A dynamic cable monitoring device and method for offshore wind power.

Abstract

This invention discloses a monitoring device and method for monitoring dynamic cables in offshore wind power, comprising: a sonar and multiple sonar bounce devices; the sonar is installed on the underwater portion of an offshore wind power floating foundation platform; the multiple sonar bounce devices are spaced apart on the dynamic cable. This invention, through the sonar installed on the underwater portion of the offshore wind power floating foundation platform and the multiple sonar bounce devices spaced apart on the dynamic cable, can acquire the morphology of the dynamic cable in real time, thereby enabling fatigue analysis of the dynamic cable and providing strong support for preventing dynamic cable failures.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power technology, and in particular to an offshore wind power dynamic cable monitoring device and its monitoring method. Background Technology

[0002] Offshore wind power dynamic cables are located in the wave zone between the floating wind turbine foundation platform and the seabed. Due to the complex hydrological conditions, the top of the cable connected to the floating body is subjected to a combination of large tensile loads and repeated bending loads under the action of the floating body's motion, wave loads, and its own weight. The load cycle is often long, representing typical low-cycle vibration fatigue loads. During service, long-term dynamic response leads to the accumulation of alternating stresses in the internal units of the dynamic cable, resulting in damage and fatigue failure. Furthermore, due to its inherent compliance, coupled with its typical internal component arrangement and geometry, the dynamic cable is particularly susceptible to alternating bending loads. The radial compression layer / components are affected by relative motion, leading to significant risks such as wear, deformation, and degradation of physical properties. To prevent failure during the service life of the dynamic cable, morphological monitoring is essential. However, due to complex sea conditions, varying cable depths, and the influence of ocean currents, current technology cannot achieve real-time monitoring of the dynamic cable. Summary of the Invention

[0003] This invention provides a monitoring device and method for monitoring dynamic cables in offshore wind power, which solves the technical problem that existing technologies cannot achieve real-time monitoring of dynamic cables.

[0004] The technical solution of the present invention is: a dynamic cable monitoring device for offshore wind power, comprising: a sonar and multiple sonar bounce devices;

[0005] The sonar is installed on the underwater portion of the offshore wind power floating foundation platform.

[0006] The multiple sonar bounce devices are spaced apart on the dynamic cable.

[0007] The sonar bounce device is either integrated into the dynamic cable or suspended above the dynamic cable.

[0008] Furthermore, when the sonar bounce device is suspended and mounted on the upper part of the dynamic cable, the sonar bounce device includes a positioning element and a sonar bounce device body;

[0009] One side of the sonar bounce device body is provided with a sonar bounce surface, the upper part of the sonar bounce device body is provided with a buoyancy adjustment cavity, and the lower part of the sonar bounce device body is fixedly provided with a movable connecting piece.

[0010] One end of the positioning component is connected to the movable connector of the sonar bounce device body, and the other end is connected to the dynamic cable, which is used to control the position and bounce direction of the sonar bounce device body.

[0011] Furthermore, the plurality of sonar bounce devices include a first sonar bounce device and a second sonar bounce device;

[0012] The hardness and density of the sonar reflector surface of the second sonar reflector are greater than those of the sonar reflector surface of the first sonar reflector.

[0013] The second sonar bounce device is installed at a key location on the dynamic cable, while the first sonar bounce device is installed at other locations on the dynamic cable.

[0014] Furthermore, the sonar reflector surface is an arc surface concave to the body of the sonar reflector device;

[0015] The hardness and density of the material of the sonar reflector surface are greater than those of the rest of the sonar reflector body.

[0016] Furthermore, the positioning component includes a socket, a limiting connector, and a closing component;

[0017] The socket is used to attach the positioning member to the armor of the dynamic cable;

[0018] The limiting connector is used to connect the movable connector of the sonar bounce device body and to control the bounce direction of the sonar bounce device body;

[0019] The closure is used to close the socket.

