A wind tunnel test gas-magnetic coupling delivery device

Abstract

This invention relates to a wind tunnel testing gas-magnetic coupling delivery device, mainly comprising a quick connector, a cylinder, a launch frame, a fiber optic sensor, an electromagnetic locking structure, an electromagnetic compensation structure, a permanent magnet, and a delivery object. A piston is located inside the cylinder and can slide up and down within it. The bottom of the piston rod is connected to the launch frame, which has an electromagnetic locking structure and an electromagnetic compensation structure at its bottom. The permanent magnet is located below the electromagnetic compensation structure and fixed within the delivery object. This invention uses electromagnetic force to lock and release the delivery object, utilizes the cylinder as the main power source for delivery, introduces a fiber optic sensor to monitor delivery parameters during delivery, and simultaneously uses an electromagnetic field to compensate for the delivery object's velocity, forming a gas-magnetic coupling ejection feedback loop to improve the accuracy of initial delivery parameters during the delivery process.

Description

Technical Field

[0001] This invention belongs to the field of experimental aerodynamics and relates to a wind tunnel test air-magnetic coupling delivery device. Background Technology

[0002] Wind tunnel drop testing is an important tool for studying the safety of dropped object separation. It is a non-steady testing technique based on kinematic similarity theory and has significant advantages in studying drop separation characteristics. Therefore, researching high-precision wind tunnel drop testing techniques to predict drop separation trajectories through wind tunnel testing is of great importance.

[0003] Currently, wind tunnel deployment tests primarily utilize deployment mechanisms that employ mechanical connections or ropes to tension or release the deployed object. Release requires multiple mechanical connections to unlock or the ropes to be cut, leading to asynchronous unlocking of these connections. Furthermore, existing deployment mechanisms lack speed compensation, necessitating parameter adjustments through multiple trials to achieve the required speed. This results in poor mechanism synchronization, poor test repeatability, and low precision in controlling deployment speed and angular velocity. These issues contribute to insufficient accuracy of test data, reducing its relevance and impacting researchers' assessment of safety boundaries in real-world deployment processes, potentially causing significant accidents and losses. Additionally, they result in low test success rates, leading to substantial economic losses.

[0004] Therefore, researching a new type of wind tunnel deployment test device can help improve the accuracy of deployment test data and is of great significance to the simulation capability of wind tunnel deployment tests. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a wind tunnel test gas-magnetic coupling delivery device to solve the problem of asynchronous release of the delivery unlocking mechanism and to compensate for the delivery speed of the delivery object in order to improve the accuracy of the delivery test data.

[0006] The solution of the present invention is: a wind tunnel test gas-magnetic coupling delivery device, including a quick connector, a cylinder, a catapult, an electromagnetic locking structure, and an electromagnetic compensation structure;

[0007] The cylinder has N piston holes inside, which are matched with piston rods. The lower end of the piston rod is fixed to the upper end face of the catapult. The cylinder has an air inlet groove inside, which is connected to the top of the N piston holes. A quick connector is connected to the piston holes through the air inlet groove. When the air inlet groove is ventilated, the piston rod moves downward, which drives the catapult to move downward.

[0008] The electromagnetic locking structure is connected to the middle of the lower end face of the catapult. When the electromagnetic locking structure is energized, it generates electromagnetic force to attract the object and lock it under the catapult frame. After the air inlet is ventilated, the electromagnetic locking structure is de-energized, the attraction of the object disappears, and the object is unlocked and released.

[0009] The electromagnetic compensation structure is connected to both ends of the lower end face of the catapult. When energized, it generates an electromagnetic field. By changing the direction of the current, the direction of the electromagnetic force is changed, forming an attractive or repulsive force. By changing the magnitude of the current, the magnitude of the electromagnetic force is changed, thus correcting the speed of the catapult; N≥1.

[0010] Furthermore, the electromagnetic locking structure includes an aluminum alloy pad, a first iron core, and two first coils;

[0011] An aluminum alloy pad is fixedly connected to the middle position of the lower end face of the catapult.

[0012] The first iron core has a U-shaped structure and is installed on the lower end face of the aluminum alloy pad, with the U-shaped opening facing downwards.

[0013] Two first coils are symmetrically distributed about the axis of symmetry of the first iron core, and are wound on the longitudinal part of the U-shaped structure of the first iron core respectively, with opposite directions of rotation.

