Method for estimating the strength of a damaged ship structure

Abstract

The application relates to a damaged ship structure strength estimation method, belonging to the ship safety technical field, wherein the method comprises the following steps: obtaining the deflection-width ratio of a target structure on a ship under different damage conditions and the reduction coefficient of ultimate strength; performing nonlinear fitting by taking the deflection-width ratio as the independent variable and the reduction coefficient of ultimate strength as the dependent variable to obtain a reduction coefficient function; when the target structure is damaged, obtaining the current deflection-width ratio of the target structure, and substituting the current deflection-width ratio into the reduction coefficient function to obtain a current reduction coefficient; and multiplying the current reduction coefficient of the target structure and the complete ultimate strength of the target structure to obtain the current residual ultimate strength of the target structure. The application can effectively consider the rapid evaluation and evaluation accuracy of the residual ultimate strength of the ship structure.

Description

Technical Field

[0001] This invention relates to the field of ship safety technology, and in particular to a method for estimating the structural strength of a damaged ship. Background Technology

[0002] In the civilian and commercial sectors of ocean shipping, logistics warehousing, and maritime transport, large vessels such as civilian bulk carriers, large container ships, and ocean-going freighters may experience severe and extensive nonlinear deformation of their main hull structure during operation due to accidents such as extreme wind and wave impacts, collisions at sea, grounding, or sudden gas explosions inside the cargo holds. Following such accidents, in order to guide maritime emergency rescue and relief efforts, ensure the safety of crew members, and minimize economic losses to civilian shipping, a precise assessment of the structural safety of the damaged hull is urgently needed within a very short timeframe. The residual ultimate strength of the hull is a core technical indicator for measuring the structural safety of such damaged vessels.

[0003] Currently, the main methods for calculating the residual ultimate strength of damaged ship hulls include direct calculation methods, progressive failure methods, and nonlinear finite element methods. However, these methods suffer from the following technical bottlenecks:

[0004] 1) The direct calculation method is based on a simple linear stress distribution assumption and does not consider the post-buckling characteristics and failure sequence of higher-order components, so the calculation results are generally too high.

[0005] 2) Although the stepwise destruction method overcomes some of the computational complexity when dealing with complex compressed units, the process is still complex and time-consuming.

[0006] 3) The computational accuracy of the nonlinear finite element method is heavily dependent on the accuracy of the mesh model of the damaged structure. However, complex structures after damage cannot be accurately modeled, and model building and solving require a lot of time and manpower, which is impractical in on-site emergency environments with extremely high time requirements. Summary of the Invention

[0007] In view of this, it is necessary to provide a method, device, electronic equipment and storage medium for estimating the structural strength of damaged ships, so as to solve the problem of the difficulty in balancing the timeliness and accuracy of the calculation of the remaining ultimate strength of damaged ships.

[0008] To address the aforementioned problems, in a first aspect, the present invention provides a method for estimating the structural strength of a damaged ship, comprising:

[0009] Obtain the ratio of deflection to width of the target structure on the ship under different damage conditions, as well as the reduction factor of the ultimate strength;

[0010] Using the ratio of deflection to width as the independent variable and the reduction coefficient of ultimate strength as the dependent variable, a nonlinear fitting is performed to obtain the reduction coefficient function;

[0011] When the target structure is damaged, the ratio of the current deflection to the width of the target structure is obtained, and the ratio of the current deflection to the width is substituted into the reduction coefficient function to obtain the current reduction coefficient;

[0012] The current residual ultimate strength of the target structure is obtained by multiplying the current reduction factor of the target structure by the complete ultimate strength of the target structure.

[0013] In one possible implementation, when the target structure is a deck, the different damage conditions include different degrees of centrosymmetric deformation and non-centrosymmetric deformation.

