Deepwater pressure-resistant large shell structure deformation monitoring method and system

Abstract

The invention discloses a deformation monitoring method and system for a deepwater pressure-resistant large shell structure, and relates to the technical field of deformation monitoring of the deepwater pressure-resistant large shell structure, and the method comprises the steps: arranging measuring points on the deepwater pressure-resistant large shell structure, drawing an outer contour through the arranged measuring points, setting an encrypted measuring point between the two measuring points, and carrying out the correction, and monitoring the deformation condition of the large shell structure according to the corrected result. According to the invention, monitoring of continuous deformation on a certain section of a large pressure-resistant shell structure can be realized through a few discrete strain data, and defects and easy failure points can be effectively found; an important monitoring medium is provided for deformation monitoring, and structural deformation monitoring and early warning are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of deformation monitoring of a large deepwater pressure-resistant hull structure, and in particular to a deformation monitoring method and system for a large deepwater pressure-resistant hull structure. Background Art

[0002] At present, more and more deep-sea exploration and development equipment are being proposed and applied, such as underwater detectors, submarines, deep-sea space stations and submarine data centers. Its main types are spherical, cylindrical, etc., relying on the strength of the material and reasonable structure to resist external water pressure. The geometric shape design and shape / deformation detection of the shell are key links. Whether in the design stage or the operation stage, its geometric shape needs to be accurately calculated or detected, otherwise it will be damaged due to excessive local stress due to shape problems. Under long-term underwater operation conditions, seawater continues to corrode and erode, the impact of unknown physical objects carried by the current, or collisions with dark objects such as reefs on the seabed, occasionally causing the pressure shell to weaken, dent or crack, thus generating local high stress and becoming a stress concentration point. Especially in the high temperature, high pressure and high salt environment of the deep sea, the shell is deformed or even ruptured, destroying its overall pressure resistance performance. In the subsequent use process, even normal water pressure may cause the damaged shell to collapse. Therefore, monitoring and regulating the geometric shape and real-time deformation of the deep-water pressure-resistant large shell structure is crucial to ensure the safe operation of the entire shell structure. For example, the main reasons for the collapse of the Titan submersible implosion in June 2023 were material and strength, fatigue damage and structural failure. The laying method of the thin-walled cylindrical structure caused the structure to change from a circular cross-section to an oblate circle when subjected to non-uniform force. The delamination defects expanded more significantly under the action of torque loads, and local buckling was more likely to occur, leading to the destruction of the entire structure. In summary, the research on deformation monitoring and deformation visualization technology of deep-water pressure-resistant large-scale shell structures has great engineering value for early warning of structures and avoiding major disasters.

[0003] The invention patent [202010609994.2] discloses a transformer winding deformation monitoring method and monitoring system: it obtains an impedance error value based on the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers and the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers; based on the impedance error value, the winding deformation status of the two main transformers is obtained.

[0004] The invention patent [202211668718.9] discloses an automatic deformation monitoring method and system based on dynamic wireless microwaves: by obtaining the microwave signal received by the point to be measured, the microwave signal received by the reference point and the initial position information of the point, and by calculating the position information of the point to be measured and the initial position information of the point, the deformation result is obtained.

[0005] The invention patent [202210436021.2] discloses a structural interlayer deformation monitoring device and method based on data fusion: IMUs are respectively arranged on the ceiling and floor of the floors to be monitored for interlayer deformation in the building, a camera is installed on the ceiling through a rigid camera bracket, and a tracking target is arranged on the floor and is always within the shooting range of the camera.

[0006] In the prior art: Invention patent [202010609994.2] does not involve deformation detection of structures in deep-water environments; Invention patent [202211668718.9] has the effect of reducing the difficulty of measurement, but the detection scheme based on the microwave principle cannot be applied to deep-sea environments, and has disadvantages such as short transmission distance and easy scattering; Invention patent [202210436021.2] makes up for the shortcomings of single measurement methods such as visual recognition and acceleration vibration monitoring, realizes the complementarity of the two measurements, and improves monitoring accuracy, but its visual recognition cannot be applied to dark conditions in deep-water environments, and it requires fixed points and cannot be applied to underwater mobile monitoring equipment.

