Ship bow structure oblique water entry slamming experiment device

Abstract

The invention relates to a ship bow structure oblique water entry slamming experiment device, which comprises a water tank, a portal frame, an ejection assembly and a connecting assembly, and is characterized in that the portal frame is arranged across the water tank; the ejection assembly comprises a lifting table, an ejection vehicle and a lifting part, the lifting part is installed on the portal frame, the output end of the lifting part is connected with the lifting table and used for driving the lifting table to move in the vertical direction, and the ejection vehicle is slidably connected with the lifting table in the direction close to or away from the water pool; the ship bow can be connected with or separated from the catapult vehicle through the connecting assembly. The height of the lifting platform can be adjusted to control the water entry height of the ship bow, the advancing speed of the catapult vehicle can be adjusted to control the horizontal initial speed of the ship bow when the ship bow enters water, rapid connection and separation between the catapult vehicle and the ship bow can be achieved through the arranged connecting assembly, and the experiment device can effectively control the water entry height and the horizontal initial speed of the ship bow when the ship bow enters water. The influence of different water entry parameters on slamming is explored, the actual slamming environment of the ship bow can be accurately simulated, and experimental data are more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of hull water entry tests, and in particular to a bow structure oblique water entry slamming test device. Background Art

[0002] When a ship is sailing in severe sea conditions, large ship-wave relative motion is likely to occur. Waves hitting the bow cause significant slamming, rising water, flow separation, high-speed jets and other strong nonlinear phenomena, which are difficult to capture and predict using numerical methods. Actual or simplified bow models are often used to analyze the slamming mechanism through slamming experiments.

[0003] At present, the water tank slamming test device is mainly a vertical drop body slamming test, which does not take into account the influence of the ship's speed on the slamming. The experimental phenomena and laws obtained are different from the actual situation, and the measured bow slamming pressure is not accurate enough. Summary of the invention

[0004] In view of this, it is necessary to provide a bow structure oblique water entry slamming test device.

[0005] The present invention provides a bow structure oblique water entry slamming test device, comprising a water pool, a gantry, a catapult assembly and a connecting assembly, wherein the gantry is arranged across the water pool; the catapult assembly comprises a lifting platform, a catapult vehicle and a lifting member, wherein the lifting member is installed on the gantry, an output end of the lifting member is connected to the lifting platform for driving the lifting platform to move in a vertical direction, and the catapult vehicle is slidably connected to the lifting platform in a direction approaching or moving away from the water pool; the bow of the ship can be connected to or separated from the catapult vehicle through the connecting assembly.

[0006] Furthermore, the ejection vehicle includes a vehicle body and a traveling member, the vehicle body is slidably connected to a slide groove provided on the lifting platform, the traveling member is installed on the vehicle body, and a traveling end of the traveling member is connected to the lifting platform for driving the vehicle body to move.

[0007] Furthermore, the traveling member includes a rotating shaft, a traveling gear, a rack, a motor, a first bevel gear and a second bevel gear. The rotating shaft is horizontally arranged and rotatably connected to the vehicle body. The traveling gear is installed at the end of the rotating shaft. The rack is arranged parallel to the slide groove and fixedly arranged on the lifting platform. The traveling gear is meshingly connected with the rack. The motor is installed on the top of the vehicle body. The output end of the motor is connected to the first bevel gear. The second bevel gear is installed on the rotating shaft. The first bevel gear and the second bevel gear are meshingly connected.

[0008] Furthermore, the connection assembly includes a first connection part, a second connection part and a control part, the first connection part is connected to the catapult vehicle, the second connection part is used to connect to the bow, and the control part can control the connection or separation of the first connection part and the second connection part.

[0009] Furthermore, the first connecting part includes a connecting rod and an electromagnet, the second connecting part includes an iron block and a spherical block, the top end of the connecting rod is fixedly connected to the bottom of the catapult vehicle, the bottom end of the connecting rod is fixedly connected to the electromagnet, a spherical groove is provided at the bottom of the iron block, the spherical block is embedded in the spherical groove, and the bottom of the iron block is fixedly connected to the bow.