[0014] In one possible implementation, the target structure includes multiple structures, each of which is a substructure of the hull structure; the method further includes:

[0015] When multiple target structures deform, the current reduction coefficients of the multiple target structures are multiplied together to obtain the current reduction coefficient of the hull structure;

[0016] The current residual ultimate strength of the hull structure is obtained by multiplying the current reduction factor of the hull structure by the complete ultimate strength of the hull structure.

[0017] In one possible implementation, the deformation of the multiple target structures is either a joint deformation or an independent deformation across regions.

[0018] In one possible implementation, the expression for the reduction coefficient function is:

[0019]

[0020] in, This is the reduction factor; It is an exponential function; For deformation deflection; denoted as the structural width; A, B, and C are fitting coefficients.

[0021] In one possible implementation, obtaining the ratio of the current deflection to the width of the target structure when the target structure is damaged includes:

[0022] When the target structure is damaged due to a maritime accident, the ratio of the current deflection to the width of the target structure is obtained.

[0023] In one possible implementation, the target ship structure includes at least one of hull plating, plate frame structure, and compartment structure.

[0024] Secondly, the present invention also provides a device for estimating the structural strength of a damaged ship, comprising:

[0025] The fitting data acquisition module is used to obtain the ratio of deflection to width of the target structure on the ship under different damage conditions, as well as the reduction factor of the ultimate strength.

[0026] The fitting module is used to perform nonlinear fitting with the ratio of deflection to width as the independent variable and the reduction coefficient of ultimate strength as the dependent variable to obtain the reduction coefficient function.

[0027] The current reduction coefficient estimation module is used to obtain the ratio of the current deflection to the width of the target structure when the target structure is damaged, and substitute the ratio of the current deflection to the width into the reduction coefficient function to obtain the current reduction coefficient;

[0028] The current remaining ultimate strength estimation module is used to multiply the current reduction factor of the target structure by the complete ultimate strength of the target structure to obtain the current remaining ultimate strength of the target structure.

[0029] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the method for estimating the strength of a damaged ship structure as described above.

[0030] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for estimating the strength of a damaged ship structure as described in any of the preceding claims.

[0031] The beneficial effects of this invention are:

[0032] This invention uses the ratio of the deflection to the width of a target ship structure as the core parameter representing the reduction factor of its ultimate strength, and constructs a mapping relationship between it and the reduction factor of ultimate strength. Thus, when a ship is damaged, the current remaining ultimate strength of the target structure can be quickly calculated based on this mapping relationship, which facilitates the assessment of the safety of the ship after damage by the staff.

[0033] The method of this invention has extremely high computational efficiency: it eliminates the dependence on refined and highly complex damage finite element models, and only needs to obtain macroscopic geometric features such as deflection and structural feature width after damage to quickly complete the analytical evaluation of the remaining ultimate strength.

[0034] Excellent prediction accuracy and engineering applicability: Through simulation and experimental comparison, the calculation error proposed in this invention does not exceed 10%, effectively balancing rapid evaluation and engineering accuracy.

[0035] The theory has strong universality and inherent consistency: It has been confirmed that the residual strength attenuation law of different levels of structure such as hull plates, plate frames and compartments after deformation has inherent consistency and can all be described by the same functional form, with only the fitting coefficients differing. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart illustrating an embodiment of the method for estimating the structural strength of a damaged ship provided by the present invention;

[0038] Figure 2 Schematic diagrams of plate models with different aspect ratios and their large deformations provided by the present invention; Figure 2 (a) shows a hull model with an aspect ratio of 0.5. Figure 2 (b) is a hull model with an aspect ratio of 1.5. Figure 2 The middle (c) is a hull plate model with an aspect ratio of 2.5. Figure 2 The middle (d) is a hull plate model with an aspect ratio of 3.5;

[0039] Figure 3 A schematic diagram illustrating how the reduction factor of the ultimate strength of different structures provided by the present invention varies with the ratio of deflection to width; Figure 3 Figure (a) is a schematic diagram showing the variation of the reduction factor of the ultimate strength of the hull plate with the ratio of deflection to width. Figure 3 (b) is a schematic diagram showing the variation of the reduction factor of the ultimate strength of the plate frame structure with the ratio of deflection to width;