[0014] Furthermore, the first iron core is made of a soft magnetic material.

[0015] Furthermore, the section where the object is placed and the electromagnetic locking structure engages is made of soft magnetic material.

[0016] Furthermore, the electromagnetic compensation structure comprises M units, where M is an even number greater than 0; each electromagnetic compensation structure comprises a second iron core, a second coil, and a permanent magnet.

[0017] The second iron core is a cylindrical structure with a base connected to the lower end face of the catapult. The second iron core has a cylindrical cavity inside, and a cylindrical section is located in the center of the cavity.

[0018] The second coil is wound on the cylindrical section at the center of the cavity;

[0019] The permanent magnet is fixed inside the object being placed, corresponding to the position of the inner cylindrical section of the second iron core;

[0020] When the second coil of the electromagnetic compensation structure is energized, it generates an electromagnetic field that interacts with the permanent magnet to form a gas-magnetic coupled ejection feedback loop. Depending on the direction of the energizing current, when the magnetic field lines generated by the electromagnetic compensation structure are opposite to the magnetic field lines of the permanent magnet in the interaction region, a repulsive force is generated, increasing the speed of the projected object; when the magnetic field lines generated by the electromagnetic compensation structure are in the same direction as the magnetic field lines of the permanent magnet in the interaction region, an attractive force is generated, decreasing the speed of the projected object.

[0021] Furthermore, the second iron core is made of a soft magnetic material.

[0022] Furthermore, the diameter of the permanent magnet is the same as the diameter of the second iron core cylindrical section.

[0023] Furthermore, it also includes fiber optic sensors for measuring the speed of the catapult as it moves downwards.

[0024] Furthermore, the distance between the quick connector and the intake slots at each end piston hole is equal.

[0025] Furthermore, the cylinder is also equipped with an exhaust groove and an exhaust connector;

[0026] The exhaust groove connects to the bottom of N piston holes and extends from the bottom of the piston holes to the upper part of the cylinder, forming an exhaust circuit; the cylinder side wall has an opening with an exhaust connector, which connects to the exhaust groove; the exhaust groove is vented, and the ejector frame retracts.

[0027] The advantages of this invention compared to the prior art are:

[0028] (1) The wind tunnel test gas-magnetic coupling delivery device designed in this invention uses electromagnetic force to lock and release the delivery object, which solves the problem of asynchronous unlocking of the delivery object on the catapult without damaging the surface of the delivery object.

[0029] (2) The wind tunnel test air-magnetic coupling delivery device designed in this invention has an electromagnetic compensation structure for the interaction between permanent magnet and electromagnetic field. The change of current in the electromagnetic compensation structure generates a change of magnetic force, and the change of magnetic force is used to compensate for the delivery speed of the delivery object.

[0030] (3) The wind tunnel test gas-magnetic coupling delivery device designed in this invention can select the number of pistons. When a three-piston structure is adopted, the stability of the entire catapult motion mechanism can be fully guaranteed.

[0031] (4) The wind tunnel test air-magnetic coupling delivery device designed in this invention has a novel and reliable design for the electromagnetic locking structure and electromagnetic compensation structure, and has good adaptability to the delivery object.

[0032] (5) The wind tunnel test gas-magnetic coupling delivery device designed in this invention uses a cylinder as the main power source for delivery. The air inlet grooves between the quick connector and the piston holes at each end are equidistant, which ensures the synchronicity of the pressure generated by each piston. During the delivery process, fiber optic sensors are introduced to monitor the delivery speed parameters. At the same time, electromagnetic fields are used to compensate for the speed of the delivery object, thereby improving the accuracy of the initial delivery parameters during the delivery process. Attached Figure Description

[0033] Figure 1This is a general diagram of a wind tunnel test gas-magnetic coupling delivery device according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the air passage of the cylinder according to an embodiment of the present invention. Detailed Implementation

[0035] The invention will now be further described with reference to the accompanying drawings.

