An eccentric propulsion projectile for water entry test of non-rotating structures

Abstract

The present invention discloses an eccentric pusher for a water entry test of a non-rotating structure, which belongs to the field of hydrodynamic experiments; it includes a sealing connection module, a reinforcement module, an eccentric module and a stabilization module; the tail of the eccentric module is connected to the sealing connection module through the reinforcement module, and the head thereof is equipped with a stabilization module; the pusher is fixedly connected to the tail of a launch tube through the sealing connection module, and the airtightness during the launch is ensured; the bending resistance of the eccentric pusher is increased through the reinforcement module; the center of gravity height of the eccentric pusher as a whole is lowered through the eccentric module, and the rolling stability during the launch process is increased; the pushing torque is eliminated through the stabilization module, and the stability of the structure during acceleration is increased. The present invention eliminates the possible rolling influence through the eccentric design of the eccentric pusher; it has a simple structure, is easy to install, and has a low cost, and can provide a stable pushing acceleration function for the high-speed water entry test of non-rotating structures.

Description

Technical Field

[0001] The invention belongs to the field of hydrodynamic experiments, and in particular relates to an eccentrically propelled projectile for a water entry test of a non-rotating structure. Background Art

[0002] The engineering applications of high-speed water entry research are extremely extensive and closely related to our lives. From the forced landing of aircraft on water to the high-speed entry of underwater weapons, all of them reflect the practical application value of this research. The high-speed entry of structures into water is a complex gas-liquid-solid three-phase coupling mechanical process. In addition to theoretical analysis and numerical simulation, experimental research is also an important research method, which can more intuitively obtain the change law of the corresponding physical parameters.

[0003] The prior art discloses a high-speed water entry launching device, which includes a high-pressure gas chamber, a solenoid valve, a flange, a launch tube, a linear bearing part, an electric push rod connecting ring, an electric push rod, an angle adjustment support, an air gun base, a high-pressure gas chamber mounting plate, a detachable support frame and an air gun base support, so as to achieve the effect of high-speed launching of a slender body into water, realize accurate control of the angle of entry of the projectile into water, and conveniently and quickly install the experimental projectile, thereby improving the experimental efficiency. The device is a typical air cannon water entry launching device, and the experimental object is mostly a slender body in the shape of a rotating body, and the launch tube is a circular tube. At the same time, in the experiment of the structure entering water, the launch device uses high-pressure gas to accelerate the structure, and there is a requirement for air tightness during the launching process, so there are certain restrictions on the shape and size of the structure, requiring that the size of the structure cannot exceed the inner diameter of the launch tube, and the shape is preferably a rotating body, which brings difficulties to the smooth implementation of the water entry experiment of the structure in the shape of a non-rotating body. The method of push-launch can solve this problem well. The launch device accelerates the pusher bullet by high pressure gas, and then the pusher bullet pushes the structure to accelerate it on the slide rail, and the two separate after the acceleration. This method can get rid of the limitation of the launch tube for the shape of the structure. It should be noted that the center of gravity position of the non-rotating structure generally does not coincide with the axis of the launch tube, which causes the method of push-launch to give the non-rotating shape structure a moment of force, which is disadvantageous to the non-rotating shape structure whose axial scale is obviously smaller than the radial direction (for example, with wing shape) or the mass is smaller, especially when its center of gravity position is higher than the axis of the launch tube, the moment of force can make the non-rotating shape structure tilt up to produce the adverse effects such as the angle of attack into the water and even the occurrence of the overturning accident. For the rotating structure, although the center of gravity cannot guarantee to coincide with the axis of the launch tube, the acceleration process is carried out in the launch tube, and the launch tube wall will provide radial constraints, so there is no need to consider this problem. To address this problem, it is necessary to design an eccentric pusher spring structure that is adapted to existing experimental conditions and needs. Through the eccentric setting of the front top block, the line of action of the force of the eccentric pusher spring passes through the center of gravity of the rotating body. Through the eccentric setting of the long rod, the rolling effect of the eccentric pusher spring is eliminated to achieve the purpose of stable pushing.

