A structure entering water experimental device and experimental method thereof

Abstract

The present application discloses a structure entry into water experimental device and an experimental method thereof. The device comprises: a support frame, a storage container is arranged inside the support frame; a drive assembly, the drive assembly is arranged on the support frame; a tensioning pulley block, a traction member is wound around the tensioning pulley block, one end of the traction member is connected to the drive assembly, and the traction member is used to pull the impact load test piece; a direction adjustment pulley block, the direction adjustment pulley block is arranged at the bottom of the storage container; a tension detection assembly, the tension detection assembly is arranged on the support frame, and the traction member sequentially bypasses the drive assembly, the tensioning pulley block, the direction adjustment pulley block and the tension detection assembly; a controller, the controller is electrically connected to the drive assembly and the tension detection assembly respectively. According to the embodiment of the present application, a full-condition structure entry into water experiment with controllable speed and controllable acceleration is provided, and at the same time, the impact load of the structure entering water can be accurately calculated, and the analysis results of the structure entering water problem can be optimized.

Description

Technical Field

[0001] The present application belongs to the technical field of experimental devices, and in particular, relates to a structure-entering-water experimental device and an experimental method thereof. Background Art

[0002] The problem of structure entering water is characterized by strong nonlinearity and strong fluid-solid coupling between solid-liquid-gas. It is difficult to accurately analyze it with the help of Li Lu, and the computational complexity of numerical analysis is very large and the cycle is too long. Therefore, experiments have become a reliable and efficient means of analysis for the problem of structure entering water.

[0003] At present, a structural water entry test device is usually used to study and analyze the impact load of the structure entering water. The existing structural water entry test device usually uses a screw transmission to drive the structure into the water to realize the analysis of the structure entering water problem. However, the screw is usually a reduction gear set, which leads to a relatively low water entry speed. It is impossible to achieve the functions of high-speed water entry, stable water entry posture and real-time capture of impact loads, and cannot provide effective analysis for some structural high-speed water entry experiments. Summary of the invention

[0004] The embodiment of the present application provides a structure entry into water experimental device and an experimental method thereof, which can realize controllable structure entry into water speed, provide a structure entry into water experiment under full working conditions, and can also accurately calculate the impact load of the structure entering water, and optimize the analysis results of the structure entry into water problem.

[0005] On the one hand, an embodiment of the present application provides a structure-immersion experimental device, the device comprising:

[0006] A support frame, wherein a storage container is arranged inside the support frame;

[0007] A driving assembly, wherein the driving assembly is arranged on the supporting frame;

[0008] A tensioning pulley block, on which a traction member is wound, one end of which is connected to the driving assembly, and the traction member is used to pull the impact load test piece;

[0009] A direction-adjusting pulley block, wherein the direction-adjusting pulley block is arranged at the bottom of the storage container;

[0010] A tension detection assembly, wherein the tension detection assembly is arranged on the support frame, and the traction member sequentially passes through the drive assembly, the tension pulley block, the direction adjustment pulley block and the tension detection assembly;

[0011] A controller, the controller being electrically connected to the driving assembly and the tension detection assembly respectively;

[0012] The driving assembly is used to drive the traction member to move, so that the traction member drives the impact load test piece to perform an impact load measurement experiment;

[0013] The tension detection component is used to detect the horizontal tension of the traction member in the horizontal direction and the vertical tension in the vertical direction, and transmit the detected horizontal tension and vertical tension to the controller;

[0014] The controller is used to control the start-up of the driving component and obtain the driving torque of the driving component, so that the driving component drives the traction member to move, and completes the impact load measurement experiment of the impact load test piece;

[0015] The controller is also used to receive the horizontal tension and the vertical tension detected by the tension detection assembly, and determine the impact load of the impact load test piece according to the horizontal tension, the vertical tension and the driving torque.

[0016] Optionally, a placement bracket is provided on the support frame;

[0017] The drive assembly comprises:

[0018] A driving motor is arranged on the placing bracket, the traction member sequentially passes around the output shaft of the driving motor and the tensioning pulley group, and the driving motor is electrically connected to the controller.

[0019] Optionally, the driving assembly further includes:

[0020] A torque sensor is electrically connected to the controller, and is used to detect the driving torque output by the driving motor.

[0021] Optionally, the driving assembly comprises:

[0022] A mounting block, the mounting block is fixedly connected to the driving motor, first mounting plates are vertically arranged on both sides of the mounting block, and second mounting plates are slidably connected to the two first mounting plates;

[0023] The tensioning pulley block comprises:

[0024] A first tensioning pulley, wherein the first tensioning pulley is arranged on a first mounting plate at one side;

[0025] a second tensioning pulley, the second tensioning pulley being disposed on the second mounting plate;

[0026] a third tensioning pulley, the third tensioning pulley being arranged on the same side as the first tensioning pulley and on the same first mounting plate;

[0027] The traction member passes around the first tensioning pulley, the second tensioning pulley and the third tensioning pulley in sequence.

[0028] Optionally, a sliding hole is provided on the second mounting plate, and the second tensioning pulley passes through the sliding hole and is slidably connected to the second mounting plate.

[0029] Optionally, the direction-adjusting pulley block comprises:

[0030] A first direction adjusting pulley, wherein the first direction adjusting pulley is arranged at the bottom of the storage container, and the first direction adjusting pulley, the first tensioning pulley and the third tensioning pulley are on the same vertical line;

[0031] a second direction adjusting pulley, wherein the second direction adjusting pulley is disposed at the bottom of the storage container;

[0032] The traction member sequentially passes around the first direction adjusting pulley and the second direction adjusting pulley.

[0033] Optionally, the first direction adjusting pulley and the second direction adjusting pulley are on the same horizontal plane.

[0034] Optionally, a third mounting plate is provided on the support frame;

[0035] The tension detection component comprises:

[0036] A wire wheel, the wire wheel is arranged on the third mounting plate;

[0037] The traction member sequentially passes around the guide wheel, the tension pulley group and the driving assembly;

[0038] A tension sensor is disposed on the third mounting plate; the tension sensor is electrically connected to the controller, and the tension sensor can detect the horizontal tension and vertical tension of the traction member.

