Intra-ocean solitary wave passive energy dissipation device and method

Abstract

The invention discloses a passive energy dissipation device and method for solitary waves in ocean. The passive energy dissipation device comprises a tubular honeycomb buffer body, three V-shaped angle plate arrays and a wedge-shaped plate shell. The tubular honeycomb buffer body adopts a uniform hexagonal honeycomb topology array, and a channel is reserved in an array unit for internal solitary waves to pass through; springs are embedded in the V-shaped angle plate array structure through screws and penetrate through the V-shaped angle plates, and the springs and the V-shaped angle plates are in sliding connection, so that the V-shaped angle plates can vibrate up and down; the wedge-shaped plate shell is of a wedge-shaped structure formed by intersecting the edges of one sides of two flow guide plates, flow guide channels distributed in a staggered mode are formed in the surface of each flow guide plate, and the flow guide channels are distributed to cover the whole flow guide plates. The energy density of internal solitary waves can be reduced, disordered small-amplitude fluctuation of the solitary waves is formed, and the impact force and vertical destructive power of the solitary waves are reduced.

Description

Technical Field

[0001] The present invention belongs to the field of marine internal solitary wave energy dissipation, and in particular relates to a marine internal solitary wave passive energy dissipation device and method. Background Art

[0002] With the rapid development of the offshore economy, industries such as offshore drilling platforms, offshore wind turbines, and deep-sea pipeline protection are severely impacted by internal solitary waves. Depending on the amplitude and velocity of the waves, platforms must be lifted and shut down to avoid the impact of the waves, often for several hours to several days. Once the waves have passed, the operating environment must be reconfigured, resulting in unnecessary time and maintenance costs.

[0003] In the ocean, especially in the ocean jump layer area, due to the influence of factors such as tidal effects and terrain effects, the initial disturbance gradually evolves into a solitary wave sequence during the propagation process, causing the seawater density jump layer to produce large vertical fluctuations. At the same time, the up and down flows are in a shear state, undergoing high-energy shear motion, accompanied by vertical periodic vibrations, carrying huge energy, causing horizontal impact and vertical damage to equipment fixed in the ocean density jump layer, posing a huge challenge to the continuous operation and platform safety of offshore economic platforms.

[0004] The current mainstream approach to internal solitary wave response in the offshore industry is a comprehensive "prevention-monitoring-response-recovery" management system. This involves deploying a multi-parameter sensor network to monitor seawater temperature, density stratification, and flow velocity in real time. During internal solitary wave warnings, high-risk operations (such as overhead lifting and deepwater drilling) are suspended. Following an internal solitary wave event, a comprehensive assessment of the platform's structural safety and the effectiveness of emergency measures is conducted to identify weaknesses and improve emergency response plans. The extent of damage to the platform's anchor chain caused by the internal solitary wave impact is also analyzed. This requires significant investment in manpower and resources, resulting in waste and the risk of energy leakage and marine environmental pollution. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a passive energy dissipation device for internal solitary waves in the ocean to address the shortcomings of the background technology. The device blocks the disintegration of internal solitary waves according to their direction, thereby protecting the safety and continuous operation of platforms in the offshore economic industry.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A passive energy dissipation device for internal solitary waves in the ocean, comprising:

[0008] A tubular honeycomb buffer body is used to limit the vertical movement of the internal solitary wave and reduce the wave amplitude. It includes a plurality of hexagonal tubular units that are closely connected to each other to form a honeycomb topology array. The hexagonal tubular units form a through channel for the internal solitary wave to pass through.

[0009] Multiple V-shaped gusset arrays are arranged in parallel behind the tubular honeycomb buffer body to break up the internal solitary wave energy through vibration and reflection. Each V-shaped gusset array includes:

[0010] Fixed frame;

[0011] Multiple V-shaped angle plates are arranged in a matrix in the fixed frame. Each column of the V-shaped angle plate groups is connected in series by two screws arranged in parallel in front and back, namely a first screw connected in series to the open end of the V-shaped angle plate and a second screw connected in series to the closed end of the V-shaped angle plate, wherein:

[0012] A first spring is nested and supported between the open ends of each two V-shaped angle plates on the first screw, and a second spring is nested and supported between the closed ends of each two V-shaped angle plates on the second screw;

[0013] The V-shaped angle plates on two adjacent V-shaped angle plate arrays are arranged in a staggered manner;

[0014] The wedge-shaped plate shell is formed by the intersection of one side edges of two guide plates to form a wedge-shaped structure, which is used to integrate turbulence and derive small-amplitude fluctuations. Multiple V-shaped angle plate arrays are embedded in the wedge-shaped guide plate shell, and the surface of the guide plate is provided with staggered guide channels, which cover the entire surface of the guide plate.