[0020] Furthermore, the limiting connector includes two parallel connecting plates, one end of which is fixedly connected to the sleeve, and the other end is provided with a first shaft hole;

[0021] The movable connector is plate-shaped, with one end fixedly connected to the bottom of the sonar bounce device body and the other end having a second shaft hole.

[0022] The movable connector is inserted between the two parallel connecting plates, and the first shaft hole and the second shaft hole are connected by a shaft pin. The movable connector can rotate along the shaft pin.

[0023] Furthermore, a buoyancy adjustment cavity is located in the space near the top inside the sonar bounce device body. The buoyancy adjustment cavity is equipped with a pressure adjustment device, which is used to adjust the air pressure inside the buoyancy adjustment cavity according to the depth of the sonar bounce device body.

[0024] Furthermore, the pressure regulating device includes a cylinder and a piston;

[0025] One end of the cylinder is connected to the buoyancy adjustment chamber, and the piston is fitted inside the cylinder liner at the other end;

[0026] The piston is provided with a limiting protection cap at the end away from the cylinder liner, and the diameter of the limiting protection cap is larger than the diameter of the cylinder liner.

[0027] Based on the aforementioned offshore wind power dynamic cable monitoring device, the present invention also provides an offshore wind power dynamic cable monitoring method, comprising:

[0028] Sound waves of a specific frequency are emitted by the sonar transmitting device installed on the underwater part of the offshore wind turbine floating foundation platform.

[0029] The sonar receiving device receives the reflected sound waves from multiple sonar reflectors spaced apart on the dynamic cable.

[0030] The real-time morphology of the dynamic cable is calculated based on the parameters of the sound waves transmitted by the transmitting device, the parameters of the reflected sound waves received by the receiving device, and the hydrological parameters.

[0031] Furthermore, the aforementioned calculation of the real-time morphology of the dynamic cable based on the parameters of the sound waves transmitted by the transmitting device, the parameters of the reflected sound waves received by the receiving device, and the hydrological parameters includes:

[0032] Obtain hydrological parameters, including seawater density and temperature;

[0033] Acquiring the parameters of the transmitted sound wave, including: the time during which the transmitting device transmits a sound wave of a specific frequency;

[0034] Acquiring the parameters of the received sound wave includes: the time and angle at which the receiving device receives the reflected sound wave;

[0035] The real-time morphology of the dynamic cable is calculated based on the hydrological parameters, transmitted acoustic parameters, and received acoustic parameters.

[0036] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: by using sonar installed on the underwater part of the offshore wind power floating foundation platform and multiple sonar bounce devices spaced apart on the dynamic cable, the real-time morphology of the dynamic cable in the sea can be obtained in real time, thereby enabling fatigue analysis of the dynamic cable and providing strong support for preventing dynamic cable failures. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the overall installation of the offshore wind power dynamic cable monitoring device in an embodiment of the present invention;

[0039] Figure 2 This is a front view of the sonar bounce device body in an embodiment of the present invention.

[0040] Figure 3 This is a side view of the sonar bounce device body in an embodiment of the present invention;

[0041] Figure 4 This is a front view of the positioning element in an embodiment of the present invention;

[0042] Figure 5 This is a side view of the positioning element in an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the installation structure of the sonar bounce device in an embodiment of the present invention.

[0044] Among them, 1-first sonar bounce device; 1'-second sonar bounce device; 101-sonar bounce device body; 102-sonar bounce surface; 103-buoyancy adjustment cavity; 104-movable connector; 106-pressure adjustment device; 201-sleeve; 202-limiting connector; 203-closure; 3-offshore wind power floating foundation platform; 4-dynamic cable; 5-sonar; 6-shaft pin. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] refer to Figures 1-6 As shown in the figure, an embodiment of the present invention provides a dynamic cable monitoring device for offshore wind power, comprising: a sonar 5 and a plurality of sonar bounce devices; the sonar 5 is installed in the underwater part of the offshore wind power floating foundation platform 3; the plurality of sonar bounce devices are spaced apart on the dynamic cable 4.