[0040] Figure 4 This is a schematic diagram of the deformed plate frame structure model provided by the present invention;

[0041] Figure 5 A flowchart illustrating another embodiment of the method for estimating the structural strength of a damaged ship provided by the present invention;

[0042] Figure 6 A schematic cross-sectional view of the hull box girder section model provided by the present invention;

[0043] Figure 7 This is a schematic diagram of the static force application position on the module model provided by the present invention; Figure 7 (a) is a schematic diagram showing the location where the load on the top plate of the compartment is applied. Figure 7 (b) is a schematic diagram showing the location where the side load of the compartment is applied;

[0044] Figure 8 This is a schematic diagram of the overall failure of the compartment section during side deformation provided by the present invention;

[0045] Figure 9 A schematic diagram of an embodiment of the electronic device provided by the present invention. Detailed Implementation

[0046] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0047] 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 a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] In the description of the embodiments of this invention, unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," etc., used in the embodiments of this invention are used to distinguish similar objects, and are not used to describe a specific order or sequence, nor to indicate or imply their relative importance or implicitly specify the number of indicated technical features. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, and the number of objects is not limited; for example, a first object can be one or more.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] Reference Figure 1 The diagram illustrates a flowchart of an embodiment of the method for estimating the structural strength of a damaged ship provided by the present invention. The method includes:

[0051] S101, obtain the ratio of deflection to width of the target structure on the ship under different damage conditions, as well as the reduction factor of the ultimate strength.

[0052] The target structure can be a ship structure at different levels, such as hull plates, plate frame structures, or compartment structures. Hull plates refer to the basic metal plate components that make up the continuous, enclosed surfaces of the hull, decks, and bulkheads. Plate frame structures refer to combined structural units composed of hull plates and their longitudinal and transverse ribs on their backside, bearing local loads and transferring them to the main supporting components; specifically, they can include deck plate frames, bottom plate frames, side plate frames, and bulkhead plate frames. Compartment structures refer to independent three-dimensional spatial segmented units enclosed by components such as the bottom, sides, decks, and transverse bulkheads between adjacent transverse bulkheads.

[0053] The width of a plate frame structure can be the calculated span or actual range within its own plane, perpendicular to the direction of the main supporting members (such as strong crossbeams and longitudinal girder). For example, the width of a ship's bottom plate structure refers to the horizontal distance between the port and starboard side plate frames.

[0054] The width of the compartment structure can be the maximum external dimension in the beam direction.

[0055] Deflection refers to the linear displacement of a point on a structure relative to its initial position after it is subjected to external forces (such as bending force or torque). In this embodiment, the deflection used to calculate the ratio refers to the maximum deflection.

[0056] The reduction factor of ultimate strength refers to the ratio of the ultimate strength of a structure under damaged conditions to the reference ultimate strength under intact conditions. In a physical sense, it is used as a reduction factor or loss factor of strength.

[0057] The ratio of deflection to width of the target structure under different damage conditions, as well as the reduction factor of ultimate strength, can be obtained through theoretical calculation, numerical simulation, or experimental methods.

[0058] S102, with the ratio of deflection to width as the independent variable and the reduction coefficient of ultimate strength as the dependent variable, performs nonlinear fitting to obtain the reduction coefficient function.

