Monitoring method for identifying suction type foundation motion mode based on parametric modeling

Abstract

The monitoring method for recognizing the motion mode of the suction type foundation based on parametric modeling comprises the following steps that a test appliance is configured according to a similarity criterion, an experiment seabed is prepared, and the suction type foundation is sunk to a preset position; displacement sensing devices are respectively arranged at two different horizontal heights and in one vertical direction of the suction type foundation, and a data acquisition system is arranged; a horizontal load is applied to the suction type foundation, and monitoring data of all the displacement sensing devices are collected in real time through a data collection system; establishing a parameter coordinate system based on rigid body motion assumption, and calculating a rotation angle and a rotation center parameter of the suction foundation by using monitoring data; and drawing a motion curve according to the rotation angle and the rotation center parameter, and analyzing a motion trend to identify a motion mode of the suction type foundation. The monitoring method provided by the invention can realize the research on the motion mode characteristics of the suction type foundation through tests.

Description

Technical Field

[0001] This invention belongs to the technical field of offshore wind power monitoring, and specifically relates to a monitoring method for identifying the motion patterns of suction-type foundations based on parametric modeling. Background Technology

[0002] Suction foundations have been widely used in offshore wind farm projects in recent years due to their significant advantages, such as low steel consumption, convenient installation and transportation, and short construction period. Unlike onshore environments, suction foundations in marine environments must continuously withstand huge horizontal loads, which can easily lead to complex motion responses. In extreme cases, they may overturn and become unstable, resulting in serious engineering accidents. Therefore, understanding the motion mode characteristics of suction foundations during the design phase is a key prerequisite for ensuring project safety.

[0003] Currently, experimental research is the primary means of exploring the ultimate horizontal force motion modes of suction foundations. While field tests can reflect real working conditions, they suffer from high costs, operational difficulties, and strong interference from marine environmental factors, making widespread implementation challenging. Laboratory model tests, on the other hand, have become a core reference method in the engineering design and demonstration phase due to their controllable costs and high repeatability. However, existing laboratory monitoring methods still have significant shortcomings: some methods rely on complex monitoring equipment and cumbersome operating procedures, resulting in high testing costs; others struggle to effectively distinguish different motion modes of the foundation under load, failing to provide reliable preliminary data for subsequent ultimate bearing capacity analysis, severely limiting their application value in engineering design. Summary of the Invention

[0004] This invention provides a monitoring method for identifying the motion patterns of suction foundations based on parametric modeling, in order to solve the problem of studying the motion pattern characteristics of suction foundations under extreme loading conditions.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The monitoring method for identifying suction-based basic motion patterns based on parametric modeling includes the following steps: Step 1: Configure the experimental equipment and prepare the experimental seabed according to the similarity criteria, and sink the suction foundation to the preset position; Step 2: Install displacement sensing devices at two different horizontal heights and one vertical direction on the suction foundation, and equip them with a data acquisition system; Step 3: Apply a horizontal load to the suction foundation and collect monitoring data from each displacement sensor in real time through the data acquisition system; Step 4: Establish a parametric coordinate system based on the assumption of rigid body motion, and use monitoring data to calculate the rotation angle and rotation center parameters of the suction foundation; Step 5: Draw motion curves based on the rotation angle and rotation center parameters, and analyze the motion trend to identify the motion pattern of the suction foundation.

[0006] Furthermore, in step two, before arranging the displacement sensing device, the following steps are also included: determining the ultimate load direction of the suction foundation through a pre-wave test, water flow test, or wave-current coupling test, and arranging the displacement sensing device along the ultimate load direction.

[0007] Furthermore, the preliminary test is a unidirectional flow or circulating flow test, and the direction of the maximum topographic change or maximum load of the suction foundation is determined by a terrain monitoring device or wave flow loading device, and this direction is taken as the ultimate load direction.

[0008] Furthermore, in step three, when applying a horizontal load to the suction foundation, the plane of application of the horizontal load is consistent with the monitoring plane of the displacement sensing device.

[0009] Furthermore, in step three, a horizontal load is applied using an electric actuator loading system or a motor servo loading system to simulate static or dynamic loads.

[0010] Furthermore, in step four, when calculating using monitoring data, the rotation angle and rotation center parameters are calculated based on the monitoring data of the two horizontal displacement sensors, the arrangement height parameters of the two horizontal displacement sensors, and the distance parameters between the vertical displacement sensor and the center axis of the suction foundation.

