Method and device for confirming allowable phase difference of pile legs for a jack-up platform

Abstract

This application relates to the field of marine engineering equipment technology, and provides a method and device for confirming the allowable phase difference of the legs of a jack-up platform. The method includes: loading finite element models of the jack-up platform in both standing and raised states, each with the same compression elements and node numbers; calculating the structural strength verification coefficients of the compression elements under both conditions; vectorically superimposing the verification coefficients and iteratively adjusting the unit load of the finite element model in the raised state using convergence conditions; and finally solving for the allowable phase difference of the legs based on the convergence results. This invention fills the gap in the prior art where the allowable phase difference of the legs is not set for the platform's standing operation condition, solves the problem of distortion caused by the coupling and superposition of loads under different operating conditions, achieves accurate quantitative solution of the allowable phase difference, improves the safety evaluation system for the leg structure, and enhances the structural safety of jack-up platform operations.

Description

Technical Field

[0001] This application relates to the field of marine engineering equipment technology, and in particular to a method and device for confirming the allowable phase difference of the legs of a jack-up platform. Background Technology

[0002] Jack-up platforms are essential equipment for marine resource development, such as jack-up drilling platforms for oil and gas extraction, jack-up construction platforms for offshore wind power equipment installation, and dedicated jack-up accommodation platforms.

[0003] The phase difference in the legs of a self-elevating platform mainly stems from uneven ground or slippage of the legs during the platform's lifting process, causing the legs to tilt and resulting in a height difference between the three chords of the legs. This height difference causes a large bending moment in the lower guide position of the legs, directly affecting the stress state and structural safety of the legs. However, when the platform is in a standing operation state, the lifting system has switched to the locking mode, and the legs are relatively fixed to the lifting frame. At this time, even if the legs are subjected to various external forces such as environmental loads and crane loads, the phase difference caused by uneven ground or slippage of the legs will not increase further; it will only lead to an increase in the stress within the legs themselves.

[0004] The phase difference between the pile legs is a key structural safety indicator for truss-type pile legs. During the design phase, the allowable value of the pile leg phase difference is typically considered only under favorable environmental conditions during lifting and preloading operations, without setting corresponding allowable phase difference values ​​for the platform's standing working state. For self-elevating platforms, especially wind power installation platforms, the crane load significantly affects the stress state of the pile legs during pile hoisting operations. Therefore, a comprehensive consideration of the pile leg phase difference under various working conditions is necessary to ensure the overall structural safety of the platform. Summary of the Invention

[0005] In view of this, this application provides a method and apparatus for confirming the allowable phase difference of the legs of a self-elevating platform, which can calculate the allowable phase difference of the legs of the self-elevating platform in the standing working state through a finite element model.

[0006] This application provides a method and apparatus for confirming the allowable phase difference of the legs of a jack-up platform. The following description covers several aspects, and the embodiments and beneficial effects described below can be referenced interchangeably.

[0007] In a first aspect, this application provides a method for confirming the allowable phase difference of the legs of a jack-up platform, comprising:

[0008] Load the first finite element model of the self-elevating platform in its standing state and the second finite element model in its lifting state;

[0009] Among them, the first finite element model and the second finite element model have the same number of compression elements and node numbers, and the compression elements are used to simulate the load transfer between different lifting devices and pile legs on the self-elevating platform.

[0010] Based on the first finite element model, the first structural strength analysis index of the compression element is determined when the pile leg is in a standing state and under the applied working load, wherein the first structural strength analysis index includes a first check coefficient.

[0011] Based on the second finite element model, the second structural strength analysis index of the compression element is determined when the pile leg is in a raised state and a unit load is applied to the bottom of the target pile leg. The second structural strength analysis index includes a second check coefficient.

[0012] The first and second verification coefficients of each pressure unit are vector-sumped together to obtain the third verification coefficient;

[0013] The third check coefficient is judged. If the third check coefficient does not meet the convergence condition, the unit load applied to the second finite element model is adjusted, and the second structural strength analysis index is recalculated and the vector addition is re-performed until the convergence condition is met.

[0014] Calculate the allowable phase difference of the pile leg if the third check coefficient meets the convergence condition.

[0015] According to the embodiments of this application, the above-described technical solution of this application has at least one of the following beneficial effects:

[0016] By constructing a first finite element model for standing state and a second finite element model for lifting state with the same compressed elements and node numbers, the technical bottleneck of incompatibility between traditional models for different working conditions and the distortion of load superposition was overcome, and the accurate coupling simulation of standing working load and phase difference additional load was realized.

[0017] Meanwhile, an innovative vector addition and iterative convergence mechanism for structural strength verification coefficients under dual working conditions is adopted to replace the traditional estimation method that relies on design experience. This achieves quantitative and high-precision automated solution of the allowable phase difference of the pile legs, filling the gap in existing technology that does not set allowable phase differences for the platform standing operation state. It effectively avoids the risk of structural damage caused by excessive phase difference and significantly improves the structural safety and operational reliability of the self-elevating platform standing operation.

[0018] In one possible implementation of the first aspect described above, the pressure-bearing unit includes a spring unit and a one-way pressure-bearing unit, and the lifting device includes a lifting gear and upper and lower guides, wherein the spring unit is used to simulate the load transfer between the lifting gear and the pile leg, and the one-way pressure-bearing unit is used to simulate the load transfer between the upper and lower guides and the pile leg.

[0019] According to the embodiments of this application, differentiated unit simulation settings were made for the two completely different force characteristics of the lifting gear and the pile leg, and the upper and lower guides and the pile leg. This avoids the force analysis deviation caused by the simulation of a single compression unit, further improves the calculation accuracy of the structural strength analysis index, and provides a more reliable model basis for the accurate determination of the allowable phase difference.

[0020] In one possible implementation of the first aspect described above, the operational load includes at least one of the crane load, the structural weight of the self-elevating platform, and the environmental load.

