Gravity type net cage and dynamic research method for underwater deformation and volume monitoring of gravity type net cage

Abstract

The gravity type net cage comprises a net cage floating ring, a bottom ring and a vertical net, a plurality of stand columns are evenly arranged between the net cage floating ring and the bottom ring, and the bottom net is arranged in the bottom ring; a plurality of hydrological sensors and liquid level sensors are arranged on the net cage; a signal controller is arranged on the net cage; deformation data of a net cage model is obtained in real time through a hydrological sensor and a liquid level sensor, the data is transmitted to a receiving terminal such as a shore PC through a signal controller, experimental data obtained by the receiving terminal can be used for verifying net deformation calculated in a numerical model, and then the size of the net is calculated through the numerical model; during long-term monitoring, the size of the net cage is monitored in combination with a numerical calculation result, and different hydrological conditions such as water flow velocity can be conveniently created in a laboratory; under the support of various data, the precision of the numerical model can be improved, the practical net cage design is facilitated, and the net cage conforming to the water area condition can be designed more conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic research methods for net cages and underwater deformation and volume monitoring thereof, and in particular to a dynamic research method for gravity net cages and underwater deformation and volume monitoring thereof. Background Art

[0002] The safety of fish farming cages under different hydrological conditions has always been an important concern for users. Since fish farming is often carried out in harsh hydrological conditions, cage damage often occurs, causing great economic losses to farmers. Researching and making safe and reliable cages has always been the focus of cage users and researchers. Computer simulation research has always been the main method adopted by researchers. Due to the lack of real data, simulation models often have large errors;

[0003] Therefore, in order to solve the technical problems described above, there is an urgent need for a dynamic research method for gravity cages and their underwater deformation and volume monitoring. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a dynamic research method for gravity cage and its underwater deformation and volume monitoring.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is a gravity cage.

[0006] It comprises a cage float ring, a bottom ring and a vertical net, wherein the upper and lower ends of the vertical net are respectively connected to the cage float ring and the bottom ring;

[0007] A plurality of columns are evenly arranged between the net cage float ring and the bottom ring, and the upper and lower ends of the columns are respectively connected to the net cage float ring and the bottom ring, and are used to support the net cage float ring and the bottom ring, reduce the deformation of the vertical net, and protect the volume of the net cage;

[0008] A bottom net is provided in the bottom circle;

[0009] The cage float ring, bottom ring, vertical net, bottom net and vertical pillars constitute the cage;

[0010] The net box is provided with a plurality of hydrological sensors and liquid level sensors;

[0011] A signal controller is arranged on the net box.

[0012] As an improvement, the liquid level sensor is arranged in the middle of the vertical net, and the hydrological sensor is arranged on the bottom ring.

[0013] As an improvement, each of the liquid level sensors is connected to the signal controller via a signal transmission line;

[0014] Each of the hydrological sensors is connected to a signal controller via a signal transmission line.

[0015] As an improvement, four upright posts are provided.

[0016] A dynamic research method for underwater deformation and volume monitoring of a gravity cage, characterized by comprising the following steps:

[0017] S1. Place the experimental gravity cage model into water;

[0018] S2. The hydrological sensors and liquid level sensors on the experimental gravity cage model detect the water depth and water flow data and transmit them to the signal controller, which transmits the measured data to the receiving terminal by wired or wireless means to obtain the real-time deformation state of the cage (1) under the current working conditions. At the same time, the measured working conditions are also used as input environmental parameters in the subsequent numerical model;

[0019] The liquid level sensor essentially measures water pressure, H = kP; H: water depth, P: sensor output water pressure value, k: coefficient;

[0020] Hydrological sensors are used to measure water velocity;

[0021] The initial depth (H1) of different positions of the cage can be obtained based on the calibration coefficient (k) of the water depth sensor and the output voltage signal (P1);

[0022] Different positions of the cage will be deformed under the action of water flow. Due to the lateral displacement, the vertical net will indeed rise. The depth (H2) of different positions of the cage under the action of water flow can be obtained based on the calibration coefficient (k) of the liquid level sensor and the output water pressure value signal (P2);

[0023] The longitudinal displacement (ΔH) of the cage at different positions can be obtained through H1 and H2;

[0024] H1=kP1

[0025] H2=kP2

[0026] ΔH=H1-H2;

[0027] S3, the receiving terminal simulates the deformation of the cage according to the real-time hydrological conditions;

[0028] S4, comparison between simulated cage deformation and measured cage deformation;

[0029] The finite element model of the cage was established in the software Ansys / APDL;

[0030] Since the components of the cage are all slender structures, the cage is simulated using different line units;

[0031] The floating ring and bottom ring of the cage have large bending moments, so they are simulated using beam elements;

[0032] After the vertical net is folded, it is simulated using rod elements;

[0033] For slender structures, the Morison formula is used to calculate the fluid forces acting on the vertical and bottom nets; the input flow rate is the result measured in the above process;

[0034] The implicit method in APDL is used to perform transient analysis on the deformation of the cage under the action of water flow, and the deformation of the cage is obtained and compared with the above measurement results.

