CN105699039A - High and low temperature environment test device for landing gear drop test - Google Patents
High and low temperature environment test device for landing gear drop test Download PDFInfo
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- CN105699039A CN105699039A CN201610149656.9A CN201610149656A CN105699039A CN 105699039 A CN105699039 A CN 105699039A CN 201610149656 A CN201610149656 A CN 201610149656A CN 105699039 A CN105699039 A CN 105699039A
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- pore
- blending tank
- landing gear
- drop test
- low
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
- F25D3/102—Stationary cabinets
Abstract
The invention provides a high and low temperature environment test device for a landing gear drop test, which belongs to the technical field of helicopter landing gear drop tests. The device comprises a liquid nitrogen tank (1), a mixing tank (4), a heating bar (5), a magnetic fluid sealed agitator (6), a buffer soft package (7) and a wheel soft package (8), wherein the mixing tank (4) is used for mixing or heating nitrogen and air from the liquid nitrogen tank (1), the nitrogen and the air are uniformly agitated via the magnetic fluid sealed agitator (6) and transmitted to the buffer soft package (7) and the wheel soft package (8) via a hose, and thus, and test in a high and low temperature environment is carried out on the buffer and the wheel. Through arranging a temperature sensor and a valve at the hose and connecting the temperature sensor and the valve with a PID controller, high-precision and accurate control on the temperature needed by the test is carried out, and drop test requirements by the landing gear in the high and low temperature environment can be achieved.
Description
Technical field
The invention belongs to helicopter landing gear drop-test technical field, be specifically related to a kind of high-low-temperature environmental testing device for landing gear drop test。
Background technology
Undercarriage is extremely important parts on helicopter, it for the taking off of aircraft, land, ground roll-out and ground are parked, the performance of undercarriage directly decides the safety of take-off and landing。Along with widely using of the fields such as military in China, civilian, the rescue of helicopter, the safety of helicopter is also become more concerned with。China is vast in territory, from south to north, from winter to summer temperature Change very greatly, the particularly high altitude localities such as Xinjiang, Tibet。According to the meteorological data temperature for Harbin, Heilungkiang and Haikou, 2013 annual, the Harbin highest temperature 40 DEG C, the lowest temperature-25 DEG C, the Haikou highest temperature 45 DEG C, the lowest temperature 0 DEG C。The use temperature that helicopter specifies in development is generally-40 DEG C to 50 DEG C, under low temperature or hot environment, helicopter landing gear fall shake refer to helicopter simulating land, warship clash into a kind of Dynamic Characteristics Test, in order to make helicopter land, structural detail non-overloading in warship knockout process, undercarriage must effectively absorb land, warship clash into time produce energy；Also being verify that undercarriage buffer system is satisfied absorption design merit amount while, undercarriage transships, and whether pillar, tire used stroke meet design requirement, and whether mechanism reaches the only resource of intended strength and stiffness, for installation use offer scientific basis。
Summary of the invention
In order to solve the problems referred to above, the invention provides a kind of high-low-temperature environmental testing device for landing gear drop test, helicopter landing gear is made to carry out drop-test under-65～+80 DEG C of environment, checking helicopter landing gear absorbs design landing merit amount and the ability of merit amount deposit under high/low temperature bad border, and the design performance for evaluating helicopter landing gear provides scientific evaluation。Described device includes liquid nitrogen bottle, blending tank, heating rod, magnet fluid sealing agitator, the soft parcel of buffer and the soft parcel of wheel, wherein,
Blending tank, is used for mixing gas；
Liquid nitrogen bottle, connects blending tank, for inputting liquid nitrogen in blending tank；
Heating rod, is arranged in described blending tank, for the gas in described blending tank is heated；
Magnet fluid sealing agitator, is arranged in described blending tank, for the gas in described blending tank is stirred；
The soft parcel of buffer, wraps up buffer, and by blending tank described in two soft pipe connections；
