Small-load pneumatic ejection separation test platform and speed projection engineering estimation method

Abstract

The invention relates to a small-load pneumatic ejection separation test platform and a speed projection engineering estimation method. The test platform is composed of an air compressor, a high-pressure gas cylinder, an electromagnetic valve, a pressure gauge, a mounting rack, an ejection cylinder, a piston, a high-speed camera, a grid background plate, an irradiation lamp, a protection pad and other components. The air compressor is used for providing high-pressure gas required by the ejection system; the high-pressure gas cylinder is used for storing high-pressure gas required by system ejection; the electromagnetic valve is used for controlling the ejection device to start; the pressure gauge is used for measuring gas pressure in the gas cylinder; the ejection cylinder is used for providing a space required by high-pressure gas expansion and a track required by object ejection; the piston is used for converting aerodynamic force into thrust to provide acceleration for a separated object; the grid background plate is used for determining the position of the isolate shadow; and the irradiation lamp is used for irradiating the separated object and projecting a shadow on the square background plate. The device has the advantages of being safe in experiment, easy to install, convenient to recycle, convenient to maintain and capable of repeating the experiment.

Description

Technical Field

[0001] This invention relates to the field of ejection devices for separate emergency data recording systems, and in particular to a small-load pneumatic ejection separation test platform and a velocity projection engineering estimation method. Background Technology

[0002] With the development of the civil aviation industry, the number of civil aviation passenger plane crashes due to mechanical failures and other reasons is increasing. Search and rescue, accident investigation, and flight data recording technologies hold a unique position in the field of civil aviation safety. These technologies can save passenger lives as much as possible when an accident occurs, and can also analyze the causes of the accident in a timely manner, resolve potential hazards, and prevent the next accident from happening due to the same reasons. However, when an accident occurs at sea, the search and rescue operation becomes extremely difficult. If a civil aviation passenger plane crashes into the sea, its wreckage may sink to the deep sea. According to maritime air crash rescue practices, traditional flight data recorders have problems such as being difficult to retrieve in the deep sea, underwater signal interference, and limited battery life, which greatly increases the cost of search and rescue and salvage. The detachable flight data recorder currently being researched ejects the flight data recorder before the aircraft crashes, preventing the flight data recorder from falling to the seabed with the aircraft, being damaged or lost, and facilitating the salvage and search work of search and rescue personnel.

[0003] This invention relates to a small-load pneumatic catapult separation test platform and a velocity projection engineering estimation method. Before the equipment is installed and used, testing is required. The velocity projection estimation method is used to calculate the velocity of the separated object. This invention experimentally optimizes the performance parameters of the designed small-load pneumatic catapult separation test platform. Summary of the Invention

[0004] The purpose of this invention is to provide a small-load pneumatic catapult separation test platform that is easy to assemble, convenient to operate, easy to recycle, and can be repeatedly tested.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A small-load pneumatic ejection separation test platform, the test platform includes an air compressor, a high-pressure gas cylinder, a solenoid valve, a DC power supply, a pressure gauge, a mounting bracket, an ejection tube, a piston, a plastic tube, a protective pad, a grid background board, a high-speed camera, and an illumination lamp;

[0007] The mounting bracket is used to fix the catapult, which provides the space required for the expansion of high-pressure gas and the track required for the ejection of the object. The catapult is connected to a plastic tube, which connects the catapult, the gas cylinder, and the solenoid valve in sequence as a flow pipe for high-pressure gas.

[0008] The air compressor is used to provide the high-pressure gas required by the catapult system; the air compressor is connected to a high-pressure gas cylinder, which is used to store the high-pressure gas required for the system's catapult launch.

[0009] The grid background plate is located in front of the catapult and is used to display the projection obtained by the illumination lamp illuminating the separated object, determine the position of the shadow of the separated object, and thus measure the speed of the separated object.

[0010] The illumination lamp is used to illuminate the separated object and project its shadow onto the checkered background board;

[0011] The high-speed camera is used to capture the projection of an object onto a grid background and to obtain the time of the object's displacement.

[0012] Furthermore, the ejection system includes a piston, a bottom cover, and an anti-throw rope; the piston is used to convert aerodynamic force into thrust to provide acceleration for the separated object.

[0013] Furthermore, the solenoid valve is installed on the Sujiao pipeline to control the timing of high-pressure gas flowing into the catapult through the plastic pipe to control the activation of the catapult device; the solenoid valve is powered by a DC power supply.