[0015] Beneficial effects: The present invention can block and dissipate energy of internal solitary waves. First, the kinematic constraints are imposed on the internal solitary waves through the tubular honeycomb buffer to reduce the amplitude. The internal solitary waves passing through the tubular honeycomb buffer enter the array of multiple V-shaped angle plates. Due to the vertical vibration of the internal solitary waves, the upper and lower vibrations of the V-shaped angle plates are driven to stir the density stratification. At the same time, the internal solitary waves will continue to reflect in the V-shaped angle plates to reduce the energy density, forcing them to be converted into disordered turbulence. Finally, the turbulence is blocked by the wedge-shaped plate shell, and the derivation device forms disordered small-amplitude fluctuations.

[0016] In an optional embodiment, the open end of the V-shaped angle plate is arranged to face the tubular honeycomb buffer body, and the opening angle is 45° to 60°.

[0017] Beneficial effect: The V-shaped angle plate is set to construct an obstacle to block the internal solitary wave, and the continuous reflection mechanism is used to destroy the shear motion of the internal solitary wave.

[0018] In an optional embodiment, the wedge-shaped guide plate shell is formed by two guide plates fixedly connected at an opening angle of 50° to 60° to form a wedge-shaped structure, the opening direction is the same as the opening direction of the V-shaped angle plate, and the contact edges of the two guide plates are fastened by welding or bolts.

[0019] In an optional embodiment, the surface of the V-shaped angle plate is coated with a salt-resistant coating.

[0020] Beneficial effect: The device of the invention is prevented from being corroded and damaged by salt water in seawater, thereby increasing the service life of the device.

[0021] In an optional embodiment, the surface of the wedge-shaped guide plate shell is coated with a salt-resistant coating and a biological warning coating.

[0022] Beneficial effects: The device of the invention is prevented from being corroded and damaged by salt water in seawater, the service life of the device is increased, damage caused by impact of marine organisms in the marine environment is avoided, and the impact on the marine biological environment is reduced.

[0023] In an optional embodiment, the V-shaped angle plate array includes three, and the first V-shaped angle plate array satisfies the requirement of 7*6 V-shaped angle plates along the height and width directions, and the dimensions of each part satisfy the following equation:

[0024] 8L1+7h1+2a=H1

[0025] 8L2+7h2+2a=H1

[0026] 6l+7b <c

[0027] The second V-shaped angle plate array can meet the requirements of setting 7*5 V-shaped angle plates along the height and width directions, and the dimensions of each part meet the following equations:

[0028] 8L1+7h1+2a=H2

[0029] 8L1+7h2+2a=H2

[0030] 5l+6b <c

[0031] The third V-shaped angle plate array can satisfy the requirement of setting 6*6 V-shaped angle plates along the height and width directions, and the dimensions of each part satisfy the following equations:

[0032] 7L1+6h1+2a=H3

[0033] 7L1+6h2+2a=H3

[0034] 6l+7b <c

[0035] Wherein, L1 is the length of the first spring; h1 is the length of the first screw rod penetrating the V-shaped angle plate; h2 is the length of the second screw rod penetrating the V-shaped angle plate; H1 is the screw length of the first V-shaped angle plate array; H2 is the screw length of the second V-shaped angle plate array; H3 is the screw length of the third V-shaped angle plate array;

[0036] a is the thickness of the fixed frame;

[0037] l is the width of the V-shaped gusset;

[0038] b is the distance between two adjacent V-shaped angle plates;

[0039] c is the width of the guide plate.

[0040] In an optional embodiment, three V-shaped angle plate arrays are nested in the wedge-shaped deflector housing by bolts, and the dimensions of each array must satisfy the following equations:

[0041]

[0042] Where, f is the length of the guide plate;

[0043] Δx1 is the distance between the first V-shaped gusset array and the second V-shaped gusset array;

[0044] Δx2 is the distance between the second V-shaped angle plate array and the third V-shaped angle plate array.