The soft parcel of wheel, wraps up wheel, and by blending tank described in two soft pipe connections。
Preferably, described blending tank is provided with the first pore, the second pore, cold air mouth and steam mouth, first pore is input hole, connect the detachable connection of pipeline of liquid nitrogen bottle on this input hole, second pore connection outside air, and the second pore place is provided with valve, for controlling the discrepancy of gas in blending tank。
Such scheme has preferably, described blending tank is provided with electromagnetic valve on the first pore and the connecting pipe of liquid nitrogen bottle。
Having preferably in such scheme, soft the superscribing of described buffer is provided with the 3rd pore and the 4th pore, is connected cold air mouth and the steam mouth of blending tank respectively by the valve being disposed thereon。
Having preferably in such scheme, soft the superscribing of wheel is equipped with the 5th pore and the 6th pore, is connected cold air mouth and the steam mouth of blending tank respectively by the valve being disposed thereon。
Having preferably in such scheme, the steam mouth place of described blending tank is provided with negative pressure device, for drawing the gas in blending tank。
Having preferably in such scheme, described first pore, the second pore, the 3rd pore, the 4th pore, the 5th pore and the 6th pore place are provided with temperature sensor。
Having preferably in such scheme, the valve at described electromagnetic valve and the second pore, the 3rd pore, the 4th pore, the 5th pore and the 6th pore place is all connected with control system, control system the switch of valve is controlled。
Having preferably in such scheme, described controller is PID controller, and it is also connected with described temperature sensor。
In the present invention, when needs carry out low-temperature test, desired value is cooled the temperature to by the liquid-gas ratio example controlling to inject in blending tank, close electromagnetic valve, gas liquid mixture after regulating is injected in the soft soft parcel of parcel/wheel of buffer, and gas liquid mixture is uniformly injected into the air channel athwartship plane on buffer/wheel, make buffer/tire air temperature gradually reduce, reach desired value, thus inside working chamber reaches uniform decrease in temperature purpose。When needs carry out hot test, by adding heat pipe, gas is heated, due to the heated rear volumetric expansion of air, pressure in blending tank is also with to raising, it is transported in soft parcel by flexible pipe, makes the temperature of testpieces raise, and produce loop by another flexible pipe, constitute uninterrupted temperature circulatory system, keep the uniformity of temperature。
Carried out the high-low-temperature environmental testing of landing gear drop test by device provided by the invention and the mode that carries out freezing or heat, simple and easy to do, control accuracy is high, and result is stable。
Accompanying drawing explanation
Fig. 1 is the present invention structural representation for a preferred embodiment of the high-low-temperature environmental testing device of landing gear drop test。
Wherein, 1 is liquid nitrogen bottle, and 2 is electromagnetic valve, 3-1 is the first pore, and 3-2 is the second pore, and 3-3 is the 3rd pore, 3-4 is the 4th pore, and 3-5 is the 5th pore, and 3-6 is the 6th pore, 4 is blending tank, and 5 is heating rod, and 6 is magnet fluid sealing agitator, 7 is the soft parcel of buffer, 8 is the soft parcel of wheel, and 9 is flexible pipe, and 10 is negative pressure device。
Detailed description of the invention
For making purpose of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail。In the accompanying drawings, same or similar label represents same or similar element or has the element of same or like function from start to finish。Described embodiment is a part of embodiment of the present invention, rather than whole embodiments。The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention。Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention。Below in conjunction with accompanying drawing, embodiments of the invention are described in detail。
In describing the invention; it will be appreciated that; term " orientation or the position relationship of the instruction such as " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " be based on orientation shown in the drawings or position relationship; be for only for ease of the description present invention and simplifying and describe; rather than instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limiting the scope of the invention。
By the examples below the present invention is described in further details。