[0010] Furthermore, the connecting assembly also includes a posture adjusting member, which is installed at the bottom of the ejection vehicle, and the output end of the posture adjusting member can abut against the bow of the ship to adjust the heel angle and / or pitch angle of the bow of the ship.

[0011] Furthermore, the attitude adjustment component includes four lifting cylinders and four lifting balls. The four lifting cylinders are arranged along the circumference of the connecting rod and are fixedly connected to the bottom of the ejection vehicle. The bottom ends of the four lifting cylinders are output ends and can move in the vertical direction. The output ends of the four lifting cylinders are respectively connected to four lifting balls, and the four lifting balls can abut against the bow of the ship.

[0012] Furthermore, the control unit includes a contact switch and a limit block, the limit block is installed on the lifting platform and located on the moving path of the ejection vehicle, the contact switch is installed on a side of the ejection vehicle close to the limit block, the contact switch is electrically connected to the electromagnet, and the contact switch is configured to be triggered when it contacts the limit block, and the electromagnet switches from a power-on state to a power-off state.

[0013] Furthermore, the limit block is slidably connected to the lifting platform, the moving path of the limit block overlaps with the moving path of the ejection vehicle, and the connecting assembly also includes a limit screw, the free end of which passes through a threaded hole provided on the limit block and can abut against the lifting platform.

[0014] Furthermore, the contact switch is electrically connected to the ejection vehicle, and the contact switch is configured to be triggered when it contacts the limit block, and the ejection vehicle is powered off and stops moving.

[0015] Compared with the prior art, the height of the bow entering the water can be controlled by adjusting the height of the lifting platform, the horizontal initial velocity of the bow when entering the water can be controlled by adjusting the travel speed of the catapult vehicle, and the quick connection and separation between the catapult vehicle and the bow can be achieved through the set connection components. In summary, the experimental device can effectively control the height of the bow when entering the water and the influence of the horizontal initial velocity on the slamming, can accurately simulate the actual slamming environment of the bow, and the experimental data is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the overall structure of a bow structure oblique water entry slamming test device provided by an embodiment of the present invention; Figure 2 A schematic top view of a ejection assembly in a bow structure oblique water entry slamming test device provided in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view of the middle AA plane; Figure 4 A schematic structural diagram of a first connecting portion and a second connecting portion in a bow structure oblique water entry slamming test device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0018] like Figure 1 As shown, a bow structure oblique water entry slamming test device provided by the present invention includes a pool 100, a gantry 200, an ejection assembly 300 and a connecting assembly 400, wherein the gantry 200 is arranged across the pool 100; the ejection assembly 300 includes a lifting platform 310, an ejection vehicle 320 and a lifting member 330, wherein the lifting member 330 is installed on the gantry 200, and an output end of the lifting member 330 is connected to the lifting platform 310 for driving the lifting platform 310 to move in a vertical direction, and the ejection vehicle 320 is slidably connected to the lifting platform 310 in a direction close to or away from the pool 100; the bow M can be connected to or separated from the ejection vehicle 320 through the connecting assembly 400.

[0019] During implementation, the height of the lifting platform 310 can be adjusted to control the height of the bow M entering the water, and the horizontal initial velocity of the bow M when entering the water can be controlled by adjusting the travel speed of the catapult vehicle 320. By energizing the magnetic suction component 410, the bow M is installed to the bottom of the catapult vehicle 320. At the same time, the catapult vehicle 320 and the bow M can be quickly connected and separated through the provided connecting assembly 400. In summary, the experimental device can effectively control the height of the bow M when entering the water and the influence of the horizontal initial velocity on the slamming, and can accurately simulate the actual slamming environment of the bow M, and the experimental data is more accurate.

[0020] The water pool 100 in this embodiment contains water, which may be seawater or water of other components, and is not limited thereto. It should be noted that the size of the water pool 100 should be determined according to the size of the bow M and actual needs, so as to provide an environment for the oblique water entry slamming test of the bow structure.

