding and unfolding test, mainly contain following two kinds of methods.
First is adopt the method applying balancing weight hierarchical loading, namely when ensureing that the moment of turning axle is constant, load allows to replace with making a concerted effort, after loading spectrum being carried out engineering simplification by this principle, under the prerequisite of moment ensureing turning axle, turn to imposed load by steel cable suspended counterweight through pulley, load makes a concerted effort to be applied on false wheel.Due to main landing gear folding and unfolding speed, time on main landing gear is received with extended position, there is larger shock load to it in counterweight, and the error therefore tested is comparatively large, and folding and unfolding load can not accurately apply.
Second is adopt the method for the variable force load maintainer of design specialized to apply.The method devises two loading discs together, and one of them is disk, and another is cam disc, and wherein disk hangs weight, provides constant moment, obtains real-time change curve by change cam radius.The method does not fundamentally solve a folding and unfolding load applying uncontrolled difficult problem, and its loading accuracy places one's entire reliance upon the precision of machining, and therefore the experimentation cost of the method is higher, and load error is comparatively large, does not have generalization.
In the above described two methods, the applying of load is all not controlled, and therefore load error is comparatively large, can not realize the object of experiment investigation completely.
Summary of the invention
Goal of the invention: for overcoming balancing weight hierarchical loading method and the large deficiency of variable force load maintainer method load error, the present invention proposes a kind of undercarriage control test loading method.
Technical scheme:
A kind of undercarriage control test loading method, use a kind of undercarriage control experiment loading unit, comprise side direction column, the loading pressurized strut be connected on side direction column, with the speed change gear, the cable wire that is connected to speed change gear that load pressurized strut and be connected, cable wire is connected with force snesor through deflection sheave, force snesor is connected with testpieces, loads pressurized strut and comprises hydraulic buttery valve; Described speed change gear comprise frame, by the rack-mounted gear of bearing seat, with the co-axially fixed flywheel of gear, with the tooth bar of gears meshing, described tooth bar with load pressurized strut be connected, move in tooth bar slide rail; Described cable wire realizes the connection with flywheel by the connecting hole be arranged on flywheel, and pressurized strut band carry-over bar moves, and tooth bar is by gear driven flywheel turns, and flywheel band running wire moves; Described speed change gear also comprises spacing pulley, and described spacing pulley is arranged in frame, tangent with flywheel;
, comprising:
Determine the step of loading scheme: the M that test mission book provides
put down, M
in receipts, all there is relation one to one in R and θ, that is:
M
put down=M
put down(θ)
M
in receipts=M
in receipts(θ)
R＝R(θ)
Wherein: θ-undercarriage corner
R-retractable actuating cylinder stroke
M
put down-gear down time folding and unfolding load to the moment of turning axle
M
in receiptsduring-undercarriage stowage, folding and unfolding load is to the moment of turning axle
Need by M
put downand M
in receiptsbe treated to the load F that can apply
put downand F
in receipts; From above-mentioned relation: F
put downand F
in receiptsand there is relation one to one between R, that is:
F
put down=F
put down(R)
F
in receipts=F
in receipts(R)
During test, a displacement transducer is fixed on retractable actuating cylinder and is used for measuring retractable actuating cylinder stroke R, by above-mentioned relation input control system, apply F by the loading pressurized strut in control system controlled loading device
put downand F
in receipts;
Calculate folding and unfolding load F
put downand F
in receiptsand the step of deflection sheave position B:
F
put down=M
put down÷ L
F
in receipts=M
in receipts÷ L;
A＝A(θ)
Wherein, L-arm of force, the bee-line namely between turning axle to AB;
The coordinate of A-force snesor and testpieces link position A;