[0047] Based on the above-mentioned offshore wind power dynamic cable monitoring device, a specific frequency sound wave can be emitted by the transmitting device of the sonar 5 installed in the underwater part of the offshore wind power floating foundation platform 3; the receiving device of the sonar 5 receives the reflected sound waves from multiple sonar reflectors spaced apart on the dynamic cable 4; and the real-time shape of the dynamic cable 4 is calculated based on the parameters of the sound wave emitted by the transmitting device, the parameters of the reflected sound wave received by the receiving device, and the hydrological parameters.

[0048] The sonar 5 in this embodiment can be a sonar in the prior art, including a sound wave transmitting device and a receiving device. The sonar 5 can adopt a column structure and be directly fixed to the underwater part of the offshore wind power floating foundation platform 3 by welding or other fixing methods. In order to effectively protect the sonar 5, a protective shell of plastic or other materials can be installed on the outside of the sonar 5 without affecting the transmission and reception of sonar signals.

[0049] The aforementioned sonar reflector can be integrated into the dynamic cable 4. Since the dynamic cable 4 is generally double-armored, it can be integrated with the sonar reflector through the armor. This method utilizes the armor layer to protect both the dynamic cable 4 and the sonar reflector, and also uses the internally installed sonar reflector to obtain the shape of the dynamic cable 4. This structure is relatively durable and simple to construct; the dynamic cable 4 can be directly placed in the sea. However, this structure makes sound waves susceptible to interference from the cable itself, thus requiring the sonar reflector to have a larger volume, density, or rigidity. Furthermore, this structure requires significant modifications to the dynamic cable 4, and cable transportation is more complex, as it cannot be wound onto a reel, thereby increasing production and transportation costs.

[0050] In a preferred embodiment, the sonar bounce device can be suspended and installed above the dynamic cable. Specifically, the sonar bounce device includes a positioning component and a sonar bounce device body 101. One side of the sonar bounce device body 101 is provided with a sonar bounce surface 102, the upper part of the sonar bounce device body 101 is provided with a buoyancy adjustment cavity 103, and the lower part of the sonar bounce device body 101 is fixedly provided with a movable connector 104. One end of the positioning component is connected to the movable connector 104 of the sonar bounce device body 101, and the other end is connected to the dynamic cable 4, for controlling the position and bounce direction of the sonar bounce device body 101.

[0051] In a preferred embodiment, the sonar reflector surface 102 is an arc surface concave within the sonar reflector device body 101. Typically, when a sonar emits a sound wave signal, it is reflected in different directions due to the varying shapes of objects. This results in the sonar receiving only a small portion of the emitted signal. Analyzing these reflected signals requires a large-area sound wave receiving device, such as a sonar array, or increased power from the sound wave transmitting device, which obviously increases the manufacturing cost of the sonar. This embodiment, by making the sonar reflector surface 102 concave within the sonar reflector device body 101, ensures that most of the sound waves return along their original path after contacting the reflector surface. Compared to ordinary spherical sonar beacons, the structure of this embodiment can significantly reduce the manufacturing and usage costs of the sonar itself and improve monitoring accuracy.

[0052] The sonar reflector body 101 of this embodiment can be manufactured as a single piece. Preferably, it can be manufactured using a split manufacturing method. For example, the sonar reflector surface 102 and other parts of the sonar reflector body 101 can be manufactured separately and then assembled into one piece by common methods such as bonding or screwing. Using this manufacturing method, the hardness and density of the material of the sonar reflector surface 102 can be greater than those of the other parts of the sonar reflector body 101. For example, the sonar reflector surface 102 can be made of ceramic, marble, or alloy, while the other parts can be made of engineering plastic. Using the above materials and structure can effectively improve the reflectivity of the sonar reflector surface 102 to reflect sound waves, thereby improving the accuracy of monitoring. The other parts can be made of materials with lower hardness and density, which can effectively reduce the density of the sonar reflector body 101 while reducing the manufacturing cost of the sonar reflector body 101. This allows the sonar reflector body 101 to float in seawater, preventing it from sinking and thus effectively receiving and reflecting sonar sound waves.