[0021] According to the implementation method of this application, the coverage dimension of the working load in the standing state is clarified, which can fully adapt to various typical stress conditions when the platform is standing. It fills the gap in the prior art that does not fully consider the influence of multiple types of loads on the pile leg phase difference during standing operation, and ensures that the calculated allowable phase difference can cover the stress conditions of the platform in the actual operation of the whole scenario.

[0022] In one possible implementation of the first aspect described above, the method further includes:

[0023] Obtain the first simply supported constraint and the first actual stiffness value, wherein the first actual stiffness value is the actual stiffness value of the lifting system on the self-elevating platform after locking;

[0024] The first simply supported constraint is used as the constraint condition for each pile leg in the first finite element model, and the first actual stiffness value is used as the stiffness value of the spring element in the first finite element model to obtain a new first finite element model.

[0025] Based on the new first finite element model, the first structural strength analysis index is obtained.

[0026] According to the implementation method of this application, for the actual working condition of the lifting system locking in the platform standing state, an appropriate simply supported constraint is used as the boundary condition of the pile leg. At the same time, the spring unit parameters are calibrated with the actual stiffness value after locking, which accurately restores the relative fixed state and load transfer characteristics of the pile leg and the platform body in the locking mode. This avoids the deviation of the structural strength analysis in the standing state caused by the distortion of boundary conditions and stiffness parameters, and further improves the calculation accuracy and reliability of the first structural strength analysis index.

[0027] In one possible implementation of the first aspect above, the unit load is either a unit bending moment or a horizontal load.

[0028] According to the implementation method of this application, the type of unit load is defined as unit bending moment or horizontal load that is directly related to the additional force generated by the phase difference of the pile leg. This enables the second finite element model to accurately simulate the additional force state of the pile leg caused by the phase difference, ensuring that the second structural strength analysis index can directly quantify the structural force influence caused by the phase difference, and providing accurate basic data for subsequent load vector addition and allowable value iterative calculation.

[0029] In one possible implementation of the first aspect described above, the method further includes:

[0030] Obtain the second actual stiffness value and the second simply supported constraint, wherein the second actual stiffness value is the actual stiffness value of the lifting system on the self-elevating platform during the lifting phase;

[0031] The second simply supported constraint is used as the constraint condition for the non-target pile leg;

[0032] The second actual stiffness value is used as the stiffness value of the spring element in the second finite element model to obtain a new second finite element model.

[0033] Based on the new second finite element model, the second structural strength analysis index is obtained.

[0034] According to the implementation method of this application, for the actual working condition of the platform lifting state, an adapted simply supported constraint boundary is set for the non-target pile leg. At the same time, the spring element parameters are calibrated with the actual stiffness value of the lifting system during the lifting stage. This accurately restores the actual load transfer characteristics and boundary conditions of the pile leg and the lifting system under the lifting condition, avoiding the calculation deviation caused by the inconsistency between the lifting state model parameters and the actual working condition, and ensuring the simulation accuracy and data reliability of the second structural strength analysis index.

[0035] In one possible implementation of the first aspect above, adjusting the unit load applied to the second finite element model includes:

[0036] The first structural strength analysis index and the second structural strength analysis index are vector-added together to obtain the third structural strength analysis index.

[0037] The load coefficient is obtained based on the first and third structural strength analysis indices.

[0038] The unit load is amplified based on the load factor, and the amplified unit load is applied to the second finite element model.

[0039] According to the implementation method of this application, a quantitative and directional adjustment method for unit load is provided. The load coefficient is obtained by comparing and calculating the structural strength analysis index. Based on the load coefficient, the unit load is accurately amplified, which replaces the random load adjustment method without basis. This greatly improves the convergence efficiency of iterative calculation, while ensuring that each load adjustment can accurately match the structural strength verification requirements, avoiding invalid iterations and effectively shortening the calculation cycle of allowable phase difference.

[0040] In one possible implementation of the first aspect above, the allowable phase difference of the pile leg is calculated, provided that the third verification coefficient satisfies the convergence condition, including:

[0041] If the third verification coefficient satisfies the convergence condition, the first finite element model and the second finite element model are merged to obtain the third finite element model.

[0042] The rack phase difference of each chord on the pile leg is obtained from the third finite element model;

[0043] Based on the phase difference of each rack on the pile leg, the allowable phase difference in the standing working state of the pile leg is determined.

[0044] According to the implementation method of this application, the precise extraction and determination path of the allowable phase difference is clarified. By superimposing the converged finite element model, the rack phase difference of each chord of the pile leg is directly obtained. Finally, the allowable phase difference adapted to the self-elevating platform in the standing working state is quantified, filling the technical gap of the prior art that does not set the allowable phase difference of the pile leg for the self-elevating platform in the standing working condition. At the same time, it ensures that the calculated allowable phase difference can directly correspond to the actual height difference of the pile leg chord and can be directly used for the pile leg status control and structural safety verification of the platform on site.

[0045] Secondly, this application provides a device for calculating the allowable phase difference of the legs of a jack-up platform, comprising:

[0046] The model loading module is used to load the first finite element model of the self-elevating platform in its standing state and the second finite element model in its lifting state.

[0047] Among them, the first finite element model and the second finite element model have the same number of compression elements and node numbers, and the compression elements are used to simulate the load transfer between different lifting devices and pile legs on the self-elevating platform.

[0048] The analysis index calculation module is used to determine the first structural strength analysis index of the compression unit when the pile leg is in a standing state and under the applied working load, based on the first finite element model. The first structural strength analysis index includes a first check coefficient.

[0049] The analysis index calculation module is also used to determine the second structural strength analysis index of the compression unit based on the second finite element model when the pile leg is in the lifting state and a unit load is applied to the bottom of the target pile leg. The second structural strength analysis index includes a second verification coefficient.