Pulley center B is space any point, and its coordinate once determining, then can obtain the F determined
put downand F
in receipts; The track of undercarriage control is the curved surface in a space, therefore, and F
put downand F
in receiptscan be analyzed to the component of a vertical rotating shaft and the component of a parallel rotary axes, the component F of parallel rotary axes does not form the moment to turning axle, minimum for target with the component F of parallel rotary axes, the scope of B point coordinate is determined with practical ranges, utilize EXCEL software to carry out programming evaluation, determine the position of deflection sheave center B;
By folding and unfolding load F
put downand F
in receiptswith the step of retractable actuating cylinder stroke R relation table input control system:
Use TABLE editting function in MOOG coordinated loading control system, the displacement calculated and load corresponding relation are inputted X-values, Y-values in the Transfer in this system Shared Memory attribute, wherein displacement input X-values, load input Y-values; In receipts and situation of putting down respectively edit a TABLE;
Apply folding and unfolding load F
put downand F
in receiptsstep:
In undercarriage control motion process, same retractable actuating cylinder stroke R has F
put downand F
in receiptstwo kinds of different loads occur, only use TABLE can not judge folding and unfolding state, and therefore, increase folding and unfolding state tag, completion status judges; Re-use the SpecialFunction function calculating load loading passage,
Computing formula is:
Imposed load (Ch_2)=virtual input channel 1 (Sm_1) × virtual control channel 3 (Ch_3)+virtual input channel 2 (Sm_2) × virtual control channel 4 (Ch_4); Loading pressurized strut in control system controlled loading device applies the imposed load that loading path computation goes out.
Beneficial effect: the present invention can change the larger deficiency of folding and unfolding load applying error, utilizes the present invention that folding and unfolding load applying error can be allowed to be not more than 2%.First this method sets up the system of equations of folding and unfolding load F and rotating shaft torque M, S point coordinate and rotational angle theta, carries out Regressive Solution by process of iteration, through optimum choice, obtains coordinate and folding and unfolding load F that one group can be used for the pulley point of fixity S tested.Use the conversion of stroke to undercarriage control load of virtual list functional realiey retractable actuating cylinder.A displacement transducer is fixed on retractable actuating cylinder and is used for measuring retractable actuating cylinder stroke, between deflection sheave and testpieces load(ing) point, fill force cell for measuring the folding and unfolding load of actual applying, the pressurized strut of computing machine controlled loading to be turned to through pulley by speed change gear and applies folding and unfolding load by tying up to cable wire on testpieces load(ing) point.
Accompanying drawing explanation
Fig. 1 is charger front elevation
Fig. 2 is charger left view
Fig. 3 is tooth bar slide type rail system structural drawing
Fig. 4 is gear structure figure
Fig. 5 is rack structure figure
Fig. 6 is flywheel structure figure
Fig. 7 is bearing seat outside drawing
Fig. 8 is the inner installation diagram of bearing seat
Fig. 9 is undercarriage control test installation diagram
Wherein: 1. frame 2. gear 3. tooth bar 4. flywheel 5. tooth bar slide type rail system 6. pivot pin 7. bearing seat 8. sliding rail frame 9. bolt 10. nut 11. back-up ring 12. lining 13. cylinder roller bearing 14. thrust ring 15. deep groove ball bearing
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, refers to Fig. 1 to Fig. 9.
The present invention includes frame 1, gear 2, tooth bar 3, flywheel 4, tooth bar slide type rail system 5, cable wire, deflection sheave and loading pressurized strut.Frame channel-section steel is welded.Tooth bar slide rail 5 and frame 1 weld together, tooth bar 3 is placed on tooth bar slide rail 5, gear 2 and large flywheel 4 are linked together by pivot pin 6, and gear 2 is arranged in frame by bearing seat 7 with the connector of large flywheel 4, and are formed with the tooth bar 3 be placed on tooth bar slide rail 5 and engage.
