A method and system for monitoring and early warning of the safety of a semi-submersible barge loading hull structure

Abstract

The application belongs to the technical field of ship, and particularly relates to a kind of semi-submersible barge loading ship body structure safety monitoring and early warning method and system, method includes the following steps: obtaining four-point plane distortion of semi-submersible barge loading ship body;According to four-point plane distortion, the maximum allowable value of four-point plane distortion is calculated;The maximum allowable value of four-point plane distortion is compared with the early warning threshold, and the early warning level of four-point plane distortion is obtained, and the early warning level reflects the safety level.The method of the application gives the stress and deformation of the semi-submersible barge loading ship body during loading, and gives an objective quantitative method.According to the quantitative result, the safety risk level of the semi-submersible barge loading ship body structure is judged.

Description

Technical Field

[0001] This invention relates to the field of marine technology, specifically to a monitoring and early warning method and system for the structural safety of a semi-submersible barge loading vessel. Background Technology

[0002] Currently, during the loading process of semi-submersible barges, the transport equipment is arranged on the barge with multiple supports. Factors such as asynchronous equipment operation, uneven ground, and the time required for the hydraulic system to adapt to deformation can cause changes in the stress and attitude of the semi-submersible barge structure, ultimately leading to the risk of structural damage. Damage to the hull structure has adverse effects on the semi-submersible barge, thereby affecting its structural safety and performance.

[0003] Currently, the key control parameters for semi-submersible barge loading construction are generally the vessel's draft, load capacity, and ballast tank water volume. While these parameters can indirectly reflect the stress and deformation of the semi-submersible barge, they cannot directly and effectively guide rapid decision-making for process adjustments when warnings occur, thus affecting construction progress. The core issue of structural safety for semi-submersible barge loading vessels is structural stress and deformation; controlling the impact of stress on the semi-submersible barge hull is crucial for its structural safety. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel, enabling the assessment of the structural safety risk level of the semi-submersible barge loading vessel and providing decision support for rapid process adjustments, thereby solving the problem of potential damage to the hull structure of the semi-submersible barge during loading.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] A method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel includes the following steps:

[0007] The method for obtaining the four-point planar torsion of the semi-submersible barge loading hull includes: obtaining the initial elevation values ​​of the four corner points before the transport equipment advances to the semi-submersible barge; obtaining the semi-submersible barge elevation values ​​at the four corner points after the transport equipment advances to the semi-submersible barge; and calculating the absolute value of the difference between the semi-submersible barge elevation values ​​at the four corner points and the initial elevation values. , , , The four-point plane twist degree is ;

[0008] Calculate the maximum allowable value of the four-point plane twist based on the four-point plane twist.

[0009] The maximum permissible value of the four-point plane distortion is compared with the warning threshold to obtain the warning level of the four-point plane distortion, and the warning level reflects the safety level.

[0010] As a preferred embodiment, the method further includes multiplying the maximum permissible value of the four-point plane distortion by a first reduction factor and then comparing it with the warning threshold to determine the warning level of the four-point plane distortion.

[0011] As a preferred embodiment, the value range of the first reduction coefficient is 0 to 1.

[0012] As a preferred embodiment, the method also includes obtaining a structural stress warning level based on structural stress, wherein the structural stress includes the stress value of the transport equipment support deck structure.

[0013] As a preferred option, the initial stress value of the transport equipment support deck structure in the initial state of the semi-submersible barge is calculated by using a finite element model. The maximum allowable change value of the support deck structure is obtained by subtracting the initial stress value from the stress value of the transport equipment support deck structure after the transport equipment has advanced to the semi-submersible barge. The structural stress warning level is obtained based on the maximum allowable change value of the support deck structure.

[0014] As a preferred option, the structural stress warning level is determined by multiplying the maximum permissible change value of the supporting deck structure by a second reduction factor.

[0015] As a preferred option, the value range of the second reduction coefficient is 0 to 1.

[0016] As a preferred embodiment, if the warning level of the four-point plane distortion is Level 1 or the structural stress warning level is Level 1, then the monitoring result is Level 1; if the warning level of the four-point plane distortion is Level 2 or the structural stress warning level is Level 2, then the monitoring result is Level 2; if the warning level of the four-point plane distortion is Level 3 or the structural stress warning level is Level 3, then the monitoring result is Level 3.