[0021] The gantry 200 in this embodiment is a structure straddling the pool 100 . It is understandable that the gantry 200 is a frame structure that can be thought of by those skilled in the art, and no further elaboration and explanation will be given here.

[0022] The ejection assembly 300 in this embodiment is used to drive the structure of the bow M connected thereto to move, and is used to control the water entry height and the horizontal initial velocity of the bow M when entering the water. Specifically, the ejection assembly 300 includes a lifting platform 310, a ejection vehicle 320 and a lifting member 330, the lifting member 330 is installed on the gantry 200, the output end of the lifting member 330 is connected to the lifting platform 310, and is used to drive the lifting platform 310 to move in the vertical direction, and the ejection vehicle 320 is slidably connected to the lifting platform 310 in the direction of approaching or moving away from the pool 100.

[0023] like Figure 2-3 As shown, in one embodiment, the ejection vehicle 320 includes a vehicle body 321 and a moving member, the vehicle body 321 is slidably connected to a slide groove 311 provided on a lifting platform 310, the moving member is installed on the vehicle body 321, the moving end of the moving member is connected to the lifting platform 310, and is used to drive the vehicle body 321 to move, and the first connecting end is connected to the bottom of the vehicle body 321.

[0024] To achieve the movement of the vehicle body 321 on the lifting platform 310, the traveling member in this embodiment includes a rotating shaft 322, a traveling gear 323, a rack 324, a motor 325, a first bevel gear 326 and a second bevel gear 327. The rotating shaft 322 is horizontally arranged and rotatably connected to the vehicle body 321, the traveling gear 323 is installed at the end of the rotating shaft 322, the rack 324 is arranged parallel to the slide groove 311 and fixedly arranged on the lifting platform 310, the traveling gear 323 is meshedly connected with the rack 324, the motor 325 is installed on the top of the vehicle body 321, the output end of the motor 325 is connected to the first bevel gear 326, the second bevel gear 327 is installed on the rotating shaft 322, and the first bevel gear 326 and the second bevel gear 327 are meshedly connected.

[0025] The first bevel gear 326 is driven to rotate by the motor 325. Under the meshing action of the first bevel gear 326 and the second bevel gear 327, the rotating shaft 322 connected to the second bevel gear 327 rotates, and the rotating shaft 322 drives the traveling gear 323 to rotate. Under the meshing action of the traveling gear 323 and the rack 324, the vehicle body 321 moves.

[0026] It is understandable that the above-mentioned moving member can also be implemented by a conveyor belt or the like, as long as it can drive the vehicle body 321 to move in a horizontal direction, and the embodiment of the present invention does not limit this.

[0027] The lifting member 330 in this embodiment includes four lifting cylinders, and the four lifting cylinders are all installed on the gantry 200 . The output ends of the four lifting cylinders are respectively connected to the four corners of the lifting platform 310 .

[0028] Of course, in other preferred embodiments, the lifting member 330 may also be driven by a lead screw or the like to drive the lifting platform 310 to move in the vertical direction.

[0029] The connection assembly 400 in this embodiment is used to achieve rapid connection and separation between the ejection vehicle 320 and the bow M. Specifically, the connection assembly 400 includes a first connection portion 410, a second connection portion 420 and a control portion 430, the first connection portion 410 is connected to the ejection vehicle 320, the second connection portion 420 is used to connect to the bow M, and the control portion 430 can control the first connection portion 410 and the second connection portion 420 to connect or separate.

[0030] In some embodiments, the connecting component can adopt the principle of magnetic attraction. One of the first connecting part and the second connecting part has an electromagnet, and the other has an iron block. The control part is a control circuit connected to the electromagnet. By cutting off the power to the electromagnet, the electromagnet loses its magnetism, thereby separating the first connecting part and the second connecting part.

[0031] Specific as Figure 4 As shown, in one embodiment, the first connecting part 410 includes a connecting rod 411 and an electromagnet 412, and the second connecting part 420 includes an iron block 421 and a spherical block 422. The top end of the connecting rod 411 is fixedly connected to the bottom of the ejection vehicle 320, and the bottom end of the connecting rod 411 is fixedly connected to the electromagnet 412. A spherical groove is provided at the bottom of the iron block 421, and the spherical block 422 is embedded in the spherical groove. The bottom of the iron block 421 is fixedly connected to the bow M.