[0007] Therefore, it is necessary to propose a deformation monitoring method and a deformation visualization scheme for large shell structures under deepwater high-pressure environments to solve the problems mentioned in the prior art. Summary of the invention

[0008] In order to solve the above problems, the purpose of the present invention is to provide a deformation monitoring technology for deep-water pressure-resistant large-scale hull structures, aiming to solve the problem of lack of micro-deformation monitoring technology for large-scale hull structures under deep-water environment and high water pressure conditions.

[0009] In order to achieve the above technical objectives, the present application provides a method for monitoring deformation of a deepwater pressure-resistant large-scale hull structure, comprising the following steps:

[0010] Screen typical failure sections of deepwater pressure-resistant large hull structures, arrange measuring points, and obtain radial strains at the measuring points;

[0011] According to the position information of the measuring points, a circular curve is drawn with the center of the shell structure as the circle point and the measuring point position as the radius. The inscribed arcs of the two circles passing through the two measuring points are drawn between the two connected circles to synthesize the deformation curve. The deformation curve is corrected by setting encrypted measuring points between the two measuring points. The deformation of the large shell structure is monitored according to the corrected deformation curve.

[0012] Preferably, in the process of arranging the measuring points, based on the typical failure cross section of the deep-water pressure-resistant large-scale hull structure, four fiber Bragg grating strain sensors are arranged at 90° intervals as four measuring points.

[0013] Preferably, in the process of acquiring the radial line strain, the radial line strain is acquired according to the radial displacement of the radial line segment.

[0014] Preferably, in the process of obtaining the radial strain, the deformation amount of the measuring point is obtained according to the outer diameter of the shell structure.

[0015] Preferably, in the process of monitoring the deformation of a large shell structure, a new encrypted point is added between every two measuring points, and the deformation of the shell structure is monitored by drawing a deformation curve based on the measuring points and the encrypted points.

[0016] Preferably, in the process of drawing the deformation curve according to the measuring points and the encrypted measuring points, the encrypted measuring point deformation is located on the outer contour of the measuring point deformation, and the original deformation graph does not need to be adjusted.

[0017] Preferably, in the process of drawing the deformation curve according to the measuring points and the encrypted measuring points,

[0018] When the encrypted measuring point deformation is located within the outer contour of the measuring point deformation, a circular curve is drawn with the distance from the center of the device after the encrypted measuring point deformation as the radius, and a circular curve is drawn with the distance from the center of the device after the encrypted measuring point deformation as the radius to draw the deformation diagram between the encrypted measuring point and the measuring point

[0019] When the encrypted measuring point deformation is outside the outer contour of the measuring point deformation, the process is opposite to that when the encrypted measuring point deformation is inside the outer contour of the measuring point deformation.

[0020] The present invention discloses a deformation monitoring system for a deepwater pressure-resistant large-scale hull structure, which is used to implement the above-mentioned deformation monitoring method for a deepwater pressure-resistant large-scale hull structure, comprising:

[0021] The data acquisition module realizes real-time strain monitoring and acquisition at the structural strain measurement point by arranging fiber Bragg grating strain sensors;

[0022] The data processing module selects typical failure sections of deepwater pressure-resistant large-scale shell structures and obtains radial strains of the measuring points according to the measuring points;

[0023] The monitoring module is used to draw a circular curve with the center of the shell structure as the circle point and the measuring point position as the radius according to the position information of the measuring point, and to draw the inner and outer tangent arcs of the two circles passing through the two measuring points between the two connected circles to synthesize the deformation curve to monitor the deformation of the large shell structure.

[0024] The present invention discloses the following technical effects:

[0025] The present invention can monitor the continuous deformation of a certain cross section of a large pressure-resistant shell structure through a few discrete strain data, and can effectively find defects and failure points.

