Striking type wave generation test method under high gravity field

Abstract

The invention discloses a striking type wave making test method under a high gravity field. The method comprises the following steps: making test slurry, pouring the test slurry into a model soil box, pressurizing to form a soil sample, and burying a deep soil pressure sensor, a pore pressure sensor and a displacement sensor at a certain depth in the soil sample; processing the structure model, and pressing the structure model into the soil sample at a set depth to complete the processing of the model soil box; the model soil box is hoisted into a set position of the supergravity model box, water is added into the supergravity model to a certain height, and then the power module is fixed to the supergravity model box; placing the super-gravity model in a super-gravity field, and connecting the super-gravity model with a control system and a sensor sampling system; the test device under the super-gravity field is started, the high-power servo motor drives the wave making block to regularly beat the water surface to generate periodic waves, the wave height, frequency and wavelength parameters of the waves are adjusted by adjusting the rotation frequency of the high-power servo motor or replacing the wave making block according to test requirements, and impact and disturbance of the waves on a soil sample and a structural model are observed.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engineering physical simulation, and in particular to an impact-type wave-making test method under a hypergravity field. Background Art

[0002] Wave load is the primary load faced in marine engineering construction, and the wave-structure-foundation interaction problem is also a difficulty in marine engineering. Previous studies on this problem mainly relied on numerical simulation and normal gravity wave tank simulation methods, and lacked means to simulate waves and currents under hypergravity fields. Model tests under hypergravity fields are the only research method that can truly restore the engineering stress state. Therefore, it is necessary to develop corresponding hypergravity test simulation devices.

[0003] Currently, domestic wave and flow simulation devices for hypergravity fields primarily use rocking or push-plate wave generators. These wave generators, when placed in a model water tank, are prone to generating eddies during reciprocating motion, disrupting wave generation and resulting in poor wave generation. Furthermore, their power mechanisms are prone to seizure and wear during high-frequency motion, impacting efficiency.

[0004] Therefore, there is an urgent need to develop a new type of impact wave-generating test device and test method under a hypergravity field, which can generate periodic wave motion by regularly hitting the water surface under a hypergravity field, and truly simulate the wave-structure-foundation interaction in the ocean environment. Summary of the Invention

[0005] The purpose of this application is to provide a method for impact wave generation test under a hypergravity field to address the technical defects existing in the prior art.

[0006] The technical solutions adopted to achieve the purpose of this application are:

[0007] A method for impact wave generation test under a hypergravity field, wherein the impact wave generation test device under a hypergravity field comprises a power module, a model soil box, an absorbing plate and a hypergravity model box;

[0008] The power module is fixed to the hypergravity model box through a base. The power module includes a high-power servo motor, a crank structure and a wave-making block. The upper part of the crank structure is connected to the rotating shaft of the high-power servo motor, and the lower part of the crank structure is connected to the wave-making block to convert the rotational motion of the high-power servo motor into regular linear motion of the wave-making block.

[0009] The top of the wave-making block is connected to a linear guide rod, which is fixed to the supergravity model box through a support. The support is provided with a positioning hole, and the linear guide rod passes through the positioning hole to ensure that the wave-making block performs regular linear motion; a laser displacement sensor is provided above the wave-making block for real-time monitoring of the vertical movement of the wave-making block; and wave-absorbing materials are provided on the side of the wave-making block to reduce interference waves generated when hitting the water surface.

[0010] The model soil box is installed inside the hypergravity model box, and the wave absorbing plate is installed on the rear side of the model soil box to absorb wave energy through resonance and water flow interaction;

[0011] The impact wave-generating test method under a hypergravity field comprises the following steps:

[0012] Step 1: Dry the test soil material, sieve it, remove impurities, add water and stir it into a test mud with a water content of about 2 times the liquid limit;

[0013] Step 2: Pour the test slurry into the model soil box and pressurize it to form a soil sample with a certain density to ensure that the soil sample is completely saturated. Then, bury the soil pressure sensor, pore pressure sensor and displacement sensor at a certain depth inside the soil sample.

[0014] Step 3: Process the structural model by pressing the structural model into the soil sample at a set depth to complete the processing of the model soil box;

[0015] Step 4: After the model soil box of step 3 is processed, the model soil box is hoisted as a whole into the set position of the hypergravity model box, and then water is added to the hypergravity model to a certain height, and then the power module is fixed to the hypergravity model box;

[0016] Step 5: Place the hypergravity model in the hypergravity field and connect it to the control system and sensor sampling system;

[0017] Step 6: Start the impact wave-making test device under the hypergravity field. The high-power servo motor drives the wave-making block to regularly hit the water surface to generate periodic waves. According to the test needs, the wave height, frequency, and wavelength parameters are adjusted by adjusting the rotation frequency of the high-power servo motor or replacing the wave-making block. The impact and disturbance of the waves on the soil sample and the structural model are observed to simulate the wave-structure-foundation interaction in the marine environment.

