Crank stroke type wave generation simulation mechanism in supergravity environment and implementation method

Abstract

The invention relates to a crank stroke type wave generation simulation mechanism in a supergravity environment and an implementation method, and relates to the field of supergravity field wave generation. The simulation mechanism comprises a wave making mechanism supporting seat, a driving module, a wave making device and a connecting module; the driving module is arranged above the wave making mechanism supporting seat, the wave making device is arranged below the wave making mechanism supporting seat, the upper end and the lower end of the connecting module are directly connected with the driving module and the wave making device respectively, and circular motion is converted into linear motion. The implementation method comprises the following steps: determining a test model rate, a model water depth, a wave making plate draught depth, a stroke and an actuation frequency according to a simulated target wave height; placing a model, arranging a wave making simulation mechanism and a monitoring instrument, and injecting water; starting a centrifugal machine and a hydraulic motor; and observing, recording and checking the wave form. The structure feasibility is higher, driving control is easy, high-frequency and large-stroke circulating reciprocating motion can be achieved in the supergravity environment, and the maximum wave height is increased to 10 m.

Description

Technical Field

[0001] The invention belongs to the field of hypergravity field wave generation, and in particular relates to a crank stroke wave generation simulation mechanism and an implementation method under a hypergravity environment. Background Art

[0002] At present, domestic scholars have developed a variety of wave simulation methods under hypergravity environments. The stroke-type wave-making device generates surface waves by reciprocatingly hitting the water surface. Since it only interferes with the near-surface water, the wave-making efficiency is relatively higher. It can also effectively save space in the direction of wave propagation, which has advantages in hypergravity environments.

[0003] On the one hand, when existing stroke-type wave-making structures generate waves, they mainly rely on pneumatic or hydraulic control devices to directly drive the wave-making plates, and the movement direction needs to be frequently switched during wave generation.

[0004] For example, Chinese patent CN109186937A (publication date: January 11, 2019) discloses a hydraulically driven push-plate wave-making test device under hypergravity conditions, which uses two sets of hydraulic drive systems outside the model box to provide hydraulic power to the wave-making hydraulic cylinder and the wave-breaking hydraulic cylinder respectively through the centrifuge rotary joint to achieve push-plate wave-making. For the hydraulically controlled device, due to the influence of the hypergravity environment during the wave-making process, a large impact force is generated on the wave-making plate itself and the control device. The characteristic is that the higher the actuation frequency, the greater the impact force. When the mechanical structure components are directly stuck or even damaged due to high-speed impact, the entire wave-making mechanism will be directly stuck or even damaged, affecting the test efficiency;

[0005] In addition, Chinese patent CN110579333A (publication date: December 17, 2019) discloses a hypergravity field ship wave simulation test device and method, which uses a pneumatic actuator to use pneumatic output to do work, driving the wedge block to move in a direction perpendicular to the hypergravity model test box to create waves. For the pneumatic control device, according to the formula of force, pressure and area (F=P×S), when the pressure P is constant, the area S can only be increased to obtain a greater force, but the gas pressure in the hypergravity environment is limited and cannot provide a higher pressure. If the area is increased, it will lead to an increase in the weight of the components, resulting in an excessive burden on the wave-making system and the centrifuge, which is not conducive to the safety of the overall test system.

[0006] Furthermore, Chinese patent CN104060572A (publication date: September 24, 2014) uses a motor to make waves, and discloses a rocking plate type wave machine system in a supergravity field, wherein a force conversion device converts the rotational motion of the motor output into the linear reciprocating motion of a connecting rod, and the connecting rod is connected to the rocking plate, so that the rocking plate can swing back and forth to generate waves in the water of the model box. Although the system uses a motor and converts the rotational motion of the motor into linear reciprocating motion, it still needs linear reciprocating motion to drive the rocking plate to swing to generate waves, and the structure is relatively complex, the utilization rate of the motor output power is not high, and when a rocking plate of a certain length is running at high speed in water, it is easy to get stuck or damaged due to insufficient rigidity.