[0039] Optionally, the tension sensor includes a first tension sensor and a second tension sensor;

[0040] A detection plate is arranged on the wire wheel, the first tension sensor and the second tension sensor are both arranged on the detection plate, and the first tension sensor can detect the horizontal tension of the traction member, and the second tension sensor can detect the vertical tension of the traction member.

[0041] Optionally, the first tension sensor and the second tension sensor are both movably connected to the third mounting plate.

[0042] Optionally, the tension sensor comprises a six-axis sensor, the six-axis sensor is coaxially arranged with the axis of the guide wheel, and the six-axis sensor can detect the horizontal tension and vertical tension of the traction member.

[0043] On the other hand, an embodiment of the present application provides a structure submersion test method, the method comprising:

[0044] The controller controls the drive component to start;

[0045] The driving assembly drives the traction member to move on the tensioning pulley block, the direction adjustment pulley block and the tension detection assembly, so that the traction member drives the impact load test piece to perform the water entry test;

[0046] When the impact load test piece is subjected to a water entry test, the controller obtains the driving torque of the driving component, the horizontal tension of the traction member in the horizontal direction, and the vertical tension in the vertical direction;

[0047] The controller determines the impact load of the impact load test piece according to the horizontal tension, the vertical tension and the driving torque.

[0048] Optionally, the controller determines the impact load of the impact load test piece according to the horizontal tension, the vertical tension and the driving torque, including:

[0049]

[0050] Where P is the impact load, m is the mass of the impact load test piece, g is the gravitational acceleration, K is the inertia ratio of the common wheel, which is used to indicate the ratio of the inertia of the common wheel to the inertia of the guide wheel, wherein the common wheel may include the sum of the tensioning pulley group, the driving pulley, the first direction adjusting pulley and the second direction adjusting pulley; m is the inertia ratio of the impact load test piece, which is used to express the ratio of the inertia of the impact load test piece to the inertia of the wire pulley; is the difference between the first tension sensor and the second tension sensor, which has the effect of offsetting the influence of the preload force, M is the driving torque of the driving motor, is the radius of the ordinary wheel, is the interference force constant of the common wheel, which is used to indicate the effect of the torque on the common wheel; is the wire pulley interference force constant, which is used to indicate the effect of the torque acting on the wire pulley.

[0051] Optionally, when the traction member drives the impact load test piece to enter a free fall state to complete a water entry test under free fall, the method further includes:

[0052] The controller determines the free fall driving torque of the driving assembly according to the horizontal tension and the vertical tension;

[0053] The controller controls the driving assembly in real time according to the free-fall driving torque to ensure that the impact load test piece maintains a free-fall state.

[0054] Optionally, the controller determines the free fall driving torque of the driving assembly according to the horizontal tension and the vertical tension, comprising:

[0055]

[0056] in, is the mass of the wire wheel, g is the acceleration due to gravity, is the inertia ratio of the common wheel, which is used to represent the ratio of the inertia of the common wheel to the inertia of the wire wheel, wherein the common wheel may include the sum of the tensioning pulley group, the driving pulley, the first direction adjusting pulley and the second direction adjusting pulley; is the difference between horizontal tension and vertical tension, which has the effect of offsetting the influence of preload. M is the free fall driving torque of the drive assembly. is the radius of the ordinary wheel, is the interference force constant of the common wheel, which is used to indicate the effect of the torque on the common wheel; is the wire pulley interference force constant, which is used to indicate the effect of the torque acting on the wire pulley.

[0057] The structural water entry experimental device and the experimental method thereof of the embodiment of the present application can control the water entry speed of the impact load test piece driven by the traction member by adjusting the driving torque of the driving component during the impact load measurement experiment, so as to realize the control of uniform acceleration and uniform deceleration. Then, before the impact load test piece is impacted by entering the water, the tensioning pulley group and the direction adjustment pulley group are adjusted according to the experimental requirements to ensure that the traction member is in a tensioned state and maintains a horizontal state and a vertical state during the impact load measurement experiment. Then, the horizontal tension and the vertical tension of the traction member are detected by the tension detection component, and the impact load of the impact load test piece when entering the water is obtained by the horizontal tension, the vertical tension and the driving torque. The structural water entry experimental device can be used to freely set the water entry speed. At the same time, by adjusting the tensioning pulley group and the direction adjustment pulley group, the water entry posture of the impact test piece can be ensured, thereby reducing the difficulty of theoretical analysis. In addition, the real-time acquisition of horizontal tension, vertical tension and driving torque can obtain real-time impact load, thereby providing strong assistance for analyzing the structural water entry problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0059] Figure 1 It is a structural block diagram of a structure entry water experimental device provided by an embodiment of the present application;

[0060] Figure 2 It is a schematic diagram of the structure of a structure-entering-water experimental device provided by an embodiment of the present application;

[0061] Figure 3 This is a schematic diagram of a structure of an embodiment of the present application for showing the structure of a driving assembly, a direction adjustment pulley assembly and a tension detection assembly;

[0062] Figure 4 It is a principle analysis diagram of an embodiment of the present application in which a plurality of fixed pulleys are equivalent to one fixed pulley;

[0063] Figure 5 It is a force analysis diagram provided by an embodiment of the present application;

[0064] Figure 6 It is a flow chart of a structure entry into water test method provided by an embodiment of the present application;

[0065] Description of reference numerals:

[0066] 1. Support frame; 11. Storage container; 12. Placement bracket; 13. Third mounting plate; 131. First slide rail; 132. Second slide rail; 14. Seismic isolation pad; 2. Drive assembly; 21. Drive motor; 22. Torque sensor; 23. Drive pulley; 24. Mounting block; 25. First mounting plate; 251. Strip hole; 26. Second mounting plate; 261. Sliding hole; 3. Tensioning pulley group; 31. First tensioning pulley; 32. Second tensioning pulley; 33. Third tensioning pulley; 4. Traction member; 5. Direction adjustment pulley group; 51. First direction adjustment pulley; 52. Second direction adjustment pulley; 6. Tension detection assembly; 61. Guide wheel; 62. Tension sensor; 621. First tension sensor; 622. Second tension sensor; 623. Six-axis sensor; 63. Detection board; 7. Controller. DETAILED DESCRIPTION