Tooth bar slide type rail system 5 is made up of two slide rails, and the structure of two slide rails is identical, and the two ends that two slide rails are arranged on frame respectively are just constituted tooth bar slide type rail system.Single slide rail is made up of 1 sliding rail frame be welded, 8,1 bolt, 9,1 nut, 10,1 back-up ring, 11,2 linings 12 and 2 cylinder roller bearings 13.Its effect ensures tooth bar 3 moving linearly in slide type rail system 5, thus ensure engaging of gear 2 and tooth bar 3
Gear 3 and flywheel 2 are linked together by 3 pivot pins 6, the axle of gear 2 is supported in frame 1 by two bearing seats 7, single bearing seat 7 is embedded with two thrust rings 14 and 1 deep groove ball bearing 15, to ensure that the axle of gear 3 can freely rotate and not move axially in bearing seat 7.
Tooth bar 3 is placed on tooth bar slide type rail system 5, forms meshing relation with the gear 2 be arranged in frame 1, and the other end of tooth bar 3 is connected with loading pressurized strut by 1 ears, and load pressurized strut and be arranged on side direction column, side direction column is fixed on load bearing floor.
Tire is similar to outside flywheel 4, its diameter is 5 times of coupled gear 2 diameter, the object of such design to be when undercarriage control by the diameter of flywheel 4 and gear 2 than the linear velocity that tooth bar 3 moves being amplified 5 times, thus the linear velocity of the pressurized strut be connected with tooth bar 3 is also exaggerated 5 times.Flywheel 4 along the circumferential direction has arc groove, in groove, be wound around the cable wire that about 10m is long, one end of cable wire is connected with flywheel, and the other end is connected with force snesor by deflection sheave, force snesor is connected with undercarriage by the cable wire that about 0.5m is long again, thus completes the connection of folding and unfolding load applying path.
A kind of undercarriage control test loading method, uses experiment loading unit recited above, comprising:
Determine the step of loading scheme:
The M that test mission book provides
put down, M
in receipts, all there is relation one to one in R and θ, that is:
M
put down=M
put down(θ)
M
in receipts=M
in receipts(θ)
R＝R(θ)
Wherein: θ-undercarriage corner
R-retractable actuating cylinder stroke
M
put down-gear down time folding and unfolding load to the moment of turning axle
M
in receiptsduring-undercarriage stowage, folding and unfolding load is to the moment of turning axle
Need by M
put downand M
in receiptsbe treated to the load F that can apply
put downand F
in receipts.From above-mentioned relation: F
put downand F
in receiptsand there is relation one to one between R, that is:
F
put down=F
put down(R)
F
in receipts=F
in receipts(R)
During test, a displacement transducer is fixed on retractable actuating cylinder and is used for measuring retractable actuating cylinder stroke R, by above-mentioned relation input control system, apply F by the loading pressurized strut in control system controlled loading device
put downand F
in receipts.
Calculate folding and unfolding load F
put downand F
in receiptsand the step of deflection sheave position B:
To calculate F
put downand F
in receiptsthen demand goes out turning axle to the bee-line and the arm of force that load the line of force, because the equation of turning axle is known, so the equation loading the line of force need be determined, and load the line that the line of force is force snesor and testpieces link position A and deflection sheave center B in charger, and the coordinate of force snesor and testpieces link position A is known, and change along with the change of undercarriage rotational angle theta.So the coordinate of deflection sheave center B need be determined.
F
put down=M
put down÷ L
F
in receipts=M
in receipts÷ L
A＝A(θ)
L-arm of force, the bee-line namely between turning axle to AB
The coordinate of A-force snesor and testpieces link position A
From above-mentioned reasoning, pulley center B is space any point, and its coordinate once determining, then can obtain the F determined
put downand F
in receipts.The track of undercarriage control is the curved surface in a space, therefore, and F
put downand F
in receiptscan be analyzed to the component of a vertical rotating shaft and the component of a parallel rotary axes, the component F of parallel rotary axes does not form the moment to turning axle.Therefore, minimum for target with the component F of parallel rotary axes, determine the scope of B point coordinate with practical ranges, utilize EXCEL software to carry out programming evaluation, the position of deflection sheave center B can be determined.Also F can be obtained
put downand F
in receipts.