[0036] like Figure 1 As shown in the embodiment of the present invention, a wind tunnel test gas-magnetic coupling delivery device includes a quick connector 1, a cylinder 2, three piston rods 3, a piston pad 4, a cylinder fixing screw 5, a piston rod sealing ring 6, a base plate fixing screw 7, a pad screw 8, a base 9, a launch frame 10, a fiber optic sensor 11, a piston sealing ring 12, an aluminum alloy pad 13, a fixing pin 15, a base plate sealing ring 16, an electromagnetic locking structure, and two electromagnetic compensation structures. The electromagnetic locking structure includes an aluminum alloy pad 13, a first iron core 14, and a first coil 17. The electromagnetic compensation structures include a second iron core 18, a second coil 19, and a permanent magnet 21. To improve the fixing effect of the electromagnetic locking structure on the launch frame 10, a fixing block 20 is added in this embodiment, and the electromagnetic locking structure is placed inside the fixing block 20.

[0037] The cylinder 2 has N piston holes inside, which mate with the piston rod 3. The base plate is mounted on the base 9 using base plate fixing screws 7, and the cylinder 2 is mounted on the base plate using cylinder fixing screws 5. The cylinder 2 has an air inlet groove 28 inside, which connects to the top of the N piston holes. The quick connector 1 connects to the piston holes through the air inlet groove 28. The piston rod 3 has a piston sealing ring 12 for sealing. The lower end of the piston rod 3 has an opening for fixing the ejector frame 10. The piston pad 4 is fixed to the base plate using pad screws 8, and the lower end of the piston pad 4 has a piston rod sealing ring 6. The upper end of the ejector frame 10 is fixed to the piston rod 3, and the lower end of the ejector frame is connected to the second iron core 18 of the two electromagnetic compensation structures and the fixing block 20. The second iron core 18 has a second coil 19 inside. The permanent magnet 21 is located at the lower end of the axis of the second iron core 18 and is fixed inside the launcher 23. The first iron core 14 is located inside the fixing block 20. The upper end of the first iron core 14 is connected to the lower end face of the aluminum alloy pad 13 to avoid direct contact with the catapult frame 10. Two first coils 17 are provided on the left and right sides of the first iron core 14. The fiber optic sensor 11 is installed at the lower end of the base 9 for measuring the speed of the catapult frame.

[0038] In this embodiment, the base 9 is a cuboid structure with a concave structure in the middle for mounting the base plate; the upper edge of the base 9 has a protrusion for supporting and fixing the device in space; the concave structure has a slot that penetrates the bottom surface of the base 9, and the shape of the slot is adapted to the shape of the catapult 10; the bottom of the base 9 has a fiber optic sensor mounting slot and a fiber optic sensor wiring hole.

[0039] The base plate is a long plate structure with openings at both ends for mounting base plate fixing screws 7; three holes in the middle mate with the piston rod 3. Steps are provided at the openings for mounting the piston rod sealing ring 6. The piston rod sealing ring 6 is fixed using a piston pad 4. The size of the openings in the base plate is determined according to the size of the piston rod. The base plate sealing ring 16 is located at the contact surface between the base plate and the cylinder 2.

[0040] In this embodiment, the cylinder has a cuboid structure with protrusions at both ends of the bottom for fixing to the base plate. Figure 2 As shown, the cylinder 2 has three piston holes, two air inlet slots 28, and an air outlet slot 26 inside. An air outlet connector 24 is provided on the side wall of the cylinder 2. The three piston holes are arranged side-by-side at equal intervals for mounting three piston rods 3. The two air inlet slots 28 are symmetrically arranged at the top of the three piston holes, each air inlet slot 28 connecting two adjacent piston holes. A quick connector 1 is located in the center of the two air inlet slots 28 and connects to one end of each air inlet slot 28, ensuring that the distance between the quick connector 1 and the air inlet slots 28 between each piston hole is equal, improving the synchronization and stability of air pressure control. A first block 27 is provided at the other end of the two air outlet slots. The air outlet slot 26 connects to the bottom of the three piston holes and is in an inverted U-shape, connecting from both sides of the bottom of the middle piston hole to the upper part of the cylinder 2. Second block 25s are provided at both ends of the air outlet slot 26 at the upper part of the cylinder 2. An opening is made in the side wall of the cylinder to communicate with the outside, and an air outlet connector 24 is installed at the opening and communicates with the air outlet slot 26.

[0041] In this embodiment, the ejection frame 10 is a long strip-shaped structure. Two protruding structures are provided at the upper end of the ejection frame 10, penetrating the upper surface of the ejection frame. Three holes are opened on the protruding structures for connecting the piston rod 3. A square hole is provided at the lower end of the piston rod 3. A fixing pin 15 is used in the square hole to fix it to the protruding structures of the ejection frame 10, with the fixing pin making line contact with the square hole.