[0067] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0069] In order to solve the problems of the prior art, the embodiment of the present application provides a structure entry test device. When performing the structure entry test, the driving torque of the driving component is adjusted to control the entry speed of the traction member driving the impact load test piece to achieve uniform acceleration and uniform deceleration control, and then before the impact load test piece enters the water for impact, the tensioning pulley group and the direction adjustment pulley group are adjusted according to the experimental requirements to ensure that the traction member is in a tensioned state and maintains a horizontal state and a vertical state during the impact load measurement experiment, and then the horizontal tension and vertical tension of the traction member are detected by the tension detection component, and the impact load of the impact load test piece when entering the water is obtained by the horizontal tension, vertical tension and driving torque. The structure entry test device can be used to freely set the entry speed, and at the same time, the tensioning pulley group and the direction adjustment pulley group can be adjusted to ensure the entry posture of the impact test piece, reduce the difficulty of theoretical analysis, and obtain the horizontal tension, vertical tension and driving torque in real time to obtain the real-time impact load, which provides strong help for analyzing the structure entry problem.

[0070] The following is an introduction to the structure water entry experimental device provided in the embodiment of the present application.

[0071] Figure 1A schematic structural diagram of a structure-immersion experimental device is shown, and the structure-immersion experimental device may include: a support frame 1, a drive component 2, a tensioning pulley group 3, a direction adjustment pulley group 5, a tension detection component 6 and a controller 7.

[0072] In this embodiment, the support frame 1 is placed on the ground, and a storage container 11 is arranged inside the support frame 1 . The storage container 11 stores liquid for performing an impact load measurement experiment.

[0073] The driving component 2 is fixedly connected to the top of the supporting frame 1, and the tensioning pulley block 3 is arranged on the driving component 2. The tensioning pulley block 3 is wound with a traction member 4. The driving component 2 can drive the traction member 4 to move on the tensioning pulley block 3 so that the traction member 4 pulls the impact load test piece to complete the impact load measurement experiment.

[0074] The direction-adjusting pulley block 5 is arranged at the inner bottom of the storage container 11 to ensure the water-entering posture of the traction member 4; the tension detection component 6 is arranged on the support frame 1, and the traction member 4 bypasses the driving component 2, the tensioning pulley block 3, the direction-adjusting pulley block 5 and the tension detection component 6 to form a closed figure to ensure that the traction member 4 can drive the impact load to rise and fall.

[0075] It is worth noting that the impact load test piece is arranged between the tensioning pulley block 3 and the direction adjusting pulley block 5 to achieve vertical lifting to measure the impact load of the impact load test piece.

[0076] In this embodiment, the controller 7 is electrically connected to the driving assembly 2 and the tension detection assembly 6 respectively.

[0077] In some embodiments, the driving component 2 is used to drive the traction member 4 to move so that the traction member 4 drives the impact load test piece to perform an impact load measurement experiment; the tensioning pulley group 3 is used to adjust the tension of the traction member 4, and the direction adjustment pulley group 5 is used to change the direction of the traction member 4 to adjust to a state suitable for detecting horizontal tension and vertical tension, so as to facilitate the tension detection component 6 to detect horizontal tension and vertical tension. After the tension detection component 6 detects the horizontal tension and vertical tension, it transmits the detected horizontal tension and vertical tension to the controller 7, and the controller 7 determines the impact load based on the received horizontal tension, vertical tension and driving torque.

[0078] When conducting an impact load measurement experiment, first, the controller 7 controls the speed at which the traction member 4 drives the impact load test piece to enter the water by adjusting the driving torque of the driving component 2, so as to achieve uniform acceleration and uniform deceleration control. Then, before the impact load test piece enters the water for impact, the tensioning pulley group 3 and the direction adjustment pulley group 5 are adjusted according to the experimental requirements to ensure that the traction member 4 is in a tensioned state and remains in a horizontal state and a vertical state during the impact load measurement experiment. Then, the horizontal tension and vertical tension of the traction member 4 are detected by the tension detection component 6, and the impact load of the impact load test piece when entering the water is obtained through the horizontal tension, vertical tension and driving torque. The application of this structural water entry experimental device can freely set the water entry speed. At the same time, by adjusting the tensioning pulley group 3 and the direction adjustment pulley group 5, the water entry posture of the impact test piece can be guaranteed, thereby reducing the difficulty of theoretical analysis. In addition, real-time acquisition of horizontal tension, vertical tension and driving torque can obtain real-time impact load, thereby providing powerful assistance for analyzing structural water entry problems.

[0079] In some embodiments, as an example, the storage container 11 may be a water tank, and water is used as the liquid in the impact load measurement experiment to measure the impact load when the impact load test piece enters the water.

[0080] In some embodiments, as an example, the traction member 4 can be a rope, which sequentially passes around the drive component 2, the tensioning pulley group 3, the direction adjustment pulley group 5 and the tension detection component 6 to form a closed figure, that is, the rope forms a closed circle, driving the impact load test piece to move along the closed figure.

[0081] In some embodiments, in order to ensure the stability of data during impact load measurement experiments, the water tank needs to be kept stable, so a seismic isolation pad 14 is provided at the bottom of the storage container 11, and the seismic isolation pad 14 is fixed to the ground by bolts. The seismic isolation pad 14 can reduce the impact of ground vibration on the water tank, thereby ensuring the stability of data detection.

[0082] In some embodiments, reference Figure 2 A placement bracket 12 is fixedly connected to the top of the support frame 1, and the driving assembly 2 may include a driving motor 21 fixedly connected to the placement bracket 12. The traction member 4 bypasses the output shaft of the driving motor 21, and the driving motor 21 is electrically connected to the controller 7.

[0083] When the driving assembly 2 drives the traction member 4 to move, the controller 7 controls the driving motor 21 to start, and the output shaft of the driving motor 21 rotates, driving the traction member 4 to start moving, so that the traction member 4 drives the impact load test piece to perform an impact load measurement experiment.