[0032] It is easy to understand that if the bow is an iron structure, the second connecting part can be cancelled, that is, the connecting assembly only includes the first connecting part and the control part, and the electromagnet is directly magnetically attracted to the bow.

[0033] In other embodiments, the connection component can also be implemented by a connection method of a buckle and a slot. Specifically, the buckle is movably connected to the bottom of the ejection vehicle 320, the slot is formed on the bow M, and the control unit controls the action of the buckle to complete the function of connecting or separating with the slot.

[0034] Of course, the connection assembly can also use a mechanical gripper structure to achieve a detachable connection between the ejection vehicle 320 and the bow M.

[0035] In order to explore the slamming characteristics of the bow M under different postures, in one embodiment, the connecting assembly 400 also includes a posture adjusting member 440, which is installed at the bottom of the ejection vehicle 320, and the output end of the posture adjusting member 440 can abut against the bow M to adjust the heel angle and / or pitch angle of the bow M.

[0036] The attitude adjustment member 440 in this embodiment includes four lifting cylinders 441 and four lifting balls 442. The four lifting cylinders 441 are arranged along the circumference of the connecting rod 411 and are fixedly connected to the bottom of the ejection vehicle 320. The bottom ends of the four lifting cylinders 441 are output ends and can move in the vertical direction. The output ends of the four lifting cylinders 441 are respectively connected to the four lifting balls 442, and the four lifting balls 442 can abut against the bow M.

[0037] By adjusting the travel distance of the output ends of the four lifting cylinders 441, that is, the four lifting balls 442 can drive the spherical block 422 on the bow M to rotate around the spherical groove to any angle, so that the bow M can be adjusted to any posture.

[0038] like Figure 2-3 As shown, in order to facilitate the control of the ejection vehicle 320 to move to the specified position on the lifting platform 310 so that the electromagnet 412 can be immediately powered off, in one embodiment, the control unit 430 also includes a contact switch 431 and a limit block 432. The limit block 432 is installed on the lifting platform 310 and is located on the moving path of the ejection vehicle 320. The contact switch 431 is installed on a side of the ejection vehicle 320 close to the limit block 432. The contact switch 431 is electrically connected to the electromagnet 412. The contact switch 431 is configured to be triggered when it contacts the limit block 432, and the electromagnet 412 is switched from a powered-on state to a powered-off state.

[0039] In this embodiment, the limit block 432 is slidably connected to the lifting platform 310, and the moving path of the limit block 432 overlaps with the moving path of the ejection vehicle 320. The connecting assembly 400 also includes a limit screw, and the free end of the limit screw passes through the threaded hole opened on the limit block 432 and can abut against the lifting platform 310.

[0040] The sliding limit block 432 is moved to a predetermined position on the lifting platform 310 and fixed by a limit screw. The initial position of the limit block 432 and the ejection vehicle 320 is the travel distance of the ejection vehicle 320. When the ejection vehicle 320 moves to the point where the contact switch 431 thereon contacts with the limit block 432, the contact switch 431 is triggered, the electromagnet 412 is powered off, and the bow M is separated from the ejection vehicle 320.

[0041] In one embodiment, the contact switch 431 is electrically connected to the ejection vehicle 320, and the contact switch 431 is configured to be triggered when it contacts the limit block 432, and the ejection vehicle 320 is powered off and stops moving. This can prevent the motor 325 from continuously working, causing the travel gear 323 and the rack 324 to be locked, thereby affecting the service life of the motor 325.