[0007] On the other hand, with global climate change, large-scale nearshore waves are becoming more frequent, and the service toughness requirements of port structures under high wave action are further increased, and the requirements for larger-scale wave simulation are further increased. However, the simulated wave height created by the stroke wave-making device in the current hypergravity environment is usually only below 5m, which can no longer meet the requirements of large waves. Existing studies have shown that simply increasing the model rate N cannot increase the simulated wave height (increasing the gravitational acceleration will cause the wave-making transfer function to decay rapidly). Therefore, while ensuring high stroke and high actuation frequency, improving test efficiency and safety is of great significance to the technological progress of related industries. Summary of the invention

[0008] In order to solve the above problems and improve the level of existing technology, the present invention provides a crank-stroke wave-making simulation mechanism and an implementation method in a hypergravity environment. The system adopts a crank-stroke wave-making simulation mechanism, which can reflect all characteristics of waves in a hypergravity environment, including controlling the frequency, wavelength and wave height of waves, and increasing the frequency of the stroke wave-making device to 10Hz, with a maximum stroke of not less than 160mm, and the prototype wave generated is as high as 10m level.

[0009] A crank stroke wave-making simulation mechanism in a hypergravity environment, comprising a wave-making mechanism support seat, a driving module, a wave-making device, and a connecting module;

[0010] The wave-making mechanism support seat includes a support seat back plate, a support seat side plate and a support seat bottom plate, wherein the support seat back plate is vertically arranged with the support seat bottom plate; a rectangular hollow groove is reserved on the support seat bottom plate near the support seat back plate; the support seat side plate is a right-angled triangle structure, and two right-angled sides are vertically connected to the support seat back plate and the support seat bottom plate, respectively, and are arranged on both sides of the support seat bottom plate;

[0011] The driving module is arranged above the bottom plate of the support seat, and the wave-making device is arranged below the support seat of the wave-making mechanism, close to the back plate of the support seat;

[0012] The connecting module passes through the hollow groove of the support seat back plate and is fixed above the support seat back plate behind the driving module. The upper and lower ends are directly connected to the driving module and the wave-making device respectively, converting the circular motion of the driving module into the linear motion of the wave-making device.

[0013] Further, the wave-making device is a stroke-type wave-making device, including a wave-making plate back plate, a vertical track, a wave-making plate, and a sliding block;

[0014] The wave-making plate back plate passes through the hollow groove of the support seat back plate and is fixed on the support seat back plate;

[0015] The vertical rails are vertically fixed on both sides of the back plate of the wave-making plate;

[0016] The wave-making plate is in the form of a straight triangular prism and is located below the bottom plate of the support seat. The longer right-angled side of the wave-making plate is slidably connected to the vertical track through a sliding block and moves vertically on the vertical track.

[0017] Further, the driving module includes a hydraulic motor and a motor support;

[0018] The hydraulic motor is movably connected to the support seat bottom plate through the motor support; the motor support is a movable screw rod structure.

[0019] Further, the connection module includes a crank, a crank positioning bearing, a crank counterweight, a connecting rod, and a connecting rod hinge support;

[0020] The crank is a curved metal component, and the crank structure is divided into three sections, including an upper driving section, a middle curved eccentric section, and a lower supporting section; a spline structure is arranged inside the shaft end of the upper driving section to be connected to the hydraulic motor, and is fixed by the crank positioning bearing; one end of the middle curved eccentric section is two parallel crank counterweights, and the other end is narrowed and connected to the eccentric shaft; the lower supporting section is fixed to the back plate of the wave-making plate by the crank positioning bearing;

[0021] The upper part of the connecting rod is provided with a circular hole, which is connected to the eccentric shaft bearing of the middle curved eccentric section of the crank and is reinforced and fixed by bolts; the lower part of the connecting rod is hingedly connected to the connecting rod hinge support;

[0022] The connecting rod hinge support is fixedly connected to the wave-making plate through bolts.

[0023] Furthermore, the eccentric distance of the eccentric shaft of the middle curved eccentric section is 1 / 2 of the movement distance of the wave-making plate; and the internal spline structure of the shaft end of the upper driving section is a standardized product.