[0017] As a preferred option, it also includes making corresponding process adjustment measures based on monitoring results, including: at the first level of warning, the semi-submersible barge hull structure safety is at a medium risk level, monitoring changes in the four-point plane torsion or structural stress, without making any adjustments; at the second level of warning, the semi-submersible barge hull structure safety is at a high risk level, slowing down the operating speed of the transport equipment, and making dynamic adjustments to the process based on the four-point elevation values ​​and the four-point plane torsion values; at the third level of warning, the semi-submersible barge hull structure safety is at an extremely high risk level, stopping the operation of the transport equipment, and making process adjustments based on the four-point elevation values ​​and the four-point plane torsion values ​​until the structural safety level drops below the medium risk level.

[0018] Based on the same concept, a monitoring and early warning system for the structural safety of a semi-submersible barge loading vessel was also proposed, including displacement sensors, data acquisition instruments and processors;

[0019] The displacement sensor is used to obtain the initial elevation values ​​of the four corner points of the semi-submersible barge loading hull and the elevation values ​​of the semi-submersible barge. The initial elevation values ​​are the elevation values ​​of the four corner points before the transport equipment moves to the semi-submersible barge, and the elevation values ​​of the semi-submersible barge are the elevation values ​​of the four corner points after the transport equipment moves to the semi-submersible barge.

[0020] The data acquisition device is used to input the initial elevation values ​​of the four corner points and the semi-submersible barge elevation values ​​into the processor.

[0021] The processor calculates the four-point planar torsion of the semi-submersible barge loading hull. The method for obtaining the four-point planar torsion of the semi-submersible barge loading hull includes sequentially calculating the absolute value of the difference between the semi-submersible barge elevation value and the initial elevation value at each of the four corner points. , , , The four-point plane twist degree is The processor is further configured to compare the maximum allowable value of the four-point plane distortion calculated based on the four-point plane distortion with the warning threshold, obtain and output the warning level of the four-point plane distortion, and the warning level reflects the safety level.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The method of the present invention provides an objective quantitative method for the stress and deformation of the semi-submersible barge loading hull during the loading process, and gives an assessment of the structural safety risk level of the semi-submersible barge loading hull based on the quantitative results. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the semi-submersible barge hull structure;

[0024] Figure 2 This is a schematic diagram of the four-point planar torsion of a semi-submersible barge;

[0025] Figure 3 This is a schematic diagram of an SPMT vehicle transporting a wind power platform;

[0026] Figure 4 This is a schematic diagram of a safety monitoring and early warning system for the hull structure of a semi-submersible barge loading vessel;

[0027] Figure 5 This is a schematic diagram of the installation of a hydrostatic level.

[0028] Figure 6 This is a schematic diagram of the stress sensor installation. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0030] Example 1

[0031] A method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel includes the following steps:

[0032] The method for obtaining the four-point planar torsion of the semi-submersible barge loading hull includes: obtaining the initial elevation values ​​of the four corner points before the transport equipment advances to the semi-submersible barge; obtaining the semi-submersible barge elevation values ​​at the four corner points after the transport equipment advances to the semi-submersible barge; and sequentially calculating the absolute values ​​of the differences between the semi-submersible barge elevation values ​​at the four corner points and the initial elevation values. , , , The four-point plane twist degree is ;

[0033] Calculate the maximum allowable value of the four-point plane twist based on the four-point plane twist.

[0034] The maximum permissible value of the four-point plane distortion is compared with the warning threshold to obtain the warning level of the four-point plane distortion, and the warning level reflects the safety level.

[0035] Furthermore, the maximum permissible value of the four-point plane twist is calculated based on the four-point plane twist and the current standards of the classification society, using the finite element analysis method.

[0036] Furthermore, it also includes multiplying the maximum permissible value of the four-point plane distortion by a first reduction factor and then comparing it with the warning threshold to determine the warning level of the four-point plane distortion.

[0037] Furthermore, the value range of the first reduction coefficient is 0 to 1, and as a preferred embodiment, the value range of the first reduction coefficient includes 0.5, 0.7, and 0.9.

[0038] Furthermore, the warning levels for the four-point plane distortion are divided into three levels: the warning threshold for the first level is 25mm; the warning threshold for the second level is 35mm; and the warning threshold for the third level is 45mm.

[0039] Furthermore, it also includes obtaining a structural stress warning level based on structural stress, wherein the structural stress includes the stress value of the transport equipment support deck structure.

[0040] Furthermore, the initial stress value of the transport equipment support deck structure in the initial state of the semi-submersible barge is calculated using a finite element model. The stress value of the transport equipment support deck structure after the transport equipment has advanced to the semi-submersible barge is then compared with the initial stress value to obtain the maximum allowable change value of the support deck structure. The structural stress warning level is then determined based on the maximum allowable change value of the support deck structure.

