CN116754164A - Self-adaptive adjustable lift force simulation device - Google Patents

Self-adaptive adjustable lift force simulation device Download PDF

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Publication number
CN116754164A
CN116754164A CN202310733621.XA CN202310733621A CN116754164A CN 116754164 A CN116754164 A CN 116754164A CN 202310733621 A CN202310733621 A CN 202310733621A CN 116754164 A CN116754164 A CN 116754164A
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CN
China
Prior art keywords
air
piston
tank
inner cylinder
gas tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310733621.XA
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Chinese (zh)
Inventor
刘小川
陈熠
张飞
杨正权
胡锐
薛云芳
杨建波
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AVIC Aircraft Strength Research Institute
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AVIC Aircraft Strength Research Institute
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Publication date
Application filed by AVIC Aircraft Strength Research Institute filed Critical AVIC Aircraft Strength Research Institute
Priority to CN202310733621.XA priority Critical patent/CN116754164A/en
Publication of CN116754164A publication Critical patent/CN116754164A/en
Pending legal-status Critical Current

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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
    • G01M7/02—Vibration-testing by means of a shake table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/60—Testing or inspecting aircraft components or systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Transportation (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Actuator (AREA)

Abstract

The application belongs to the technical field of landing gear drop tests, and particularly relates to a self-adaptive adjustable lift force simulation device. The device comprises a gas tank (1), an inner cylinder (2), a piston (3), a piston rod (4), a flexible air bag (5) and a small air chamber (6); the inner cylinder (2) is fixed in the gas tank (1), the piston (3) is positioned in the inner cylinder (2), the inner cylinder (2) below the piston (3) is communicated with the inner cavity of the gas tank (1), and a piston rod penetrates through the gas tank (1) of the inner cylinder (2) and is connected with the test body (15) outside the gas tank (1) through an elastic connecting piece (14); the small air chamber (6) is connected to the outer side of the air tank (1) and is connected with the inner cavity of the air tank (1), the flexible air bag (5) is positioned in the small air chamber (6), the flexible air bag (5) is provided with an air bag exhaust valve (8), and the flexible air bag (5) is connected with the air tank (1) by an air source (10). The application can obviously improve the lift simulation accuracy in landing gear drop test and aircraft complete machine drop test.