[0059] Taking ship hull plates as an example, for hull plates undergoing large overall deformation, the deflection value far exceeds their thickness, and the excessive deformation amplitude leads to an increase in the overall flexibility of the steel plate. The compressive strength and flexibility of ship hull plates... Related, and Where t is the thickness, b is the width, and E is the elastic modulus of the material. The yield strength of the material; that is With thickness With width The ratio is relevant. For hull plates that undergo significant overall deformation due to a sudden accident, relying solely on plate thickness is insufficient. It is difficult to accurately describe the load-bearing characteristics of plates with large deformation. Considering the deformation amplitude... and board width These factors together determine the degree of bending of the plate on a macroscopic scale; therefore, the ratio of deformation amplitude to plate width, i.e., the deflection-to-width ratio, is selected. This serves as a core parameter characterizing the residual ultimate strength of hull plates undergoing large deformation. A reduction factor for ultimate strength is also defined. It is the ratio of the residual ultimate strength of the structure to the ultimate strength of the structure in its intact state when the deformation amplitude is arbitrary.

[0060] By analyzing different aspect ratios ( , , , A series of simulation calculations were performed on the thin plate, such as... Figure 2 As shown, the models of the four thin plates with different aspect ratios before and after large deformation are illustrated. Figure 3 As shown in (a), the four different aspect ratios of the thin plates are illustrated. Parameters and reduction factor for ultimate strength The fitting results show that the reduction factor of the ultimate strength is independent of the aspect ratio of the plate and depends only on the deflection-to-width ratio. Parameters. By fitting data points at different deformation degrees, a unified nonlinear reduction coefficient function for the hull plates can be obtained:

[0061]

[0062] This function form exhibits good consistency in hull plating, plate frame structures, and compartment structures. For example... Figure 3 (b) shows the w / b parameter of a plate frame structure and its reduction factor for its ultimate strength. The fitting results. A model of this plate frame structure after large deformation is shown below. Figure 4 As shown. According to Figure 3 (b) shows that this function form is also applicable to plate frame structures.

[0063] Therefore, the reduction coefficient function can be used in the same functional form for different structures: ,in, This is the reduction factor; It is an exponential function; For deformation deflection; The width is denoted as ; A, B, and C are fitting coefficients, which are used to describe the structure, with only the fitting coefficients differing.

[0064] S103, When the target structure is damaged, obtain the ratio of the current deflection to the width of the target structure, and substitute the ratio of the current deflection to the width into the reduction coefficient function to obtain the current reduction coefficient.

[0065] S104, multiply the current reduction factor of the target structure by the complete ultimate strength of the target structure to obtain the current remaining ultimate strength of the target structure.

[0066] Multiplying the current reduction factor of the target structure by its ultimate strength in the intact state yields the current remaining ultimate strength of the target structure.

[0067] The residual ultimate strength refers to the maximum axial compressive load or total longitudinal bending moment that a ship structure can still withstand after suffering large macroscopic deformation damage caused by sudden accidents such as grounding, collision, or deflagration.

[0068] The method for estimating the structural strength of a damaged ship provided in this embodiment can be applied to a system for estimating the structural strength of a damaged ship. This system can be a software system running on a terminal device. The terminal device can be a tablet computer, shipborne equipment, augmented reality (AR) / virtual reality (VR) device, laptop computer, ultra-mobile personal computer (UMPC), netbook, personal digital assistant (PDA), mobile phone, etc. This embodiment does not impose any restrictions on the specific type of terminal device.

[0069] In summary, this embodiment uses the ratio of the deflection to the width of the target ship structure as the core parameter representing the reduction factor of its ultimate strength, and constructs a mapping relationship between it and the reduction factor of ultimate strength. Thus, when the ship is damaged, the current remaining ultimate strength of the target structure can be quickly calculated based on this mapping relationship, which facilitates the staff to assess the safety of the ship after the damage.

[0070] The method in this embodiment has extremely high computational efficiency: it eliminates the reliance on refined and highly complex damage finite element models, and only requires obtaining macroscopic geometric features such as deflection and structural feature width after damage to quickly complete the analytical evaluation of the remaining ultimate strength.

[0071] Excellent prediction accuracy and engineering applicability: Through simulation and experimental comparison, the calculation error proposed in this embodiment does not exceed 10%, effectively balancing rapid evaluation and engineering accuracy.