[0041] Furthermore, the structural stress warning level is divided into three levels: the warning threshold for level one is 179.2 MPa; the warning threshold for level two is 204.8 MPa; and the warning threshold for level three is 230.4 MPa.

[0042] Furthermore, the structural stress warning level is determined by multiplying the maximum permissible change value of the supporting deck structure by a second reduction factor.

[0043] Furthermore, the value range of the second reduction factor is 0 to 1, and the values ​​of the second reduction factor include 0.5, 0.7, and 0.9.

[0044] Furthermore, if the warning level of the four-point plane distortion is Level 1 or the structural stress warning level is Level 1, then the monitoring result is Level 1; if the warning level of the four-point plane distortion is Level 2 or the structural stress warning level is Level 2, then the monitoring result is Level 2; if the warning level of the four-point plane distortion is Level 3 or the structural stress warning level is Level 3, then the monitoring result is Level 3.

[0045] Furthermore, this also includes making corresponding process adjustment measures based on monitoring results, including: at Level 1 warning, the semi-submersible barge hull structure safety is at a medium risk level, monitoring changes in the four-point plane torsion or structural stress, without making any adjustments; at Level 2 warning, the semi-submersible barge hull structure safety is at a high risk level, slowing down the operating speed of the transport equipment, and making dynamic adjustments to the process based on the four-point elevation values ​​and the four-point plane torsion values; at Level 3 warning, the semi-submersible barge hull structure safety is at an extremely high risk level, stopping the operation of the transport equipment, and making process adjustments based on the four-point elevation values ​​and the four-point plane torsion values ​​until the structural safety level drops below the medium risk level.

[0046] On the other hand, a monitoring and early warning system for the structural safety of a semi-submersible barge loading vessel is also proposed, including a displacement sensor, a data acquisition instrument, and a processor. The displacement sensor is used to acquire the initial elevation values ​​of the four corner points of the semi-submersible barge loading vessel and the elevation values ​​of the semi-submersible barge. The initial elevation values ​​are the elevation values ​​of the four corner points before the transport equipment moves to the semi-submersible barge, and the elevation values ​​of the semi-submersible barge are the elevation values ​​of the four corner points after the transport equipment moves to the semi-submersible barge.

[0047] The data acquisition device is used to input the initial elevation values ​​of the four corner points and the semi-submersible barge elevation values ​​into the processor.

[0048] The processor calculates the four-point planar torsion of the semi-submersible barge loading hull. The method for obtaining the four-point planar torsion of the semi-submersible barge loading hull includes sequentially calculating the absolute value of the difference between the semi-submersible barge elevation value and the initial elevation value at each of the four corner points. , , , The four-point plane twist degree is The processor is further configured to calculate the maximum permissible value of the four-point plane distortion based on the four-point plane distortion; compare the maximum permissible value of the four-point plane distortion with the warning threshold to obtain and output the warning level of the four-point plane distortion, wherein the warning level reflects the safety level.

[0049] The displacement sensor uses a hydrostatic level, which is installed at the four corners of the semi-submersible barge.

[0050] It also includes stress sensors, which are installed at the top deck of each support of the semi-submersible barge and arranged in the longitudinal direction of the semi-submersible barge to obtain the stress value of the support deck structure of the transport equipment.

[0051] This invention provides a method and system for monitoring and early warning of the structural safety of a semi-submersible barge during loading, addressing safety issues such as overloading, uneven load distribution, and excessive local loads causing structural damage during loading. The method and system, combined with analysis of the stress characteristics of semi-submersible barge loading, propose a three-level early warning mechanism and a method for setting early warning values. This enables the assessment of the structural safety risk level of the semi-submersible barge loading vessel and provides decision support for rapid process adjustments, filling a gap in existing technologies. The method can provide timely warnings before accidents occur and offer decision support for process adjustments, eliminating safety hazards and preventing accidents.

[0052] Example 2

[0053] This embodiment provides a monitoring and early warning method for the safety control of the hull structure of a semi-submersible barge.

[0054] The cargo to be loaded is placed on the transport equipment, but before it advances to the semi-submersible barge, such as Figure 1 As shown, the current state of the semi-submersible barge is taken as the initial state. In the initial state, the elevation of the four corner points of the semi-submersible barge is 0, and the plane formed by the four corner points is called the four-point plane. The elevation of the four corner points is determined by setting a value at each of the four intersection points.