[0014] Furthermore, the high-pressure gas cylinder is used to store the high-pressure gas provided by the air compressor, and the high-pressure gas cylinder is connected to the pressure gauge through a pipe, the pressure gauge being used to measure the pressure of the high-pressure gas.

[0015] Furthermore, a protective pad is provided on the ground at a right angle to the grid plate in the direction of the ejection tube exit. The protective pad is a preventive measure taken to protect the separated object from falling to the ground and causing damage.

[0016] Furthermore, the air compressor is connected to the inflation port via an inflation hose. The inflation port is located at the gas inlet of the high-pressure gas cylinder and is used to compress air to provide the high-pressure gas required by the catapult system.

[0017] Furthermore, the high-pressure gas cylinder is connected to the solenoid valve through the plastic tube, and the high-pressure gas in the high-pressure gas cylinder flows into the ejection tube through the plastic tube and the solenoid valve to fully expand and complete the ejection.

[0018] Furthermore, the ejection tube is connected to the bottom cover via threads, and the bottom cover of the ejection tube is connected to the piston via a bolt with holes and to the anti-throw rope. Two felt gaskets are installed in the groove of the piston to increase the airtightness of the ejection system. The piston is tangent to the inner wall of the ejection tube. After the high-pressure gas in the high-pressure gas cylinder flows into the space between the bottom cover of the ejection tube and the piston, the gas expands rapidly and pushes the piston. The piston is used to convert the aerodynamic force into thrust to provide acceleration for the separated object. The object is ejected under the push of the piston.

[0019] Based on the above-mentioned small-load pneumatic ejection separation test platform, this application also provides a velocity projection engineering estimation method. The estimation method is based on the small-load pneumatic ejection separation test platform described in claim 1. After the separated object is ejected from the ejection tube, the object performs projectile motion in an area with a grid as the background. Under the action of the illumination lamp, the separated object displays a shadow on the grid background. The velocity of the object can be calculated by recording the time and the distance the shadow moves using a high-speed camera.

[0020] Furthermore, the velocity projection engineering estimation method is used to calculate the velocity of the separated object:

[0021] (1)

[0022] (2)

[0023] From equations (1) and (2) above, we get , ;

[0024] in, is the horizontal displacement of the separated object; is the horizontal displacement of the projection of the separated object, which can be measured using a grid background board; The vertical displacement of the separated object; The vertical displacement of the projected object can be measured using a grid background board; The distance between the checkered background board and the catapult; The distance between the spotlight and the catapult

[0025] (3)

[0026] (4)

[0027] in, It is the shooting interval of the high-speed camera, which is calculated from the frame rate of the high-speed camera; The horizontal velocity of the separated material; denoted as , where is the vertical velocity of the separated material.

[0028] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects: The air compressor of the present invention compresses and stores air into a high-pressure gas cylinder. When the pressure of the gas in the high-pressure gas cylinder reaches the expected value, the DC power switch connected to the solenoid valve is turned on, the solenoid valve opens, and the high-pressure gas flows into the ejection tube. The high-pressure gas expands and pushes the piston to move, ejecting the object. The displacement of the shadow of the separated object is captured by a high-speed camera, and the number of frames captured by the high-speed camera is used to calculate the movement speed of the shadow of the separated object, thereby calculating the ejection speed of the separated object. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is an operation flowchart of the pneumatic catapult mechanism provided in an embodiment of the present invention;

[0031] Figure 2 A three-dimensional view of the pneumatic catapult test platform provided in an embodiment of the present invention;

[0032] Figure 3 The component installation and connection diagram of the pneumatic catapult mechanism provided in the embodiment of the present invention;

[0033] Figure 4 A cross-sectional view of the main components of the pneumatic catapult mechanism provided in an embodiment of the present invention;

[0034] Figure 5 A front view of the mounting bracket provided in an embodiment of the present invention;

[0035] Figure 6 A side view of the mounting bracket provided in an embodiment of the present invention;

[0036] Figure 7 A top view of the mounting bracket provided in an embodiment of the present invention;

[0037] Figure 8 A front view of the velocity projection estimation method provided in an embodiment of the present invention;

[0038] Figure 9 A side view of the velocity projection estimation method provided in an embodiment of the present invention;

[0039] Figure 10 A top view of the velocity projection estimation method provided in an embodiment of the present invention;

[0040] Figure 11 Installation diagram of the bolt with holes and the anti-throw rope provided in the embodiment of the present invention;