[0004] Before push-launching, the eccentric pusher needs to be fixed to prevent the eccentric pusher from sliding down under the action of gravity after the launch tube is raised. At the same time, the stable contact between the eccentric pusher and the structure before launch and the rapid separation of the two after the acceleration are completed need to be considered. During the push-acceleration process, the air tightness and acceleration stroke need to be considered, and the stability of the push-acceleration process also needs to be considered. Therefore, the present invention proposes an eccentric pusher structure under the push-launch mode adapted to the existing launch device. Summary of the invention

[0005] Technical issues to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present invention provides an eccentric pusher for a water entry test of a non-rotating structure, including a sealing connection module, a reinforcement module, an eccentric module and a stabilization module. The long rod arrangement of the eccentric module lowers the overall center of gravity height of the eccentric pusher and increases the rolling stability during the launch process; the strengthening module increases the bending resistance of the eccentric pusher; the stabilization module eliminates the pushing torque and increases the stability of the structure during acceleration. The long rod is used to achieve the purpose of weight reduction and ensure the pushing stroke of the eccentric pusher on the non-rotating structure. The rotating body shape of the base ensures the airtightness of the launch.

[0007] The technical solution of the present invention is: an eccentric propulsion projectile for a non-rotating structure water entry test, comprising a sealing connection module, a reinforcement module, an eccentric module and a stabilization module; the tail of the eccentric module is connected to the sealing connection module through the reinforcement module, and the head of the eccentric module is installed with the stabilization module;

[0008] The propulsion projectile is fixedly connected to the tail of the launch tube through the sealing connection module, and the airtightness during the launch is ensured;

[0009] The bending resistance of the eccentrically propelled projectile is increased by the reinforcement module;

[0010] The eccentric module is used to lower the center of gravity height of the eccentric propellant projectile as a whole, thereby increasing the rolling stability during the launch process;

[0011] The stabilization module eliminates the thrust moment and increases the stability of the structure during acceleration.

[0012] A further technical solution of the present invention is: the sealing connection module includes a base and a break bolt, the outer peripheral surface of the base is consistent with the inner peripheral surface of the launch tube, and is a clearance fit, which can slide relative to each other and ensure air tightness during launch; the outer end surface of the base is fixedly connected to the tail of the launch tube by the break bolt to ensure positioning before launch and timely separation after launch.

[0013] A further technical solution of the present invention is: the base is a disc structure, the inner end surface of which is a weight-reducing structure and is provided with a mounting boss.

[0014] A further technical solution of the present invention is: the reinforcement module comprises a rear seat and a reinforcement block;

[0015] The rear seat is a columnar structure, the bottom surface of which is an arc surface consistent with the lower wall surface of the launch tube, and fits with the lower wall surface during installation; the rear end of the rear seat is fixedly connected to the mounting boss below the front end surface of the base, and the front end is fixedly connected to the eccentric module;

[0016] One end of the reinforcing block is fixedly connected to the upper mounting boss on the front end surface of the base, and the other end is fixedly connected to the front edge of the upper end surface of the rear seat, so as to enhance the connection strength.

[0017] A further technical solution of the present invention is that a groove structure is arranged at the rear of the upper end surface of the rear seat to facilitate the installation of fixing bolts and reduce weight.

[0018] A further technical solution of the present invention is: the stabilization module comprises a front seat, a front top block and a magnet;

[0019] The front seat is a columnar structure, the bottom surface of which is an arc surface consistent with the lower wall surface of the launch tube, and fits with the lower wall surface during installation; the rear end of the front seat is connected to the eccentric module, and the front end is connected to the front top block;

[0020] The front top block includes a flat plate and a cantilever, wherein the flat plate is fixed to the front end surface of the front seat, and the cantilever is vertically fixed above the front side surface of the flat plate, and the height is adapted to the center of gravity of the structure;

[0021] The magnet is fixed to the front end of the cantilever and is used for initial positioning of the structure before launching and stable adsorption during launching.

[0022] A further technical solution of the present invention is: a connecting plate is vertically fixed to the flat rear end surface of the front top block, and the connecting plate is fixedly connected to the upper end surface of the front seat to enhance the connection strength.

[0023] A further technical solution of the present invention is: the magnet is provided with a central hole, and a bolt passes through the central hole and is fixed to the front end of the cantilever.