[0011] Furthermore, in step four, it is assumed that the suction foundation undergoes pure rotational displacement under load, and the parametric coordinate system takes the intersection point A of the seabed mud surface and the central axis of the suction foundation as its origin. O The point is the center of rotation. O The horizontal coordinate of the point is x o Depth is y o ; The measured parameter horizontal displacement obtained by the displacement sensing device u 1. u 2. Known parameters h 1. h 2. l The rotation angle of the suction foundation can be calculated. θ , h 1 and h 2 represents the arrangement height of the two displacement sensors relative to the mud surface; l The distance between the vertically arranged displacement sensor and the centerline of the suction foundation; After the suction foundation rotates under load, it intersects its original position at points B, F, E, and C respectively; the origin A after rotation becomes A', and the displacements are respectively... xA , y A Calculate the length of segment AB respectively. d AB FA segment length d FA FB segment length d FB Length of segment A'B d A’B ; The horizontal displacement of point A on the central axis was calculated. x A Vertical displacement y A ; Calculate the x and y coordinates of the rotation center of the suction foundation. x o 、y o .

[0012] Furthermore, the suction foundation is considered as a rigid body in motion, and the motion of any point within the structure can represent the overall motion of the structure. The overall motion trend of the suction foundation can be preliminarily determined through the motion curve of point A.

[0013] Furthermore, in step five, the specific method for identifying the motion pattern is as follows: if the calculated rotation center depth parameter is positive, it is determined that the suction foundation only undergoes rotational displacement; if the rotation center depth parameter is negative or does not exist, it is determined that the suction foundation undergoes both rotational and translational displacement.

[0014] Furthermore, in step one, the suction foundation is driven to the point where its top surface is flush with the seabed mud surface; in step two, the data acquisition system includes a computer with storage function, a storage medium, and a digital display device with storage and display functions.

[0015] The present invention can achieve the following beneficial effects: 1. In the monitoring method of this application, after the suction foundation penetrates the seabed, displacement sensing devices are arranged at two different horizontal heights of the suction foundation, and a displacement sensing device is arranged at a certain vertical distance from the suction foundation. Displacement data is collected as the load is applied. The displacement variable parameters of the three sensing devices can be used to obtain the displacement and rotation angle of the suction foundation after being subjected to force. Further parametric calculations can be used to obtain the motion of the rotation center of the suction foundation, thereby revealing the passive and active earth pressure zones experienced by the suction foundation after it penetrates the seabed, providing a reference for subsequent suction foundation bearing capacity analysis. This monitoring method is simple to operate and has high repeatability; only a small number of displacement detection devices are needed to acquire data during the test. Through parametric modeling and calculation, real-time motion parameters of the suction foundation can be obtained, and motion patterns can be identified, significantly reducing costs; it can adapt well to various test environments, thus providing data support in the engineering design and demonstration stage.

[0016] 2. Pre-testing: Wave and flow correlation tests in the form of unidirectional or circulating flow can accurately locate the key load direction of suction foundations, avoid invalid data collection, and improve test efficiency.

[0017] 3. By identifying the sign and existence of the rotation center depth parameter, the motion modes of suction foundations, such as pure rotation and rotation plus translation, can be clearly distinguished, solving the problem of ambiguous motion mode identification in existing methods. At the same time, the design of the load application and monitoring plane being coplanar, combined with loading systems such as electric push rods and motor servos, can flexibly simulate static or dynamic loads, adapting to different test environments such as waves and water flow, providing comprehensive data support for the design and demonstration of various offshore wind farm projects, and covering a variety of marine working conditions. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a flowchart of the monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to the present invention; Figure 2 This is a layout diagram of the displacement monitoring system for the suction-type basic motion mode of the present invention; Figure 3 This is a schematic diagram of the suction-type foundation of the present invention after rotation; Figure 4 for Figure 3 A magnified view of a portion of the image. Detailed Implementation

[0019] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0020] Monitoring methods based on parametric modeling to identify basic suction motion patterns, such as... Figure 1 As shown, it includes the following steps: Step 1: Based on similarity criteria, configure the experimental equipment and prepare the experimental seabed according to a specific scale, and sink the suction foundation to the preset position.