[0050] The vector addition module is used to vector-add the first and second verification coefficients of each pressure unit to obtain the third verification coefficient;

[0051] The judgment module is used to judge the third check coefficient. If the third check coefficient does not meet the convergence condition, the unit load applied to the second finite element model is adjusted, and the second structural strength analysis index is recalculated and the vector addition is re-performed until the convergence condition is met.

[0052] The allowable phase difference calculation module is used to calculate the allowable phase difference of the pile leg when the third verification coefficient meets the convergence condition.

[0053] Thirdly, this application provides an electronic device including a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by the processor to implement a method for confirming the allowable phase difference of the legs of a self-elevating platform as disclosed in the first aspect and any possible implementation thereof.

[0054] Fourthly, this application provides a computer-readable storage medium storing at least one instruction or at least one program, wherein the at least one instruction or at least one program is loaded and executed by a processor to implement a method for confirming the allowable phase difference of the legs of a jack-up platform as disclosed in the first aspect and any possible implementation thereof.

[0055] Fifthly, this application provides a computer program product comprising: computer instructions that, when executed on an electronic device, cause the electronic device to perform a method for confirming the allowable phase difference of the legs of a jack-up platform as disclosed in the first aspect and any possible implementation thereof.

[0056] The beneficial effects of the second to fifth aspects can be found in the first aspect and the beneficial effects of any possible implementation of the first aspect, and will not be repeated here. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the allowable phase difference confirmation method for pile legs in an embodiment of this application;

[0058] Figure 2This is a schematic diagram of the overall structure of the first finite element model in the embodiments of this application;

[0059] Figure 3 This is a top view of the first finite element model in the embodiments of this application;

[0060] Figure 4 This is a side view of the first finite element model in the embodiments of this application;

[0061] Figure 5 This is a flowchart of the initialization process of the first finite element model in the embodiments of this application;

[0062] Figure 6 This is a flowchart illustrating the initialization process of the second finite element model in this embodiment of the application.

[0063] Figure 7 This is a flowchart illustrating the unit load adjustment process in the embodiments of this application;

[0064] Figure 8 This is a flowchart illustrating the allowable phase difference calculation in the embodiments of this application;

[0065] Figure 9 This is a block diagram of the electronic device in the embodiments of this application;

[0066] Figure 10 This is a block diagram of a system-on-chip (SoC) in the embodiments of this application.

[0067] Figure label:

[0068] 1. Platform body; 2. Legs; 3. Web members; 4. Chord members; 5. Diagonal braces; 6. Lifting gears; 7. Lower guide; 8. Upper guide. Detailed Implementation

[0069] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0070] The technical problems to be solved by the embodiments of this application will be described below.

[0071] As described in the background technology section above, in the design and control of the phase difference of the pile legs of the self-elevating platform, the allowable value of the phase difference of the pile legs was only set for the lifting and preloading conditions of the self-elevating platform under good environmental conditions. The corresponding allowable value of the phase difference was not set for the standing working state of the self-elevating platform, resulting in a blind spot in the coverage of key working conditions in the safety control of the pile leg structure, and failing to fully guarantee the overall structural safety of the self-elevating platform throughout the entire operation cycle.

[0072] Therefore, to address the aforementioned issues, this application provides a method and apparatus for confirming the allowable phase difference of pile legs in a self-elevating platform. First, two finite element models are loaded, corresponding to both the standing and raised states of the self-elevating platform, each equipped with a compression element to simulate load transfer between the raising device and the pile legs. Then, based on the dual models, structural strength analysis indices, including verification coefficients, are calculated for the pile legs under standing load and bottom unit load. Finally, when the verification coefficients converge, the two models are merged, and the phase difference of each chord rack of the pile leg is read from the combined model to determine the allowable phase difference of the pile leg in its standing working state.

[0073] This technology fills the gap in existing methods for confirming the allowable phase difference of pile legs during standing operation of self-elevating platforms, and improves the full-condition control system for pile leg phase difference. By accurately matching the actual stress state of the platform during standing operation through dual-model coupling calculation, the allowable phase difference suitable for standing operation is quantified. This can effectively control the problems of sudden increase in bending moment and excessive stress at the lower guide position caused by pile leg phase difference, and comprehensively ensure the structural safety of self-elevating platforms, especially wind power installation platforms, during standing operation.

[0074] To better understand the allowable phase difference confirmation method for the legs of a jack-up platform according to the embodiments of this application, the following description is provided in conjunction with the appendix to the specification. Figure 1-8 The methods and apparatus of the embodiments of this application will be described in detail.

[0075] Reference Figure 1-6 , Figure 1 This is a schematic diagram of the allowable phase difference confirmation method for pile legs in an embodiment of this application. Figure 2 This paper shows a schematic diagram of the overall structure of the first finite element model in an embodiment of this application. Figure 3 A top view of the first finite element model in an embodiment of this application is shown. Figure 4 A side view of the first finite element model in an embodiment of this application is shown. Figure 5 The flowchart of the first finite element model initialization in this embodiment of the application is shown. Figure 6 A flowchart of the second finite element model initialization process in an embodiment of this application is shown.

[0076] In this embodiment of the application, a method for confirming the allowable phase difference of the legs of a jack-up platform includes steps S100-S600.

[0077] S100, load the first finite element model of the self-elevating platform in the standing state and the second finite element model in the lifting state.

[0078] like Figure 1 As shown, step S100 above corresponds to step S1, loading the model.

[0079] The first finite element model and the second finite element model have the same number of compression elements and node numbers, and the compression elements are used to simulate the load transfer between different lifting devices and pile legs on the self-elevating platform.

[0080] In some embodiments, the pressure-bearing unit includes a spring unit and a one-way pressure-bearing unit, and the lifting device includes a lifting gear and upper and lower guides, wherein the spring unit is used to simulate the load transfer between the lifting gear and the pile leg, and the one-way pressure-bearing unit is used to simulate the load transfer between the upper and lower guides and the pile leg.