[0045] The present invention further discloses an energy dissipation method based on the passive energy dissipation device for marine internal solitary waves. When an internal solitary wave strikes, it is first blocked by a tubular honeycomb buffer. Entering the tubular honeycomb buffer will restrict the vertical movement of the internal solitary wave, reduce its amplitude, and dissipate energy.

[0046] After passing through the tubular honeycomb buffer and entering the first V-shaped angular plate array, the internal solitary wave impacts the first V-shaped angular plate. Due to the strong vertical motion force of the internal solitary wave, it drives the V-shaped angular plate to vibrate up and down, continuously compressing the upper and lower second springs and first springs. This causes the first V-shaped angular plate array to disturb the local water density and flow velocity, forcing the internal solitary wave to break up into disordered turbulence and transform into multiple small-amplitude fluctuations. This operation is repeated for the other V-shaped angular plates in the first V-shaped angular plate array.

[0047] The unbroken internal solitary waves passing through the gap of the first V-shaped angular plate array will enter the second V-shaped angular plate array staggered with the first V-shaped angular plate array. The V-shaped angular plates will repeat the operation of the first V-shaped angular plate array to break up the internal solitary wave disturbance.

[0048] The residual wave after passing through the first V-shaped angular plate array and the second V-shaped angular plate array will enter the third V-shaped angular plate array, where the V-shaped angular plates repeat the operation in the first V-shaped angular plate array to split the internal solitary wave disturbance.

[0049] After passing through the three V-shaped angle plate arrays, the internal solitary waves are transformed into disordered turbulence and enter the wedge plate shell. Driven by the subsequent fluid, the turbulent flow enters the guide channel of the wedge plate shell and is integrated into fluctuations with smaller amplitude and velocity, completing the energy dissipation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 Schematic diagram of a tubular honeycomb buffer body in Example 1 of the present invention;

[0051] Figure 2 This is a schematic diagram of a V-shaped angle plate in Example 1 of the present invention;

[0052] Figure 3 This is a schematic diagram of the deconstruction of the V-shaped gusset array in Example 1 of the present invention;

[0053] Figure 4 This is a dimensional diagram of the first V-shaped gusset array in Example 1 of the present invention;

[0054] Figure 5 This is a dimensional diagram of the first V-shaped gusset array in Example 1 of the present invention;

[0055] Figure 6 This is a dimensional diagram of the first V-shaped gusset array in Example 1 of the present invention;

[0056] Figure 7 This is a schematic diagram of a wedge-shaped plate housing in Example 1 of the present invention;

[0057] Figure 8 Schematic diagram of a device according to embodiment 1 of the present invention;

[0058] Figure 9 This is a schematic diagram of the deconstruction of the device of embodiment 1 of the present invention;

[0059] Figure 10 This is a diagram showing the working principle of the V-shaped angle plate of the present invention;

[0060] Figure 11 The density layer height difference is 20cm. The left picture is the waveform diagram before the invention device, and the right picture is the waveform diagram after the invention device;

[0061] Figure 12 The density layer height difference is 25cm. The left picture is the waveform diagram before the invention device, and the right picture is the waveform diagram after the invention device;

[0062] Figure 13 The density layer height difference is 30cm. The left picture is the waveform before the invention device, and the right picture is the waveform after the invention device.

[0063] In the figure, 1. wedge-shaped plate shell; 2. tubular honeycomb buffer body; 3. V-shaped angle plate; 4. fixing frame on the first V-shaped angle plate array; 5. screw on the first V-shaped angle plate array; 6. second spring; 7. first spring; 8. fixing frame on the first V-shaped angle plate array; 9. screw on the second V-shaped angle plate array; 12. fixing frame on the third V-shaped angle plate array; 13. screw on the third V-shaped angle plate array. DETAILED DESCRIPTION

[0064] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings:

[0065] A passive energy dissipation device for solitary waves in the ocean, such as Figure 7 、 8 As shown, it includes a honeycomb mesh 2, three V-shaped angle plates arranged in an array, three sizes of M4 screws, three sizes of fixing frames, and springs.