[0024] A further technical solution of the present invention is: the eccentric module is a long rod, the front end of which is coaxially fixedly connected to the front seat by bolts, and the rear end is coaxially fixedly connected to the rear seat by threads; the center line of the long rod is located below the center line of the launch tube.

[0025] A further technical solution of the present invention is that the length of the long rod corresponds to the length of the launch tube, thereby ensuring that the propulsion projectile can accelerate the structure throughout the entire process in the launch tube.

[0026] A further technical solution of the present invention is that the fixed connection between the various parts in the propulsion bomb is achieved by bolts.

[0027] Beneficial Effects

[0028] The beneficial effect of the present invention is that when the non-rotating structure water entry test is carried out using the eccentric push bullet of the present invention, the eccentric push bullet is fixed to the tail of the launch tube by breaking the bolts and the iron wire before launching, and the tail end face of the non-rotating structure is adsorbed on the front end face magnet of the eccentric push bullet, so that the eccentric push bullet and the non-rotating structure as a whole will not slide down under the action of gravity during the process of the launch tube raising the launch angle. During the acceleration process, the shape of the base ensures air tightness, the length of the long rod corresponds to the length of the launch tube, and the eccentric push bullet can accelerate the structure throughout the process. The eccentric arrangement of the eccentric push bullet enhances its own rolling stability. By processing different front top blocks and adjusting the height of the cantilever to ensure that the push bullet can face the center of gravity of different non-rotating structures, the force transmission between the eccentric push bullet and the structure is stable, and the adsorption effect of the magnet is added to achieve a stable acceleration process of the structure.

[0029] The eccentric design of the eccentric push bullet can eliminate the possible rolling effect; the reinforcing block can eliminate the bending moment caused by the eccentric design, thereby increasing the bending resistance of the eccentric push bullet; the front top block is aligned with the center of gravity of the structure to eliminate the torque that may be generated during the pushing acceleration process, thereby increasing the stability of the pushing process; the long rod is used to connect the front seat and the rear seat, which can not only reduce the overall weight of the eccentric push bullet, but also enable the non-rotating structure that cannot be placed in the launch tube to receive the thrust of the front top block during the entire process of the eccentric push bullet acceleration, thereby ensuring the pushing stroke of the structure by the eccentric push bullet. The base not only provides a base for the fixed connection of other parts, but also ensures the airtightness of the launch due to the shape of the rotating body. The present invention has a simple structure, convenient installation, and low cost, and can provide a stable pushing acceleration function for high-speed water entry experiments of non-rotating structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure;

[0031] Figure 2 is a schematic diagram of the base structure;

[0032] Figure 3 It is a schematic diagram of the rear seat structure;

[0033] Figure 4 It is a schematic diagram of the front seat structure;

[0034] Figure 5 is a schematic diagram of the reinforcement block structure;

[0035] Figure 6 It is a schematic diagram of the long rod structure;

[0036] Figure 7 1 is a schematic diagram of the front top block structure;

[0037] Figure 8 is a schematic diagram of the magnet structure;

[0038] Fig. 9 It is a schematic diagram of the bolt breaking structure;

[0039] Explanation of the accompanying drawings: 1—base, 2—rear seat, 3—front seat, 4—reinforcement block, 5—long rod, 6—front top block, 7—magnet, 8—pull-off bolt, 9—front seat hole, 10—cantilever, 11—rear seat fixing bolt, 12—reinforcement block fixing bolt, 13—stabilizing bolt, 14—end thread, 15—long rod fixing bolt, 16—top block fixing bolt, 17—magnet fixing screw, 18—rear seat threaded hole. DETAILED DESCRIPTION

[0040] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] like Figure 1 As shown, the present embodiment is an eccentric thrust projectile for a water entry test of a non-rotating structure, which includes a base 1, a rear seat 2, a front seat 3, a reinforcement block 4, a long rod 5, a front top block 6, a magnet 7 and a breaking bolt 8.

[0043] like Figure 2 , 9 As shown, the base 1 is a rotating body, the front end face is lightened, and only the boss for mounting other parts is retained; the rear end face is a plane, and the center has a threaded hole for mounting the break bolt 8. The eccentric push projectile is softly fixed before launching by passing a thin iron wire through the through hole at the tail of the break bolt and hanging the two ends of the iron wire in the slot at the tail of the launch tube.