[0021] like Figure 2 As shown, the suction foundation is based on the structure of the engineering site example and is made of steel; the suction foundation sinks to the point where the top surface is flush with the seabed mud surface.

[0022] Step 2: Install displacement sensing devices at two different horizontal heights and one vertical direction on the suction foundation, and equip them with a data acquisition system.

[0023] like Figure 2 and Figure 3 As shown, displacement sensors 2 and 3 are arranged at two different horizontal heights, and displacement sensing device 4 is arranged vertically, equipped with a data acquisition system. Displacement sensor 2 is horizontally positioned above the mud surface. h 1. The measured value is u 1. Displacement sensor 3 is horizontally arranged above the mud surface. h At height 2, the measured value is u 2. The distance between displacement sensor 4 and the centerline of the suction foundation is... l The measured value is v .

[0024] The arrangement can be based on a preliminary wave experiment, a water flow experiment, or a wave-current coupling experiment. The preliminary experiment is a unidirectional flow or a circulating flow. The preliminary experiment uses a terrain monitoring device or a wave-current loading device to determine the direction of the maximum terrain change or the maximum load, and determines that this direction is the ultimate load direction. Displacement sensors are then placed in this direction to collect data.

[0025] The displacement sensing device is an infrared laser, capacitive, or inductive displacement sensor, requiring an accuracy of millimeters or higher. The data acquisition system includes a computer with storage capabilities, storage media, and a digital display device with storage and display functions.

[0026] Step 3: Apply a horizontal load to the suction foundation and collect monitoring data from each displacement sensor in real time through the data acquisition system.

[0027] Considering the ultimate bearing characteristics of suction foundations, when applying horizontal loads to suction foundations, the application plane of the horizontal load and the monitoring plane of the displacement sensing device must be on the same plane. The horizontal load application device can be an electric actuator loading system or a motor servo loading system to simulate static or dynamic loads.

[0028] Step 4: Establish a parametric coordinate system based on the rigid body motion assumption, and calculate the rotation angle and rotation center parameters of the suction foundation using monitoring data. When calculating using monitoring data, the rotation angle and rotation center parameters are calculated based on the monitoring data from the two horizontal displacement sensors, the arrangement height parameters of the two horizontal displacement sensors, and the distance parameters between the vertical displacement sensor and the central axis of the suction foundation.

[0029] Since the elastic modulus of suction foundations is much greater than that of sandy seabed, their motion can be regarded as rigid body motion, that is, the motion of any point within the structure can represent the overall motion of the structure.

[0030] Establish a parametric coordinate system for the layout diagram of the suction foundation displacement monitoring system, such as... Figure 3 and Figure 4As shown, before parametric calculation, it is assumed that the suction foundation undergoes pure rotational displacement under load; the origin of the coordinate system is the intersection point A of the mud surface and the central axis of the suction foundation. O Point is the center of rotation, and its horizontal distance is x o Depth is y o .

[0031] Furthermore, the horizontal displacement is measured by the parameter. u 1. u 2. Known parameters h 1. h 2. l The rotation angle of the suction foundation can be calculated. θ : ; ; Furthermore, after the suction foundation rotates under load, it intersects its original position at points B, F, E, and C respectively; the origin A after rotation becomes A', and the displacements are respectively... x A , y A Calculate the length of segment AB respectively. d AB FA segment length d FA FB segment length d FB Length of segment A'B d A’B : ; ; ; ; Furthermore, the horizontal displacement of point A on the central axis was calculated. x A Vertical displacement y A : ; ; Furthermore, the horizontal and vertical coordinates of the rotation center of the suction-type foundation x o 、y o It can be calculated that: ; ; Step 5: Draw motion curves based on the rotation angle and rotation center parameters, and analyze the motion trend to identify the motion pattern of the suction foundation.

[0032] By processing the displacement monitoring data in step four, several sets of motion data of the intersection point A of the central axis and the rotation center of the suction foundation are obtained. Curves are plotted to analyze the motion trend and determine the motion mode of the suction foundation.

[0033] Specifically, when a suction foundation undergoes rigid body motion, the intersection point A of the central axis can represent the overall motion of the structure. The overall trend of the suction foundation can be preliminarily determined by the motion curve at point A.