By folding and unfolding load F
put downand F
in receiptswith the step of retractable actuating cylinder stroke R relation table input control system:
Use TABLE editting function in MOOG coordinated loading control system, the displacement calculated and load corresponding relation are inputted X-values, Y-values in the Transfer in this system Shared Memory attribute, wherein displacement input X-values, load input Y-values.In receipts and situation of putting down respectively edit a TABLE.
Apply folding and unfolding load F
put downand F
in receiptsstep:
In undercarriage control motion process, same retractable actuating cylinder stroke R has F
put downand F
in receiptstwo kinds of different loads occur, only use TABLE can not judge folding and unfolding state, and therefore, increase folding and unfolding state tag, completion status judges.Re-use the SpecialFunct ion function calculating load loading passage,
Computing formula is:
Imposed load (Ch_2)=virtual input channel 1 (Sm_1) × virtual control channel 3 (Ch_3)+virtual input channel 2 (Sm_2) × virtual control channel 4 (Ch_4).
The explanation of nouns of above-mentioned formula sees attached list, and the loading pressurized strut in control system controlled loading device applies the imposed load that loading path computation goes out.
Subordinate list
The present invention can change the larger deficiency of folding and unfolding load applying error, utilizes the present invention that folding and unfolding load applying error can be allowed to be not more than 2%.First this method sets up the system of equations of folding and unfolding load F and rotating shaft torque M, S point coordinate and rotational angle theta, carries out Regressive Solution by process of iteration, through optimum choice, obtains coordinate and folding and unfolding load F that one group can be used for the pulley point of fixity S tested.Use the conversion of stroke to undercarriage control load of virtual list functional realiey retractable actuating cylinder.A displacement transducer is fixed on retractable actuating cylinder and is used for measuring retractable actuating cylinder stroke, between deflection sheave and testpieces load(ing) point, fill force cell for measuring the folding and unfolding load of actual applying, the pressurized strut of computing machine controlled loading to be turned to through pulley by speed change gear and applies folding and unfolding load by tying up to cable wire on testpieces load(ing) point.
Claims (1)
1. a undercarriage control test loading method, use a kind of undercarriage control experiment loading unit, this device comprises side direction column, be connected to the loading pressurized strut on side direction column, the speed change gear be connected with loading pressurized strut, be connected to the cable wire of speed change gear, cable wire is connected with force snesor through deflection sheave, force snesor is connected with testpieces, load pressurized strut and comprise hydraulic buttery valve, described speed change gear comprises frame, by the rack-mounted gear of bearing seat, flywheel co-axially fixed with gear, with the tooth bar of gears meshing, described tooth bar is connected with loading pressurized strut, move in tooth bar slide rail, described cable wire realizes the connection with flywheel by the connecting hole be arranged on flywheel, and pressurized strut band carry-over bar moves, and tooth bar is by gear driven flywheel turns, flywheel band running wire moves, described speed change gear also comprises spacing pulley, and described spacing pulley is arranged in frame, tangent with flywheel,
It is characterized in that, comprising:
Determine the step of loading scheme: the M that test mission book provides
put down, M
in receipts, all there is relation one to one in R and θ, that is:
M
put down=M
put down(θ)
M
in receipts=M
in receipts(θ)
R＝R(θ)
Wherein: θ-undercarriage corner
R-retractable actuating cylinder stroke
M
put down-gear down time folding and unfolding load to the moment of turning axle
M
in receiptsduring-undercarriage stowage, folding and unfolding load is to the moment of turning axle
Need by M
put downand M
in receiptsbe treated to the load F that can apply
put downand F
in receipts; From above-mentioned relation: F