[0041] 1. Air compressor; 2. Mounting bracket; 3. High-speed camera; 4. Illumination lamp; 5. Protective pad; 6. Checkered background board; 7. Ejection system; 8. High-pressure gas cylinder; 9. Gas cylinder mounting pad; 10. Inflation interface; 11. Pressure gauge; 12. DC power supply; 13. Plastic hose; 14. Solenoid valve; 15. Bolt with hole; 16. Anti-throw rope; 17. Protective ring; 18. Separated object; 19. Ejection tube; 20. Ejection tube mounting pad; 21. Piston; 22. Washer; 23. Bottom cover; 24. Aluminum profile; 25. Triangular anti-slip block; 26. Mounting plate; 27. Separated object center; 28. Object projection; 29. ​​Object projection center; 30. Aluminum buckle. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1:

[0045] This application relates to a small-load pneumatic ejection separation test platform, which includes an air compressor, a high-pressure gas cylinder, a solenoid valve, a DC power supply, a pressure gauge, a mounting bracket, an ejection tube, a piston, a plastic tube, a protective pad, a grid background board, a high-speed camera, and an illumination lamp.

[0046] The mounting bracket is used to fix the catapult, which provides the space required for the expansion of high-pressure gas and the track required for the ejection of the object. The catapult is connected to a plastic tube, which connects the catapult, the gas cylinder, and the solenoid valve in sequence as a flow pipe for high-pressure gas.

[0047] The air compressor is used to provide the high-pressure gas required by the catapult system; the air compressor is connected to a high-pressure gas cylinder, which is used to store the high-pressure gas required for the system's catapult launch.

[0048] The grid background plate is located in front of the catapult and is used to display the projection obtained by the illumination lamp illuminating the separated object, determine the position of the shadow of the separated object, and thus measure the speed of the separated object.

[0049] The illumination lamp is used to illuminate the separated object and project its shadow onto the checkered background board;

[0050] The high-speed camera is used to capture the projection of an object onto a grid background and to obtain the time of the object's displacement.

[0051] Furthermore, the ejection system includes a piston, a bottom cover, and an anti-throw rope; the piston is used to convert aerodynamic force into thrust to provide acceleration for the separated object.

[0052] Furthermore, the solenoid valve is installed on the Sujiao pipeline to control the timing of high-pressure gas flowing into the catapult through the plastic pipe to control the activation of the catapult device; the solenoid valve is powered by a DC power supply.

[0053] Furthermore, the high-pressure gas cylinder is used to store the high-pressure gas provided by the air compressor, and the high-pressure gas cylinder is connected to the pressure gauge through a pipe, the pressure gauge being used to measure the pressure of the high-pressure gas.

[0054] Furthermore, a protective pad is provided on the ground at a right angle to the grid plate in the direction of the ejection tube exit. The protective pad is a preventive measure taken to protect the separated object from falling to the ground and causing damage.

[0055] Furthermore, the air compressor is connected to the inflation port via an inflation hose. The inflation port is located at the gas inlet of the high-pressure gas cylinder and is used to compress air to provide the high-pressure gas required by the catapult system.

[0056] Furthermore, the high-pressure gas cylinder is connected to the solenoid valve through the plastic tube, and the high-pressure gas in the high-pressure gas cylinder flows into the ejection tube through the plastic tube and the solenoid valve to fully expand and complete the ejection.

[0057] Furthermore, the ejection tube is connected to the bottom cover via threads, and the bottom cover of the ejection tube is connected to the piston via a bolt with holes and to the anti-throw rope. Two felt gaskets are installed in the groove of the piston to increase the airtightness of the ejection system. The piston is tangent to the inner wall of the ejection tube. After the high-pressure gas in the high-pressure gas cylinder flows into the space between the bottom cover of the ejection tube and the piston, the gas expands rapidly and pushes the piston. The piston is used to convert the aerodynamic force into thrust to provide acceleration for the separated object. The object is ejected under the push of the piston.

[0058] Figure 1 For an operational flowchart of the pneumatic catapult mechanism provided in an embodiment of the present invention, please refer to [link / reference]. Figure 1 The specific process of the small-load pneumatic ejection separation test platform provided in this embodiment is as follows: when high-pressure gas is stored to... Figure 3 After the high-pressure gas cylinder 8, observe Figure 3 Pressure gauge 11 is activated when the high-pressure gas pressure reaches the expected value. Figure 3 DC power switch 12, Figure 3 The solenoid valve 14 is opened.Figure 3 High-pressure gas in high-pressure cylinder 8 passes through Figure 3 The plastic tube 13 flows into Figure 3 In the catapult 19, high-pressure gas is in Figure 3 The bottom of the catapult 19 expands. Figure 3 The piston 21 is pushed by the work done by the expansion of high-pressure gas. Figure 3 Separated object 18 in Figure 2 The ejection tube 19 moves its muzzle and then ejects the object. Figure 3 Irradiation lamp 4 in the middle Figure 2 The separated object 18 in the middle projects the shadow of the separated object onto... Figure 2 On the Chinese background board 6, Figure 2 The high-speed camera 3 captured the shadow of the separated material in Figure 2 The displacement trajectory on the grid background board 6 in the middle, according to Figure 3 The high-speed camera 3 captured the interval frames, and the moving speed of the separated object's shadow was calculated using the velocity projection estimation method, thereby estimating the... Figure 3 Separated object 18 in Figure 3 The speed at which the catapult 19 is launched.