[0053] As a preferred embodiment, the surface of the sonar bounce device body 101 can be coated with a layer of hull paint. Since hull paint can inhibit the growth of seabed organisms, it can prevent seaweed or shellfish from parasitizing the sonar bounce device body 101, so that the sonar bounce device body 101 can maintain a strong sound wave bounce effect in seawater for a long time.

[0054] The positioning component in this embodiment includes a sleeve 201, a limiting connector 202, and a closing component 203. Their specific functions are as follows: the sleeve 201 is used to attach the positioning component to the armor of the dynamic cable 4; the limiting connector 202 is used to connect the movable connector of the sonar bounce device body and to control the bounce direction of the sonar bounce device body; and the closing component 203 is used to close the sleeve.

[0055] In a preferred embodiment, the socket 201 can be made of elastic plastic or metal, and is ring-shaped with an open end; the limiting connector 202 can include two parallel connecting plates, one end of which is fixedly connected to the end of the socket 201 away from the opening, and the other end is provided with a first shaft hole; the movable connector 104 is plate-shaped, one end of which is fixedly connected to the bottom of the sonar bounce device body 101, and the other end is provided with a second shaft hole; the closing member 203 is provided at the open end of the socket 201, and can be in the form of a bayonet or a bolt hole to close the end of the socket 201 away from the opening.

[0056] In use, the positioning component can be pre-installed on the dynamic cable 4 or installed during cable laying. During dynamic cable laying, the movable connector 104 is inserted between the two parallel connecting plates. The first and second shaft holes are connected by a shaft pin 6, and the two parallel connecting plates limit the movement of the plate-shaped movable connector 104, ensuring that the movable connector 104 can only rotate along the shaft pin 6. This ensures that the sonar reflector surface 102 of the sonar reflector body 101 always faces the sonar direction, thereby improving sonar efficiency.

[0057] In this embodiment, the buoyancy adjustment cavity 103 is located in the space near the top inside the sonar bounce device body 101. With the above structure, while adjusting the overall density of the sonar bounce device body 101, it can further ensure that the sonar bounce device body 101 always floats above the dynamic cable 4 under the action of the positioning component and its own buoyancy. It will not tilt or invert in the water due to the lower center of gravity, thus avoiding the obstruction of the floating cable 4 by the sonar bounce device body 101, which would affect the reception and bounce of sound waves.

[0058] After the dynamic cable 4 is laid in seawater, to prevent seawater pressure from damaging the sonar bounce device body 101, in a preferred embodiment, the buoyancy adjustment cavity 103 is also provided with a pressure adjustment device 106. The pressure adjustment device 106 can adjust the air pressure inside the buoyancy adjustment cavity according to the depth of the sonar bounce device body. Specifically, the pressure adjustment device 106 can be designed with the following structure: it includes a cylinder and a piston; one end of the cylinder is connected to the buoyancy adjustment cavity 106, and the piston is fitted inside the cylinder sleeve at the other end; a limiting protective cap is provided at the end of the piston away from the cylinder sleeve, and the diameter of the limiting protective cap is larger than the diameter of the cylinder sleeve. During construction, the piston is inserted into the cylinder, sealing the buoyancy adjustment chamber 103. The sonar rebound device 101 sinks into the seawater along with the dynamic cable 4. As the seawater depth increases, the seawater pressure also increases, compressing the piston and causing it to move into the cylinder. This piston movement increases the air pressure inside the buoyancy adjustment chamber 103, achieving a balance with the seawater pressure and preventing water pressure from damaging the sonar rebound device 101. The design of the limit cap prevents the piston from being forced into the buoyancy adjustment chamber 103 by water pressure, which would allow seawater to enter and cause the buoyancy adjustment chamber 103 to lose buoyancy and fail to perform its buoyancy adjustment function.