[0072] The theory has strong universality and inherent consistency: It has been confirmed that the residual strength attenuation law of different structural levels such as hull plates, plate frames and compartments after deformation has an inherent consistency and can all be expressed by the same functional form. The description shows that only the fitting coefficients differ.

[0073] In some embodiments of the present invention, when the target structure is a deck, different damage conditions include different degrees of centrosymmetric deformation and non-centrosymmetric deformation.

[0074] Specifically, when a sudden large transverse deformation occurs on the deck, for the same deformation amplitude, the closer the large deformation location is to the hull side and transverse bulkheads, the steeper the deformation, resulting in greater structural strength loss. Asymmetric deformation at different large deformation locations results in greater structural strength loss in the hull beams compared to centrosymmetric deformation. Therefore, for the deck, fitting can be performed based on centrosymmetric and asymmetric deformation data. In a specific example, the reduction factor function applicable to deck deformation conditions is:

[0075]

[0076] In some embodiments of the present invention, the target structure includes multiple structures, each of which is a substructure of the hull structure; such as Figure 5 As shown, the method also includes:

[0077] S501, when multiple target structures deform, the current reduction coefficients of the multiple target structures are multiplied together to obtain the current reduction coefficient of the hull structure;

[0078] S502, multiply the current reduction factor of the hull structure by the complete ultimate strength of the hull structure to obtain the current remaining ultimate strength of the hull structure.

[0079] Specifically, the deformation of multiple target structures can be either joint deformation or independent deformation across regions.

[0080] Taking the independent deformation of the double-sided bulkheads across different regions as an example, the weakening effect of side deformation on the overall longitudinal ultimate strength of the hull is much smaller than that of the deck. The reduction factor approaches 0.96 during unilateral deformation, and when large deformations occur simultaneously on both sides, the hull structural reduction factor is approximately equal to the product of the unilateral reduction factors.

[0081]

[0082] in, , These represent the large deformation deflections on both sides of the hull.

[0083] Taking the combined deformation of the deck and side structures as an example, the contributions of the deck and side structures to the overall longitudinal strength loss approach the upper limits of 52% and 4%, respectively. When the two different structures, the deck and side, undergo combined large deformation, the reduction factor of the overall hull ultimate strength can also be equal to the product of the reduction factors of each independently deformed part:

[0084]

[0085] in, This is the reduction factor for large deck deformation. This is the reduction factor for large deformation on the hull side. Comparison with simulation results shows that the error of this product formula does not exceed 10%, verifying its engineering applicability.

[0086] After calculating the current reduction factor of the hull structure, multiply the current reduction factor of the hull structure by the complete ultimate strength of the hull structure to obtain its remaining ultimate strength.

[0087] In some embodiments of the present invention, when the target structure is damaged, the step of obtaining the ratio of the current deflection to the width of the target structure includes:

[0088] When a ship is involved in a maritime accident that damages the target structure, the ratio of the current deflection to the width of the target structure is obtained.

[0089] Specifically, in scenarios with high timeliness requirements, such as when a ship is damaged in a maritime accident, this embodiment estimates the remaining ultimate strength based on the reduction coefficient function. In scenarios with low timeliness requirements, the estimation method can be selected according to the needs.

[0090] In a specific example of this invention, the ultimate strength of the hull plate was verified using a standard academic case study of thin-plate shipbuilding. To verify the scientific validity of the underlying computational framework, a standard academic testing system was used for simulation comparison. Three simply supported plates with different geometric dimensions were selected. mm mm The results were verified using a method involving mm. Comparison of the finite element calculations with those obtained by Cui and Max's experiments showed good agreement among the three methods. The finite element method can effectively predict the ultimate strength of a plate under axial compressive load, confirming the accuracy of the basic numerical prediction framework.