[0059] The specific connection diagram of the small-load pneumatic ejection separation test platform in this embodiment is as follows: Figure 3 As shown, in this embodiment, Figure 3 The high-pressure gas cylinder 8 is connected to the pressure gauge 11 via an iron pipe, such as... Figure 3 The high-pressure gas cylinder shown has a cross-shaped pipe at the nozzle, and the filling port 10 is located at... Figure 11 Below, the high-pressure gas cylinder 8, pressure gauge 11, and inflation port 10 are connected to the solenoid valve 14 via a plastic tube 13. The solenoid valve 14 has a power interface at its plug for connecting to a DC power supply 13. The solenoid valve 14 is connected to the launch tube via a pipe. The connection method between the perforated bolt 15 and the anti-throw rope 16 is as follows... ​ As shown, the anti-throw rope 16 passes through the hole of the bolt 15 and is fixed with an aluminum clip 30 (the reason for using an aluminum clip is that aluminum is easy to mold and adjust the length of the anti-throw rope 16, preventing the piston 21 from falling off the cylinder opening during ejection and affecting the ejection). The bolt 15 is threadedly connected to the bottom cover 23 and the piston 21. The washer 22 is fixed in the groove of the piston 21. The protective ring 17 is used to fix the ejection cylinder 19 to prevent the ejection device from moving backward. The protective ring 17 is fixed to the mounting plate 26 with bolts. The separated object 18 is placed in the ejection cylinder 19 and comes into contact with the piston 21.

[0060] Example 2:

[0061] Based on the above-mentioned small-load pneumatic ejection separation test platform, this application also provides a velocity projection engineering estimation method. The estimation method is based on the small-load pneumatic ejection separation test platform described in claim 1. After the separated object is ejected from the ejection tube, the object performs projectile motion in an area with a grid as the background. Under the action of the illumination lamp, the separated object displays a shadow on the grid background. The velocity of the object can be calculated by recording the time and the distance the shadow moves using a high-speed camera.

[0062] As an optional implementation, users can customize the size of the catapult according to the size of the object to be launched, change the air pressure required by the catapult system according to the required launch distance and speed, customize the rated air pressure of the high-pressure gas cylinder according to the required air pressure, and choose the brands of solenoid valves, pressure gauges, air compressors, high-speed cameras, and illumination lamps.

[0063] The effectiveness of the pneumatic catapult experimental platform of the present invention is verified by a specific example below, and the velocity projection estimation method is applied to calculate the velocity of the separated object:

[0064] (1)

[0065] (2)

[0066] From equations (1) and (2) above, we can obtain , .in, The horizontal displacement of the separated material; The horizontal displacement of the projected object can be measured using a grid background board; The vertical displacement of the separated object; The vertical displacement of the projected object can be measured using a grid background board; The distance between the checkered background board and the catapult; This refers to the distance between the illumination lamp and the catapult.

[0067] (3)

[0068] (4)

[0069] in It is the shooting interval of a high-speed camera, which can be calculated from the frame rate of the high-speed camera; The horizontal velocity of the separated material; denoted as , where is the vertical velocity of the separated material.

[0070] The following uses a set of experimental data from this embodiment to illustrate the actual experimental situation:

[0071] The high-pressure gas cylinder has a pressure of 1.5 MPa, the weight of the separated object is 6.5 kg, the high-speed camera captures images at intervals of 0.025 s, and the cylinder volume is 3 L. The horizontal movement distance of the separated object's projection on the grid background is 0.52 m, the vertical movement distance is 0.004 m, the distance between the grid background and the launch tube is 1 m, and the distance between the illumination lamp and the launch tube is 1.2 m. The calculated horizontal velocity of the object is 11.34 m / s. -1 The vertical velocity of the object is 0.87 m / s. -1 .