[0059] The buoyancy adjustment cavity 103 described above is only a preferred embodiment. Other general methods can also be used to adjust the buoyancy of the sonar bounce device body 101, which will not be elaborated here.

[0060] In a preferred embodiment, the plurality of sonar reflectors include two types: a first sonar reflector 1 and a second sonar reflector 1'. The sonar reflector surface 102 of the second sonar reflector 1' has a higher material hardness and density than that of the first sonar reflector 1'. The second sonar reflector 1' is located at a critical location on the dynamic cable 4, while the first sonar reflector 1 is located at other locations on the dynamic cable 4. Because the sonar reflector surface 102 of the second sonar reflector 1' has a higher material hardness and density than that of the first sonar reflector 1', the sound wave reflection signal of the second sonar reflector 1' is stronger than that of the first sonar reflector 1. This distinguishes the reflection signal at the critical location of the dynamic cable 4 from the reflection signals at other locations, thus facilitating the acquisition of the reflection signal from the critical location by the sonar and improving the accuracy of the critical location's shape. The critical location of the dynamic cable can be the joint of the dynamic cable, the installation location of the sensor, etc. The specific location is determined according to actual needs, and this embodiment does not limit it.

[0061] Based on the aforementioned offshore wind power dynamic cable monitoring device, the present invention also provides an offshore wind power dynamic cable monitoring method, specifically comprising: transmitting sound waves of a specific frequency through a transmitting device of a sonar 5 installed on the underwater portion of the offshore wind power floating foundation platform 3; receiving sound waves reflected by a plurality of sonar reflectors spaced apart on the dynamic cable 4 through a receiving device of the sonar 5; and calculating the real-time morphology of the dynamic cable 4 based on the parameters of the sound waves transmitted by the transmitting device, the parameters of the reflected sound waves received by the receiving device, and hydrological parameters.

[0062] The hydrological parameters include: seawater density and temperature; the transmitted sound wave parameters include: the time it takes for the transmitting device to emit sound waves of a specific frequency. The received sound wave parameters include: the time it takes for the receiving device to receive the reflected sound wave. And angle; after obtaining the above parameters, the real-time shape of the dynamic cable can be calculated based on the above hydrological parameters, transmitted sound wave parameters, and received sound wave parameters. The specific calculation formula is:

[0063]

[0064]

[0065]

[0066] Where (X, Y, Z) are the coordinates of the sonar bounce device. , , These are the angles of the reflected sound waves on the corresponding coordinate axes. The Perkins coefficient for seawater. Let be the viscosity coefficient of seawater. is the specific volume coefficient of seawater. is the specific saturation coefficient of seawater. This is the density of seawater.

[0067] The Perkins coefficient, viscosity coefficient, specific volume coefficient, and specific saturation coefficient of the seawater mentioned above can all be obtained by instrument detection or calculation, which are existing technologies in this field and will not be elaborated here.

[0068] By using sonar installed on the underwater portion of the offshore wind power floating foundation platform 3 and multiple sonar bounce devices spaced apart on the dynamic cable 4, the shape of the dynamic cable 4 in the sea can be obtained in real time. This allows for fatigue analysis of the dynamic cable 4, providing strong support for preventing failures of the dynamic cable 4.

[0069] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0070] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from the scope of the invention.