[0091] In a specific example of this invention, the reduction factor for ultimate strength is calculated using the large deformation and multi-point combined deformation of a large civilian ship's box girder as an example. A long-span box girder section structure of a civilian bulk carrier with standard component dimensions is used as the calculation model. The cross-section of the section structure model is as follows... Figure 6 As shown, the hull beams are constructed using a "1 / 2+1+1 / 2 section" pattern, where "1" represents a complete section area and "1 / 2" represents half a section area. The length, width, and height of the hull beams are 24m, 16m, and 10m, respectively. Large deformation damage conditions with different deflection-to-width ratios are controlled by applying impact loads to the top deck and the side areas of each compartment. The load application locations are shown in the diagram. Figure 7 As shown in the diagram, after static force is applied, a schematic diagram of the overall failure of the compartment during side deformation is shown. Figure 8As shown, complex multi-point combined large deformation measurement data are input into the reduction coefficient product calculation formula and compared with the results of high-precision nonlinear finite element dynamics solutions. The comparison verifies that the simulation calculation results differ from the calculation results of the reduction coefficient formula by no more than 10%, verifying the extremely high applicability of this formula in civil engineering assessment.

[0092] The present invention also provides a device for estimating the structural strength of a damaged ship, the device comprising:

[0093] The fitting data acquisition module is used to obtain the ratio of deflection to width of the target structure on the ship under different damage conditions, as well as the reduction factor of the ultimate strength.

[0094] The fitting module is used to perform nonlinear fitting with the ratio of deflection to width as the independent variable and the reduction coefficient of ultimate strength as the dependent variable to obtain the reduction coefficient function.

[0095] The current reduction coefficient estimation module is used to obtain the ratio of the current deflection to the width of the target structure when the target structure is damaged, and substitute the ratio of the current deflection to the width into the reduction coefficient function to obtain the current reduction coefficient.

[0096] The current remaining ultimate strength estimation module is used to multiply the current reduction factor of the target structure by the complete ultimate strength of the target structure to obtain the current remaining ultimate strength of the target structure.

[0097] It should be noted that the implementation principles or processes of the above modules can be referred to the aforementioned implementation examples of the method for estimating the structural strength of damaged ships, and will not be elaborated upon here.

[0098] Reference Figure 9 The present invention illustrates an electronic device 900. The electronic device 900 includes a processor 901, a memory 902, and a display 903. Figure 9 Only some components of the electronic device 900 are shown, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0099] In some embodiments, processor 901 may be a central processing unit (CPU), microprocessor, or other data processing chip, used to run program code stored in memory 902 or process data, such as the method for estimating the strength of damaged ship structures in this invention.

[0100] In some embodiments, processor 901 may be a single server or a group of servers. The server group may be centralized or distributed. In some embodiments, processor 901 may be local or remote. In some embodiments, processor 901 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, public cloud, hybrid cloud, community cloud, distributed cloud, internal cloud, multi-cloud, etc., or any combination thereof.

[0101] In some embodiments, memory 902 may be an internal storage unit of electronic device 900, such as a hard disk or memory of electronic device 900. In other embodiments, memory 902 may also be an external storage device of electronic device 900, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on electronic device 900.

[0102] Furthermore, the memory 902 may include both internal storage units of the electronic device 900 and external storage devices. The memory 902 is used to store application software and various types of data installed on the electronic device 900.

[0103] In some embodiments, display 903 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 903 is used to display information from electronic device 900 and to display a visual user interface. Components 901-903 of electronic device 900 communicate with each other via a system bus.

[0104] In one embodiment, when processor 901 executes the damaged ship structure strength estimation program in memory 902, the following steps can be implemented:

[0105] Obtain the ratio of deflection to width of the target structure on the ship under different damage conditions, as well as the reduction factor of the ultimate strength;

[0106] Using the ratio of deflection to width as the independent variable and the reduction coefficient of ultimate strength as the dependent variable, a nonlinear fitting was performed to obtain the reduction coefficient function;

[0107] When the target structure is damaged, the ratio of the current deflection to the width of the target structure is obtained, and the ratio of the current deflection to the width is substituted into the reduction coefficient function to obtain the current reduction coefficient;

[0108] Multiply the current reduction factor of the target structure by the complete ultimate strength of the target structure to obtain the current remaining ultimate strength of the target structure.