The invention provides a kind of high-low-temperature environmental testing device for landing gear drop test, helicopter landing gear is made to carry out drop-test under-65～+80 DEG C of environment, checking helicopter landing gear absorbs design landing merit amount and the ability of merit amount deposit under high/low temperature bad border, and the design performance for evaluating helicopter landing gear provides scientific evaluation。As shown in Figure 1, the structural representation of the high-low-temperature environmental testing device of landing gear drop test it is used for for the present invention, described device mainly includes liquid nitrogen bottle 1, blending tank 4, heating rod 5, magnet fluid sealing agitator 6, the soft parcel of buffer 7 and the soft parcel 8 of wheel, wherein
Blending tank 4, is used for mixing gas, and in the present embodiment, the volume of blending tank 4 is 150L-200L；
Liquid nitrogen bottle 1, connects blending tank 4, for inputting liquid nitrogen in blending tank 4；
Heating rod 5, is arranged in described blending tank 4, for the gas in described blending tank 4 is heated；
Magnet fluid sealing agitator 6, is arranged in described blending tank 4, for the gas in described blending tank 4 is stirred；
The soft parcel 7 of buffer, wraps up buffer, and connects described blending tank 4 by two flexible pipes 9；
The soft parcel 8 of wheel, wraps up wheel, and connects described blending tank 4 by two flexible pipes 9。
In the present embodiment, described blending tank 4 is provided with the first pore 3-1, the second pore 3-2, cold air mouth and steam mouth, with reference to Fig. 1, wherein, first pore 3-1 is input hole, connects the detachable connection of pipeline of liquid nitrogen bottle 1 on this input hole, and the second pore 3-2 connects outside air, and the second pore 3-2 place is provided with valve, for controlling the discrepancy of gas in blending tank。
It is understood that during original state, the second pore 3-2 on blending tank 4 is in communication with the outside, it is ensured that possess the air of q.s under room temperature state in blending tank 4；Afterwards, close the second pore 3-2, in blending tank 4, liquid nitrogen is poured by the first pore 3-1, liquid nitrogen, entering into after in blending tank 4, is converted into nitrogen, thus the heat absorbed in surrounding, reach the purpose of refrigeration, followed by, after cold air is stirred, it is transported to the soft parcel 7 of buffer, or in the soft parcel 8 of wheel。
In the present embodiment, described blending tank 4 being provided with electromagnetic valve 2 on first pore 3-1 and the connecting pipe of liquid nitrogen bottle 1, the purpose of electromagnetic valve 2 is in that the liquid nitrogen controlling in liquid nitrogen bottle 1 flows out。
Soft the superscribing of described buffer is provided with the 3rd pore 3-3 and the four pore 3-4, cold air mouth and the steam mouth of blending tank is connected respectively by the valve being disposed thereon, in like manner, soft the superscribing of wheel is equipped with the 5th pore 3-5 and the six pore 3-6, is connected cold air mouth and the steam mouth of blending tank respectively by the valve being disposed thereon。
It should be noted that the cold air mouth of soft the 3rd pore the 3-3/ the four pore 3-4 superscribed of buffer and blending tank and steam mouth annexation are with reference to Fig. 1, corresponding relation portion limits, such as, 3rd pore 3-3 can connect cold air mouth, and now, the 4th pore 3-4 connects steam mouth, or, 3rd pore 3-3 can connect steam mouth, and now, the 4th pore 3-4 connects cold air mouth, in like manner, equally applicable for wheel soft parcel 8。Refer again to Fig. 1, Article 1, after one end of flexible pipe 9 connects the cold air mouth of blending tank 4, divide two conveyance conduits, deliver gas in the soft parcel of buffer 7 and the soft parcel 8 of wheel respectively, after one end of Article 2 flexible pipe 9 connects the steam mouth of blending tank 4, also two conveyance conduits are divided, deliver gas in the soft parcel of buffer 7 and the soft parcel 8 of wheel respectively, so, in the soft parcel 8 of the soft parcel of buffer 7 or wheel, it is respectively formed closed loop, gas is after the steam mouth of blending tank 4/cold air mouth flows out, through the buffer soft parcel 8 of soft parcel 7/ wheel, cold air mouth/steam mouth further through blending tank 4 flows back to blending tank 4。