[0084] In this embodiment, the type of the driving motor 21 can be a servo motor, and the controller 7 can control the driving torque of the servo motor. By adjusting the driving torque, the moving speed of the traction member 4 can be changed, thereby realizing the speed control of the impact load test piece in the impact load measurement experiment, that is, realizing the uniform acceleration or uniform deceleration structure entering the water experiment. At the same time, by changing the driving torque output by the servo motor, the purpose of variable speed entering the water can be achieved, thereby realizing the impact load measurement experiment under all speed conditions.

[0085] In some embodiments, in order to more conveniently control the driving torque output by the driving motor 21, the driving assembly 2 may further include:

[0086] The torque sensor 22 is fixedly connected to the output shaft of the driving motor 21 , and the torque sensor 22 is electrically connected to the controller 7 .

[0087] In this embodiment, the torque sensor 22 is used to detect the driving torque output by the driving motor 21 .

[0088] When the controller 7 controls the driving of the driving motor 21 , the controller 7 may directly obtain the driving torque detected by the torque sensor 22 to achieve torque control of the driving motor 21 .

[0089] In order to facilitate the driving motor 21 to drive the traction member 4 to move and reduce the possibility of the traction member 4 slipping during the movement, a driving pulley 23 is fixedly connected to the output shaft of the driving motor 21. The driving pulley 23 can increase the friction between the traction member 4 and the driving pulley 23, thereby reducing the possibility of the driving motor 21 idling during the process of the traction member 4 driving the impact load test piece to move, that is, the possibility of the driving motor 21 idling but unable to drive the traction member 4 to move.

[0090] In some other embodiments, the driving assembly 2 may further include a mounting block 24, which is fixedly connected to the driving motor 21, and the torque sensor 22 is disposed inside the mounting block 24, a first mounting plate 25 is vertically disposed on both sides of the mounting block 24, and a second mounting plate 26 is slidably connected between the two first mounting plates 25.

[0091] In this embodiment, in order to more conveniently adjust the tension of the traction member 4, the tensioning pulley block 3 may include:

[0092] A first tensioning pulley 31, the first tensioning pulley 31 is fixedly connected to the first mounting plate 25 on one side;

[0093] A second tensioning pulley 32, the second tensioning pulley 32 is fixedly connected to the second mounting plate 26;

[0094] The third tensioning pulley 33 is arranged on the same side as the first tensioning pulley 31 and is fixedly connected to the first mounting plate 25 . The third tensioning pulley 33 and the first tensioning pulley 31 are respectively fixed at two ends of the first mounting plate 25 .

[0095] It is worth noting that the traction member 4 passes around the first tensioning pulley 31 , the second tensioning pulley 32 and the third tensioning pulley 33 in sequence.

[0096] In this embodiment, the first tensioning pulley 31 can change the direction in which the driving motor 21 of the traction member 4 extends, so as to facilitate the adjustment of the tension of the traction member 4; when the tension of the traction member 4 needs to be adjusted, the position of the second tensioning pulley 32 can be adjusted to change the tension of the traction member 4; the third tensioning pulley 33 can change the direction of the traction member 4, so as to ensure that the entry posture of the impact load test piece into the water is in a vertical state.

[0097] In some other embodiments, the tension of the traction member 4 can be adjusted by using a plurality of tensioning pulley sets 3 .

[0098] Furthermore, in order to more conveniently adjust the tension of the traction member 4 , a sliding hole 261 is provided on the second mounting plate 26 , and the second tensioning pulley 32 passes through the sliding hole 261 and is slidably connected to the second mounting plate 26 .

[0099] When the tension of the traction member 4 needs to be adjusted, the distance between the second tensioning pulley 32 and the first tensioning pulley 31 and the third tensioning pulley 33 can be changed by changing the position of the second tensioning pulley 32 in the sliding hole 261, thereby adjusting the tension of the traction member 4.

[0100] In some other embodiments, strip holes 251 may be opened on the two first mounting plates 25, and the strip holes 251 are opened along the length direction of the first mounting plates 25, that is, the position of the second mounting plate 26 can be adjusted to adjust the distance between the second tensioning pulley 32 and the first tensioning pulley 31 and the third tensioning pulley 33, thereby adjusting the tension of the traction member 4.

[0101] In some embodiments, in order to ensure the entry posture of the impact load test piece, the direction adjustment pulley group 5 may include:

[0102] A first direction adjusting pulley 51, which is disposed at the bottom of the storage container 11, and the first direction adjusting pulley 51, the first tensioning pulley 31 and the third tensioning pulley 33 are on the same vertical line;

[0103] The second direction adjusting pulley 52 is disposed at the bottom of the storage container 11 .

[0104] In this embodiment, the traction member 4 passes around the first direction adjustment pulley 51 and the second direction adjustment pulley 52 in sequence, wherein the first direction adjustment pulley 51 is used to ensure that the traction member 4 remains in a vertical state so that the impact load test piece can enter the water vertically.

[0105] In some other embodiments, in order to more conveniently measure the horizontal tension and vertical tension of the traction member 4, the second direction adjusting pulley 52 and the first direction adjusting pulley 51 are located in the same horizontal plane.

[0106] In this embodiment, the first tensioning pulley 31, the third tensioning pulley 33 and the first direction adjusting pulley 51 can ensure that the traction member 4 is in a vertical state, and the first direction adjusting pulley 51 and the second direction adjusting pulley 52 can ensure that after adjusting the direction of the traction member 4, it can always be in the horizontal direction and the vertical direction.

[0107] In some other embodiments, in order to more conveniently detect the horizontal tension and vertical tension of the traction member 4, a third mounting plate 13 is fixedly connected to the support frame 1, and the tension detection assembly 6 may include:

[0108] The wire wheel 61 is fixedly connected to the third mounting plate 13 , and the wire wheel 61 and the second direction adjusting pulley 52 are on the same vertical line. After the traction member 4 passes through the second direction adjusting pulley 52 , it passes through the first tensioning pulley 31 and the driving pulley 23 in sequence.