[0044] like Figure 3 , 4As shown in FIGS. 5 and 6, the lower end surfaces of the rear seat 2 and the front seat 3 are arc surfaces that can fit with the inner wall of the launch tube. The front end of the rear seat 2 is a threaded hole connected to the long rod 5, and the rear end of the front seat 3 is a front seat hole 9 connected to the long rod 5. One end of the reinforcement block 4 is fixedly connected to the upper mounting boss of the front end surface of the base 1, and the other end is fixedly connected to the front edge of the upper end of the rear seat 2 to enhance the connection strength. The center line of the long rod 5 is located below the center line of the launch tube.

[0045] like Figure 7 As shown, the cantilever 10 of the front top block 6 is highly adapted to the center of gravity of the structure, and a threaded hole for installing the magnet 7 is provided at the front end of the cantilever 10. By processing different front top blocks, the height of the cantilever is adjusted to ensure that the pusher can face the center of gravity of different non-rotating structures, so as to achieve stable force transmission between the eccentric pusher and the structure, and with the adsorption effect of the magnet, a stable acceleration process of the structure is achieved.

[0046] The breaking bolt 8 is fixedly connected to the threaded hole on the base 1 through the end thread; the rear seat 2 is fixedly connected to the base 1 through two rear seat fixing bolts 11; the reinforcement block 4 is fixedly connected to the base 1 through two reinforcement block fixing bolts 12, and the reinforcement block 4 is fixedly connected to the rear seat 2 through two fixing bolts 13; one end of the long rod 5 is fixedly connected to the rear seat 2 through the end thread 14, and the other end is inserted into the front seat hole 9, and the three are fixed by three long rod fixing bolts 15 passing through the front top block 6, the front seat 3 and the long rod 5; the front top block 6 is fixed to the front end surface of the front seat 3 by two top block fixing bolts 16; the magnet 7 is fixedly connected to the front end of the cantilever 10 of the front top block 6 by a magnet fixing screw 17.

[0047] The installation and use process of the present invention will be described below in conjunction with the accompanying drawings.

[0048] During installation, firstly, the rear seat 2 is fixed to the base 1 with two rear seat fixing bolts 11; then the reinforcing block 4 is placed between the base 1 and the rear seat 2, and the reinforcing block 4 is fixedly connected to the base 1 with two reinforcing block fixing bolts 12, and the reinforcing block 4 is fixedly connected to the rear seat 2 with two stabilizing bolts 13; then the front top block 6 is fixed to the front seat 3 with two top block fixing bolts 16, one end of the long rod 5 with three threaded holes is inserted into the front seat hole 9, and the long rod 5 is rotated so that the three threaded holes are aligned with the three holes on the upper surface of the front seat 3, and the front top block 6, the front seat 3 and the long rod 5 are fixed with three long rod fixing bolts 15; then the end thread 14 of the other end of the long rod 5 is screwed into the threaded hole 18 of the rear seat, and after being screwed into a certain depth, it is necessary to ensure that the front end surface of the cantilever 10 of the front top block 6 can be aligned with the center of gravity of the structure; finally, the magnet 7 is fixedly connected to the front end of the cantilever 10 of the front top block 6 with a magnet fixing screw 17, and the threaded end of the pull-off bolt is screwed into the base 1.

[0049] During the experiment, the installed eccentric push bullet is put into the launch tube, the structure is placed on the slide rail, it is ensured that the front end face of the cantilever 10 of the front top block 6 contacts the structure, so that the magnet 7 can absorb the structure, and then pass the through hole of the rear part of the bolt 8 with a thin iron wire, and hang the two ends of the iron wire in the draw-in slot at the rear part of the launch tube, and the eccentric push bullet is temporarily fixed to the launch tube tail, so that the eccentric push bullet and the structure as a whole will not slide down under gravity when the launch tube and the slide rail promote the launch angle. During the launch, the high-pressure gas acts on the base 1 of the eccentric push bullet, and the eccentric push bullet is forced to move forward, and the thin iron wire is forced to bend and break away from the draw-in slot. The eccentric push bullet pushes the non-rotating body structure forward on the slide rail, and the structure is continuously accelerated before the eccentric push bullet is completely out of the tube. After the eccentric push pops out of the tube, the structure also breaks away from the slide rail, and at this moment, the eccentric push bullet is still on the slide rail, and the structure is separated from the eccentric push bullet by gravity. The whole process can realize the stable acceleration process of the non-rotating structure. Due to its simple structure, low cost and reusability, the present invention provides convenience for carrying out the water entry experiment of the non-rotating structure under the existing experimental conditions.