[0066] The first V-shaped gusset array includes a fixing frame;

[0067] A plurality of V-shaped angle plates are arranged in a matrix in the fixed frame. The first V-shaped angle plate array is provided with 7*6 V-shaped angle plates 3 in the height and width directions. Each column of the V-shaped angle plate groups is connected in series by two screws arranged in parallel in front and back, and a sliding connection is adopted. The first screw is connected in series to the open end of the V-shaped angle plate and the second screw is connected in series to the closed end of the V-shaped angle plate.

[0068] A first spring is supported on the first screw between the open ends of each two V-shaped angle plates, and a second spring is supported on the second screw between the closed ends of each two V-shaped angle plates. In this embodiment, the first spring and the second spring have the same elastic properties, and the length ratio of the first spring to the second spring is 9:11;

[0069] The structure of the second V-shaped angle plate array is the same as that of the first V-shaped angle plate array, except that 7*5 V-shaped angle plates 3 are provided along the height and width directions of the second V-shaped angle plate array.

[0070] The structure of the third V-shaped angle plate array is the same as that of the first V-shaped angle plate array, except that 6*6 V-shaped angle plates 3 are provided along the height and width directions of the third V-shaped angle plate array.

[0071] The purpose of the above design is to make the V-shaped angle plates on two adjacent V-shaped angle plate arrays staggered;

[0072] The energy dissipation method of the passive energy dissipation device for internal solitary waves in the ocean described in the present invention is that when an internal solitary wave hits, the tubular honeycomb buffer body 2 of the present invention will first block it. Entering the tubular honeycomb buffer body 2 will cause its vertical movement to be restricted, the amplitude to be reduced, and energy dissipation to be performed.

[0073] After passing through the tubular honeycomb buffer body 2 and entering the first V-shaped angle plate array, the internal solitary wave collides with the V-shaped angle plate 3. Due to the strong vertical motion force of the internal solitary wave, the V-shaped angle plate 3 is driven to vibrate up and down, continuously compressing the upper and lower second springs 6 and first springs 7. The second spring 6 supports one side of the V-shaped angle plate 3, and the first spring 7 supports the other side of the V-shaped angle plate 3, so that the array disturbs the local water density and flow rate, forcing it to break down into disordered turbulence and transform into multiple small-amplitude fluctuations. This operation is repeated for other V-shaped angle plates in the first array.

[0074] The unbroken internal solitary waves passing through the gap of the first V-shaped angular plate array will enter the second V-shaped angular plate array staggered with the first array. The three V-shaped angular plates will operate on the first V-shaped angular plate array to break up the internal solitary wave disturbance.

[0075] The afterwaves after passing through the first and second V-shaped angular plate arrays will enter the third V-shaped angular plate array, where the three V-shaped angular plates in the third V-shaped angular plate array operate in the first V-shaped angular plate array to perform internal solitary wave disturbance decomposition.

[0076] After passing through the three V-shaped angle plate arrays, the internal solitary waves are transformed into disordered turbulence and enter the wedge plate shell 1. Driven by the subsequent fluid, the turbulent flow enters the guide channel of the wedge plate shell 1 and is integrated into fluctuations with smaller amplitude and velocity, completing the energy dissipation process.

[0077] The force analysis of the present invention is as follows:

[0078] like Figure 2 、 3 As shown in , 4, 5, 6, and 7, let the screw length of the first V-shaped angular plate array be H1, let the screw length of the second V-shaped angular plate array be H2, let the screw length of the third V-shaped angular plate array be H3, the second spring length be L1, the first spring length be L2, the first screw penetrating the open end of the V-shaped angular plate has a penetration length of h1 in the V-shaped angular plate, and the second screw penetrating the closed end has a penetration length of h2 in the V-shaped angular plate, the thickness of the fixed frame is a, the width of the V-shaped angular plate is l, the distance between two adjacent V-shaped angular plates is b, the width of the guide plate is c, the opening height of the wedge plate shell is d, the length of the wedge plate shell is f, the interval between the first V-shaped angular plate array and the second V-shaped angular plate array is Δx1, and the interval between the second V-shaped angular plate array and the third V-shaped angular plate array is Δx2, is the real-time length of the second spring, is the real-time length of the first spring.