[0055] During the loading process of a semi-submersible barge, the elevations of the four corner points will change. The spatial relationship between these four corner points can be divided into two cases: First, any three points form a plane, and the remaining point is also within that plane; second, any three points form a plane, but the remaining point is not within that plane, such as... Figure 2 As shown. When the spatial relationship of the four corner points is the second case, the semi-submersible barge will twist, which is detrimental to the stress safety of the semi-submersible barge. Therefore, twist is used as a key parameter for the safety control of the hull structure of the semi-submersible barge. Here, the four-point planar torsion degree is introduced to characterize the torsion of the semi-submersible barge.

[0056] The four-point planar torsion calculation method uses the absolute value of the difference between the sums of the elevations of two sets of diagonal corner points. Taking the transport of a wind turbine platform from a SPMT vehicle to a semi-submersible barge as an example... Figure 3 As shown, the elevations of the four corner points 1, 2, 3, and 4 of the semi-submersible barge are respectively... , , , The four-point plane twist degree is .

[0057] Using the four-point planar torsion degree as a key parameter for the safety control of the semi-submersible barge loading hull structure has the advantage of guiding rapid adjustments to the on-site process. The adjustment approach is as follows: by lowering the highest corner point or raising the lowest corner point through process adjustments, the elevation adjustment amount is equal to the value of the four-point planar torsion degree. Taking the SPMT vehicle transporting a wind power platform as an example, assuming the elevations of the four corner points 1, 2, 3, and 4 are 30mm, -15mm, 20mm, and 10mm respectively, the four-point planar torsion degree is 55mm. Lowering corner point 1 or raising corner point 2 results in an adjustment amount of 55mm.

[0058] Structural stress can directly reflect the stress condition of a semi-submersible barge hull structure, therefore it is considered another key parameter for the safety control of the semi-submersible barge loading hull structure. A negative bending moment exists at the support deck of the transport equipment on a semi-submersible barge; therefore, the deck structure at the support is considered a key test section for structural stress control. Furthermore, the risk of structural failure at the support is relatively high, especially near the midships, making it a critical test point for structural stress control.

[0059] A finite element model of a semi-submersible barge under load was established to analyze the influence of four-point planar torsion on the stress of the semi-submersible barge. The maximum allowable value of the four-point planar torsion was calculated based on the current classification society standards for stress in semi-submersible barge hull components. For example, assuming an allowable deck stress of 236 MPa corresponds to a four-point planar torsion of 50 mm, 50 mm was taken as the control value for the four-point planar torsion.

[0060] The structural stress values ​​at the stress sensor locations in the initial state of the semi-submersible barge were calculated using a finite element model. The maximum allowable change in structural stress relative to the initial state was used as the control value for structural stress. Assuming the maximum stress at all measuring points in the initial state is -20 MPa, the control value for structural stress is 256 MPa.

[0061] Based on the control values, three levels of early warning values ​​are established for the four-point planar torsion and structural stress of the semi-submersible barge. Considering that there is a certain safety margin when issuing early warnings, the reduction coefficients for the four-point planar torsion at the three levels can be set to 0.5, 0.7, and 0.9, respectively. Then, the early warning values ​​for the four-point planar torsion at levels I, II, and III are 25mm, 35mm, and 45mm, respectively. The reduction coefficients for structural stress can be set to 0.7, 0.8, and 0.9, respectively. Then, the early warning values ​​for the structural stress at levels I, II, and III are 179.2MPa, 204.8MPa, and 230.4MPa, respectively.

[0062] Based on the monitoring values ​​of the four-point planar torsion and structural stress of the semi-submersible barge, a three-level early warning mechanism for the structural safety of the loaded hull of the semi-submersible barge is determined: a Level I early warning is issued when any of the four-point planar torsion or structural stress monitoring values ​​exceeds its respective Level I early warning value; a Level II early warning is issued when any of the four-point planar torsion or structural stress monitoring values ​​exceeds its respective Level II early warning value; and a Level III early warning is issued when any of the four-point planar torsion or structural stress monitoring values ​​exceeds its respective Level III early warning value.