[0035] S5, modify the simulation model to make it more realistic;

[0036] After the above verification, when the difference between the numerical result and the measured result is less than 10%, the numerical result is within the acceptable range; the displacement of all nodes of the numerical result is output, and all nodes are input using CAD software to form a solid, and the volume of the solid is the volume of the cage;

[0037] S6. Use accurate models to guide large cage design;

[0038] By matching the volume result obtained above with the measured longitudinal displacement, the effect of real-time monitoring of the volume of the cage 1 can be achieved.

[0039] The advantages of the present invention compared with the prior art are:

[0040] This scheme can obtain the deformation data of the cage model in real time through the hydrological sensors and liquid level sensors, and then transmit the data to the receiving terminal such as the PC on the shore through the signal controller. The experimental data obtained by the receiving terminal can be used to verify the deformation of the net calculated in the numerical model, and then the volume of the net is calculated through the numerical model; in long-term monitoring, by combining the numerical calculation results, the volume of the cage can be monitored, which is convenient for creating different hydrological conditions in the laboratory, such as water flow velocity; with the support of various data, the accuracy of the numerical model can be improved, which is conducive to the practical cage design and more convenient to design cages that match the water conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The invention discloses a gravity cage and a dynamic research method for underwater deformation and volume monitoring of the cage.

[0042] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0043] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle.

[0044] Figure 4It is a time domain curve diagram of the longitudinal deformation of a cage under different working conditions at one position collected by a dynamic research method for a gravity cage and its underwater deformation and volume monitoring of the present invention.

[0045] Figure 5 The invention discloses a dynamic research method for a gravity cage and its underwater deformation and volume monitoring, and includes numerical calculation models of deformation at several different positions and comparison diagrams of measurement results.

[0046] Figure 6 It is a schematic diagram of cage volume calculation results under different models and different working conditions of a gravity cage and a dynamic research method for underwater deformation and volume monitoring of the present invention.

[0047] Figure 7 It is a gravity cage and a dynamic research method for underwater deformation and volume monitoring of the cage, numerical calculation results of the cage and a display diagram of the side view of the experimental cage.

[0048] As shown in the figure:

[0049] 1. Net cage, 2. Net cage float, 3. Bottom ring, 4. Vertical net, 5. Vertical column, 6. Bottom net, 7. Hydrological sensor, 8. Liquid level sensor, 9. Signal controller. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0051] Combined with Figure 1-7 , a gravity cage,

[0052] It includes a cage float ring 2, a bottom ring 3 and a vertical net 4, wherein the upper and lower ends of the vertical net 4 are respectively connected to the cage float ring 2 and the bottom ring 3;

[0053] A plurality of columns 5 are evenly arranged between the cage float ring 2 and the bottom ring 3, and the upper and lower ends of the columns 5 are respectively connected to the cage float ring 2 and the bottom ring 3, so as to support the cage float ring 2 and the bottom ring 3, reduce the deformation of the vertical net 4, and protect the volume of the cage;

[0054] A bottom net 6 is provided in the bottom circle 3;

[0055] The cage float 2, bottom ring 3, vertical net 4, bottom net 6 and vertical column 5 constitute the cage 1;

[0056] The net box 1 is provided with a plurality of hydrological sensors 7 and liquid level sensors 8;

[0057] The network box 1 is provided with a signal controller 9 .

[0058] The liquid level sensor 8 is arranged in the middle of the vertical net 4 , and the hydrological sensor 7 is arranged on the bottom ring 3 .

[0059] Each of the liquid level sensors 8 is connected to a signal controller 9 via a signal transmission line;

[0060] Each of the hydrological sensors 7 is connected to a signal controller 9 via a signal transmission line.

[0061] There are four columns 5 .

[0062] A dynamic research method for underwater deformation and volume monitoring of a gravity cage, characterized by comprising the following steps:

[0063] S1. Place the experimental gravity cage model into water;

[0064] S2. The hydrological sensor 7 and the liquid level sensor 8 on the experimental gravity cage model detect the water depth and water flow data and transmit them to the signal controller 9. The signal controller 9 transmits the measured data to the receiving terminal by wired or wireless means to obtain the real-time deformation state of the cage 1 under the current working conditions. At the same time, the measured working conditions are also used as input environmental parameters in the subsequent numerical model.