[0079] To ensure that the first V-shaped angle plate array can meet the requirements of 7*6 V-shaped angle plates along the height and width directions, the dimensions of each part must meet the following equations:

[0080] 8L1+7h1+2a=H1

[0081] 8L2+7h2+2a=H1

[0082] 6l+7b <c

[0083] To ensure that the second V-shaped angle plate array can meet the requirements of 7*5 V-shaped angle plates along the height and width directions, the dimensions of each part must meet the following equations:

[0084] 8L1+7h1+2a=H2

[0085] 8L1+7h2+2a=H2

[0086] 5l+6b <c

[0087] To ensure that the third V-shaped angle plate array can meet the requirements of setting 6*6 V-shaped angle plates along the height and width directions, the dimensions of each part must meet the following equations:

[0088] 7L1+6h1+2a=H3

[0089] 7L1+6h2+2a=H3

[0090] 6l+7b <c

[0091] To ensure that the three V-shaped angle plate arrays can be nested in the wedge-shaped deflector shell by bolts, the dimensions must satisfy the following equations:

[0092]

[0093] The present invention uses a scaled-down model to conduct experimental verification in a solitary wave generating tank in the laboratory, and uses individual force collapse to generate waves. The horizontal scale of the individual force collapse potential well is 0.5m. Impact experiments with density layer height differences of 20cm, 25cm, and 30cm are carried out respectively to verify the energy dissipation performance of the invention device in response to different wave speeds and wave heights. Under the same conditions, the waveform diagrams before and after the invention device are measured respectively. The energy dissipation effect of the invention device can be clearly seen from the waveform diagram, and it still has an energy dissipation effect on a series of subsequent wake waves. The waveform diagram is as follows Figures 11-13 As shown,

[0094] Assuming that the maximum wave height before the invention device is l1, and the maximum wave height of the internal solitary wave after the invention device is l2, the wave height suppression rate formula is:

[0095] Density layer height difference is 20cm wave height suppression rate Density layer height difference is 25cm wave height suppression rate Density layer height difference is 30cm wave height suppression rate

Claims

1. A passive energy dissipation device for internal solitary waves in the ocean, characterized in that: Including arranged in sequence along the propagation direction of the internal solitary wave: A tubular honeycomb buffer body is used to limit the vertical movement of the internal solitary wave and reduce the wave amplitude. It includes a plurality of hexagonal tubular units that are closely connected to each other to form a honeycomb topology array. The hexagonal tubular units form a through channel for the internal solitary wave to pass through. A plurality of V-shaped angular plate arrays are sequentially arranged in parallel with each other behind the tubular honeycomb buffer body (2) to crack the internal solitary wave energy through vibration and reflection. Each V-shaped angular plate array comprises: Fixed frame; Multiple V-shaped angle plates are arranged in a matrix in the fixed frame. Each column of the V-shaped angle plate groups is connected in series by two screws arranged in parallel in front and back, namely a first screw connected in series to the open end of the V-shaped angle plate and a second screw connected in series to the closed end of the V-shaped angle plate, wherein: A first spring is nested and supported between the open ends of each two V-shaped angle plates on the first screw, and a second spring is nested and supported between the closed ends of each two V-shaped angle plates on the second screw; The V-shaped angle plates on two adjacent V-shaped angle plate arrays are arranged in a staggered manner; A wedge-shaped plate shell (1) is formed by intersecting one side edge of two guide plates to form a wedge-shaped structure, which is used to integrate turbulent flow and guide small-amplitude fluctuations. A plurality of V-shaped angle plate arrays are embedded in the wedge-shaped guide plate shell (1), and the surface of the guide plate is provided with staggered guide channels, which cover the entire surface of the guide plate.

2. The passive energy dissipation device for internal solitary waves in the ocean according to claim 1, characterized in that: The open end of the V-shaped angle plate is arranged to face the tubular honeycomb buffer body, and the opening angle is 45° to 60°.

3. The passive energy dissipation device for internal solitary waves in the ocean according to claim 1, characterized in that: The wedge-shaped guide plate housing (1) is formed by two guide plates fixedly connected at an opening angle of 50° to 60° to form a wedge-shaped structure, the opening direction is the same as the opening direction of the V-shaped angle plate, and the contact edges of the two guide plates are fastened by welding or bolts.