[0024] Furthermore, the maximum stroke of the wave-making plate in the wave-making device is 160 mm, the maximum frequency is 10 Hz, and it can simulate prototype waves with a wave height of 10 m.

[0025] Furthermore, the hydraulic motor of the driving module is a radial piston motor with a maximum working pressure of not less than 25MPa, a torque of not less than 500Nm, and a maximum speed of not less than 600rpm; the hydraulic station equipped with the geotechnical centrifuge supplies oil to the hydraulic motor with a maximum flow rate of not less than 100L / min and an oil pressure of not less than 16MPa.

[0026] A method for implementing a crank-stroke wave-making simulation mechanism in a hypergravity environment, using the crank-stroke wave-making simulation mechanism in a hypergravity environment, comprises the following steps:

[0027] S1. Determine the test model rate, model water depth, draft depth, stroke, and actuation frequency of the wave-making plate according to the simulated target wave height;

[0028] S2. Place the model. If it is a seabed or nearshore shoal model, select the corresponding soil. If it is a structure model, select appropriate materials according to the scale to make the model.

[0029] S3. After the model is installed, the wave-making simulation mechanism is placed against the wall of the model box, and corresponding monitoring instruments are arranged; the water depth is determined according to the similarity ratio, and water or liquid with a certain similarity relationship is injected into the model box to reach the required water level depth;

[0030] S4, setting the output frequency of the hydraulic motor according to step S1, and adjusting the connecting rod stroke of the crank;

[0031] S5, start the centrifuge, and start the hydraulic motor after the centrifuge speed stabilizes;

[0032] S6. Observe and record: record the wave shape through the visual window and calibrate the wave shape according to the sensors of the monitoring instrument.

[0033] Compared with the prior art, the advantages and effects of the technical solution of this application are as follows:

[0034] 1. The present application provides a crank stroke wave-making simulation mechanism in a hypergravity environment. It does not need to use pneumatic or hydraulic devices to drive the wave-making plate. The high-speed rotation of the hydraulic motor drives the crank to make a rocker movement, which directly drives the wave-making plate to move up and down along the slider. This structure eliminates the linear motion of the drive device, and then eliminates the friction contact between the drive module and the wave-making plate, which is beneficial to the service life of various components; the combination of various moving parts is mainly connected by bearings, and the stiffness has little influence on each other. It is not easy to get stuck due to insufficient stiffness during high-speed operation, and the structure is more feasible; the drive control is simple, and there is no need to set a module for switching the movement direction. A higher wave-making frequency can be obtained by simply increasing the motor speed;

[0035] 2. The present application provides a crank stroke wave-making simulation mechanism for a hypergravity environment, including a drive module, which uses a hydraulic motor to drive the crank to rotate. Under the condition of the same output torque or power, the weight is much smaller than other rotating mechanisms, the structure is streamlined, and the energy consumption is low.

[0036] 3. The crank stroke wave-making simulation mechanism provided by the present application in a hypergravity environment has a stable structure and can withstand high-frequency and large-stroke movements. The servo control system can accurately control the rotation speed of the hydraulic motor, thereby realizing the wave-making simulation requirements of different frequencies. By replacing the cranks with different eccentricities, the requirements of different wave-making strokes can be met. By adjusting the length of the connecting rod to reduce the stroke of the wave-making plate, it can adapt to the extreme wave height of complex condition strokes, and can also simulate waves in low water depth and general near-shore conditions.

[0037] 4. The present application provides an implementation method of a crank stroke wave-making simulation mechanism in a hypergravity environment. According to theoretical calculations, static indicators such as water depth and draft depth are adjusted to achieve high-frequency, large-stroke cyclic reciprocating motion in a hypergravity environment, thereby increasing the maximum wave height of the crank stroke wave maker in a hypergravity field to 10m.