[0026] The present invention innovates a scheme of drawing the outer contour line of the overall deformation through discrete deformation, which can provide an important monitoring medium for deformation monitoring and realize structural deformation monitoring and early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a sensor arrangement position diagram of the present invention;

[0029] Figure 2 It is the calculation of the deformation amount and deformation diagram of the round tube described in the present invention;

[0030] Figure 3 It is a deformation diagram synthesized by measuring point 1 and measuring point 2 according to the present invention;

[0031] Figure 4 It is the deformation diagram synthesized by measuring point 2 and measuring point 3 according to the present invention;

[0032] Figure 5 It is a deformation diagram synthesized by measuring point 3 and measuring point 4 according to the present invention;

[0033] Figure 6 It is a deformation diagram synthesized by measuring point 4 and measuring point 1 according to the present invention;

[0034] Figure 7 It is the deformation diagram synthesized from measuring point 1 to measuring point 4 according to the present invention;

[0035] Figure 8 The encrypted measuring point deformation of the present invention is located on the original deformation diagram of the outer contour of the four measuring points deformation;

[0036] Fig. 9 is a deformation diagram of measuring point 1 to measuring point 41 of the present invention, wherein (a) represents the process of drawing a circle, and (b) represents the deformation diagram of measuring point 1 to measuring point 41 drawn;

[0037] Fig.10 It is the deformation diagram of measuring point 1-measuring point 41-measuring point 4 of the present invention, wherein (a) represents drawing the deformation of measuring point 41-measuring point 4, and (b) represents drawing the deformation of measuring point 1-measuring point 4;

[0038] Fig.11 It is a schematic diagram of the method flow of the present invention. DETAILED DESCRIPTION

[0039] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0040] like Figure 1-11 As shown, the present invention provides a deformation monitoring technology for a deep-water pressure-resistant large-scale shell structure, including the following contents:

[0041] The typical failure section of a large deepwater pressure-resistant shell structure was selected, and four fiber Bragg grating strain sensors were arranged at 90° intervals along the circumferential direction inside the shell to collect radial strains at four measuring points of the structure in real time;

[0042] The outer diameter of the shell structure at the above four measuring points is calculated according to the radial strain-radial displacement calculation formula;

[0043] d 21 =ε 21 d+dd 22 =ε 22 d+dd 23 =ε 23 d+dd 24 =ε 24 d+d;

[0044] Calculate the deformation at the four measuring points;

[0045] Δr 21 =(d 21 -d) / 2 Δr 22 =(d 22 -d) / 2 Δr 23 =(d 23 -d) / 2 Δr 24 =(d 24 -d) / 2;

[0046] Calculate the position information of the four measuring points after the shell structure is deformed, draw circular curves with the center of the shell structure as the circle point and the positions of the four measuring points as the radius, and draw the inner and outer tangent arcs of the two circles passing through the two measuring points between the two connected circles;

[0047] Specifically, firstly, a circular curve is drawn at the position of the first measuring point, and a circular curve is drawn at the position of the second measuring point; an inscribed arc between the first circle and the second circle passing through the two measuring points is drawn to obtain the first section shell structure deformation curve; similarly, the second section, the third section and the fourth section shell structure deformation curves are drawn;

[0048] The deformation monitoring of large shell structures is obtained by synthesizing four deformation curves;

[0049] Considering the need for accurate inversion of micro-deformation, four new measuring points are added on the basis of the deformation maps of the four measuring points, and are evenly interpolated between measuring points 1-2, 2-3, 3-4 and 4-1, forming eight fiber Bragg grating sensor measuring points evenly arranged at annular intervals of 45°. The position deformation of the four new measuring points is calculated and the corresponding deformation maps are drawn.