[0081] Understandably, differentiated unit simulation settings were made for the two completely different force characteristics of the lifting gear and the pile leg, and the upper and lower guides and the pile leg: spring units were used to simulate the load transfer between the lifting gear and the pile leg, adapting to the bidirectional force characteristics of gear meshing; unidirectional compression units were used to simulate the load transfer between the upper and lower guides and the pile leg, adapting to the actual force boundary where the guide structure can only transmit pressure.

[0082] This setup accurately reproduces the real force transmission logic between different lifting device components and pile legs, avoiding force analysis deviations caused by single-unit simulation, further improving the calculation accuracy of structural strength analysis indicators, and providing a more reliable model basis for the accurate determination of allowable phase difference.

[0083] like Figures 2-4 As shown, taking the structure of the first finite element model as an example, the first finite element model in this embodiment is a finite element model adapted to the standing working state of the self-elevating platform, which includes the platform body 1 and multiple pile legs 2 that match the actual structural parameters of the self-elevating platform.

[0084] The platform body 1 is equipped with multiple pile legs 2. The pile legs 2 are modeled as a lattice truss structure consisting of vertical chord members 4, horizontal web members 3, and diagonal bracing members 5, in order to accurately reproduce the actual force transmission characteristics of the pile legs 2. Furthermore, a lifting gear 6 and upper and lower guides are provided between the platform body 1 and the pile legs 2. The upper and lower guides include an upper guide 8 and a lower guide 7.

[0085] The lifting gear 6 precisely meshes with the vertical rack on the chord 4. Driven by the rotation of the gear set, it realizes the vertical relative displacement between the platform body 1 and the pile legs 2, completing the core operations of lifting and lowering the platform, inserting and pulling the pile legs, etc. It is the core driving component for the platform to realize the self-elevating function.

[0086] The upper guide 8 and the lower guide 7 are arranged vertically at intervals along the pile legs 2 at the pile leg well of the platform body, and are set around the chord 4 of the truss-type pile legs. During the platform lifting and lowering and the insertion and removal of pile legs, they constrain the horizontal displacement, torsional displacement and tilting of the pile legs 2 and the platform body 1, ensure the precise meshing of the pile legs 2 and the lifting gear, avoid problems such as gear tooth disengagement and uneven load jamming during the lifting process, and ensure the stability and safety of the lifting operation.

[0087] S200, based on the first finite element model, determines the first structural strength analysis index of the compression unit when the pile leg is in a standing state and under applied working load.

[0088] like Figure 1 As shown, step S200 corresponds to step S2, model A1, which calculates the structural strength analysis index of each compression unit of the pile leg under the standing condition of the self-elevating platform.

[0089] In addition to the first verification coefficient, the first structural strength analysis index may also include the force value of each compression unit.

[0090] It should be noted that the specific calculation process for the first structural strength analysis index can be found in existing technologies, and will not be elaborated upon here.

[0091] In some embodiments, the operating load includes at least one of the following: crane load, the structural weight of the self-elevating platform, and environmental load.

[0092] It should be noted that the beneficial effects mentioned above can be referred to, and will not be repeated here.

[0093] like Figure 5 As shown, in some embodiments, after the model is loaded, the first finite element model is initialized, specifically including steps S210-S230.

[0094] S210, obtain the first simply supported constraint and the first actual stiffness value.

[0095] The first actual stiffness value is the actual stiffness value of the lifting system on the self-elevating platform after it is locked.

[0096] It should be noted that the first simply supported constraint is used to lock all translation at the bottom of the pile leg, allowing the pile leg to bend and rotate freely when under force, simulating the actual support state of the pile leg inserted into the seabed, which can rotate slightly but cannot slide.

[0097] S220, the first simply supported constraint is used as the constraint condition for each pile leg in the first finite element model, and the first actual stiffness value is used as the stiffness value of the spring element in the first finite element model to obtain a new first finite element model.

[0098] S230, based on the new first finite element model, yields the first structural strength analysis index.

[0099] Understandably, by using the first simply supported constraint adapted to the locking state as the boundary condition of the pile leg, and calibrating the stiffness parameters of the spring unit with the actual stiffness value after the lifting system is locked, the constraint state, load transmission path and system stiffness characteristics of the pile leg under the locking mode are truly restored. This completely eliminates the strength calculation deviation caused by the distortion of boundary conditions and stiffness parameters, greatly improves the calculation accuracy and reliability of the first structural strength analysis index, and ensures that the force change of the pile leg caused by the working load in the standing state can be accurately captured, providing accurate reference data for the subsequent dual-condition load coupling superposition.

[0100] S300, based on the second finite element model, determines the second structural strength analysis index of the compression element when the pile leg is in a raised state and a unit load is applied to the bottom of the target pile leg.

[0101] like Figure 1 As shown, step S300 corresponds to step S3, model A2, which calculates the structural strength analysis index of each compression unit of the pile leg under the unit load at the bottom of the pile leg.

[0102] In addition to the second verification coefficient, the second structural strength analysis index may also include the stress value of each compression unit.

[0103] It should be noted that the target pile leg is the pile leg where the crane is located. The calculation process for the second structural strength analysis index can refer to existing technology, and will not be elaborated here.

[0104] In some embodiments, the unit load is one of unit bending moment and horizontal load.

[0105] Understandably, the core danger of pile leg phase difference lies in the fact that the difference in chord height will cause additional bending moment and horizontal load on the pile leg, which will lead to excessive stress at key locations. Existing technologies often use load forms that do not match the additional force characteristics of phase difference in simulation, which cannot accurately reproduce the real force impact of phase difference on pile leg structure. As a result, the results of subsequent superposition calculations cannot truly reflect the correlation between phase difference and pile leg strength.