[0038] The above is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0039] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0041] Figure 1 It is a schematic diagram of wave-making of a crank-stroke wave-making simulation mechanism in a hypergravity environment according to one embodiment of the present invention;

[0042] Figure 2It is a schematic diagram of the working principle of a crank stroke wave-making simulation mechanism in a hypergravity environment according to one embodiment of the present invention;

[0043] Figure 3 It is an overall schematic diagram of a crank stroke wave-making simulation mechanism in a hypergravity environment according to one embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of the internal structure of a crank stroke wave-making simulation mechanism in a hypergravity environment according to one embodiment of the present invention;

[0045] Figure 5 It is a schematic diagram of a crank of a crank stroke wave-making simulation mechanism in a hypergravity environment according to one embodiment of the present invention;

[0046] Figure 6 It is a schematic diagram of the overall wave-making structure of a crank-stroke wave-making simulation mechanism in a hypergravity environment according to one embodiment of the present invention;

[0047] Figure numerals: 1. wave-making mechanism support seat; 2. drive module; 3. wave-making device; 4. connection module; 5. wave-making plate back plate; 6. vertical track; 7. wave-making plate; 8. sliding block; 9. hydraulic motor; 10. motor support; 11. crank; 12. crank positioning bearing; 13. crank counterweight; 14. connecting rod; 15. connecting rod hinge support; 16. upper driving section, 17. middle curved eccentric section; 18. lower supporting section. DETAILED DESCRIPTION

[0048] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all the embodiments. In the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment. It should be understood that "one embodiment" or "this embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "one embodiment" or "this embodiment" appearing in various places throughout the specification may not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0049] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0050] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association relationship between associated objects, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] It should also 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", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0052] Example 1

[0053] like Figure 1 The figure shows a schematic diagram of a crank stroke wave-making simulation mechanism in a hypergravity environment. The wave-making device is driven to reciprocate up and down to generate waves. The wave-making device completes a wave-making process from the balance point to the lowest point to the highest point. The transfer function formed is expressed as:

[0054]

[0055] Where: A is the amplitude, i.e. the maximum wave height, S is the stroke of the wave-making device, d is the water depth of the tank, f1 is the initial immersion depth, f2 is the draft depth, and k = 2π / L is the wave number. On the other hand, according to the dispersion relation:

[0056]

[0057] Where: F is the wave frequency (theoretically the same as the wave-making device frequency), N is the model rate, and g is the gravitational acceleration. Given the actuator frequency, model rate, and water depth, in practice, it is necessary to iteratively find the value of kd to determine the wave elements and consider the influence of the hypergravity field. It can be seen that the maximum wave height H created by the device in the hypergravity field is only related to the model rate, actuation frequency, stroke, water depth, and draft of the wave-making plate (studies have shown that the impact angle has limited effect on the wave height). According to the above relationship, if the model rate N is 50 and the water depth is 0.5m, for simulating waves with a prototype wave height of more than 5m, an actuation frequency of at least 9Hz is required, and the wave-making plate needs a stroke of more than 150mm. On the premise that the stroke and actuation frequency are guaranteed, the draft and water depth can be adjusted to obtain the target wave height to be simulated.

[0058] like Figure 2 The figure shows a schematic diagram of the working principle of a crank stroke wave-making simulation mechanism in a hypergravity environment. The invention relates to a connecting module, wherein the crank is driven by a driving module and drives a connecting rod to convert circular motion into linear motion. The other end of the connecting rod is connected to the wave-making device through a bearing, and the wave-making device can only move along a linear track. The working principle is as follows: let the crank radius be r, the connecting rod length be l, the angular frequency of the crank rotation w=2πF, the connecting rod stroke be x, α is the crank motion angle, and the connecting rod ratio λ=r / l.

[0059] According to the geometric relationship, the connecting rod travel displacement is:

[0060]

[0061] At this time, the stroke (stroke) S of the wave-making plate is the same as the connecting rod stroke. When the crank rotates one circle, the wave-making plate completes a stroke (initial point - lowest point - back to the initial point). It can be seen from the above formula that when the connecting rod ratio is constant, the stroke S is only determined by the crank radius. The connecting rod movement frequency is directly related to the angular frequency w, that is, it is directly related to the drive frequency F, so increasing the drive frequency can directly increase the wave-making frequency. If this wave-making mechanism is used in a 50g supergravity environment, if the mass of the wave-making plate is 9.4kg, then according to the torque calculation (M=N×g×l), it can be seen that a power source with a theoretical torque M≤380Nm and a rotation speed ≤600rpm is required.