[0063] Based on the warning level, the risk level of the semi-submersible barge's structural safety is determined, and corresponding process adjustment measures are taken accordingly. If there is no warning, the semi-submersible barge's structural safety is at a low risk level, and no adjustments are made. Under a Level I warning, the semi-submersible barge's structural safety is at a medium risk level; monitoring changes in the four-point planar torsion or structural stress is conducted, but no adjustments are made. Under a Level II warning, the semi-submersible barge's structural safety is at a high risk level; the operating speed of the transport equipment is slowed down, and dynamic adjustments to the process are guided by the four-point elevation and four-point planar torsion values. Under a Level III warning, the semi-submersible barge's structural safety is at an extremely high risk level; the operation of the transport equipment is stopped, and process adjustments are guided by the four-point elevation and four-point planar torsion values ​​until the structural safety level drops below moderate before the transport equipment can resume operation. Taking the SPMT vehicle transporting a wind power platform as an example, assuming the elevations of the four corner points 1, 2, 3, and 4 are 15mm, -10mm, 30mm, and 15mm respectively, and the plane twist of the four points is 40mm, exceeding the Level II warning value, and assuming the structural stress increment is 200MPa, exceeding the Level I warning, then the warning level is Level II, and the semi-submersible barge structure is at a high risk level. Dynamic adjustments are made to the process: by reducing the oil pressure in areas B2 and D2 to lower corner point 3 or increasing the oil pressure in areas B1 and D1 to raise corner point 2, the adjustment amount is ≤40mm.

[0064] Example 3

[0065] This embodiment provides a monitoring and early warning system for the safety control of the hull structure of a semi-submersible barge loading vessel, such as... Figure 4 As shown, the system includes a sensor, a data acquisition instrument, an information transmission device, a host computer system, data processing software, an audible and visual alarm device, a power supply, and process adjustment instructions. The sensor is communicatively connected to the data acquisition instrument, the host computer system is connected to the data acquisition instrument through the information transmission device, and the audible and visual alarm device is communicatively connected to the host computer system.

[0066] The sensors include displacement sensors and stress sensors. The displacement sensors utilize a static level 3, positioned at the four corners of the semi-submersible barge 1. Static level supports 6 are installed on the end deck of the semi-submersible barge 1, and the static level 3 is mounted on the supports 6. Figure 5 As shown. Stress sensors 2 are installed at the top deck of each support of the semi-submersible barge 1, arranged along the longitudinal direction of the semi-submersible barge, as shown. Figure 6 As shown.

[0067] The data processing software of the monitoring and early warning system for the safety control of the semi-submersible barge loading hull structure has the function of real-time calculation of the four-point plane torsion. Installed on the host computer system, the process adjustment instructions can provide decision support for different adjustment measures for the process according to the safety risk level of the semi-submersible barge loading hull structure, and can be displayed on the host computer system.

[0068] The audible and visual alarm device of the monitoring and early warning system for the safety control of the semi-submersible barge loading hull structure can distinguish alarms for different risk levels of the semi-submersible barge structure safety, and there is a corresponding relationship with the process adjustment instructions.

[0069] The portable power supply provides power to the data acquisition device and the information transmission device.

[0070] This invention provides a method and system for monitoring and early warning of the structural safety of a semi-submersible barge during loading, addressing safety issues such as overloading, uneven load distribution, and excessive local loads causing structural damage during loading. The method and system, combined with analysis of the stress characteristics of semi-submersible barge loading, propose a three-level early warning mechanism and a method for setting early warning values. This enables the assessment of the structural safety risk level of the semi-submersible barge loading vessel and provides decision support for rapid process adjustments, filling a gap in existing technologies. The method can provide timely warnings before accidents occur and offer decision support for process adjustments, eliminating safety hazards and preventing accidents.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the principle of the present invention, and such improvements should also be considered as protection of the present invention.

Claims

1. A method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel, characterized in that, Includes the following steps: The method for obtaining the four-point planar torsion of the semi-submersible barge loading hull includes: obtaining the initial elevation values ​​of the four corner points before the transport equipment advances to the semi-submersible barge; obtaining the semi-submersible barge elevation values ​​at the four corner points after the transport equipment advances to the semi-submersible barge; and calculating the absolute value of the difference between the semi-submersible barge elevation values ​​at the four corner points and the initial elevation values. , , , The four-point plane twist degree is ; Calculate the maximum allowable value of the four-point plane twist based on the four-point plane twist. The maximum permissible value of the four-point plane distortion is compared with the warning threshold to obtain the warning level of the four-point plane distortion, and the warning level reflects the safety level. It also includes multiplying the maximum permissible value of the four-point plane distortion by a first reduction factor and then comparing it with the warning threshold to determine the warning level of the four-point plane distortion; The initial stress value of the transport equipment support deck structure in the initial state of the semi-submersible barge is calculated by the finite element model. The stress value of the transport equipment support deck structure after the transport equipment has advanced to the semi-submersible barge is compared with the initial stress value to obtain the maximum allowable change value of the support deck structure. The structural stress warning level is obtained based on the maximum allowable change value of the support deck structure. The initial stress value of the transport equipment support deck structure in the initial state of the semi-submersible barge is calculated by using a finite element model. The maximum allowable change value of the support deck structure is obtained by subtracting the initial stress value from the stress value of the transport equipment support deck structure after the transport equipment has advanced to the semi-submersible barge. The structural stress warning level is obtained based on the maximum allowable change value of the support deck structure.