[0109] In order to conveniently detect the horizontal tension and vertical tension of the traction member 4 , a tension sensor 62 is installed on the third mounting plate 13 . The tension sensor 62 is electrically connected to the controller 7 . The tension sensor 62 can detect the horizontal tension and vertical tension of the traction member 4 .

[0110] In this embodiment, in order to more accurately detect the horizontal tension and vertical tension of the traction member 4, the tension sensor 62 may include a first tension sensor 621 and a second tension sensor 622. A detection plate 63 is provided on the wire wheel 61. The first tension sensor 621 and the second tension sensor 622 are both fixedly connected to the detection plate 63. Moreover, the first tension sensor 621 can detect the horizontal tension of the traction member 4, and the second tension sensor 622 can detect the vertical tension of the traction member 4.

[0111] In this embodiment, when detecting the tension of the traction member 4, the controller 7 controls the drive motor 21 to start, the drive motor 21 drives the drive pulley 23 to rotate, and the drive pulley 23 drives the traction member 4 to move along the first tensioning pulley 31, the second tensioning pulley 32 and the third tensioning pulley 33, thereby driving the impact load test piece to move vertically downward and enter the water. In the process of the impact load entering the water, the first tension sensor 621 detects the horizontal tension of the traction member 4, and the second tension sensor 622 detects the vertical tension of the traction member 4, and sends the horizontal tension and vertical tension to the controller 7. The controller 7 determines the impact load based on the horizontal tension, vertical tension and driving torque.

[0112] In some embodiments, the first tension sensor 621 and the second tension sensor 622 can both detect the horizontal tension and vertical tension of the traction member 4. However, due to the different installation positions and the traction member 4 moving, the wire wheel 61 may be slightly moved, resulting in the vertical tension detected by the first tension sensor 621 being inaccurate and the horizontal tension detected by the second tension sensor 622 being inaccurate. At the same time, it will also affect the first tension sensor 621 detecting the horizontal tension of the traction member 4. Therefore, in order to be able to more accurately detect the horizontal tension and vertical tension of the traction member 4.

[0113] In this embodiment, the first tension sensor 621 and the second tension sensor 622 are both movably connected to the third mounting plate 13 .

[0114] Specifically, the first slide rail 131 and the second slide rail 132 can be fixedly connected to the third mounting plate 13, wherein the first slide rail 131 is horizontally placed on the third mounting plate 13, and the second slide rail 132 is vertically placed on the third mounting plate 13, the first tension sensor 621 is slidably connected to the second slide rail 132, and the second tension sensor 622 is slidably connected to the first slide rail 131.

[0115] During the movement of the traction member 4, the traction member 4 drives the guide wheel to move slightly in the horizontal direction and / or vertical direction. Therefore, during the slight movement of the wire wheel 61, the detection plate 63 can drive the first tension sensor 621 or the second tension sensor 622 to move along the corresponding slide rail respectively to overcome the interference of tension in different directions.

[0116] For example, for the first tension sensor 621, the first tension sensor 621 detects the horizontal tension of the traction member 4, so it needs to overcome the vertical movement. At this time, the detection plate 63 can drive the first tension sensor 621 to move slightly in the vertical direction on the second slide rail 132 to ensure that the vertical tension detected by the first tension sensor 621 is zero.

[0117] It is worth noting that although the wire wheel 61 is fixedly connected to the third mounting plate 13, in actual application, the traction member 4 will inevitably vibrate the wire wheel 61 during movement, so that the tension detected by the tension sensor 62 will be affected in different directions. Therefore, a relatively movable connection is set to ensure that the tension sensor 62 can maintain a relatively static state with the wire wheel 61 to obtain more accurate horizontal tension and vertical tension.

[0118] In some other embodiments, the tension sensor 62 may further include a six-axis sensor 623 , which is coaxially arranged with the axis of the guide wheel 61 , and the six-axis sensor 623 can detect the horizontal tension and vertical tension of the traction member 4 .

[0119] In this embodiment, the horizontal tension and the vertical tension of the traction member 4 can be directly detected by the six-axis sensor 623, so that the horizontal tension and the vertical tension can be detected more conveniently and quickly.

[0120] In the embodiments provided in the present application, in order to more conveniently understand the principle of the solution provided in the present application, the calculation principle of the structure water entry experimental device provided in the present application is introduced below.

[0121] In order to simplify the principle derivation process, the multiple fixed pulleys of the tensioning pulley group are simplified first. The following is the simplification process:

[0122] Reference Figure 4 In this embodiment, taking fixed pulley A, fixed pulley B and fixed pulley C as examples, the radius and moment of inertia of fixed pulley A, fixed pulley B and fixed pulley C are respectively recorded as r A 、r B 、r C and J A , J B , J C , the corresponding torque is M A 、M B 、M C , the rotation angles are θ A ,θ B ,θ C , the linear displacements of the three fixed pulleys are l a , l b , where Ia and Ib are the linear displacements of the same traction member on different fixed pulleys.

[0123] Since the tension on the traction member is always in the direction of the traction member being tightened, we only need to pay attention to the magnitude of the tension during analysis. Therefore, it can be converted into the case where the traction tension of the two sets of fixed pulleys (a) and (b) are both T1, and the radius and moment of inertia of the three fixed pulleys A, B and C meet certain conditions, so that the driven tension T3 and the driven tension T4 are equal.

[0124] The force analysis of each fixed pulley machine yields the following formulas (1)-(3):

[0125] (1)

[0126] (2)

[0127] (3)

[0128] Among them, T1 is the driving tension output by the driving motor, r A 、r B 、r C and J A , J B , J C are the radius and moment of inertia of fixed pulley A, fixed pulley B and fixed pulley C respectively, M A 、M B 、M C is the action torque, , are the angular accelerations of fixed pulley A, fixed pulley B and fixed pulley C respectively.

[0129] From the set relationship, it can be seen that the linear displacement and angular displacement satisfy the following relations (4)-(6):

[0130] (4)

[0131] (5)

[0132] (6)

[0133] in, for Figure 4 The linear displacement of the fixed pulley A and the fixed pulley B, for Figure 4 Linear displacement of the fixed pulley C, , and are the radii of fixed pulley A, fixed pulley B and fixed pulley C, and is the rotation angle of fixed pulley A, fixed pulley B and fixed pulley C.