[0062] As a preference, the invention recommends a hydraulic motor with a torque of 528 Nm, a maximum speed of 600 rpm, and a working pressure of 25 MPa. Under the condition of 50 g gravity acceleration, the hydraulic motor frequency is up to 10 Hz; when f = 10 Hz, the time taken for each rotation is 2.78 × 10-4 s, when f = 5 Hz, the time taken for each rotation is 5.56 × 10-4 s, and when f = 1 Hz, the time taken for each rotation is 27.78 × 10-4 s.

[0063] Technical effect of this embodiment: This application adopts a hydraulic motor to rotate at high speed to drive the crank to move, and the crank drives the connecting rod to do rocker arm movement, thereby driving the wave-making plate to move up and down along the slider, and the wave-making plate moves up and down to squeeze the water body and generate waves.

[0064] It is driven by a hydraulic motor and has the advantages of small size, light weight and high torque. While reducing the total weight of the equipment, it only needs oil supply from the hydraulic station to work, which has obvious advantages in a hypergravity environment.

[0065] Example 2

[0066] like Figure 3 The figure shows the overall schematic diagram of a crank stroke wave-making simulation mechanism in a hypergravity environment. Figure 3 a is the overall side view of the mechanism. Figure 3 b is the overall front view of the mechanism. The crank stroke wave-making simulation mechanism adopts the basic principle of the first embodiment.

[0067] A crank stroke wave-making simulation mechanism in a hypergravity environment, comprising a wave-making mechanism support seat 1, a driving module 2, a wave-making device 3, and a connecting module 4;

[0068] The wave-making mechanism support seat 1 includes a support seat back plate, a support seat side plate and a support seat bottom plate, wherein the support seat back plate is vertically arranged with the support seat bottom plate; a rectangular hollow groove is reserved on the support seat bottom plate near the support seat back plate; the support seat side plate is a right-angled triangle structure, and two right-angled sides are vertically connected to the support seat back plate and the support seat bottom plate, respectively, and are arranged on both sides of the support seat bottom plate;

[0069] The driving module 2 is arranged above the bottom plate of the support seat, and the wave-making device 3 is arranged below the wave-making mechanism support seat 1, close to the back plate of the support seat;

[0070] The connecting module 4 passes through the hollow groove of the support seat back plate and is fixed above the support seat back plate behind the driving module 2. The upper and lower ends are directly connected to the driving module 2 and the wave-making device 3 respectively, converting the circular motion of the driving module 2 into the linear motion of the wave-making device 3.

[0071] Further, the wave-making device 3 is a stroke-type wave-making device, including a wave-making plate back plate 5, a vertical track 6, a wave-making plate 7, and a sliding block 8;

[0072] The wave-making plate back plate 5 passes through the hollow groove of the support seat back plate and is fixed on the support seat back plate;

[0073] The vertical rails 6 are vertically fixed on both sides of the wave-making plate back plate 5;

[0074] The wave-making plate 7 is in the form of a straight triangular prism and is located below the bottom plate of the support seat. The longer right-angled side of the wave-making plate 7 is slidably connected to the vertical track 6 through a sliding block 8 and moves vertically on the vertical track 6 .

[0075] The wave-making plate is connected to the vertical track via a sliding block 6, which ensures that the wave-making plate can only move vertically in the box body and can resist a certain amount of water pressure eccentric load;

[0076] like Figure 4 The figure shows the internal structure of a crank stroke wave-making simulation mechanism in a hypergravity environment. Figure 4 a is the side view of the internal structure, Figure 4 b is the rear view of the internal structure.

[0077] Furthermore, the driving module 2 includes a hydraulic motor 9 and a motor support 10;

[0078] The hydraulic motor 9 is movably connected to the support base bottom plate through the motor support 10; the motor support 10 is a movable screw rod structure.

[0079] The hydraulic motor 5 is subjected to huge centrifugal force in a hypergravity environment. Such a cantilever structure is prone to significant deformation in a hypergravity environment. The motor support 3 can effectively support the hydraulic motor 5, thereby ensuring the normal operation of the hydraulic motor 5 in a hypergravity environment.