[0018] In the above technical solution, the crank structure includes a crank and a connecting rod, one end of the crank is rotatably connected to the rotating shaft of the high-power servo motor, the other end of the crank is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is fixedly connected to the wave-making block.

[0019] In the above technical solution, the connecting rod is replaced with a connecting rod of different lengths according to the wave height to be generated in the test.

[0020] In the above technical solution, the wave-making blocks include three types: triangular wave-making blocks, hyperbolic wave-making blocks and cylindrical wave-making blocks. The cross-section of the triangular wave-making block is triangular, the cross-section of the hyperbolic wave-making block is hyperbolic, and the cross-section of the cylindrical wave-making block is rectangular.

[0021] In the above technical solution, the absorbing plate is an aluminum alloy wall plate, and the absorbing plate is provided with long strip-shaped slots at equal intervals.

[0022] In the above technical solution, the hypergravity model box includes multiple aluminum alloy wall panels, and an observation window is opened on the side of the hypergravity model box. The observation window is installed with organic glass for observing the impact of waves on the model soil box.

[0023] In the above technical solution, the model soil box includes a soil box, a soil sample and a structural model. The soil sample is arranged inside the soil box, a strain gauge is pasted on the surface of the structural model, and the structural model with the strain gauge is arranged inside the soil sample.

[0024] In the above technical solution, the soil box is an aluminum alloy soil box.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The impact-type wave-making test device under a hypergravity field of the present invention converts the rotational motion of a high-power servo motor into regular linear motion of a wave-making block, which drives the wave-making block to hit the water surface to generate waves. This avoids the eddy current interference problem caused by the reciprocating motion of the wave-making plate in the water, and improves the wave-making efficiency and accuracy.

[0027] 2. The high-power servo motor of the present invention monitors the wave parameters in real time and then adjusts the rotation frequency and distortion of the servo motor through feedback, thereby reducing the wave reflection problem, having a fast response speed and strong adjustable performance.

[0028] 3. The wave-making blocks of the present invention include three types: triangular wave-making blocks, hyperbolic wave-making blocks and cylindrical wave-making blocks. They can generate different shallow water waves and deep water waves according to needs, and can control wave height, frequency, wavelength and other parameters of the waves, and have strong adaptability to different tests.

[0029] 4. The wave-making block of the present invention is arranged on the upper part of the hypergravity model box, which does not interfere with the interior of the hypergravity model box, thereby improving the utilization rate of the internal space of the model box and expanding the scope of simulated ocean engineering.

[0030] 5. The impact wave-generating test device under the hypergravity field of the present invention can highly reproduce the wave-structure-foundation interaction process in the marine environment. It is easy to operate, highly automated, and has a stable structure, providing a stable and reliable advanced research platform for the study of marine engineering-related issues. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic structural diagram of the impact wave-generating test device under a hypergravity field described in the present invention.

[0033] Figure 2 This is a schematic diagram of the crank structure of the present invention.

[0034] Figure 3 This is a schematic structural diagram of the wave-making block described in the present invention.

[0035] Figure 4 This is a schematic cross-sectional view of the triangular wave-making block described in the present invention.

[0036] Figure 5 This is a schematic cross-sectional view of the hyperbolic wave-making block of the present invention.

[0037] Figure 6 Schematic diagram of the cross section of the cylindrical wave-making block of the present invention

[0038] Figure 7 This is a schematic diagram of the model soil box structure of the present invention.

[0039] Figure 8 Schematic diagram of the structure of the wave absorbing plate of the present invention.

[0040] Figure 9 This is a structural schematic diagram of the hypergravity model box described in the present invention.

[0041] In the figure: 1- high-power servo motor; 2- crank structure; 201- crank; 202- connecting rod; 3- wave-making block; 301- triangular wave-making block; 302- hyperbolic wave-making block; 303- cylindrical wave-making block; 304- laser displacement sensor; 305- absorbing material; 306- linear guide rod; 307- support; 4- model soil box; 401- aluminum alloy soil box; 402- soil sample; 403- structural model; 5- absorbing plate; 501- slot; 6- hypergravity model box; 601- aluminum alloy wall panel; 602- observation window. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention are further described below with reference to specific embodiments.