Description

Self-adaptive adjustable lift force simulation device
Technical Field
The application belongs to the technical field of landing gear drop tests, and particularly relates to a self-adaptive adjustable lift force simulation device.
Background
During the landing process of the aircraft, the aircraft is leveled and landed in a flat manner by continuously reducing the speed and the height when the aircraft finally approaches the runway, so that the lifting force acting on the aircraft and the gravity of the aircraft are basically balanced at the moment of landing gear wheel landing. For civil and military aircraft, landing gear drop test or aircraft full-aircraft drop test is an important test for verifying the cushioning performance of a landing gear, and is a key verification subject for ensuring the landing safety of an aircraft.
Landing gear drop tests can use both the reduced mass method (by reducing part of the equivalent mass, subtracting the work done by the lift during buffering) and the direct lift simulation method to introduce the effects of lift. The full-aircraft drop test has no method for reducing the mass, and only a lift force simulation device can be used for simulating the influence of actual distributed aerodynamic lift force by applying lift force to a small number of engine body structural parts.
The lift simulation device is divided into two types, namely a split type lift simulation device and an integral type lift simulation device, the split type lift simulation device mainly comprises an air storage chamber, a cylinder body, a piston, a force sensor and the like, the piston is connected with the air storage chamber through a vent pipe, and the split type lift simulation device is generally fixedly installed on the ground and can only be used in landing gear drop test. The integral lift simulation device mainly comprises an air storage chamber, a cylinder body, an air circuit, a piston, a pull rod, a force sensor and the like, wherein the air storage chamber and the cylinder body are generally integrated together, can be fixed on the ground, can be hung and installed on a bearing frame, and can be used in landing gear drop tests and aircraft full-aircraft drop tests.
The lift force of the airplane is directly related to the flying speed and the flying attitude of the airplane, and the lift force output by the traditional lift force simulation device is related to the area of the piston and the pressure of the air tank, and is basically unchanged and slightly increased in the test process. However, as the aircraft's flight speed decreases, the lift force also decreases, and thus should provide a continuously smaller simulated lift force when performing the simulation test.
Disclosure of Invention
In order to solve at least one of the technical problems, the application designs the self-adaptive adjustable lift force simulation device so as to better simulate the stress conditions of the landing gear and the whole aircraft in the test process.
The application provides a self-adaptive adjustable lift force simulation device which mainly comprises a gas tank, an inner cylinder, a piston rod, a flexible airbag and a small air chamber;
the piston rod is positioned in the second cavity, one end of the piston rod is connected with the piston, and the other end of the piston rod penetrates through the inner cylinder and then is connected with the test body outside the air cylinder through an elastic connecting piece;
the small air chamber is connected to the outer side of the air tank and connected with the inner cavity of the air tank through the vent hole, the flexible air bag is positioned in the small air chamber and provided with an air bag exhaust valve, and the flexible air bag and the air tank are connected with an air source through pipelines.
Preferably, the piston is provided with a displacement sensor.
Preferably, the inner cylinder is connected with the upper inner wall and the lower inner wall of the gas tank through flanges respectively.
Preferably, a hanging device is arranged at the upper end of the gas tank.
Preferably, one end of the elastic connecting piece is connected with the piston rod through a pull ring, and the other end of the elastic connecting piece is connected with the test body through a bolt.
Preferably, the small air chamber is welded to the air tank.
Preferably, the small air cells include a plurality of small air cells surrounding the circumferential side of the air tank.
Preferably, the flexible bladder is bonded on one side to the small air chamber.
According to the application, the available volume of the gas tank is regulated, and the pressure of the gas in the gas tank is controlled, so that the simulated lift output by the lift simulating device can be regulated along with the compression stroke of the landing gear, and the lift simulation accuracy in landing gear drop test and aircraft complete machine drop test can be remarkably improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a device according to a preferred embodiment of the adaptive lift simulator of the present application.
The device comprises a 1-gas tank, a 2-inner cylinder, a 3-piston, a 4-piston rod, a 5-flexible gas bag, a 6-small gas chamber, a 7-gas bag gas inlet valve, an 8-gas bag gas outlet valve, a 9-gas tank gas inlet valve, a 10-gas source, an 11-pressure sensor, a 12-pipeline, a 13-suspension device, a 14-elastic connecting piece, a 15-test body, a 16-displacement sensor and a 17-controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application become more apparent, the technical solutions in the embodiments of the present application will be described in more detail with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the application. The embodiments described below by referring to the drawings are exemplary and intended to illustrate the present application and should not be construed as limiting the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The application provides a self-adaptive adjustable lift force simulation device, which mainly comprises a gas tank 1, an inner cylinder 2, a piston 3, a piston rod 4, a flexible airbag 5 and a small air chamber 6, and is shown in fig. 1;
the piston 3 is positioned in the inner cylinder 2, the piston 3 divides the inner cylinder into a first chamber positioned above and a second chamber positioned below and communicated with the inner cavity of the gas cylinder 1, the piston rod 4 is positioned in the second chamber, one end of the piston rod 4 is connected with the piston 3, and the other end of the piston rod passes through the gas cylinder 1 of the inner cylinder 2 and then is connected with the test body 15 outside the gas cylinder 1 through the elastic connecting piece 14;
the small air chamber 6 is connected to the outer side of the air tank 1 and is connected with the inner cavity of the air tank 1 through an air vent, the flexible air bag 5 is positioned in the small air chamber 6, the flexible air bag 5 is provided with an air bag exhaust valve 8, and the flexible air bag 5 and the air tank 1 are connected with an air source 10 through pipelines.