4. The passive energy dissipation device for internal solitary waves in the ocean according to claim 1, characterized in that: The surface of the V-shaped angle plate is coated with a salt-resistant coating.

5. The passive energy dissipation device for internal solitary waves in the ocean according to claim 1, characterized in that: The surface of the wedge-shaped guide plate housing (1) is coated with a salt-resistant coating and a biological warning coating.

6. The passive energy dissipation device for internal solitary waves in the ocean according to claim 1, characterized in that: The V-shaped angle plate arrays include three, which are fixed in the wedge plate housing by bolts. The first V-shaped angle plate array satisfies the requirement of 7*6 V-shaped angle plates in the height and width directions, and the dimensions of each part satisfy the following equation: 8L1+7h1+2a=H1 8L2+7h2+2a=H1 6l+7b <c The second V-shaped angle plate array satisfies the requirement of 7*5 V-shaped angle plates along the height and width directions, and the dimensions of each part satisfy the following equations: 8L1+7h1+2a=H2 8L1+7h2+2a=H2 5l+6b <c The third V-shaped angle plate array satisfies the requirement of setting 6*6 V-shaped angle plates along the height and width directions, and the dimensions of each part satisfy the following equations: 7L1+6h1+2a=H3 7L1+6h2+2a=H3 6l+7b <c Wherein, L1 is the length of the first spring; h1 is the length of the first screw rod penetrating the V-shaped angle plate; h2 is the length of the second screw rod penetrating the V-shaped angle plate; H1 is the screw length of the first V-shaped angle plate array; H2 is the screw length of the second V-shaped angle plate array; H3 is the screw length of the third V-shaped angle plate array; a is the thickness of the fixed frame; l is the width of the V-shaped gusset; b is the distance between two adjacent V-shaped angle plates; c is the width of the guide plate.

7. The passive energy dissipation device for internal solitary waves in the ocean according to claim 6, characterized in that: The three V-shaped angle plate arrays are nested in the wedge-shaped deflector shell by bolts, and the dimensions satisfy the following equations: Where, f is the length of the guide plate; Δx1 is the distance between the first V-shaped gusset array and the second V-shaped gusset array; Δx2 is the distance between the second V-shaped angle plate array and the third V-shaped angle plate array.

8. An energy dissipation method based on the passive energy dissipation device for internal solitary waves in the ocean according to claim 6 or 7, characterized in that: When the internal solitary wave impacts, it will first be blocked by the tubular honeycomb buffer body (2). Entering the tubular honeycomb buffer body (2) will result in the vertical movement of the internal solitary wave being restricted, the amplitude being reduced, and energy being dissipated; After passing through the tubular honeycomb buffer body (2) and entering the first V-shaped angle plate array, the internal solitary wave hits the first V-shaped angle plate (3). Due to the strong vertical motion force of the internal solitary wave, the V-shaped angle plate (3) is driven to vibrate up and down, continuously compressing the upper and lower second springs (6) and the first spring (7), so that the first V-shaped angle plate array disturbs the local water density and flow velocity, forcing the internal solitary wave to break up into disordered turbulence and transform into multiple small-amplitude fluctuations. The other V-shaped angle plates in the first V-shaped angle plate array repeat this operation; The internal solitary wave that has not been split after passing through the gap of the first V-shaped angular plate array will enter the second V-shaped angular plate array that is staggered with the first V-shaped angular plate array, and the V-shaped angular plate (3) will repeat the operation of the first V-shaped angular plate array to split the internal solitary wave disturbance. The residual wave after passing through the first V-shaped angular plate array and the second V-shaped angular plate array will enter the third V-shaped angular plate array, and the V-shaped angular plate (3) in the third V-shaped angular plate array repeats the operation of the first V-shaped angular plate array to perform internal solitary wave disturbance decomposition; After the internal solitary wave of the three V-shaped angle plate arrays is transformed into disordered turbulence, it enters the wedge plate shell (1). The turbulent flow direction enters the guide channel of the wedge plate shell (1) under the push of the subsequent fluid and is integrated into a wave with smaller amplitude and velocity, completing the energy dissipation of the entire process.

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