put downand F
in receiptsand there is relation one to one between R, that is:
F
put down=F
put down(R)
F
in receipts=F
in receipts(R)
During test, a displacement transducer is fixed on retractable actuating cylinder and is used for measuring retractable actuating cylinder stroke R, by above-mentioned relation input control system, apply F by the loading pressurized strut in control system controlled loading device
put downand F
in receipts;
Calculate folding and unfolding load F
put downand F
in receiptsand the step of deflection sheave position B:
F
put down=M
put down÷ L
F
in receipts=M
in receipts÷ L;
A＝A(θ)
Wherein, L-arm of force, the bee-line namely between turning axle to AB;
The coordinate of A-force snesor and testpieces link position A;
Pulley center B is space any point, and its coordinate once determining, then can obtain the F determined
put downand F
receiveon; The track of undercarriage control is the curved surface in a space, therefore, and F
put downand F
in receiptscan be analyzed to the component of a vertical rotating shaft and the component of a parallel rotary axes, the component F of parallel rotary axes does not form the moment to turning axle, minimum for target with the component F of parallel rotary axes, the scope of B point coordinate is determined with practical ranges, utilize EXCEL software to carry out programming evaluation, determine the position of deflection sheave center B;
By folding and unfolding load F
put downand F
in receiptswith the step of retractable actuating cylinder stroke R relation table input control system:
Use TABLE editting function in MOOG coordinated loading control system, the displacement calculated and load corresponding relation are inputted X-values, Y-values in the Transfer in this system Shared Memory attribute, wherein displacement input X-values, load input Y-values; In receipts and situation of putting down respectively edit a TABLE;
Apply folding and unfolding load F
put downand F
in receiptsstep:
In undercarriage control motion process, same retractable actuating cylinder stroke R has F
put downand F
in receiptstwo kinds of different loads occur, only use TABLE can not judge folding and unfolding state, and therefore, increase folding and unfolding state tag, completion status judges; Re-use the SpecialFunction function calculating load loading passage,
Computing formula is:
Imposed load (Ch_2)=virtual input channel 1 (Sm_1) × virtual control channel 3 (Ch_3)+virtual input channel 2 (Sm_2) × virtual control channel 4 (Ch_4); Loading pressurized strut in control system controlled loading device applies the imposed load that loading path computation goes out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210531683.4A CN103033380B (en) | 2012-12-11 | 2012-12-11 | Landing gear retractable test loading method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210531683.4A CN103033380B (en) | 2012-12-11 | 2012-12-11 | Landing gear retractable test loading method |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104139870B (en) * | 2013-05-10 | 2016-08-10 | 中国飞机强度研究所 | A kind of loading equipemtn erecting device |
| CN103604593B (en) * | 2013-11-21 | 2016-03-02 | 南京航空航天大学 | Plane type ejection launch carrier-borne aircraft front undercarriage static force test charger |
| CN103604619B (en) * | 2013-11-21 | 2016-01-20 | 南京航空航天大学 | Frame-type catapult-assisted take-off carrier-borne aircraft nose-gear slow test charger |
| FR3062722B1 (en) * | 2017-02-03 | 2019-04-19 | Safran Landing Systems | TARGET OF MAGNETIC MEASUREMENT |
| CN106965953B (en) * | 2017-03-31 | 2023-07-11 | 南京航空航天大学 | Undercarriage air-taking-out and air-taking-out dynamic load simulation device and loading method thereof |
| CN109866941B (en) * | 2019-03-28 | 2022-04-01 | 中国飞机强度研究所 | Accurate load application method in large deformation follow-up loading process of undercarriage |
| CN110816878B (en) * | 2019-10-18 | 2022-11-22 | 中国飞行试验研究院 | Undercarriage loading false wheel with simulation bearing support |
| CN110626493B (en) * | 2019-10-30 | 2023-04-11 | 中航通飞华南飞机工业有限公司 | Electric retraction control system based on large aircraft landing gear |
| CN112528410B (en) * | 2020-12-10 | 2024-03-15 | 南京航空航天大学 | Landing gear retraction track determining method and system |
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