[0134] According to formula (1)-formula (6), formula (7) and formula (8) can be obtained:

[0135] (7)

[0136] (8)

[0137] From the above formulas (7) and (8), it can be seen that the simplified equivalent of the fixed pulley can be converted into a problem where T3 and T4 are equal, that is, formulas (9) and (10) are satisfied:

[0138] (9)

[0139] (10)

[0140] In this embodiment, since the fixed pulley block (a) and the fixed pulley block (b) are wound around the same traction member,: = .

[0141] Therefore, formula (9) and formula (10) can be converted into the following equation group (11):

[0142] (11)

[0143] For the convenience of derivation, the radius of each fixed pulley can be made equal, and then the equation group (12) can be obtained:

[0144] (12)

[0145] That is, it can be deduced that when multiple pulleys with equal radius are connected in series, they can be equivalent to one pulley.

[0146] Therefore, in the embodiment of the present application, the first tensioning fixed pulley 31 , the second tensioning fixed pulley 31 and the third tensioning fixed pulley 31 of the tensioning pulley group 3 can be equivalent to one fixed pulley.

[0147] After the above equivalence, the fixed pulley of the structure submerged experimental device can be converted into Figure 5 Force analysis diagram shown.

[0148] exist Figure 5 In the test, the impact load test piece moves vertically downward as the positive direction, that is, the y direction is the positive direction, which is the same direction as the gravity acceleration, and the positive rotation direction of each pulley matches the y direction.

[0149] Reference Figure 5 Next, the force analysis of each fixed pulley is introduced to more clearly introduce the calculation method of impact load:

[0150] exist Figure 5 In the figure, the force analysis of the fixed pulley A (wheelA) is carried out. According to Newton's second law, we know that:

[0151] (13)

[0152] in, is the driving tension of fixed pulley A, is the driven tension of fixed pulley A, is the radius of the fixed pulley, is the friction torque, is the moment of inertia of fixed pulley A, is the angular acceleration of fixed pulley A.

[0153] Correspondingly, the force analysis of fixed pulley B can be expressed by formula (14), the force analysis of fixed pulley C can be expressed by equation group (15), the force analysis of fixed pulley D can be expressed by formula (16), the force analysis of fixed pulley E can be expressed by formula (17), and the force analysis of the impact load test piece can be expressed by formula (18):

[0154] (14)

[0155] (15)

[0156] (16)

[0157] (17)

[0158] (18)

[0159] For ease of understanding, the meaning of each letter can be found in Table 1:

[0160] Table 1 Basic physical parameters of each part of the device

[0161]

[0162] By rearranging the above formulas (13) to (18), the expression (19) for the impact load P can be obtained:

[0163] (19)

[0164] From expression (19), we can know that the impact load P is subjected to acceleration , driving tension T EF and driven tension T FA Decide.

[0165] The acceleration can be obtained by the above equations (15): :

[0166] (20)

[0167] in, is the horizontal tension detected by the first tension sensor, It is the vertical tension detected by the second tension sensor.

[0168] For driving tension T EF , we can combine the above equations (15), (16) and (17) to get equation (21):

[0169] (twenty one)

[0170] For driven tension T FA , we can combine the above formula (13), formula (14) and equation group (15) to get formula (22):

[0171] (twenty two)

[0172] Based on the combination and simplification of formula (20), formula (21) and formula (22), the simplified calculation formula (23) of the impact load P is obtained:

[0173] (twenty three)

[0174] Where P is the impact load, m is the mass of the impact load test piece, g is the gravitational acceleration, K is the inertia ratio of the common wheel, which is used to indicate the ratio of the inertia of the common wheel to the inertia of the guide wheel, wherein the common wheel may include the sum of the tensioning pulley group, the driving pulley, the first direction adjusting pulley and the second direction adjusting pulley; m is the inertia ratio of the impact load test piece, which is used to express the ratio of the inertia of the impact load test piece to the inertia of the wire pulley; is the difference between the first tension sensor and the second tension sensor, which has the effect of offsetting the influence of the preload force, M is the driving torque of the driving motor, is the radius of the ordinary wheel, is the interference force constant of the common wheel, which is used to indicate the effect of the torque on the common wheel; is the wire pulley interference force constant, which is used to indicate the effect of the torque acting on the wire pulley.

[0175] Among them, the inertia ratio of the ordinary wheel can be determined according to the following formula (24): ; Determine the inertia ratio of the wire wheel according to the following formula (25): ; Determine the interference force constant of the ordinary wheel according to the following formula (26): ; Determine the interference force constant of the wire wheel according to the following formula (27): :

[0176] (twenty four)

[0177] (25)

[0178] (26)

[0179] (27)

[0180] In this embodiment, the radius of each fixed pulley is set to be equal.

[0181] In some other embodiments, the above structured water entry test device can also be used to measure the impact load of the impact load test piece when it is in a free fall state. For example, according to the above force analysis, it is known that it is only necessary to ensure that the driving tension T EF and driven tension T FA If the impact load is equal, it can be considered that the test piece is in free fall motion.

[0182] Correspondingly, the driving torque M of the driving motor can be obtained according to the above formulas (20), (21) and (22) to realize the free fall motion of the impact load test piece:

[0183] (28)

[0184] By analyzing the above formula (28), when the impact load test piece is required to perform free fall motion, the horizontal tension and vertical tension can be monitored in real time to calculate the driving torque M in real time, and then the driving motor can be controlled to output according to the calculated driving torque M, so as to ensure that the impact load test piece is in free fall motion, thereby realizing the impact load measurement of the impact load test piece in the free fall motion state.

[0185] Reference Figure 6 An embodiment of the present application further provides a structure entry water test method, which is applied to the above structure entry water test device. The method may include S601-S604:

[0186] S601, the controller controls the drive component to start;

[0187] S602, the driving assembly drives the traction member to move on the tensioning pulley block, the direction adjustment pulley block and the tension detection assembly, so that the traction member drives the impact load test piece to perform a water entry test;

[0188] S603, when the impact load test piece is subjected to a water entry test, the controller obtains the driving torque of the driving assembly, the horizontal tension of the traction member in the horizontal direction, and the vertical tension in the vertical direction;

[0189] S604, the controller determines the impact load of the impact load test piece according to the horizontal tension, the vertical tension and the driving torque.