[0106] This application clarifies that the unit load is the unit bending moment or horizontal load directly corresponding to the additional force caused by the phase difference. This allows the loading conditions of the second finite element model to accurately reproduce the additional force state of the pile leg caused by the phase difference. It ensures that the calculated second structural strength analysis index can directly and accurately quantify the force change of the pile leg structure caused by the unit phase difference. This provides a physically meaningful and numerically accurate basic data for the subsequent vector superposition of dual-condition loads and iterative solution of the allowable phase difference, ensuring the accuracy of the allowable phase difference calculation results from the source of loading.

[0107] like Figure 6 As shown, in some embodiments, after the model is loaded, the second finite element model is initialized, specifically including steps S240-S260.

[0108] S240 is used to obtain the second actual stiffness value and the second simply supported constraint.

[0109] It should be noted that the second actual stiffness value is the actual stiffness value of the lifting system on the self-elevating platform during the lifting phase.

[0110] S250, the second simply supported constraint is used as the constraint condition for the non-target pile leg.

[0111] It should be noted that the function of the second simply supported constraint can be found in the section on the first simply supported constraint above, and will not be repeated here.

[0112] S260, the second actual stiffness value is used as the stiffness value of the spring element in the second finite element model to obtain a new second finite element model. Based on the new second finite element model, the second structural strength analysis index is obtained.

[0113] Understandably, for the specific working condition of the platform lifting phase, a second simply supported constraint boundary adapted to the lifting process is set for the non-target pile leg. At the same time, the spring element parameters are calibrated with the actual stiffness value of the lifting system during the lifting phase. This accurately restores the real working state of the target pile leg under the lifting condition, the stability constraint of the non-target pile leg, and the load transfer stiffness characteristics of the lifting system and the pile leg during the lifting process. This completely avoids the calculation deviation caused by the mismatch of working conditions and unreasonable boundary condition settings, and greatly improves the simulation accuracy and data reliability of the second structural strength analysis index, laying a solid foundation for the accurate coupling and superposition of subsequent dual working condition loads.

[0114] S400, the first and second verification coefficients of each pressure unit are vector-added together to obtain the third verification coefficient.

[0115] like Figure 1 As shown, step S400 corresponds to step S4, which calculates the structural strength analysis index of each compression unit of the pile leg under standing load and bottom unit load.

[0116] S500, judge the third check coefficient. If the third check coefficient does not meet the convergence condition, adjust the unit load applied to the second finite element model, recalculate the second structural strength analysis index and re-add vectors until the convergence condition is met.

[0117] like Figure 1 As shown, step S500 corresponds to step S5. First, it is determined whether the verification coefficient is equal to 1. If it is not equal to 1, the load coefficient is calculated. Based on the load coefficient, the unit load of model A2 is amplified, and the structural strength analysis index of each compression unit of the pile leg in model A2 is recalculated. Finally, based on the structural strength analysis index output by model A1 and the structural strength analysis index output by the amplified model A2, the structural strength analysis index of each compression unit of the pile leg under the standing load and bottom unit load is recalculated.

[0118] It is understandable that the above convergence condition is to determine whether the third check coefficient is 1. The convergence condition can also be adjusted according to actual needs. This paper does not limit the convergence condition.

[0119] S600, based on the third check coefficient when the convergence condition is met, the allowable phase difference of the pile leg is obtained.

[0120] like Figure 1 As mentioned above, step S600 corresponds to step S6, which calculates the allowable phase difference in the standing working state of the pile leg.

[0121] Therefore, compared with the prior art, the allowable phase difference confirmation method for pile legs of self-elevating platforms provided in this application embodiment loads a first finite element model of the self-elevating platform in a standing state and a second finite element model in a raised state with the same compression element and node number. The structural strength check coefficients corresponding to the compression elements under the two working conditions are calculated respectively. After the check coefficients are vector-summed, the unit load is iteratively adjusted based on the preset convergence condition. Finally, the allowable phase difference of the pile legs is obtained based on the converged check coefficients.

[0122] This solution fills the industry gap in existing technologies that do not specify allowable phase differences for the legs of self-elevating platforms in standing operation mode. It solves the technical problem of load superposition distortion under different working conditions by using coupled design of dual finite element models from the same source. It replaces the traditional empirical prediction method with iterative convergent quantitative solution, improves the safety evaluation system of the leg structure of self-elevating platforms under all working conditions, effectively avoids the risk of structural damage caused by excessive leg phase difference, and significantly improves the structural safety and operational reliability of the platform in standing operation.

[0123] To facilitate understanding of the allowable phase difference confirmation method for pile legs of a self-elevating platform in the embodiments of this application, the following is combined with... Figure 7-8 The above steps S500-S600 are explained in detail.

[0124] refer to Figure 7 , Figure 7 A flowchart illustrating the unit load adjustment process in an embodiment of this application is shown.

[0125] like Figure 7 As shown, in this embodiment of the application, adjusting the unit load applied to the second finite element model includes steps S510-S530.

[0126] In S510, the first structural strength analysis index and the second structural strength analysis index are vector-added together to obtain the third structural strength analysis index.

[0127] S520, based on the first structural strength analysis index and the third structural strength analysis index, the load factor is obtained.

[0128] The expression for calculating the load factor is as follows:

[0129]

[0130] k is the load factor, a is the second structural strength analysis index, and c is the first structural strength analysis index.

[0131] S530 amplifies the unit load based on the load factor and applies the amplified unit load to the second finite element model.

[0132] Understandably, by quantitatively comparing structural strength analysis indicators, a precise load factor is calculated. Based on the load factor, the unit load is amplified in a directional manner, so that each load adjustment can accurately match the verification requirements of the pile leg structure strength. This completely replaces the traditional blind adjustment method without any basis, greatly improves the convergence efficiency of iterative calculation, significantly reduces the number of invalid iterations, effectively shortens the overall calculation cycle of the allowable phase difference, and at the same time ensures the stability of the iterative solution process and the accuracy of the final result, ensuring that the allowable phase difference obtained can accurately fit the safe critical state of the pile leg structure strength.