It should be noted that the steam mouth place of described blending tank is provided with negative pressure device 10, for drawing the gas in blending tank。It is understandable that, negative pressure device 10 is provided only on the steam mouth port of export, after the gas in blending tank 4 is heated, by negative pressure device 10, steam is drawn into the buffer soft parcel 8 of soft parcel 7/ wheel, blending tank 4 is flowed back to again by the cold air mouth of blending tank 4, without negative pressure device 10, gas can not be circulated。Different is, cold air mouth place need not arrange negative pressure device, when liquid nitrogen is converted to nitrogen, itself there is the function of boosting, after cold air is drained into the buffer soft parcel 8 of soft parcel 7/ wheel by cold air mouth, blending tank 4 domestic demand constantly to manufacture high pressure cold, thus ensureing that cold air is transported in testpieces endlessly。
The present embodiment additionally provides a set of control device and electric device, for this, it is necessary first to be provided with temperature sensor at described first pore, the second pore, the 3rd pore, the 4th pore, the 5th pore and the 6th pore place。
Secondly, the valve at described electromagnetic valve and the second pore, the 3rd pore, the 4th pore, the 5th pore and the 6th pore place is all connected with control system, control system the switch of valve is controlled。
In the present embodiment, electromagnetic valve 2 is a kind of to have the electromagnetic valve with digital displaying function, and temperature sensor has the measurement function from-100 DEG C～200 DEG C。The soft parcel of pressurized strut 7 and the soft parcel of wheel 8 are customized according to actual tests part size, and the special silicone rubber that its material is temperature resistant range-90 DEG C～200 DEG C is made。
Described controller is PID controller, it is also connected with described temperature sensor, above-mentioned valve is carried out on-off control by the temperature that PID transmits automatically according to temperature sensor, the a certain pore of the soft parcel of such as wheel 8 detects that temperature is not reaching to intended low temperature, now, need to open electromagnetic valve, in blending tank 4, inject liquid nitrogen。
In the present invention, when needs carry out low-temperature test, desired value is cooled the temperature to by the liquid-gas ratio example controlling to inject in blending tank, close electromagnetic valve, gas liquid mixture after regulating is injected in the soft soft parcel of parcel/wheel of buffer, and gas liquid mixture is uniformly injected into the air channel athwartship plane on buffer/wheel, make buffer/tire air temperature gradually reduce, reach desired value, thus inside working chamber reaches uniform decrease in temperature purpose。When needs carry out hot test, by adding heat pipe, gas is heated, due to the heated rear volumetric expansion of air, pressure in blending tank is also with to raising, it is transported in soft parcel by flexible pipe, makes the temperature of testpieces raise, and produce loop by another flexible pipe, constitute uninterrupted temperature circulatory system, keep the uniformity of temperature。
Said apparatus has also been carried out enclosure designs and processing by the present embodiment, make packaged type testing equipment, liquid nitrogen bottle and blending tank are respectively divided into two regions, newly-increased electrical areas and control area simultaneously, liquid nitrogen bottle connects with blending tank, and it is integrated that the valve on both carries out circuit according to above-mentioned control principle, storE in electrical areas, and the control equipment in control area, Electricity Federation, finally four subregions are assembled into a moveable equipment, described device bottom is provided with castor and/or a spike。
Carried out the high-low-temperature environmental testing of landing gear drop test by device provided by the invention and the mode that carries out freezing or heat, simple and easy to do, control accuracy is high, and result is stable。
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit。Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme。
Claims (9)
1. the high-low-temperature environmental testing device for landing gear drop test, it is characterized in that: include liquid nitrogen bottle (1), blending tank (4), heating rod (5), magnet fluid sealing agitator (6), the soft parcel of buffer (7) and the soft parcel of wheel (8), wherein
Blending tank (4), is used for mixing gas；
Liquid nitrogen bottle (1), connects blending tank (4), for input liquid nitrogen in blending tank (4)；
Heating rod (5), is arranged in described blending tank (4), for the gas in described blending tank (4) is heated；