[0190] When conducting a structural water entry experiment, the driving torque of the driving component is adjusted to control the water entry speed of the impact load test piece driven by the traction member, so as to achieve uniform acceleration and uniform deceleration control. Then, before the impact load test piece is impacted by entering the water, the tensioning pulley group and the direction adjustment pulley group are adjusted according to the experimental requirements to ensure that the traction member is in a tensioned state and remains horizontal and vertical during the impact load measurement experiment. Then, the horizontal tension and vertical tension of the traction member are detected by the tension detection component, and the impact load of the impact load test piece when entering the water is obtained through the horizontal tension, vertical tension and driving torque. The structural water entry experimental device can freely set the water entry speed. At the same time, the water entry posture of the impact test piece can be guaranteed by adjusting the tensioning pulley group and the direction adjustment pulley group, which reduces the difficulty of theoretical analysis. In addition, the real-time acquisition of horizontal tension, vertical tension and driving torque can obtain real-time impact load, which provides strong help for analyzing the structural water entry problem.

[0191] In some embodiments, S604 may specifically include:

[0192]

[0193] Where P is the impact load, m is the mass of the impact load test piece, g is the gravitational acceleration, K is the inertia ratio of the common wheel, which is used to indicate the ratio of the inertia of the common wheel to the inertia of the guide wheel, wherein the common wheel may include the sum of the tensioning pulley group, the driving pulley, the first direction adjusting pulley and the second direction adjusting pulley; m is the inertia ratio of the impact load test piece, which is used to express the ratio of the inertia of the impact load test piece to the inertia of the wire pulley; is the difference between the first tension sensor and the second tension sensor, which has the effect of offsetting the influence of the preload force, M is the driving torque of the driving motor, is the radius of the ordinary wheel, is the interference force constant of the common wheel, which is used to indicate the effect of the torque on the common wheel; is the wire pulley interference force constant, which is used to indicate the effect of the torque acting on the wire pulley.

[0194] In some embodiments, in order to realize the structural water entry test under all working conditions, it is also necessary to consider the structural water entry test under the free fall state. Therefore, when the traction member drives the impact load test piece into the free fall state to complete the water entry test under free fall, the method further includes:

[0195] The controller determines the free fall driving torque of the driving assembly according to the horizontal tension and the vertical tension;

[0196] The controller controls the driving assembly in real time according to the free-fall driving torque to ensure that the impact load test piece maintains a free-fall state.

[0197] In this embodiment, through the above force analysis, it can be known that in the process of the impact load test piece undergoing the structural water entry test, if you want to ensure that the impact load test piece is in a free fall state, you need to ensure that the driving tension T EF and driven tension T FA Keep them equal, so it is necessary to control the driving torque output by the driving motor in real time to achieve the free fall motion of the impact load test piece.

[0198] In some embodiments, the controller determines the free fall driving torque of the driving assembly according to the horizontal tension and the vertical tension, including:

[0199]

[0200] in, is the mass of the wire wheel, g is the acceleration due to gravity, is the inertia ratio of the common wheel, which is used to represent the ratio of the inertia of the common wheel to the inertia of the wire wheel, wherein the common wheel may include the sum of the tensioning pulley group, the driving pulley, the first direction adjusting pulley and the second direction adjusting pulley; is the difference between horizontal tension and vertical tension, which has the effect of offsetting the influence of preload. M is the free fall driving torque of the drive assembly. is the radius of the ordinary wheel, is the interference force constant of the common wheel, which is used to indicate the effect of the torque on the common wheel; is the wire pulley interference force constant, which is used to indicate the effect of the torque acting on the wire pulley.

[0201] The above are only specific implementation methods of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A structure submersion test device, characterized in that: include: A support frame (1), wherein a storage container (11) is arranged inside the support frame (1); A drive assembly (2), the drive assembly (2) being arranged on the support frame (1); A tensioning pulley block (3), a traction member (4) being wound around the tensioning pulley block (3), one end of the traction member (4) being connected to the driving assembly (2), and the traction member (4) being used to pull the impact load test piece; A direction-adjusting pulley block (5), wherein the direction-adjusting pulley block (5) is arranged at the bottom of the storage container (11); A tension detection component (6), wherein the tension detection component (6) is arranged on the support frame (1), and the traction member (4) sequentially passes through the drive component (2), the tension pulley group (3), the direction adjustment pulley group (5), and the tension detection component (6); A controller (7), the controller (7) being electrically connected to the driving component (2) and the tension detection component (6) respectively; The driving assembly (2) is used to drive the traction member (4) to move, so that the traction member (4) drives the impact load test piece to perform an impact load measurement experiment; The tension detection component (6) is used to detect the horizontal tension of the traction member (4) in the horizontal direction and the vertical tension in the vertical direction, and transmit the detected horizontal tension and vertical tension to the controller (7); The controller (7) is used to control the start-up of the driving component (2) and obtain the driving torque of the driving component (2), so that the driving component (2) drives the traction component (4) to move, thereby completing the impact load measurement experiment of the impact load test piece; The controller (7) is also used to receive the horizontal tension and the vertical tension detected by the tension detection component (6), and determine the impact load of the impact load test piece according to the horizontal tension, the vertical tension and the driving torque.

2. The structure-immersion experimental device according to claim 1, characterized in that: The support frame (1) is provided with a placement bracket (12); The driving component (2) comprises: A drive motor (21) is arranged on the placement bracket (12), the traction member (4) sequentially passes around the output shaft of the drive motor (21) and the tension pulley block (3), and the drive motor (21) is electrically connected to the controller (7).

3. The structure-immersion experimental device according to claim 2, characterized in that: The driving component (2) further comprises: A torque sensor (22), the torque sensor (22) being electrically connected to the controller (7), and the torque sensor (22) being used to detect the driving torque output by the driving motor (21).