[0133] refer to Figure 8 , Figure 8 A flowchart illustrating the allowable phase difference calculation in an embodiment of this application is shown.

[0134] like Figure 8 As shown, in this embodiment of the application, the allowable phase difference of the pile leg is obtained when the third verification coefficient meets the convergence condition, including steps S610-S630.

[0135] In S610, if the third verification coefficient satisfies the convergence condition, the first finite element model and the second finite element model are merged to obtain the third finite element model.

[0136] It should be noted that since the compression elements and node numbers of the first and second finite element models correspond one-to-one, the two models can be directly merged into one using existing modeling software.

[0137] S620, obtain the rack phase difference of each chord on the pile leg from the third finite element model.

[0138] S630 determines the allowable phase difference of the pile leg in the standing working state based on the phase difference of each rack on the pile leg.

[0139] In this embodiment of the application, the formula for calculating the allowable phase difference is as follows:

[0140]

[0141] Where RPD is the allowable phase difference, and RPV is... i RPV represents the rack phase difference of the i-th chord on the pile leg. j Let be the rack phase difference of the j-th chord on the pile leg.

[0142] Understandably, based on the convergence condition of the third verification coefficient, a coupled third finite element model is obtained by combining the dual-condition finite element models. The rack phase difference of each chord of the pile leg is directly extracted from the model, and finally the allowable phase difference adapted to the self-elevating platform in the standing working state is accurately quantified. This completely fills the industry gap that the existing technology has not set the allowable phase difference of the pile leg for the standing operation of the platform. At the same time, it realizes the direct correspondence between the structural strength simulation results and the on-site operation control indicators. The obtained allowable phase difference can be directly used for pile leg status monitoring, safety threshold control and risk warning in the on-site operation of the platform. It effectively avoids the risk of structural damage caused by the pile leg exceeding the phase difference standard, and significantly improves the structural safety and control operability of the platform in the standing operation.

[0143] Secondly, this application provides a device for calculating the allowable phase difference of the legs of a jack-up platform, comprising:

[0144] The model loading module is used to load the first finite element model of the self-elevating platform in its standing state and the second finite element model in its lifting state.

[0145] Among them, the first finite element model and the second finite element model have the same number of compression elements and node numbers, and the compression elements are used to simulate the load transfer between different lifting devices and pile legs on the self-elevating platform.

[0146] The analysis index calculation module is used to determine the first structural strength analysis index of the compression unit when the pile leg is in a standing state and under the applied working load, based on the first finite element model. The first structural strength analysis index includes a first check coefficient.

[0147] The analysis index calculation module is also used to determine the second structural strength analysis index of the compression unit based on the second finite element model when the pile leg is in the lifting state and a unit load is applied to the bottom of the target pile leg. The second structural strength analysis index includes a second verification coefficient.

[0148] The vector addition module is used to vector-add the first and second verification coefficients of each pressure unit to obtain the third verification coefficient;

[0149] The judgment module is used to judge the third check coefficient. If the third check coefficient does not meet the convergence condition, the unit load applied to the second finite element model is adjusted, and the second structural strength analysis index is recalculated and the vector addition is re-performed until the convergence condition is met.

[0150] The allowable phase difference calculation module is used to calculate the allowable phase difference of the pile leg when the third verification coefficient meets the convergence condition.

[0151] In the apparatus of this application embodiment, each module executes the method of the above embodiment, and its specific functions and corresponding technical effects can be referred to the above embodiment. Figures 1-8 The methods explained will not be repeated here.

[0152] This application provides an electronic device, which includes a processor and a memory. The memory stores at least one instruction or at least one program. When the processor loads and executes the instruction or program, the electronic device performs the allowable phase difference confirmation method for the legs of a jack-up platform described in the above embodiments. Its specific functions and corresponding technical effects can be found in the above embodiments. Figure 1 - Figure 8 The method for confirming the allowable phase difference of the legs for jack-up platforms, as explained above, will not be repeated here.

[0153] The following is combined Figure 9 The electronic devices described in the embodiments of this application will be described in detail.

[0154] refer to Figure 9The diagram shows a block diagram of an electronic device 1200 according to one embodiment of this application. The electronic device 1200 may include one or more processors 1201 coupled to a controller hub 1203. In at least one embodiment, the controller hub 1203 communicates with the processor 1201 via a multi-branch bus such as a front side bus (FSB) 1210, a point-to-point interface such as a quick path interconnect (QPI), or a similar connection. The processor 1201 executes instructions controlling general types of data processing operations. In one embodiment, the controller hub 1203 includes, but is not limited to, a graphics memory controller hub (GMCH) (not shown) and an input / output hub (IOH) (which may be on a separate chip) (not shown), wherein the GMCH includes memory and a graphics controller and is coupled to the IOH.

[0155] Electronic device 1200 may also include a coprocessor 1202 and a memory 1204 coupled to a controller hub 1203. Alternatively, one or both of the memory and the GMCH may be integrated within the processor (as described in this application), with memory 1204 and coprocessor 1202 directly coupled to processor 1201 and controller hub 1203, which resides on a single chip with the IOH. Memory 1204 may be, for example, dynamic random access memory (DRAM), phase change memory (PCM), or a combination of both. In one embodiment, coprocessor 1202 is a dedicated processor, such as, for example, a high-throughput MIC (many integerized core) processor, a network or communication processor, a compression engine, a graphics processor, a general-purpose computing on GPU (GPGPU), or an embedded processor, etc. Optional properties of coprocessor 1202 are indicated by dashed lines. Figure 9 middle.

[0156] As a computer-readable storage medium, memory 1204 may include one or more tangible, non-transitory computer-readable media for storing data and / or instructions. For example, memory 1204 may include any suitable non-volatile memory such as flash memory and / or any suitable non-volatile storage device such as one or more hard-disk drives (HDDs), one or more compact disc (CD) drives, and / or one or more digital versatile disc (DVD) drives.