According to the application, the additional small air chamber 6 is arranged on the air tank 1, the flexible air bag 5 is arranged in the small air chamber 6, the inflation pressure of the flexible air bag 5 and the air tank 1 is the same, when the piston 3 moves, the simulated lift force output by the piston rod 3 is basically constant, when the lift force needs to be regulated down, only the air in the flexible air bag 5 needs to be discharged, at the moment, the volume of the small air chamber 6 is increased, which corresponds to the increase of the available volume of the air tank 1, so that the regulation of the simulated lift force output is realized, and the regulation of the simulated lift force output is realized because the increase of the movement stroke of the piston rod corresponds to the reduction of the flight speed of an airplane.
Specifically, referring to fig. 1, after the adjustable lift force simulation device is fixed, the piston rod is elastically connected with the test body (an airplane or a landing gear), after reliable connection and environmental safety are confirmed, the inflation pressure of the air tank 1 and the flexible air bag 5 is set, the air tank inlet valve 9 and the air bag inlet valve 7 are opened, the air tank 1 and the flexible air bag 5 are inflated through the air source 10, the pressure of the air tank 1 is the same as the pressure of the flexible air bag 5, the real-time inflation pressure is sensed by the pressure sensor 11, and when the inflation pressure reaches the design pressure, each inflation valve is closed.
The test body 15 falls freely, the elastic connecting piece 14 is tensioned, the piston 3 is pulled to move downwards, and the pressure difference at the two ends of the piston 3 generates lifting force and acts on the test body 15. The initial pressure of the system is P0, the initial volume is V0 (including the initial volume of the gas tank and the volume of the second chamber at the lower part of the piston), the effective area of the piston 3 is a (the piston area minus the piston rod area), and the output lift force f=p0×a.
The test body 15 continues to drop and the pressure in the gas tank remains substantially constant (slightly increased) and the simulated lift force acting on the test body remains substantially constant (slightly increased).
According to the application, the air inlet valve 9 of the air tank, the air inlet valve 7 of the air bag and the air outlet valve 8 of the air bag are connected with the controller 17 through control cables, when lift force needs to be regulated, the controller 17 controls to open the air outlet valve 8 of the air bag, so that air in the flexible air bag 5 is rapidly emptied, and high-pressure air of the air tank can enter the small air chamber 6, so that the effective volume of the air tank 1 is increased. The volume of the single flexible balloon 5 is V1. During the movement of the piston, the available volume of the system decreases, then according to the second law of thermodynamics:
P 0 V 0 γ ＝P 1 (V 0 +nV 1 -△V) γ (1)
then
Where γ is the gas polytropic index, n is the number of air pockets, Δv is related to the piston area effective area a and the stroke L, Δv=a×l.
The lift force output at this time becomes f=p1×a.
The available volume of the traditional lift simulation device is reduced along with the increase of the compression stroke, and the increase of working pressure is correspondingly achieved according to the thermodynamic law, so that the actual output simulated lift is increased.
In some alternative embodiments, a displacement sensor 16 is provided on the piston 3. The displacement sensor 16 is connected with the controller 17 through a control cable, the displacement sensor measures the distance of the piston movement, when the movement distance reaches a set value, a control signal is sent to the controller 17, and the controller 17 deflates the flexible air bag 5 according to set logic. In an alternative embodiment, strain gauges may also be provided in the elastic connection 14, the deflation of the flexible bladder 5 being controlled in dependence of the force values fed back by the strain gauges. The deflation control law of the flexible air bag 5 is set in the controller 17 or directly, and the deflation adjustment is carried out according to time.
In some alternative embodiments, the inner cylinder 2 and the upper and lower inner walls of the gas tank 1 are respectively connected through flanges. In this embodiment, referring to fig. 1, the inner cylinder has an open structure, the ends of which are fixed to the upper and lower ends of the gas tank 1 respectively by a flange structure, and form a first chamber and a second chamber which are relatively airtight, but the second chamber is perforated in the side wall so as to be communicated with the gas tank 1, and the piston rod 4 only needs to pass through a wall plate at the bottom of the gas tank 1. In an alternative embodiment, the inner cylinder 2 may also be a cylinder structure fixed in the gas tank 1 and closed up and down, the lower end is also provided with a hole communicated with the gas tank 1, and the piston rod 4 needs to pass through a cover plate at the bottom of the inner cylinder 2 and a wall plate at the bottom of the gas tank 1. It will be appreciated that the piston rod 4 is connected to the wall plate at the bottom of the gas tank 1 by a linear bearing having high tightness.
In some alternative embodiments, the upper end of the gas tank 1 is provided with a suspension device 13. The whole self-adaptive adjustable lift force simulation device is suspended on a bearing frame through a suspension device 13. In an alternative embodiment, the body of the gas tank 1 of the simulation device may also be fixed by means of a mounting bracket.
In some alternative embodiments, one end of the elastic connecting piece 14 is connected with the piston rod 4 through a pull ring, and the other end is connected with the test body 15 through a bolt.
The elastic connection member 14 of this embodiment may be a high-strength spring structure, or may be a hydraulic device similar to a vibration isolator, that is, a high-elasticity device composed of fluid and/or rubber, the elastic connection member 14 has an upper part and a lower part that are relatively damped to move, the upper part may be mounted on the bottom of the piston rod 4 through a pull ring, and a housing portion of the lower part may be screwed to the test body 15.
In some alternative embodiments, the small air chamber 6 is welded to the air tank 1. As shown in fig. 1, in this embodiment, the small air chamber 6 and the air tank 1 can form a closed cavity together by forming a vent hole at the welding position, and in an alternative embodiment, the small air chamber 6 can exist independently and be connected with the air tank 1 through an air pipe.
In some alternative embodiments, the small air chamber 6 includes a plurality of small air chambers, which surround the circumferential side of the air tank 1. In this embodiment, the number of small air chambers 6 and flexible air bags 5 is increased, so that the available volume can be adjusted more preferably, it is understood that the number of flexible air bags 5 is not necessarily the same as that of small air chambers 6, more preferably, each small air chamber 6 has a plurality of flexible air bags 5 therein, and the air bag exhaust valve 8 of the flexible air bag 5 is controlled by the controller 17 in a linkage manner.
In some alternative embodiments, the flexible bladder 5 is bonded on one side to the small air chamber 6. This embodiment serves to ensure that the flexible bladder 5 is relatively fixed within the small air chamber 6, preventing it from deflecting when inflated.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (8)