[0109] It should be understood that when the processor 901 executes the damaged ship structure strength estimation program in the memory 902, in addition to the functions mentioned above, it can also perform other functions, as can be found in the description of the corresponding method embodiments above.

[0110] Furthermore, this embodiment of the invention does not specifically limit the type of electronic device 900 mentioned. Electronic device 900 can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other portable electronic device. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic device can also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the invention, electronic device 900 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0111] In one embodiment, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by the processor, implements the steps of any of the above-described methods for estimating the strength of a damaged ship structure.

[0112] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0113] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for estimating the structural strength of a damaged ship, characterized in that, include: Obtain the ratio of deflection to width of the target structure on the ship under different damage conditions, as well as the reduction factor of the ultimate strength; Using the ratio of deflection to width as the independent variable and the reduction coefficient of ultimate strength as the dependent variable, a nonlinear fitting is performed to obtain the reduction coefficient function; When the target structure is damaged, the ratio of the current deflection to the width of the target structure is obtained, and the ratio of the current deflection to the width is substituted into the reduction coefficient function to obtain the current reduction coefficient; The current residual ultimate strength of the target structure is obtained by multiplying the current reduction factor of the target structure by the complete ultimate strength of the target structure.

2. The method for estimating the structural strength of a damaged ship according to claim 1, characterized in that, When the target structure is a deck, the different damage conditions include different degrees of centrosymmetric deformation and non-centrosymmetric deformation.

3. The method for estimating the structural strength of a damaged ship according to claim 1, characterized in that, The target structure includes multiple structures, each of which is a substructure of the hull structure; the method further includes: When multiple target structures deform, the current reduction coefficients of the multiple target structures are multiplied together to obtain the current reduction coefficient of the hull structure; The current residual ultimate strength of the hull structure is obtained by multiplying the current reduction factor of the hull structure by the complete ultimate strength of the hull structure.

4. The method for estimating the structural strength of a damaged ship according to claim 3, characterized in that, The deformation of multiple target structures can be either joint deformation or independent deformation across regions.

5. The method for estimating the structural strength of a damaged ship according to claim 1, characterized in that, The expression for the reduction coefficient function is: ； in, This is the reduction factor; It is an exponential function; For deformation deflection; denoted as the structural width; A, B, and C are fitting coefficients.

6. The method for estimating the structural strength of a damaged ship according to claim 1, characterized in that, When the target structure is damaged, obtaining the ratio of the current deflection to the width of the target structure includes: When the target structure is damaged due to a maritime accident, the ratio of the current deflection to the width of the target structure is obtained.

7. The method for estimating the structural strength of a damaged ship according to claim 1, characterized in that, The target ship structure includes at least one of hull plating, plate frame structure, and compartment structure.

8. A device for estimating the structural strength of a damaged ship, characterized in that, include: The fitting data acquisition module is used to obtain the ratio of deflection to width of the target structure on the ship under different damage conditions, as well as the reduction factor of the ultimate strength. The fitting module is used to perform nonlinear fitting with the ratio of deflection to width as the independent variable and the reduction coefficient of ultimate strength as the dependent variable to obtain the reduction coefficient function; The current reduction coefficient estimation module is used to obtain the ratio of the current deflection to the width of the target structure when the target structure is damaged, and substitute the ratio of the current deflection to the width into the reduction coefficient function to obtain the current reduction coefficient; The current remaining ultimate strength estimation module is used to multiply the current reduction factor of the target structure by the complete ultimate strength of the target structure to obtain the current remaining ultimate strength of the target structure.

9. An electronic device, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method for estimating the strength of a damaged ship structure as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that, when executed by a processor, implements the method for estimating the structural strength of a damaged ship as described in any one of claims 1 to 7.

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