4. The structure-immersion experimental device according to claim 2, characterized in that: The driving component (2) comprises: A mounting block (24), the mounting block (24) being fixedly connected to the drive motor (21), first mounting plates (25) being vertically arranged on both sides of the mounting block (24), and second mounting plates (26) being slidably connected to the two first mounting plates (25); The tensioning pulley assembly (3) comprises: A first tensioning pulley (31), the first tensioning pulley (31) being arranged on a first mounting plate (25) at one side; a second tensioning pulley (32), the second tensioning pulley (32) being arranged on the second mounting plate (26); a third tensioning pulley (33), the third tensioning pulley (33) being arranged on the same side as the first tensioning pulley (31) and being arranged on the same first mounting plate (25); The traction member (4) passes around the first tensioning pulley (31), the second tensioning pulley (32), and the third tensioning pulley (33) in sequence.

5. The structure-immersion experimental device according to claim 4, characterized in that: The second mounting plate (26) is provided with a sliding hole (261), and the second tensioning pulley (32) passes through the sliding hole (261) and is slidably connected to the second mounting plate (26).

6. The structure-immersion experimental device according to claim 4, characterized in that: The direction-adjusting pulley block (5) comprises: a first direction adjustment pulley (51), the first direction adjustment pulley (51) being arranged at the bottom of the storage container (11), the first direction adjustment pulley (51), the first tensioning pulley (31) and the third tensioning pulley (33) being on the same vertical line; a second direction adjusting pulley (52), wherein the second direction adjusting pulley (52) is arranged at the bottom of the storage container (11); The traction member (4) sequentially passes around the first direction adjustment pulley (51) and the second direction adjustment pulley (52).

7. The structure-immersion experimental device according to claim 6, characterized in that: The first direction adjusting pulley (51) and the second direction adjusting pulley (52) are located on the same horizontal plane.

8. The structure-immersion experimental device according to claim 6, characterized in that: A third mounting plate (13) is arranged on the support frame (1); The tension detection component (6) comprises: A guide wheel (61), the guide wheel (61) being arranged on the third mounting plate (13); The traction member (4) sequentially passes around the guide wheel (61), the tension pulley group (3) and the driving assembly (2); A tension sensor (62), the tension sensor (62) being arranged on the third mounting plate (13); the tension sensor (62) being electrically connected to the controller (7), and the tension sensor (62) being capable of detecting the horizontal tension and the vertical tension of the traction member (4).

9. The structure-immersion experimental device according to claim 8, characterized in that: The tension sensor (62) comprises a first tension sensor (621) and a second tension sensor (622); A detection plate (63) is arranged on the wire wheel (61), and the first tension sensor (621) and the second tension sensor (622) are both arranged on the detection plate (63), and the first tension sensor (621) is capable of detecting the horizontal tension of the traction member (4), and the second tension sensor (622) is capable of detecting the vertical tension of the traction member (4).

10. The structure-immersion experimental device according to claim 9, characterized in that: The first tension sensor (621) and the second tension sensor (622) are both movably connected to the third mounting plate (13).

11. The structure-immersion experimental device according to claim 8, characterized in that: The tension sensor (62) comprises a six-axis sensor (623), the six-axis sensor (623) being arranged coaxially with the axis of the guide wheel (61), and the six-axis sensor (623) being capable of detecting the horizontal tension and the vertical tension of the traction member (4).

12. A method for testing a structure entering water, characterized in that: Applied to the structure entry water experimental device according to any one of claims 1 to 11, the method comprises: The controller (7) controls the driving component (2) to start; The driving assembly (2) drives the traction member (4) to move on the tensioning pulley block (3), the direction adjustment pulley block (5) and the tension detection assembly (6), so that the traction member (4) drives the impact load test piece to perform a water entry test; When the impact load test piece is subjected to a water entry test, the controller (7) obtains the driving torque of the driving component (2), the horizontal tension of the traction member (4) in the horizontal direction, and the vertical tension in the vertical direction; The controller (7) determines the impact load of the impact load test piece according to the horizontal tension, the vertical tension and the driving torque.

13. The method according to claim 12, characterized in that The controller (7) determines the impact load of the impact load test piece according to the horizontal tension, the vertical tension and the driving torque, including: ； Where P is the impact load, m is the mass of the impact load test piece, g is the gravitational acceleration, is the inertia ratio of the common wheel, used to express the ratio of the inertia of the common wheel to the inertia of the wire wheel, m c K is the mass of the wire pulley, where the common pulley includes the sum of the tension pulley group, the driving pulley, the first direction adjustment pulley and the second direction adjustment pulley; m is the inertia ratio of the impact load test piece, which is used to express the ratio of the inertia of the impact load test piece to the inertia of the wire pulley; is the difference between horizontal tension and vertical tension, which has the effect of offsetting the influence of preload. M is the driving torque of the driving component. is the radius of the ordinary wheel, is the interference force constant of the common wheel, which is used to indicate the effect of the torque on the common wheel; is the wire pulley interference force constant, which is used to indicate the effect of the torque acting on the wire pulley.

14. The method according to claim 12, characterized in that When the traction member (4) drives the impact load test piece to enter a free fall state to complete the water entry test under free fall, the method further comprises: The controller (7) determines the free fall driving torque of the driving component according to the horizontal tension and the vertical tension; The controller (7) controls the driving component in real time according to the free-fall driving torque to ensure that the impact load test piece remains in a free-fall state.

15. The method according to claim 14, characterized in that The controller determines the free fall driving torque of the driving assembly according to the horizontal tension and the vertical tension, including: ； in, is the mass of the wire wheel, g is the acceleration due to gravity, is the inertia ratio of the common wheel, which is used to indicate the ratio of the inertia of the common wheel to the inertia of the guide wheel, wherein the common wheel includes the sum of the tensioning pulley group, the driving pulley, the first direction adjusting pulley and the second direction adjusting pulley; is the difference between horizontal tension and vertical tension, which has the effect of offsetting the influence of preload. M is the free fall driving torque of the drive assembly. is the radius of the ordinary wheel, is the interference force constant of the common wheel, which is used to indicate the effect of the torque on the common wheel; is the wire pulley interference force constant, which is used to indicate the effect of the torque acting on the wire pulley.

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