[0043] A high-gravity impact wave test device, see Figure 1 , including a power module, a model soil box 4, an absorbing plate 5 and a hypergravity model box 6 (during the test, the hypergravity model box 6 is placed in the hypergravity field), wherein:

[0044] The power module is fixed to the hypergravity model box 6 via a base, which can reduce the space occupancy rate within the hypergravity model box 6. The power module includes a high-power servo motor 1, a crank structure 2, and a wave-making block 3. The upper portion of the crank structure 2 is connected to the rotating shaft of the high-power servo motor 1 via bolts, and the lower portion of the crank structure 2 is connected to the wave-making block 3, thereby converting the rotational motion of the high-power servo motor 1 into regular linear motion of the wave-making block 3. The wave-making block 3 generates periodic waves by striking the water surface. The high-power servo motor 1 adjusts the torque and frequency through programming, thereby controlling the frequency of wave generation at the drive end. The high-power servo motor 1 can perform feedback adjustment based on wave monitoring parameters and adjust the rotation frequency in real time to reduce wave reflection.

[0045] See also Figure 2 The crank structure 2 includes a crank 201 and a connecting rod 202. One end of the crank 201 is rotatably connected to the rotating shaft of the high-power servo motor 1. The other end of the crank 201 is rotatably connected to one end of the connecting rod 202. The other end of the connecting rod 202 is fixedly connected to the wave-making block 3. The connecting rod 202 can be replaced with connecting rods 202 of different lengths according to the wave height to be generated in the test.

[0046] See also Figure 3 The top of the wave-making block 3 is connected with a linear guide rod 306, which is used to drive the wave-making block 3 to move vertically; the linear guide rod 306 is fixed on the supergravity model box 6 through a support 307, and a positioning hole is provided on the support 307. The linear guide rod 306 passes through the positioning hole to ensure that the wave-making block 3 moves in a regular linear manner; a laser displacement sensor 304 is provided above the wave-making block 3 to monitor the vertical movement of the wave-making block 3 in real time; and an absorbing material 305 is provided on the side of the wave-making block 3 to reduce the interference waves generated when hitting the water surface.

[0047] like Figure 4 、 Figure 5 、 Figure 6As shown, the wave-making blocks 3 of this embodiment include a triangular wave-making block 301, a hyperbolic wave-making block 302, and a cylindrical wave-making block 303. The triangular wave-making block 301 has a triangular cross-section, the hyperbolic wave-making block 302 has a hyperbolic cross-section, and the cylindrical wave-making block 303 has a rectangular cross-section. The triangular wave-making blocks 301 and the hyperbolic wave-making blocks 302 can generate deep-water waves, while the cylindrical wave-making block 303 can generate shallow-water waves.

[0048] The model soil box 4 is installed inside the supergravity model box 6, and the wave absorbing plate 5 is installed on the rear side of the model soil box 4 to absorb wave energy through resonance and water flow interaction, thereby reducing wave reflection. Figure 8 The wave absorbing plate 5 is an aluminum alloy wall plate, and the wave absorbing plate 5 is provided with long strip slots 501 at equal intervals; Figure 9 The hypergravity model box 6 includes multiple aluminum alloy wall panels 601. An observation window 602 is provided on the side of the hypergravity model box 6. The observation window 602 is installed with organic glass with sufficient transparency to facilitate the operator to observe the impact of waves on the model soil box 4.

[0049] See also Figure 7 The model soil box 4 includes a soil box 401, a soil sample 402, and a structural model 403. The soil sample 402 is placed inside the soil box 401. Strain gauges are attached to the surface of the structural model 403 to measure the internal forces of the structural model 403. The structural model 403 with strain gauges is placed inside the soil sample 402. A soil pressure sensor, a pore pressure sensor, and a displacement sensor are embedded inside the soil sample 402 to monitor the impact and disturbance of waves on the soil sample 402 and the structural model 403. The soil box 401 is made of aluminum alloy.

[0050] A test method based on an impact wave-generating test device in a hypergravity field comprises the following steps:

[0051] Step 1: Dry the test soil material, sieve it, remove impurities, add water and stir it into a test mud with a water content of about 2 times the liquid limit.

[0052] Step 2: Pour the test slurry into the model soil box 4 and pressurize it to form a soil sample 402 of a certain density, ensuring that the soil sample 402 is fully saturated. Then, bury the soil pressure sensor, pore pressure sensor and displacement sensor at a certain depth inside the soil sample 402.

[0053] Step 3, processing the structural model 403, pasting strain gauges on the surface of the structural model 403, and performing waterproofing on it, then pressing the structural model 403 into the soil sample 402 to a set depth, completing the processing of the model soil box 4.

[0054] Step 4: After the model soil box 4 of step 3 is processed, the model soil box 4 is hoisted as a whole into the set position of the supergravity model box 6, and then water is added to the supergravity model 6 to a certain height, and then the power module is fixed on the supergravity model box 6.

[0055] Step 5: Place the hypergravity model 6 in the hypergravity field and connect it to the control system and the sensor sampling system.