[0157] In one embodiment, electronic device 1200 may further include a network interface controller (NIC) 1206. Network interface 1206 may include a transceiver for providing a radio interface for electronic device 1200 to communicate with any other suitable device, such as a front-end module, antenna, etc. In various embodiments, network interface 1206 may be integrated with other components of electronic device 1200. Network interface 1206 can implement the functions of the communication unit in the above embodiments.

[0158] Electronic device 1200 may further include input / output (I / O) device 1205. I / O device 1205 may include: a user interface designed to enable a user to interact with electronic device 1200; a peripheral component interface designed to enable peripheral components to also interact with electronic device 1200; and / or sensors designed to determine environmental conditions and / or location information related to electronic device 1200.

[0159] It is worth noting that, Figure 9 This is merely an example. That is, although... Figure 9 The electronic device 1200 shown includes multiple devices such as a processor 1201, a coprocessor 1202, a controller hub 1203, and a memory 1204. However, in practical applications, devices using the methods of this application may include only a portion of the devices in the electronic device 1200. For example, it may include only the processor 1201 and the network interface 1206. Figure 9 The properties of the optional devices are shown in dashed lines. According to some embodiments of this application, the memory 1204, which is a computer-readable storage medium, stores instructions or programs that, when executed on a computer, perform the allowable phase difference confirmation method for the legs of a jack-up platform described in the above embodiments. Specific details can be found in the methods described in the above embodiments, and will not be repeated here.

[0160] Now for reference Figure 10The diagram shown is a block diagram of a system-on-chip (SoC) 1300 according to an embodiment of this application. Figure 10 In the diagram, similar components share the same reference numerals. Additionally, dashed boxes are an optional feature for more advanced SoCs. Figure 10 In this SoC 1300, the following are included: an interconnect unit 1350 coupled to an application processor 1310; a system proxy unit 1380; a bus controller unit 1390; an integrated memory controller unit 1340; a group or one or more coprocessors 1320, which may include integrated graphics logic, an image processor, an audio processor, and a video processor; a static random access memory (SRAM) unit 1330; and a direct memory access (DMA) unit 1360. In one embodiment, the coprocessor 1320 includes a dedicated processor, such as, for example, a network or communication processor, a compression engine, a GPGPU, a high-throughput MIC processor, or an embedded processor.

[0161] The static random access memory (SRAM) cell 1330 may include one or more computer-readable media for storing data and / or instructions. The computer-readable storage medium may store instructions, specifically, temporary and permanent copies of those instructions. These instructions may include, when executed by at least one unit in the processor, causing the SoC 1300 to perform the leg allowable phase difference confirmation method for a self-elevating platform according to the above embodiments, as detailed in the methods described in the above embodiments, which will not be repeated here.

[0162] This application provides a computer-readable storage medium storing at least one instruction or at least one program. The instruction or program is loaded and executed by a processor to implement the allowable phase difference confirmation method for pile legs of a self-elevating platform described in the above embodiments. Its specific functions and corresponding technical effects can be found in the above embodiments. Figures 1-8 The method for confirming the allowable phase difference of the legs for jack-up platforms, as explained above, will not be repeated here.

[0163] This application provides a computer program product, including computer instructions. When the computer instructions are executed on an electronic device, the electronic device causes the electronic device to implement the allowable phase difference confirmation method for pile legs of a jack-up platform described in the above embodiments. Its specific functions and corresponding technical effects can be found in the above embodiments. Figures 1-8 The method for confirming the allowable phase difference of the legs for jack-up platforms, as explained above, will not be repeated here.

[0164] Various embodiments of the mechanisms disclosed in this application can be implemented in hardware, software, firmware, or combinations of these implementation methods. Embodiments of this application can be implemented as computer programs or program code executable on a programmable system, the programmable system including at least one processor, a storage system (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device.

[0165] Program code can be applied to input instructions to execute the functions described in this application and generate output information. The output information can be applied to one or more output devices in a known manner. For the purposes of this application, the processing system includes any system having a processor such as, for example, a digital signal processor (DSP), a microcontroller, an application-specific integrated circuit (ASIC), or a microprocessor.

[0166] The program code can be implemented using a high-level procedural language or an object-oriented programming language to communicate with the processing system. Assembly language or machine language can also be used when needed. In fact, the mechanisms described in this application are not limited to any particular programming language. In either case, the language can be a compiled language or an interpreted language.

[0167] In some cases, the disclosed embodiments may be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments may also be implemented as instructions carried or stored thereon on one or more temporary or non-temporary machine-readable (e.g., computer-readable) storage media, which may be read and executed by one or more processors. For example, the instructions may be distributed via a network or through other computer-readable media. Therefore, machine-readable media may include any mechanism for storing or transmitting information in a machine-readable (e.g., computer-readable) form, including but not limited to floppy disks, optical disks, CD-ROMs, compact disc read-only memory (CD-ROMs), magneto-optical disks, read-only memory (ROM), random access memory (RAM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), magnetic cards or optical cards, flash memory, or tangible machine-readable storage for transmitting information (e.g., carrier waves, infrared signals, digital signals, etc.) using the Internet in the form of electrical, optical, acoustic, or other forms of propagated signals. Therefore, machine-readable media include any type of machine-readable medium suitable for storing or transmitting electronic instructions or information in a machine-readable (e.g., computer-readable) form.

[0168] In the accompanying drawings, some structural or methodological features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be necessary. Rather, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the accompanying drawings. Furthermore, including structural or methodological features in a particular figure does not imply that such features are required in all embodiments, and in some embodiments, these features may be omitted or may be combined with other features.