[0050] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. An eccentrically propelled projectile for a non-rotating structure water entry test, characterized in that: It includes a sealing connection module, a reinforcement module, an eccentric module and a stabilization module; the tail of the eccentric module is connected to the sealing connection module through the reinforcement module, and the head of the eccentric module is installed with the stabilization module; The propulsion projectile is fixedly connected to the tail of the launch tube through the sealing connection module, and the airtightness during the launch is ensured; The bending resistance of the eccentrically propelled projectile is increased by the reinforcement module; The eccentric module is used to lower the center of gravity height of the eccentric propellant projectile as a whole, thereby increasing the rolling stability during the launch process; The stabilization module is used to eliminate the thrust moment and increase the stability of the structure during acceleration; The sealing connection module includes a base and a break bolt. The outer peripheral profile of the base is consistent with the inner peripheral profile of the launch tube and is a clearance fit, which can slide relative to each other and ensure air tightness during launch. The outer end surface of the base is fixedly connected to the tail of the launch tube by the break bolt to ensure positioning before launch and timely separation after launch. The reinforcement module includes a rear seat and a reinforcement block; the rear seat is a columnar structure, the bottom surface of which is an arc surface consistent with the lower wall surface of the launch tube, and fits with the lower wall surface during installation; the rear end of the rear seat is fixedly connected to the lower mounting boss of the front end surface of the base, and the front end is fixedly connected to the eccentric module; one end of the reinforcement block is fixedly connected to the upper mounting boss of the front end surface of the base, and the other end is fixedly connected to the front edge of the upper end of the rear seat, so as to enhance the connection strength; The stabilization module includes a front seat, a front top block and a magnet; the front seat is a columnar structure, the bottom surface of which is an arc surface consistent with the lower wall surface of the launch tube, and fits with the lower wall surface during installation; the rear end of the front seat is connected to the eccentric module, and the front end is connected to the front top block; the front top block includes a flat plate and a cantilever, the flat plate is fixed to the front end surface of the front seat, and the cantilever is vertically fixed above the front side surface of the flat plate, and the height is adapted to the center of gravity of the structure; the magnet is fixed to the front end of the cantilever, and is used for the initial positioning of the structure before launching and the stable adsorption during launching; The eccentric module is a long rod, the front end of which is coaxially fixedly connected to the front seat by bolts, and the rear end is coaxially fixedly connected to the rear seat by threads; the center line of the long rod is located below the center line of the launch tube.

2. The eccentric propulsion projectile for the water entry test of a non-rotating structure according to claim 1, characterized in that: The base is a disc structure, the inner end surface of which is a weight-reducing structure and is provided with a mounting boss.

3. The eccentrically propelled projectile for the water entry test of a non-rotating structure according to claim 2, characterized in that: A groove structure is arranged at the rear of the upper end surface of the rear seat to facilitate installation of fixing bolts and weight reduction.

4. The eccentrically propelled projectile for the water entry test of a non-rotating structure according to claim 1, characterized in that: A connecting plate is vertically fixed to the flat rear end surface of the front top block, and the connecting plate is fixedly connected to the upper end surface of the front seat to enhance the connection strength.

5. The eccentric propulsion projectile for the water entry test of a non-rotating structure according to claim 1, characterized in that: The length of the long rod corresponds to the length of the launch tube, ensuring that the thrust projectile can accelerate the structure throughout the entire process in the launch tube.

6. The eccentrically propelled projectile for the water entry test of a non-rotating structure according to any one of claims 1 to 5, characterized in that: The fixed connection between the various parts in the push bomb is achieved by bolts.

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