[0050] Take the encrypted point 41 between point 4 and point 1 as an example, and explain it in three specific cases:

[0051] (1) The deformation of the encrypted measuring point is located on the outer contour of the deformation of the four measuring points, and the original deformation map does not need to be adjusted;

[0052] (2) The deformation of the encrypted measuring point is located within the outer contour of the deformation of the four measuring points

[0053] A circular curve (yellow) is drawn with the distance from the center of the device after the deformation of the encrypted measuring point 41 as the radius, and a circular curve (blue) is drawn with the distance from the center of the device after the deformation of the measuring point 1 as the radius. The circumscribed line of circle 41 and the inscribed line of circle 1 are further drawn, which is the deformation diagram of measuring point 1-measuring point 41 (indicated by the gray arrow);

[0054] Similarly, draw the deformation diagram of measuring point 41-measuring point 4, and get the deformation diagram of measuring point 1-measuring point 41-measuring point 4

[0055] (3) The deformation of the encrypted measuring point is located outside the outer contour of the four measuring points

[0056] When it is outside the contour, it is the opposite of (2) and will not be described here.

[0057] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0058] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0059] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for monitoring deformation of a deepwater pressure-resistant large-scale hull structure, characterized in that: The following steps are involved: Screen typical failure sections of deepwater pressure-resistant large hull structures, arrange measuring points, and obtain radial strains at the measuring points; According to the position information of the measuring points, a circular curve is drawn with the center of the shell structure as the circle point and the measuring point position as the radius. The inscribed arcs of the two circles passing through the two measuring points are drawn between the two connected circles to synthesize the deformation curve. The deformation curve is corrected by setting encrypted measuring points between the two measuring points. The deformation of the large shell structure is monitored according to the corrected deformation curve.

2. According to claim 1, a method for monitoring deformation of a large deepwater pressure-resistant hull structure is characterized by: In the process of arranging the measuring points, based on the typical failure section of the deep-water pressure-resistant large-scale hull structure, four fiber Bragg grating strain sensors are arranged at 90° intervals as four measuring points.

3. According to claim 2, a method for monitoring deformation of a large deepwater pressure-resistant hull structure is characterized by: In the process of acquiring the radial line strain, the radial line strain is acquired according to the radial displacement of the radial line segment.

4. A method for monitoring deformation of a deepwater pressure-resistant large-scale hull structure according to claim 3, characterized in that: In the process of obtaining radial strain, the deformation of the measuring point is obtained according to the outer diameter of the shell structure.

5. A method for monitoring deformation of a deepwater pressure-resistant large-scale hull structure according to claim 4, characterized in that: In the process of monitoring the deformation of large shell structures, a new encrypted point is added between every two measuring points. The deformation curve is drawn based on the measuring points and the encrypted points to monitor the deformation of the shell structure.

6. A method for monitoring deformation of a deepwater pressure-resistant large-scale hull structure according to claim 5, characterized in that: In the process of drawing deformation curves based on measuring points and encrypted measuring points, the encrypted measuring point deformation is located on the outer contour of the measuring point deformation, and the original deformation diagram does not need to be adjusted.

7. A method for monitoring deformation of a deepwater pressure-resistant large-scale hull structure according to claim 6, characterized in that: In the process of drawing deformation curves based on measuring points and encrypted measuring points, When the encrypted measuring point deformation is located within the outer contour of the measuring point deformation, a circular curve is drawn with the distance from the center of the device after the encrypted measuring point deformation as the radius, and a circular curve is drawn with the distance from the center of the device after the encrypted measuring point deformation as the radius to draw the deformation diagram between the encrypted measuring point and the measuring point When the encrypted measuring point deformation is outside the outer contour of the measuring point deformation, the process is opposite to that when the encrypted measuring point deformation is inside the outer contour of the measuring point deformation.

8. A deepwater pressure-resistant large-scale hull structure deformation monitoring system, used to implement a deepwater pressure-resistant large-scale hull structure deformation monitoring method as claimed in any one of claims 1 to 7, characterized in that: include: The data acquisition module realizes real-time strain monitoring and acquisition at the structural strain measurement point by arranging fiber Bragg grating strain sensors; The data processing module selects typical failure sections of deepwater pressure-resistant large-scale shell structures and obtains radial strains of the measuring points according to the measuring points; The monitoring module is used to draw a circular curve with the center of the shell structure as the circle point and the measuring point position as the radius according to the position information of the measuring point, and to draw the inner and outer tangent arcs of the two circles passing through the two measuring points between the two connected circles to synthesize the deformation curve to monitor the deformation of the large shell structure.

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