2. The method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel as described in claim 1, characterized in that, The first reduction factor ranges from 0 to 1.

3. A method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel as described in any one of claims 1-2, characterized in that, It also includes obtaining a structural stress warning level based on structural stress, which includes the stress value of the transport equipment support deck structure.

4. The method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel as described in claim 1, characterized in that, The structural stress warning level is determined by multiplying the maximum permissible variation value of the supporting deck structure by the second reduction factor.

5. The method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel as described in claim 4, characterized in that, The second reduction factor ranges from 0 to 1.

6. The method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel as described in claim 5, characterized in that, If the warning level of the four-point plane distortion is Level 1 or the structural stress warning level is Level 1, then the monitoring result is Level 1; if the warning level of the four-point plane distortion is Level 2 or the structural stress warning level is Level 2, then the monitoring result is Level 2. If the warning level for the four-point planar torsion is Level 3 or the warning level for structural stress is Level 3, then the monitoring result is Level 3.

7. A method for monitoring and early warning of the structural safety of a semi-submersible barge loading vessel as described in claim 6, characterized in that, This also includes making corresponding process adjustment measures based on monitoring results, including: at the first level of warning, the semi-submersible barge hull structure is at a medium risk level, and attention is paid to changes in the four-point plane torsion or structural stress, without making any adjustments; at the second level of warning, the semi-submersible barge hull structure is at a high risk level, the operating speed of the transport equipment is slowed down, and dynamic adjustments to the process are made based on the four-point elevation values ​​and the four-point plane torsion values; at the third level of warning, the semi-submersible barge hull structure is at an extremely high risk level, the operation of the transport equipment is stopped, and process adjustments are made based on the four-point elevation values ​​and the four-point plane torsion values ​​until the structural safety level drops below the medium risk level.

8. A monitoring and early warning system for the structural safety of a semi-submersible barge loading vessel, characterized in that, Includes displacement sensors, data acquisition units, and processors; The displacement sensor is used to obtain the initial elevation values ​​of the four corner points of the semi-submersible barge loading hull and the elevation values ​​of the semi-submersible barge. The initial elevation values ​​are the elevation values ​​of the four corner points before the transport equipment moves to the semi-submersible barge, and the elevation values ​​of the semi-submersible barge are the elevation values ​​of the four corner points after the transport equipment moves to the semi-submersible barge. The data acquisition device is used to input the initial elevation values ​​of the four corner points and the semi-submersible barge elevation values ​​into the processor. The processor calculates the four-point planar torsion of the semi-submersible barge loading hull. The method for obtaining the four-point planar torsion of the semi-submersible barge loading hull includes sequentially calculating the absolute value of the difference between the semi-submersible barge elevation value and the initial elevation value at each of the four corner points. , , , ; The four-point plane distortion is The processor is further configured to compare the maximum allowable value of the four-point plane distortion calculated based on the four-point plane distortion with the warning threshold, obtain and output the warning level of the four-point plane distortion, wherein the warning level reflects the safety level. It also includes multiplying the maximum permissible value of the four-point plane distortion by a first reduction factor and then comparing it with the warning threshold to determine the warning level of the four-point plane distortion; The initial stress value of the transport equipment support deck structure in the initial state of the semi-submersible barge is calculated by the finite element model. The maximum allowable change value of the support deck structure is obtained by subtracting the stress value of the transport equipment support deck structure after the transport equipment has advanced to the semi-submersible barge from the initial stress value. The structural stress warning level is determined based on the maximum permissible change value of the supporting deck structure; The initial stress value of the transport equipment support deck structure in the initial state of the semi-submersible barge is calculated by the finite element model. The maximum allowable change value of the support deck structure is obtained by subtracting the stress value of the transport equipment support deck structure after the transport equipment has advanced to the semi-submersible barge from the initial stress value. The structural stress warning level is determined based on the maximum permissible change value of the supporting deck structure.

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