[0071] The spirit and scope of the invention are as follows: Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A dynamic cable monitoring device for offshore wind power, characterized in that, include: Sonar and multiple sonar bounce devices; The sonar is installed on the underwater portion of the offshore wind power floating foundation platform. The multiple sonar bounce devices are spaced apart on the dynamic cable; The sonar bounce device is suspended and mounted on the upper part of the dynamic cable; The sonar bounce device includes a positioning component and a sonar bounce device body; One side of the sonar bounce device body is provided with a sonar bounce surface, the upper part of the sonar bounce device body is provided with a buoyancy adjustment cavity, and the lower part of the sonar bounce device body is fixedly provided with a movable connecting piece. One end of the positioning component is connected to the movable connector of the sonar bounce device body, and the other end is connected to the dynamic cable, which is used to control the position and bounce direction of the sonar bounce device body. The positioning component includes a socket, a limiting connector, and a closing component; The socket is used to attach the positioning member to the armor of the dynamic cable; The limiting connector is used to connect the movable connector of the sonar bounce device body and to control the bounce direction of the sonar bounce device body; The closure is used to close the socket; The limiting connector includes two parallel connecting plates, one end of which is fixedly connected to the sleeve, and the other end is provided with a first shaft hole. The movable connector is plate-shaped, with one end fixedly connected to the bottom of the sonar bounce device body and the other end having a second shaft hole. The movable connector is inserted between the two parallel connecting plates, and the first shaft hole and the second shaft hole are connected by a shaft pin. The movable connector rotates along the shaft pin.

2. The offshore wind power dynamic cable monitoring device according to claim 1, characterized in that, The plurality of sonar bounce devices include a first sonar bounce device and a second sonar bounce device. The hardness and density of the sonar reflector surface of the second sonar reflector are greater than those of the sonar reflector surface of the first sonar reflector. The second sonar bounce device is installed at a key location on the dynamic cable, while the first sonar bounce device is installed at other locations on the dynamic cable.

3. The offshore wind power dynamic cable monitoring device according to claim 2, characterized in that, The sonar reflector surface is an arc surface that is concave to the body of the sonar reflector device; The material hardness and density of the sonar reflector surface are greater than those of the rest of the sonar reflector body.

4. The offshore wind power dynamic cable monitoring device according to claim 2, characterized in that, The buoyancy adjustment cavity is located in the space near the top inside the body of the sonar bounce device. The buoyancy adjustment cavity is equipped with a pressure adjustment device, which is used to adjust the air pressure inside the buoyancy adjustment cavity according to the depth of the body of the sonar bounce device. The pressure regulating device includes a cylinder and a piston; One end of the cylinder is connected to the buoyancy adjustment chamber, and the piston is fitted inside the cylinder liner at the other end; The piston is provided with a limiting protection cap at the end away from the cylinder liner, and the diameter of the limiting protection cap is larger than the diameter of the cylinder liner.

5. A method for monitoring dynamic cables of offshore wind power, based on the offshore wind power dynamic cable monitoring device according to claim 1, characterized in that... ； Sound waves of a specific frequency are emitted by the sonar transmitting device installed on the underwater part of the offshore wind turbine floating foundation platform. The sonar receiving device receives the reflected sound waves from multiple sonar reflectors spaced apart on the dynamic cable. The real-time morphology of the dynamic cable is calculated based on the parameters of the sound waves transmitted by the transmitting device, the parameters of the reflected sound waves received by the receiving device, and the hydrological parameters.

6. The method for monitoring dynamic cables in offshore wind power according to claim 5, characterized in that: The real-time morphology of the dynamic cable is calculated based on the parameters of the sound wave transmitted by the transmitting device, the parameters of the reflected sound wave received by the receiving device, and hydrological parameters, including: Obtain hydrological parameters, including seawater density and temperature; Acquiring the parameters of the transmitted sound wave, including: the time during which the transmitting device transmits a sound wave of a specific frequency; Acquiring the parameters of the received sound wave includes: the time and angle at which the receiving device receives the reflected sound wave; The real-time morphology of the dynamic cable is calculated based on the hydrological parameters, transmitted acoustic parameters, and received acoustic parameters.

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