[0034] Furthermore, the change in the depth of the rotation center of the suction foundation is analyzed to identify its motion mode. The method for determining the motion mode of the suction foundation is as follows: the depth of the rotation center of the suction foundation, represented by the parametric coordinate system, i.e., the vertical axis... y o It should be a positive value. This means that if the calculated value of the rotation point depth of the suction foundation under a certain load level is positive, then the assumption in step four is valid, and the suction foundation only undergoes rotational displacement. If the calculated rotation point depth is negative or does not exist, then it contradicts the assumption in step four, proving that the suction foundation also produces translational displacement under that load level.

[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A monitoring method for identifying suction-type basic motion patterns based on parametric modeling, characterized in that, Includes the following steps: Step 1: Configure the experimental equipment and prepare the experimental seabed according to the similarity criteria, and sink the suction foundation to the preset position; Step 2: Install displacement sensing devices at two different horizontal heights and one vertical direction on the suction foundation, and equip them with a data acquisition system; Step 3: Apply a horizontal load to the suction foundation and collect monitoring data from each displacement sensor in real time through the data acquisition system; Step 4: Establish a parametric coordinate system based on the assumption of rigid body motion, and use monitoring data to calculate the rotation angle and rotation center parameters of the suction foundation; Step 5: Draw motion curves based on the rotation angle and rotation center parameters, and analyze the motion trend to identify the motion pattern of the suction foundation.

2. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 1, characterized in that: In step two, before arranging the displacement sensing device, the following steps are also included: determining the ultimate load direction of the suction foundation through a pre-wave test, water flow test, or wave-current coupling test, and arranging the displacement sensing device along the ultimate load direction.

3. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 2, characterized in that: The preliminary test is a unidirectional flow or circulating flow test, and the direction of the maximum topographic change or maximum load of the suction foundation is determined by the terrain monitoring device or wave flow loading device, and this direction is taken as the ultimate load direction.

4. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 1, characterized in that: In step three, when applying a horizontal load to the suction foundation, the plane of application of the horizontal load is consistent with the monitoring plane of the displacement sensing device.

5. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 1, characterized in that: In step three, a horizontal load is applied using an electric actuator loading system or a motor servo loading system to simulate static or dynamic loads.

6. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 1, characterized in that: In step four, when calculating using monitoring data, the rotation angle and rotation center parameters are calculated based on the monitoring data of the two horizontal displacement sensors, the arrangement height parameters of the two horizontal displacement sensors, and the distance parameters between the vertical displacement sensor and the center axis of the suction foundation.

7. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 6, characterized in that: In step four, it is assumed that the suction foundation undergoes pure rotational displacement under load, and the parametric coordinate system takes the intersection point A of the seabed mud surface and the central axis of the suction foundation as its origin. O The point is the center of rotation. O The horizontal coordinate of the point is x o Depth is y o ; The measured parameter horizontal displacement obtained by the displacement sensing device u 1. u 2. Known parameters h 1. h 2. l The rotation angle of the suction foundation can be calculated. θ , h 1 and h 2 represents the arrangement height of the two displacement sensors relative to the mud surface; l The distance between the vertically arranged displacement sensor and the centerline of the suction foundation; After the suction foundation rotates under load, it intersects its original position at points B, F, E, and C respectively; the origin A after rotation becomes A', and the displacements are respectively... x A , y A Calculate the length of segment AB respectively. d AB FA segment length d FA FB segment length d FB Length of segment A'B d A’B ; The horizontal displacement of point A on the central axis was calculated. x A Vertical displacement y A ; Calculate the x and y coordinates of the rotation center of the suction foundation. x o 、y o .

8. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 7, characterized in that: The suction foundation is considered as a rigid body in motion, and the motion of any point within the structure can represent the overall motion of the structure. The overall motion trend of the suction foundation can be preliminarily determined by the motion curve of point A.

9. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 1, characterized in that: In step five, the specific method for identifying the motion pattern is as follows: if the calculated rotation center depth parameter is positive, it is determined that the suction foundation only undergoes rotational displacement; if the rotation center depth parameter is negative or does not exist, it is determined that the suction foundation undergoes both rotational and translational displacement.

10. The monitoring method for identifying suction-type basic motion patterns based on parametric modeling according to claim 1, characterized in that: In step one, the suction foundation is driven until its top surface is flush with the seabed mud surface; in step two, the data acquisition system includes a computer with storage function, storage medium, and digital display device with storage and display function.

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