[0169] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, specific embodiments have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in a different order than that shown in the embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0170] It should be noted that all units / modules mentioned in the device embodiments of this application are logical units / modules. Physically, a logical unit / module can be a physical unit / module, a part of a physical unit / module, or a combination of multiple physical units / modules. The physical implementation of these logical units / modules themselves is not the most important factor; the combination of functions implemented by these logical units / modules is the key to solving the technical problems proposed in this application. Furthermore, to highlight the innovative aspects of this application, the above-described device embodiments of this application have not introduced units / modules that are not closely related to solving the technical problems proposed in this application. This does not mean that the above-described device embodiments do not contain other units / modules.

[0171] It should be noted that in the examples and description of this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0172] Although this application has been illustrated and described with reference to certain preferred embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made thereto without departing from the spirit and scope of this application.

Claims

1. A method for confirming the allowable phase difference of the legs of a jack-up platform, characterized in that, include: Load the first finite element model of the self-elevating platform in its standing state and the second finite element model in its lifting state; The first finite element model and the second finite element model have the same number of compression elements and nodes, and the compression elements are used to simulate the load transfer between different lifting devices and pile legs on the self-elevating platform. Based on the first finite element model, the first structural strength analysis index of the compression unit is determined when the pile leg is in a standing state and under the applied working load, wherein the first structural strength analysis index includes a first verification coefficient; Based on the second finite element model, the second structural strength analysis index of the compression unit is determined when the pile leg is in a raised state and a unit load is applied to the bottom of the target pile leg. The second structural strength analysis index includes a second verification coefficient. The first and second verification coefficients of each of the pressure-bearing units are vector-added to obtain the third verification coefficient; The third verification coefficient is judged. If the third verification coefficient does not meet the convergence condition, the unit load applied to the second finite element model is adjusted, and the second structural strength analysis index is recalculated and the vector addition is re-performed until the convergence condition is met. If the third verification coefficient satisfies the convergence condition, the allowable phase difference of the pile leg is calculated.

2. The method according to claim 1, characterized in that, The pressure-bearing unit includes a spring unit and a one-way pressure-bearing unit, and the lifting device includes a lifting gear and upper and lower guides. The spring unit is used to simulate the load transfer between the lifting gear and the pile leg, and the one-way pressure-bearing unit is used to simulate the load transfer between the upper and lower guides and the pile leg.

3. The method according to claim 1, characterized in that, The operating load includes at least one of the following: crane load, the structural weight of the self-elevating platform, and environmental load.

4. The method according to claim 2, characterized in that, The method further includes: Obtain the first simply supported constraint and the first actual stiffness value, wherein the first actual stiffness value is the actual stiffness value of the lifting system on the self-elevating platform after it is locked. The first simply supported constraint is used as the constraint condition for each of the pile legs in the first finite element model, and the first actual stiffness value is used as the stiffness value of the spring element in the first finite element model to obtain a new first finite element model. Based on the new first finite element model, the first structural strength analysis index is obtained.

5. The method according to claim 1, characterized in that, The unit load is either a unit bending moment or a horizontal load.

6. The method according to claim 2, characterized in that, The method further includes: Obtain the second actual stiffness value and the second simply supported constraint, wherein the second actual stiffness value is the actual stiffness value of the lifting system on the self-elevating platform during the lifting phase; The second simply supported constraint is used as the constraint condition for the non-target pile leg; The second actual stiffness value is used as the stiffness value of the spring element in the second finite element model to obtain a new second finite element model; Based on the new second finite element model, the second structural strength analysis index is obtained.

7. The method according to claim 1, characterized in that, The adjustment of the unit load applied to the second finite element model includes: The first structural strength analysis index and the second structural strength analysis index are vector-added to obtain the third structural strength analysis index; Based on the first structural strength analysis index and the third structural strength analysis index, the load coefficient is obtained; The unit load is amplified based on the load coefficient, and the amplified unit load is applied to the second finite element model.

8. The method according to claim 1, characterized in that, The calculation of the allowable phase difference of the pile leg, under the condition that the third verification coefficient satisfies the convergence condition, includes: If the third verification coefficient satisfies the convergence condition, the first finite element model and the second finite element model are merged to obtain the third finite element model; The rack phase difference of each chord on the pile leg is obtained from the third finite element model; Based on the phase difference of each rack on the pile leg, the allowable phase difference of the pile leg in the standing working state is determined.

9. A device for calculating the allowable phase difference of the legs of a jack-up platform, characterized in that, include: The model loading module is used to load the first finite element model of the self-elevating platform in its standing state and the second finite element model in its lifting state. The first finite element model and the second finite element model have the same number of compression elements and nodes, and the compression elements are used to simulate the load transfer between different lifting devices and pile legs on the self-elevating platform. The analysis index calculation module is used to determine the first structural strength analysis index of the compression unit of the pile leg in the standing state and under the condition of applying working load based on the first finite element model, wherein the first structural strength analysis index includes a first verification coefficient. The analysis index calculation module is also used to determine, based on the second finite element model, the second structural strength analysis index of the compression unit when the pile leg is in a raised state and a unit load is applied to the bottom of the target pile leg, wherein the second structural strength analysis index includes a second verification coefficient. The vector addition module is used to vector-add the first verification coefficient and the second verification coefficient of each of the pressure-bearing units to obtain the third verification coefficient; The judgment module is used to judge the third verification coefficient. If the third verification coefficient does not meet the convergence condition, the unit load applied to the second finite element model is adjusted, and the second structural strength analysis index is recalculated and the vector addition is re-performed until the convergence condition is met. The allowable phase difference calculation module is used to calculate the allowable phase difference of the pile leg when the third verification coefficient satisfies the convergence condition.

10. An electronic device, characterized in that, The electronic device includes a processor and a memory, the memory storing at least one instruction or at least one program, the at least one instruction or the at least one program being loaded and executed by the processor to implement the leg allowable phase difference confirmation method for a jack-up platform as described in any one of claims 1 to 8.

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