[0042] The lower surface of the catapult frame 10 is provided with screw holes for connecting the fixing block 20 and the two second iron cores 18. The catapult frame 10 has openings inside for the wiring of the first coil 17 and the second coil 19.

[0043] The first core 14 of the electromagnetic locking structure is an inverted U-shaped structure with cylindrical sides and a square middle section. Two first coils 17 of the electromagnetic locking structure are positioned on the cylindrical sides of the first core 14, rotating in opposite directions. At the cross-section where the electromagnetic locking structure engages with the launcher 23, the magnetic field lines form a loop. The first core 14 is made of soft magnetic material, and an aluminum alloy gasket 13 is provided at the contact point between the first core 14 and the ejector frame 10. When the electromagnetic locking structure is energized, it generates electromagnetic force to attract the launcher 23, locking it below the ejector frame 10. Simultaneously, as the air inlet 28 is ventilated, the electromagnetic locking structure is de-energized, the attraction to the launcher 23 disappears, and the launcher 23 is unlocked and released.

[0044] The second core 18 of the electromagnetic compensation structure is a cylindrical structure with a base connected to the lower end face of the catapult 10. The interior of the second core 18 is a hollow cylinder with a central cylindrical section for placing the second coil 19 inside. An opening is provided at the bottom of the second core 18 for routing the second coil 19. The second coil 19 of the electromagnetic compensation structure is located within the hollow cylindrical structure of the second core 18 and is wound in one direction around the cylindrical section. In the longitudinal section of the electromagnetic compensation structure, the magnetic field lines are inverted E-shape. The second core 18 is made of soft magnetic material.

[0045] An opening is provided at the projection position of the object 23 below the inner cylindrical section of the second iron core 18. A permanent magnet 21 is installed in the opening. The diameter of the permanent magnet 21 is the same as the diameter of the inner cylindrical section of the second iron core 18, and there is a certain gap between the permanent magnet 21 and the second iron core 18.

[0046] When the second coil 19 of the electromagnetic compensation structure is energized, it generates an electromagnetic field that interacts with the permanent magnet 21 to form a pneumatic-magnetic coupled ejection feedback loop. Depending on the direction of the energizing current, when the magnetic field lines generated by the electromagnetic compensation structure and the magnetic field lines of the permanent magnet 21 are opposite in direction in the interaction region, a repulsive force is generated, increasing the velocity of the projectile 23. When the magnetic field lines generated by the electromagnetic compensation structure and the magnetic field lines of the permanent magnet 21 are in the same direction in the interaction region, an attractive force is generated, decreasing the velocity of the projectile 23. Furthermore, by changing the magnitude of the energizing current, the magnitude of the electromagnetic force is changed, thus correcting the velocity of the projectile 23.

[0047] The section where the object 23 is coupled with the electromagnetic locking structure is called the middle section 22 of the object. The middle section of the object is made of soft magnetic material and can be either perforated or solid.

[0048] When using the device of this invention, at the start of the test, the piston rod 3 retracts first, the first coil 17 is energized, and the object 23 is placed below the first iron core 14, which locks the object 23 in place. The ejection pressure of the cylinder 2 is adjusted, and the controller controls the cylinder 2 to move, causing the piston rod 3 to move downwards, ejecting the object 23. Simultaneously, the first coil 17 is de-energized. The fiber optic sensor 11 measures the downward speed of the ejector frame 10, and after calculation, determines the control current of the second coil 19. The power controller drives the second coil 19 with the calculated current, making the second iron core 18 magnetic. The magnetic field interaction between the permanent magnet 21 and the second iron core 18 generates attraction or repulsion, compensating for the speed of the object. By changing the current in the second coil 19, the magnitude of the attraction or repulsion is changed, thereby controlling the speed compensation of the object 23.