[0056] Step 6: Start the impact wave-making test device under the hypergravity field. The high-power servo motor 1 drives the wave-making block 3 to regularly beat the water surface to generate periodic waves. According to the test needs, the wave height, frequency, and wavelength parameters of the wave are adjusted by adjusting the rotation frequency of the high-power servo motor 1 or replacing the wave-making block 3. The impact and disturbance of the waves on the soil sample 402 and the structural model 403 are observed, and the wave-structure-foundation interaction in the marine environment is simulated to promote in-depth research on hot issues such as marine interaction theory, marine disasters, and marine exploration.

[0057] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0058] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for impact wave generation test under a hypergravity field, characterized in that: The impact wave-generating test device under hypergravity field includes a power module, a model soil box, an absorbing plate and a hypergravity model box; The power module is fixed to the hypergravity model box through a base. The power module includes a high-power servo motor, a crank structure and a wave-making block. The upper part of the crank structure is connected to the rotating shaft of the high-power servo motor, and the lower part of the crank structure is connected to the wave-making block to convert the rotational motion of the high-power servo motor into regular linear motion of the wave-making block. The top of the wave-making block is connected to a linear guide rod, which is fixed to the supergravity model box through a support. The support is provided with a positioning hole, and the linear guide rod passes through the positioning hole to ensure that the wave-making block performs regular linear motion; a laser displacement sensor is provided above the wave-making block for real-time monitoring of the vertical movement of the wave-making block; and wave-absorbing materials are provided on the side of the wave-making block to reduce interference waves generated when hitting the water surface. The model soil box is installed inside the hypergravity model box, and the wave absorbing plate is installed on the rear side of the model soil box to absorb wave energy through resonance and water flow interaction; The impact wave-generating test method under a hypergravity field comprises the following steps: Step 1: Dry the test soil material, sieve it, remove impurities, add water and stir it into a test mud with a water content of about 2 times the liquid limit; Step 2: Pour the test slurry into the model soil box and pressurize it to form a soil sample with a certain density to ensure that the soil sample is completely saturated. Then, bury the soil pressure sensor, pore pressure sensor and displacement sensor at a certain depth inside the soil sample. Step 3: Process the structural model by pressing the structural model into the soil sample at a set depth to complete the processing of the model soil box; Step 4: After the model soil box of step 3 is processed, the model soil box is hoisted as a whole into the set position of the hypergravity model box, and then water is added to the hypergravity model to a certain height, and then the power module is fixed to the hypergravity model box; Step 5: Place the hypergravity model in the hypergravity field and connect it to the control system and sensor sampling system; Step 6: Start the impact wave-making test device under the hypergravity field. The high-power servo motor drives the wave-making block to regularly hit the water surface to generate periodic waves. According to the test needs, the wave height, frequency, and wavelength parameters are adjusted by adjusting the rotation frequency of the high-power servo motor or replacing the wave-making block. The impact and disturbance of the waves on the soil sample and the structural model are observed to simulate the wave-structure-foundation interaction in the marine environment.

2. The impact wave-generating test method under hypergravity field according to claim 1, characterized in that: The crank structure includes a crank and a connecting rod. One end of the crank is rotatably connected to the rotating shaft of the high-power servo motor, the other end of the crank is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is fixedly connected to the wave-making block.

3. The impact wave-generating test method under hypergravity field according to claim 2, characterized in that: The connecting rods are replaced with connecting rods of different lengths according to the wave height to be generated in the test.

4. The impact wave-generating test method under hypergravity field according to claim 1, characterized in that: The wave-making blocks include triangular wave-making blocks, hyperbolic wave-making blocks and cylindrical wave-making blocks. The cross-section of the triangular wave-making blocks is triangular, the cross-section of the hyperbolic wave-making blocks is hyperbolic, and the cross-section of the cylindrical wave-making blocks is rectangular.

5. The impact wave-generating test method under hypergravity field according to claim 1, characterized in that: The wave absorbing plate is an aluminum alloy wall plate, and long strip slots are formed on the wave absorbing plate at equal intervals.

6. The impact wave-generating test method under hypergravity field according to claim 1, characterized in that: The hypergravity model box comprises a plurality of aluminum alloy wall panels. An observation window is provided on the side of the hypergravity model box. Organic glass is installed on the observation window for observing the impact of waves on the model soil box.

7. The impact wave-generating test method under hypergravity field according to claim 1, characterized in that: The model soil box includes a soil box, a soil sample and a structural model. The soil sample is arranged inside the soil box. A strain gauge is attached to the surface of the structural model. The structural model attached with the strain gauge is arranged inside the soil sample.

8. The impact wave-generating test method under hypergravity field according to claim 7, characterized in that: The soil box is an aluminum alloy soil box.

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