[0065] The liquid level sensor 8 essentially measures water pressure, H = kP; H: water depth, P: sensor output water pressure value, k: coefficient;

[0066] The hydrological sensor 7 is used to measure the water flow velocity;

[0067] The initial depth (H1) of the cage 1 at different positions can be obtained based on the calibration coefficient (k) of the water depth sensor and the output voltage signal (P1);

[0068] Different positions of the cage 1 will be deformed under the action of water flow. Due to the lateral displacement, the vertical net 4 will indeed rise. The depth (H2) of different positions of the cage 1 under the action of water flow can be obtained based on the calibration coefficient (k) of the liquid level sensor 8 and the output water pressure value signal (P2);

[0069] The longitudinal displacement (ΔH) of cage 1 at different positions can be obtained through H1 and H2;

[0070] H1=kP1

[0071] H2=kP2

[0072] ΔH=H1-H2;

[0073] S3, the receiving terminal simulates the deformation of the cage 1 according to the real-time hydrological conditions;

[0074] S4, comparison between simulated cage deformation and measured cage deformation;

[0075] The finite element model of cage 1 was established in the software Ansys / APDL;

[0076] Since the components of cage 1 are all slender structures, cage 1 is simulated using different line units;

[0077] The cage float 2 and bottom ring 3 have large bending moments, so they are simulated using beam elements;

[0078] After the vertical net 4 is ply-joined, it is simulated using rod elements;

[0079] For slender structures, the Morison formula is used to calculate the fluid force acting on the vertical net 4 and the bottom net 6; the input flow rate is the result measured in the above process;

[0080] The implicit method in APDL is used to perform transient analysis on the deformation of the cage under the action of water flow, and the deformation of the cage is obtained and compared with the above measurement results.

[0081] S5, modify the simulation model to make it more realistic;

[0082] After the above verification, when the difference between the numerical result and the measured result is less than 10%, the numerical result is within the acceptable range; the displacement of all nodes of the numerical result is output, and all nodes are input using CAD software to form a solid, and the volume of the solid is the volume of the cage 1;

[0083] S6. Use accurate models to guide large cage design;

[0084] By matching the volume result obtained above with the measured longitudinal displacement, the effect of real-time monitoring of the volume of the cage 1 can be achieved.

[0085] When the present invention is implemented,

[0086] S1. Place the experimental gravity cage model into water;

[0087] S2. The hydrological sensor 7 and the liquid level sensor 8 on the experimental gravity cage model detect the water depth and water flow data and transmit them to the signal controller 9. The signal controller 9 transmits the measured data to the receiving terminal by wired or wireless means to obtain the real-time deformation state of the cage 1 under the current working conditions. At the same time, the measured working conditions are also used as input environmental parameters in the subsequent numerical model.

[0088] The liquid level sensor 8 essentially measures water pressure, H = kP; H: water depth, P: sensor output water pressure value, k: coefficient;

[0089] The hydrological sensor 7 is used to measure the water flow velocity;

[0090] The initial depth (H1) of the cage 1 at different positions can be obtained based on the calibration coefficient (k) of the water depth sensor and the output voltage signal (P1);

[0091] Different positions of the cage 1 will be deformed under the action of water flow. Due to the lateral displacement, the vertical net 4 will indeed rise. The depth (H2) of different positions of the cage 1 under the action of water flow can be obtained based on the calibration coefficient (k) of the liquid level sensor 8 and the output water pressure value signal (P2);

[0092] The longitudinal displacement (ΔH) of cage 1 at different positions can be obtained through H1 and H2;

[0093] H1=kP1

[0094] H2=kP2

[0095] ΔH=H1-H2;

[0096] S3, the receiving terminal simulates the deformation of the cage 1 according to the real-time hydrological conditions, such as Figure 4 As shown, the time domain curves of the longitudinal deformation of a certain position of the cage under different working conditions are collected;

[0097] S4, comparison between simulated cage deformation and measured cage deformation;

[0098] The finite element model of cage 1 was established in the software Ansys / APDL;

[0099] Since the components of cage 1 are all slender structures, cage 1 is simulated using different line units;

[0100] The cage float 2 and bottom ring 3 have large bending moments, so they are simulated using beam elements;

[0101] After the vertical net 4 is ply-joined, it is simulated using rod elements;

[0102] For slender structures, the Morison formula is used to calculate the fluid force acting on the vertical net 4 and the bottom net 6; the input flow rate is the result measured in the above process;

[0103] The implicit method in APDL is used to perform transient analysis on the deformation of the cage under the action of water flow, and the deformation of the cage is obtained and compared with the above measurement results.