Magnet fluid sealing agitator (6), is arranged in described blending tank (4), for the gas in described blending tank (4) is stirred；
The soft parcel of buffer (7), wraps up buffer, and connects described blending tank (4) by two flexible pipes (9)；
The soft parcel of wheel (8), wraps up wheel, and connects described blending tank (4) by two flexible pipes (9)。
2. the high-low-temperature environmental testing device for landing gear drop test as claimed in claim 1, it is characterized in that: described blending tank (4) is provided with the first pore (3-1), the second pore (3-2), cold air mouth and steam mouth, first pore (3-1) is input hole, connect the detachable connection of pipeline of liquid nitrogen bottle (1) on this input hole, second pore (3-2) connects outside air, and the second pore (3-2) place is provided with valve, it is used for controlling the discrepancy of blending tank (4) interior gas。
3. the high-low-temperature environmental testing device for landing gear drop test as claimed in claim 2, it is characterised in that: upper first pore (3-1) of described blending tank (4) and the connecting pipe of liquid nitrogen bottle (1) are provided with electromagnetic valve (2)。
4. the high-low-temperature environmental testing device for landing gear drop test as claimed in claim 3, it is characterized in that: the soft parcel of described buffer (7) is provided with the 3rd pore (3-3) and the 4th pore (3-4), connected cold air mouth and the steam mouth of blending tank (4) by the valve being disposed thereon respectively。
5. the high-low-temperature environmental testing device for landing gear drop test as claimed in claim 4, it is characterized in that: the soft parcel of wheel (8) is equipped with the 5th pore (3-5) and the 6th pore (3-6), connected cold air mouth and the steam mouth of blending tank (4) by the valve being disposed thereon respectively。
6. the high-low-temperature environmental testing device for landing gear drop test as claimed in claim 5, it is characterized in that: the steam mouth place of described blending tank (4) is provided with negative pressure device (10), be used for drawing the gas in blending tank (4)。
7. the high-low-temperature environmental testing device for landing gear drop test as claimed in claim 6, it is characterised in that: described first pore (3-1), the second pore (3-2), the 3rd pore (3-3), the 4th pore (3-4), the 5th pore (3-5) are provided with temperature sensor with the 6th pore (3-6) place。
8. the high-low-temperature environmental testing device for landing gear drop test as claimed in claim 7, it is characterized in that: the valve at described electromagnetic valve (2) and the second pore (3-2), the 3rd pore (3-3), the 4th pore (3-4), the 5th pore (3-5) and the 6th pore (3-6) place is all connected with control system, control system the switch of valve is controlled。
9. the high-low-temperature environmental testing device for landing gear drop test as claimed in claim 8, it is characterised in that: described controller is PID controller, and it is also connected with described temperature sensor。
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| CN201610149656.9A CN105699039B (en) | 2016-03-16 | 2016-03-16 | A kind of high-low-temperature environmental testing device for landing gear drop test |
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| CN201610149656.9A CN105699039B (en) | 2016-03-16 | 2016-03-16 | A kind of high-low-temperature environmental testing device for landing gear drop test |
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| CN105699039B CN105699039B (en) | 2019-02-26 |
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| CN106091358A (en) * | 2016-07-25 | 2016-11-09 | 东莞中子科学中心 | A kind of heater for cryogen and application thereof |
| CN108195539A (en) * | 2017-11-13 | 2018-06-22 | 南京航空航天大学 | A kind of experimental rig for being used to study helicopter blade droop stop |
| CN111232242A (en) * | 2020-02-28 | 2020-06-05 | 南京航空航天大学 | Aircraft landing gear buffer ultimate working temperature drop test device and test method thereof |
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| CN111232242B (en) * | 2020-02-28 | 2022-10-11 | 南京航空航天大学 | Aircraft landing gear buffer ultimate working temperature drop test device and test method thereof |
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Application publication date: 20160622 Assignee: CHINA AERO-POLYTECHNOLOGY EST Assignor: CHINA HELICOPTER RESEARCH AND DEVELOPMENT INSTITUTE Contract record no.: X2021990000154 Denomination of invention: A high and low temperature environment test device for landing gear drop test Granted publication date: 20190226 License type: Common License Record date: 20210315 |
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