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0073] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A small-load pneumatic ejection separation test platform, characterized in that, The test platform includes an air compressor, a high-pressure gas cylinder, a solenoid valve, a DC power supply, a pressure gauge, a mounting bracket, a catapult, a piston, a plastic tube, a protective pad, a grid background board, a high-speed camera, and an illumination lamp; The mounting bracket is used to fix the catapult, which provides the space required for the expansion of high-pressure gas and the track required for the ejection of the object. The catapult is connected to a plastic tube, which connects the catapult, the gas cylinder, and the solenoid valve in sequence as a flow pipe for high-pressure gas. The air compressor is used to provide the high-pressure gas required by the catapult system; the air compressor is connected to a high-pressure gas cylinder, which is used to store the high-pressure gas required for the system's catapult launch. The grid background plate is located in front of the catapult and is used to display the projection obtained by the illumination lamp illuminating the separated object, determine the position of the shadow of the separated object, and thus measure the speed of the separated object. The illumination lamp is used to illuminate the separated object and project its shadow onto the checkered background board; The high-speed camera is used to capture the projection of an object onto a grid background and to obtain the time of the object's displacement.

2. The small-load pneumatic ejection separation test platform according to claim 1, characterized in that, The ejection system includes a piston, a bottom cover, and a throw-off rope; the piston is used to convert aerodynamic force into thrust to provide acceleration for the separated object.

3. The small-load pneumatic ejection separation test platform according to claim 1, characterized in that, The solenoid valve is installed on the Sujiao pipeline and is used to control the timing of high-pressure gas flowing into the catapult through the plastic pipe to control the activation of the catapult device; the solenoid valve is powered by a DC power supply.

4. The small-load pneumatic ejection separation test platform according to claim 1, characterized in that, The high-pressure gas cylinder is used to store the high-pressure gas provided by the air compressor. The high-pressure gas cylinder is connected to the pressure gauge through a pipe. The pressure gauge is used to measure the pressure of the high-pressure gas.

5. The small-load pneumatic ejection separation test platform according to claim 1, characterized in that, The protective pad is installed on the ground at a right angle to the grid plate in the direction of the catapult exit. The protective pad is a preventive measure to protect the separated object and prevent it from falling to the ground and causing damage.

6. The small-load pneumatic ejection separation test platform according to claim 1, characterized in that, The air compressor is connected to the inflation port via an inflation hose. The inflation port is located at the gas inlet of the high-pressure gas cylinder and is used to compress air to provide the high-pressure gas required by the catapult system.

7. The small-load pneumatic ejection separation test platform according to claim 4, characterized in that, The high-pressure gas cylinder is connected to the solenoid valve through the plastic tube. The high-pressure gas in the high-pressure gas cylinder flows into the ejection tube through the plastic tube and the solenoid valve, and expands fully to complete the ejection.

8. A small-load pneumatic ejection separation test platform according to claim 2, characterized in that, The ejection tube is connected to the bottom cover by threads. The bottom cover of the ejection tube is connected to the piston and the anti-throw rope by bolts with holes. Two felt gaskets are installed in the groove of the piston to increase the airtightness of the ejection system. The piston is tangent to the inner wall of the ejection tube. After the high-pressure gas in the high-pressure gas cylinder flows into the space between the bottom cover of the ejection tube and the piston, the gas expands rapidly and pushes the piston. The piston is used to convert the aerodynamic force into thrust to provide acceleration for the separated object. The object is ejected under the push of the piston.

9. A velocity projection engineering estimation method, characterized in that, The estimation method is based on a small-load pneumatic ejection separation test platform as described in claim 1. After the separated object is ejected from the ejection tube, the object undergoes projectile motion in an area with a grid as the background. Under the action of the illumination lamp, the separated object displays a shadow on the grid background. The speed of the object can be calculated by recording the time and the distance the shadow moves using a high-speed camera.

10. The velocity projection engineering estimation method according to claim 9, characterized in that, The velocity projection engineering estimation method is used to calculate the velocity of the separating object: （1） （2） From equations (1) and (2) above, we obtain , ; in, The horizontal displacement of the separated material; The horizontal displacement of the projected object can be measured using a grid background board; The vertical displacement of the separated object; The vertical displacement of the projected object can be measured using a grid background board; The distance between the checkered background board and the catapult; The distance between the spotlight and the catapult; （3） （4） in, It is the shooting interval of the high-speed camera, which is calculated from the frame rate of the high-speed camera; The horizontal velocity of the separated material; denoted as , where is the vertical velocity of the separated material.

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