1. The self-adaptive adjustable lift simulation device is characterized by comprising a gas tank (1), an inner cylinder (2), a piston (3), a piston rod (4), a flexible air bag (5) and a small air chamber (6);
the device comprises an inner cylinder (2), a piston (3), a piston rod (4) and an elastic connecting piece (14), wherein the inner cylinder (2) is fixed in a gas tank (1), the piston (3) is positioned in the inner cylinder (2), the piston (3) divides the inner cylinder into a first chamber positioned above and a second chamber positioned below and communicated with the inner cavity of the gas tank (1), the piston rod (4) is positioned in the second chamber, one end of the piston rod is connected with the piston (3), and the other end of the piston rod passes through the gas tank (1) of the inner cylinder (2) and then is connected with a test body (15) outside the gas tank (1) through the elastic connecting piece (14);
the small air chamber (6) is connected to the outer side of the air tank (1) and is connected with the inner cavity of the air tank (1) through an air vent, the flexible air bag (5) is positioned in the small air chamber (6), the flexible air bag (5) is provided with an air bag exhaust valve (8), and the flexible air bag (5) and the air tank (1) are connected with an air source (10) through pipelines.
2. The self-adaptive adjustable lift simulation device according to claim 1, characterized in that a displacement sensor (16) is arranged on the piston (3).
3. The self-adaptive adjustable lift simulation device according to claim 1, wherein the inner cylinder (2) is connected with the upper inner wall and the lower inner wall of the gas tank (1) through flanges respectively.
4. The self-adaptive adjustable lift simulation device according to claim 1, wherein the upper end of the gas tank (1) is provided with a suspension device (13).
5. The self-adaptive adjustable lift simulation device according to claim 1, wherein one end of the elastic connecting piece (14) is connected with the piston rod (4) through a pull ring, and the other end is connected with the test body (15) through a bolt.
6. The self-adaptive adjustable lift simulation device according to claim 1, characterized in that the small air chamber (6) is welded with the air tank (1).
7. The self-adaptive adjustable lift simulation device according to claim 1, characterized in that the small air chambers (6) comprise a plurality of small air chambers which surround the circumference of the air tank (1).
8. The self-adaptive adjustable lift simulation device according to claim 1, wherein the flexible air bag (5) is bonded on one side with the small air chamber (6).
CN202310733621.XA 2023-06-20 2023-06-20 Self-adaptive adjustable lift force simulation device Pending CN116754164A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310733621.XA CN116754164A (en) 2023-06-20 2023-06-20 Self-adaptive adjustable lift force simulation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310733621.XA CN116754164A (en) 2023-06-20 2023-06-20 Self-adaptive adjustable lift force simulation device

Publications (1)

Publication Number Publication Date
CN116754164A true CN116754164A (en) 2023-09-15

Family

ID=87952871

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310733621.XA Pending CN116754164A (en) 2023-06-20 2023-06-20 Self-adaptive adjustable lift force simulation device

Country Status (1)

Country Link
CN (1) CN116754164A (en)

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