[0104] like Figure 5 As shown; for several different positions of cage 1, the implicit method in APDL is used to perform transient analysis on the deformation of the cage under the action of water flow, and the comparison diagram of the obtained numerical calculation model and the measurement results;

[0105] S5, modify the simulation model to make it more realistic;

[0106] After the above verification, when the difference between the numerical result and the measured result is less than 10%, the numerical result is within the acceptable range; the displacement of all nodes of the numerical result is output, and all nodes are input using CAD software to form a solid, and the volume of the solid is the volume of the cage 1;

[0107] like Figure 6 As shown, the volume calculation result diagram of cage 1 under different working conditions for different models;

[0108] like Figure 7 As shown, the numerical calculation result schematic diagram of cage 1 and the side view of the experimental cage; a, c are the numerical calculation result schematic diagrams, b, d are the side views of the experimental cage;

[0109] S6. Use accurate models to guide large cage design;

[0110] By matching the volume result obtained above with the measured longitudinal displacement, the effect of real-time monitoring of the volume of the cage 1 can be achieved.

[0111] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0112] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0113] In the description of the embodiments of the present invention, "plurality" means at least 2.

[0114] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0115] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A gravity cage, characterized in that: It comprises a net cage float ring (2), a bottom ring (3) and a vertical net (4), wherein the upper and lower ends of the vertical net (4) are respectively connected to the net cage float ring (2) and the bottom ring (3); A plurality of columns (5) are evenly arranged between the cage float ring (2) and the bottom ring (3), and the upper and lower ends of the columns (5) are respectively connected to the cage float ring (2) and the bottom ring (3), and are used to support the cage float ring (2) and the bottom ring (3), reduce the deformation of the vertical net (4), and protect the volume of the cage; A bottom net (6) is provided inside the bottom ring (3); The cage float (2), bottom ring (3), vertical net (4), bottom net (6) and vertical column (5) constitute a cage (1); The net box (1) is provided with a plurality of hydrological sensors (7) and liquid level sensors (8); The net box (1) is provided with a signal controller (9).

2. A gravity cage according to claim 1, characterized in that: The liquid level sensor (8) is arranged in the middle of the vertical net (4), and the hydrological sensor (7) is arranged on the bottom ring (3).

3. A gravity cage according to claim 2, characterized in that: Each of the liquid level sensors (8) is connected to a signal controller (9) via a signal transmission line; Each of the hydrological sensors (7) is connected to a signal controller (9) via a signal transmission line.

4. A gravity cage according to claim 1, characterized in that: There are four upright posts (5).

5. A dynamic research method for underwater deformation and volume monitoring of a gravity cage according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Place the experimental gravity cage model into water; S2, the hydrological sensor (7) and the liquid level sensor (8) on the experimental gravity cage model detect the water depth and water flow data and transmit them to the signal controller (9), and the signal controller (9) transmits the measured data to the receiving terminal through wired or wireless means to obtain the real-time deformation state of the cage (1) under the current working conditions. At the same time, the measured working conditions are also used as input environmental parameters in the subsequent numerical model; The liquid level sensor (8) essentially measures water pressure, H = kP; H: water depth, P: sensor output water pressure value, k: coefficient; The hydrological sensor (7) is used to measure the water flow velocity; The initial depth (H1) of the cage (1) at different positions can be obtained based on the calibration coefficient (k) of the water depth sensor and the output voltage signal (P1); Different positions of the cage (1) will be deformed under the action of water flow. Due to the lateral displacement, the vertical net (4) will indeed rise. The depth (H2) of different positions of the cage (1) under the action of water flow can be obtained based on the calibration coefficient (k) of the liquid level sensor (8) and the output water pressure value signal (P2); The longitudinal displacement (ΔH) of the cage (1) at different positions can be obtained by H1 and H2; H1=kP1 H2=kP2 ΔH=H1-H2; S3, the receiving terminal simulates the deformation of the cage (1) according to the real-time hydrological conditions; S4, comparison between simulated cage deformation and measured cage deformation; The finite element model of the cage (1) was established in the software Ansys / APDL; Since the components of the cage (1) are all slender structures, the cage (1) is simulated using different line units; The cage float (2) and bottom ring (3) are simulated using beam elements because of the large bending moment; The vertical net (4) is simulated using rod elements after plying; For slender structures, the Morison formula is used to calculate the fluid forces acting on the vertical net (4) and the bottom net (6); the input flow rate is the result measured in the above process; The implicit method in APDL is used to perform transient analysis on the deformation of the cage under the action of water flow, and the deformation of the cage is obtained and compared with the above measurement results. S5, modify the simulation model to make it more realistic; After the above verification, when the difference between the numerical result and the measured result is less than 10%, the numerical result is within the acceptable range; the displacement of all nodes of the numerical result is output, and all nodes are input using CAD software to form a solid, and the volume of the solid is the volume of the cage 1; S6. Use accurate models to guide large cage design; By matching the volume result obtained above with the measured longitudinal displacement, the effect of real-time monitoring of the volume of the cage 1 can be achieved.

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