[0080] Further, the connection module 4 includes a crank 11, a crank positioning bearing 12, a crank counterweight 13, a connecting rod 14, and a connecting rod hinge support 15;

[0081] like Figure 5 The figure shows a crank schematic diagram of a crank stroke wave-making simulation mechanism in a hypergravity environment. Figure 5 a is the side view of the crank, Figure 5 b is a side view of the crank. The crank 11 is a curved metal component, and the crank 11 is divided into three sections, including an upper driving section 16, a middle curved eccentric section 17, and a lower supporting section 18; a spline structure is provided inside the shaft end of the upper driving section 16 to connect with the hydraulic motor 9, and is fixed by the crank positioning bearing 12;

[0082] One end of the middle curved eccentric section 17 is two parallel crank counterweights 13, and the other end is narrowed and connected to the eccentric shaft;

[0083] The crank 11 is an eccentric structure, which will bring unbalanced centrifugal force when rotating at high speed. In order to reduce centrifugal vibration, a crank counterweight 8 is installed at the other end of the crank;

[0084] The lower support section 18 is fixed to the wave-making plate back plate 5 through the crank positioning bearing 12; the two ends of the crank are fixed through the crank positioning bearings, which can withstand the buoyancy generated by the waves and the gravity of the structure, and the crank positioning bearing 11 bears the pulling force of the entire crank stroke wave-making simulation mechanism;

[0085] The structural shaft at the upper end of the crank 11 is used to transmit the torque of the hydraulic motor 5 , the middle crank eccentric section is used to connect the connecting rod component to change the movement distance of the wave-making plate 2 , and the lower section support is used to support the crank 11 .

[0086] The lower structure of the crank locating bearing 12 is a flat cylinder with a larger radius, and the upper structure is a flat cylinder with a smaller radius. The centers of the two circles are in a straight line, and a hollow circular hole is reserved at the center according to the shape of the crank. A plurality of bolt connection holes are evenly distributed on the lower structure, and a bolt tightening device is provided on the curved surface of the upper structure for reinforcing the connection with the crank 11; the upper structure of the crank locating bearing 12 is all bent toward the middle eccentric section 17.

[0087] The connecting rod 14 has a circular hole at the top, which is connected to the eccentric shaft bearing of the middle curved eccentric section 17 of the crank 11 and is fixed by bolts; the connecting rod 14 is hingedly connected to the connecting rod hinge support 15 at the bottom;

[0088] The connecting rod hinge support 15 is fixedly connected to the wave-making plate 7 by bolts.

[0089] A support frame is also provided on the outside of the connection module, and the upper frame can be opened for maintenance and repair.

[0090] Furthermore, the eccentric distance of the eccentric shaft of the intermediate curved eccentric section 17 is 1 / 2 of the movement distance of the wave-making plate;

[0091] Preferably, the internal spline structure of the shaft end of the upper driving section 16 is a standardized product.

[0092] Furthermore, the maximum stroke of the wave-making plate in the wave-making device is 160 mm, the maximum frequency is 10 Hz, and it can simulate prototype waves with a wave height of 10 m.

[0093] Furthermore, the hydraulic motor of the driving module is a radial piston motor, with a maximum working pressure of not less than 25MPa, a torque of not less than 500Nm, and a maximum speed of not less than 600rpm. The hydraulic station equipped with the geotechnical centrifuge supplies oil to the hydraulic motor, with a maximum flow rate of not less than 100L / min and an oil pressure of not less than 16MPa.

[0094] Preferably, the wave-making simulation mechanism described in this embodiment is placed close to the wall of the model box when installed, and a transparent organic glass window is provided on the side wall of the model box on which the present invention is installed;

[0095] Preferably, the wave-making plate is made of carbon structural steel, and the crank connecting rod is made of alloy structural steel;

[0096] Preferably, a wave-absorbing back plate is provided opposite to the wave-making plate in the model box to reduce the influence of the reflected wave on the test;

[0097] Preferably, during the test, the gravity acceleration can be set to any value below 100g and above 10g, and the generated wave height is converted into the prototype wave height according to the basic principle of Example 1.