[0042] Compared with existing technologies: 1) The height of the bow M entering the water can be adjusted by the provided lifting member 330; 2) The catapult vehicle 320 can be used to control the initial horizontal velocity of the bow M when entering the water; 3) The connection assembly 400 is provided to realize the rapid connection and separation of the bow M and the ejection vehicle 320, and the heel and pitch angles of the bow M entering the water can be adjusted to explore the slamming characteristics of the bow structure under different postures.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A bow structure oblique water entry slamming test device, characterized in that: include: pool; a gantry disposed across the pool; An ejection assembly, comprising a lifting platform, an ejection vehicle and an ejection member, wherein the lifting member is mounted on the gantry, an output end of the lifting member is connected to the lifting platform to drive the lifting platform to move in a vertical direction, and the ejection vehicle is slidably connected to the lifting platform in a direction approaching or moving away from the pool; A connecting assembly, through which the bow can be connected to or separated from the ejection vehicle.

2. The bow structure oblique water entry slamming test device according to claim 1 is characterized in that: The ejection vehicle comprises a vehicle body and a moving member, wherein the vehicle body is slidably connected to a slide groove provided on the lifting platform, the moving member is mounted on the vehicle body, and a moving end of the moving member is connected to the lifting platform for driving the vehicle body to move.

3. The bow structure oblique water entry slamming test device according to claim 2 is characterized in that: The traveling member includes a rotating shaft, a traveling gear, a rack, a motor, a first bevel gear and a second bevel gear. The rotating shaft is horizontally arranged and rotatably connected to the vehicle body. The traveling gear is installed at the end of the rotating shaft. The rack is arranged parallel to the slide groove and fixedly arranged on the lifting platform. The traveling gear is meshed with the rack. The motor is installed on the top of the vehicle body. The output end of the motor is connected to the first bevel gear. The second bevel gear is installed on the rotating shaft. The first bevel gear and the second bevel gear are meshed.

4. The bow structure oblique water entry slamming test device according to claim 1, characterized in that: The connection assembly includes a first connection part, a second connection part and a control part, the first connection part is connected to the ejection vehicle, the second connection part is used to connect to the bow, and the control part can control the first connection part and the second connection part to connect or separate.

5. The bow structure oblique water entry slamming test device according to claim 4 is characterized in that: The first connecting part includes a connecting rod and an electromagnet, and the second connecting part includes an iron block and a spherical block. The top end of the connecting rod is fixedly connected to the bottom of the ejection vehicle, and the bottom end of the connecting rod is fixedly connected to the electromagnet. A spherical groove is provided at the bottom of the iron block, and the spherical block is embedded in the spherical groove. The bottom of the iron block is fixedly connected to the bow.

6. The bow structure oblique water entry slamming test device according to claim 5 is characterized in that: The connecting assembly also includes a posture adjusting member, which is installed at the bottom of the ejection vehicle. The output end of the posture adjusting member can abut against the bow of the ship to adjust the heel angle and / or pitch angle of the bow of the ship.

7. The bow structure oblique water entry slamming test device according to claim 6 is characterized in that: The attitude adjustment component includes four lifting cylinders and four lifting balls. The four lifting cylinders are arranged along the circumference of the connecting rod and are fixedly connected to the bottom of the ejection vehicle. The bottom ends of the four lifting cylinders are output ends and can move in the vertical direction. The output ends of the four lifting cylinders are respectively connected to four lifting balls, and the four lifting balls can abut against the bow of the ship.

8. The bow structure oblique water entry slamming test device according to claim 5, characterized in that: The control unit includes a contact switch and a limit block, wherein the limit block is installed on the lifting platform and is located on the moving path of the ejection vehicle, and the contact switch is installed on a side of the ejection vehicle close to the limit block. The contact switch is electrically connected to the electromagnet, and the contact switch is configured to be triggered when it contacts the limit block, and the electromagnet switches from a power-on state to a power-off state.

9. The bow structure oblique water entry slamming test device according to claim 8, characterized in that: The limit block is slidably connected to the lifting platform, and the moving path of the limit block overlaps with the moving path of the ejection vehicle. The connecting assembly also includes a limit screw, and the free end of the limit screw passes through the threaded hole opened on the limit block and can abut against the lifting platform.

10. The bow structure oblique water entry slamming test device according to claim 8, characterized in that: The contact switch is electrically connected to the ejection vehicle, and the contact switch is configured to be triggered when it contacts the limit block, and the ejection vehicle is powered off and stops moving.

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