[0049] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A wind tunnel test gas-magnetic coupling delivery device, characterized in that... Includes quick connector (1), cylinder (2), ejector frame (10), electromagnetic locking structure, and electromagnetic compensation structure; The cylinder (2) has N piston holes inside, which are matched with the piston rod (3). The lower end of the piston rod is fixed to the upper end face of the ejector frame (10). The cylinder (2) has an air inlet groove (28) inside, which connects to the top of the N piston holes. The quick connector (1) is connected to the piston hole through the air inlet groove (28). When the air inlet groove (28) is ventilated, the piston rod (3) moves downward, which drives the ejector frame (10) to move downward. The electromagnetic locking structure is connected to the middle of the lower end face of the catapult (10). When the electromagnetic locking structure is energized, it generates electromagnetic force to attract the object (23) and lock the object (23) under the catapult (10). After the air inlet (28) is ventilated, the electromagnetic locking structure is de-energized, the attraction of the object (23) disappears, and the object (23) is unlocked and released. The electromagnetic compensation structure is connected to both ends of the lower end face of the catapult (10). When energized, it generates an electromagnetic field. By changing the direction of the current, the direction of the electromagnetic force is changed to form an attractive or repulsive force. By changing the magnitude of the current, the magnitude of the electromagnetic force is changed, thus correcting the speed of the catapult (10); N≥1. The electromagnetic locking structure includes an aluminum alloy pad (13), a first iron core (14), and two first coils (17). An aluminum alloy pad (13) is fixedly connected to the middle position of the lower end face of the catapult frame (10); The first iron core (14) has a U-shaped structure. The first iron core (14) is installed on the lower end face of the aluminum alloy pad (13), and the U-shaped opening faces downward. Two first coils (17) are symmetrically distributed about the axis of symmetry of the first iron core (14), and are wound on the longitudinal part of the U-shaped structure of the first iron core (14) respectively, with opposite directions of rotation; The electromagnetic compensation structure comprises M units, where M is an even number greater than 0; each electromagnetic compensation structure comprises a second iron core (18), a second coil (19), and a permanent magnet (21). The second iron core (18) is a cylindrical structure with a base. Its base is connected to the lower end face of the catapult (10). The second iron core (18) has a cylindrical cavity inside, and a cylindrical section is provided in the center of the cavity. The second coil (19) is wound on the cylindrical section at the center of the cavity; The permanent magnet (21) is fixed inside the object (23) and corresponds to the position of the inner cylindrical section of the second iron core (18); When the second coil (19) of the electromagnetic compensation structure is energized, it generates an electromagnetic field that interacts with the permanent magnet (21) to form a gas-magnetic coupled ejection feedback loop. Depending on the direction of the energized current, when the magnetic field lines generated by the electromagnetic compensation structure are opposite to the magnetic field lines of the permanent magnet (21) in the interaction area, a repulsive force is generated to increase the speed of the object (23); when the magnetic field lines generated by the electromagnetic compensation structure are in the same direction as the magnetic field lines of the permanent magnet (21) in the interaction area, an attractive force is generated to decrease the speed of the object (23).

2. The wind tunnel test gas-magnetic coupling delivery device according to claim 1, characterized in that, The first iron core (14) is made of soft magnetic material.

3. The wind tunnel test gas-magnetic coupling delivery device according to claim 1, characterized in that, The section where the object (23) engages with the electromagnetic locking structure is made of soft magnetic material.

4. The wind tunnel test gas-magnetic coupling delivery device according to claim 1, characterized in that, The second iron core (18) is made of soft magnetic material.

5. The wind tunnel test gas-magnetic coupling delivery device according to claim 1, characterized in that, The diameter of the permanent magnet (21) is the same as the diameter of the cylindrical section of the second iron core (18).

6. The wind tunnel test gas-magnetic coupling delivery device according to claim 1, characterized in that, It also includes a fiber optic sensor (11) for measuring the speed of the catapult (10) as it moves downward.

7. The wind tunnel test gas-magnetic coupling delivery device according to claim 1, characterized in that, The quick connector (1) is equidistant from the air inlet groove (28) between each end piston hole.

8. The wind tunnel test gas-magnetic coupling delivery device according to claim 1, characterized in that, The cylinder (2) is also provided with an air outlet groove (26) and an air outlet connector (24); The exhaust groove (26) connects to the bottom of N piston holes and connects from the bottom of the piston holes to the upper part of the cylinder (2) to form an exhaust circuit; the cylinder (2) has an opening on its side wall and is provided with an exhaust connector (24), which is connected to the exhaust groove (26); the exhaust groove (26) is ventilated and the ejector frame (10) is retracted.

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