[0098] Technical effect of this embodiment: This embodiment uses a hydraulic motor drive, which has the advantages of small size, light weight, and large torque. While reducing the total weight of the equipment, it only needs oil supply from the hydraulic station to work, and has obvious advantages in a hypergravity environment.

[0099] Example 3

[0100] This embodiment relates to the implementation method of the crank stroke wave-making simulation mechanism in the hypergravity environment in the embodiment 2, adopts the basic principle in the embodiment 1, and includes the following steps:

[0101] A method for implementing a crank stroke wave-making simulation mechanism in a hypergravity environment comprises the following steps:

[0102] S1. Determine the test model rate, model water depth, draft depth, stroke, and actuation frequency of the wave-making plate according to the simulated target wave height;

[0103] S2. Place the model. If it is a seabed or nearshore shoal model, select the corresponding soil. If it is a structure model, select appropriate materials according to the scale to make the model.

[0104] S3. After the model is installed, the wave-making simulation mechanism is placed against the wall of the model box, and corresponding monitoring instruments are arranged; the water depth is determined according to the similarity ratio, and water or a liquid with a certain similarity relationship (such as silicone oil) is injected into the model box to reach the required water level depth; the installation effect is as follows: Figure 6 shown.

[0105] The wave-making simulation mechanism is placed close to one side of the model box wall, and the wave-making back plate is in contact with the model box wall, thereby reducing the bending moment caused by the waves on the wave-making.

[0106] S4, setting the output frequency of the hydraulic motor according to step 1, and adjusting the crank connecting rod stroke;

[0107] S5. Start the centrifuge, and start the hydraulic motor after the centrifuge speed stabilizes; the crank rotates at high speed under the drive of the hydraulic motor, and the connecting rod rotates and swings around the center axis of the crank, thereby driving the wave-making plate to move up and down in the preset track on the wave-making back plate. The wave-making plate completes a stroke when the crank rotates one circle. The wave-making plate squeezes the liquid in the wave tank of the geotechnical centrifuge to generate simulated waves.

[0108] S6. Observe and record. Record the wave shape through the visual window and calibrate the wave shape according to the sensors of the monitoring instrument.

[0109] Technical effect of this embodiment: Taking into account that the space of the model box of the centrifugal model test is relatively small (usually the long side does not exceed 1m and the short side does not exceed 500mm), the stroke wave-making device can effectively save the horizontal space in the wave propagation direction. According to theoretical calculations, by adjusting static indicators such as water depth and draft depth, the maximum wave height of the stroke wave-making machine under the supergravity field can be increased to 10m.

[0110] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A crank stroke wave-making simulation mechanism in a hypergravity environment, characterized in that: It comprises a wave-making mechanism support seat (1), a driving module (2), a wave-making device (3), and a connecting module (4); The wave-making mechanism support seat (1) comprises a support seat back plate, a support seat side plate and a support seat bottom plate, wherein the support seat back plate is arranged vertically with respect to the support seat bottom plate; a rectangular hollow groove is reserved on the support seat bottom plate near the support seat back plate; the support seat side plate is a right-angled triangle structure, and two right-angled sides are respectively vertically connected to the support seat back plate and the support seat bottom plate, and are arranged on both sides of the support seat bottom plate; The driving module (2) is arranged above the bottom plate of the support seat, and the wave-making device (3) is arranged below the wave-making mechanism support seat (1) and close to the back plate of the support seat; The connection module (4) passes through the hollow groove of the support seat back plate and is fixed above the support seat back plate behind the driving module (2). The upper and lower ends are directly connected to the driving module (2) and the wave-making device (3) respectively, so as to convert the circular motion of the driving module (2) into the linear motion of the wave-making device (3).

2. The crank stroke wave-making simulation mechanism in a hypergravity environment according to claim 1, characterized in that: The wave-making device (3) is a stroke-type wave-making device, comprising a wave-making plate back plate (5), a vertical track (6), a wave-making plate (7), and a sliding block (8); The wave-making plate back plate (5) passes through the hollow groove of the support seat back plate and is fixed on the support seat back plate; The vertical rails (6) are vertically fixed on both sides of the wave-making plate back plate (5); The wave-making plate (7) is in the form of a straight triangular prism and is located below the bottom plate of the support seat. The longer right-angled side of the wave-making plate (7) is slidably connected to the vertical track (6) through a sliding block (8) and moves vertically on the vertical track (6).

3. The crank stroke wave-making simulation mechanism in a hypergravity environment according to claim 1, characterized in that: The driving module (2) comprises a hydraulic motor (9) and a motor support (10); The hydraulic motor (9) is movably connected to the support seat bottom plate via the motor support (10); the motor support (10) is a movable screw rod structure.

4. The crank stroke wave-making simulation mechanism in a hypergravity environment according to claim 1, characterized in that: The connection module (4) comprises a crank (11), a crank positioning bearing (12), a crank counterweight (13), a connecting rod (14), and a connecting rod hinge support (15); The crank (11) is a member made of metal and bent in shape. The crank (11) is divided into three sections, including an upper driving section (16), a middle curved eccentric section (17), and a lower supporting section (18). A spline structure is arranged inside the shaft end of the upper driving section (16) and is connected to the hydraulic motor (9) and fixed via the crank positioning bearing (12). One end of the middle curved eccentric section (17) is two parallel crank counterweights (13), and the other end is narrowed and connected to the eccentric shaft. The lower supporting section (18) is fixed to the connecting module (4) via the crank positioning bearing (12). The connecting rod (14) has a circular hole at its upper portion, which is connected to the eccentric shaft bearing of the middle curved eccentric section (17) of the crank (11) and is fixedly secured by bolts; the connecting rod (14) is hingedly connected at its lower portion to the connecting rod hinge support (15); The connecting rod hinge support (15) is fixedly connected to the wave-making plate (7) via bolts.

5. A crank stroke wave-making simulation mechanism in a hypergravity environment according to any one of claims 1 to 4, characterized in that: The eccentric distance of the eccentric shaft of the middle curved eccentric section (17) is 1 / 2 of the movement distance of the wave-making plate (7); and the internal spline structure of the shaft end of the upper driving section (16) is a standardized product.

6. A crank stroke wave-making simulation mechanism in a hypergravity environment according to claim 1 or 2, characterized in that: The maximum stroke of the wave-making plate (7) in the wave-making device (3) is 160 mm, the maximum frequency is 10 Hz, and it can simulate prototype waves with a wave height of 10 m.

7. A crank stroke wave-making simulation mechanism in a hypergravity environment according to claim 1 or 3, characterized in that: The hydraulic motor (9) of the drive module (2) is a radial piston motor with a maximum working pressure of not less than 25 MPa, a torque of not less than 500 Nm, and a maximum speed of not less than 600 rpm; the hydraulic station equipped with the geotechnical centrifuge supplies oil to the hydraulic motor (9), with a maximum flow rate of not less than 100 L / min and an oil pressure of not less than 16 MPa.

8. A method for implementing a crank-stroke wave-making simulation mechanism in a hypergravity environment, using the crank-stroke wave-making simulation mechanism in a hypergravity environment as claimed in any one of claims 1 to 7, characterized in that: The steps include: S1. Determine the test model rate, model water depth, draft depth, stroke, and actuation frequency of the wave-making plate (7) according to the simulated target wave height; S2. Place the model. If it is a seabed or nearshore shoal model, select the corresponding soil. If it is a structure model, select appropriate materials according to the scale to make the model. S3. After the model is installed, the wave-making simulation mechanism is placed against the wall of the model box, and corresponding monitoring instruments are arranged; the water depth is determined according to the similarity ratio, and water or liquid with a certain similarity relationship is injected into the model box to reach the required water level depth; S4, setting the output frequency of the hydraulic motor (9) according to step S1, and adjusting the stroke of the connecting rod (14) of the crank (11); S5, start the centrifuge, and start the hydraulic motor (9) after the centrifuge speed stabilizes; S6. Observe and record. Record the wave shape through the visual window and calibrate the wave shape according to the sensors of the monitoring instrument.

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