Design and manufacturing method of pipe joint component of offshore wind power jacket

Abstract

The invention relates to an offshore wind power jacket pipe joint component design and manufacturing method, which comprises the following steps of: establishing a pipe joint parameterized geometric model by taking a deep sea shellfish shell growth mechanism as an initial topological structure; inputting the extreme environmental parameters of the sea area into a pre-constructed GAN model, performing fitting training by a generator in the GAN model, and outputting a gradient material space distribution scheme of jacket pipe nodes; performing optimization processing on the gradient material space distribution scheme based on a multi-target genetic algorithm to obtain an optimal solution of a target stress gradient and material distribution; by utilizing the growth mechanism of a deep-sea shellfish shell, the topological design of the pipe joint is realized, a large number of structural simulation analysis data and parameters are provided, the wall thickness of a steel plate of the pipe joint can be obviously reduced, the stress concentration phenomenon at the pipe joint is changed, the fatigue performance of the joint is improved, and meanwhile, the comprehensive manufacturing cost of the overall structure of the jacket is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore wind power jacket, in particular to a kind of offshore wind power jacket pipe node component design and its manufacturing method. BACKGROUND

[0002] As a new energy, offshore wind power has shown great development potential in promoting the realization of the "double carbon" goal. With the continuous progress of technology and the growing demand, offshore wind power projects are gradually expanding to deep sea, and offshore wind power jacket needs to withstand wind and waves and other harsh environments for two or three decades. The marine environment is very complex, which puts higher requirements on the structural design of offshore wind power jacket.

[0003] As the core foundation structure supporting the wind turbine, offshore wind power jacket needs to cope with extreme harsh and complex environments in deep sea, including violent wind and waves, strong ocean current impact, high pressure seawater corrosion and continuous cyclic loading. Under this harsh service condition, the pipe node of the jacket (i.e. the joint area connecting different pipe fittings) becomes the key to the safety of the entire structure and the most prone to fatigue failure position.

[0004] The traditional jacket structure is formed by cutting and excavating steel pipes and then splicing and welding. Due to stress concentration in the through node area, the through node steel pipe needs to be thickened or the steel strength of the node needs to be improved to ensure the fatigue performance and structural safety of the node. This kind of node requires a large amount of steel, has great manufacturing difficulty, and has large processing deviation. Welding defects are prone to occur during the process of splicing and welding, which poses a risk to the structural safety. Its fatigue performance is facing severe challenges under the high frequency and high intensity cyclic loading in deep sea. According to the measured data, in a certain deep sea area, the average annual encounter of 6-level or above waves is 180 days, and the failure probability of the traditional welded node under 10^6 cyclic loadings is as high as 32%.

[0005] Therefore, breaking through the fatigue performance bottleneck of traditional welded nodes and developing and applying new node technologies with higher fatigue strength, longer crack initiation life and better fracture toughness are the core of improving the robustness of the entire offshore wind power jacket structure. SUMMARY

[0006] In view of the shortcomings of the prior art, the present application provides a kind of offshore wind power jacket pipe node component design and its manufacturing method to solve the above problems.

[0007] The present application provides the following technical solutions: A kind of offshore wind power jacket pipe node component design method, comprising the following steps: Taking the growth mechanism of deep-sea shell as the initial topological structure, a parameterized geometric model of the pipe node is established; The sea area extreme environment parameter is input into a pre-constructed GAN model, fitting training is performed by a generator in the GAN model, and a gradient material space distribution scheme of the jacket pipe node is output; The gradient material space distribution scheme is optimized based on a multi-objective genetic algorithm to obtain an optimal solution of the target stress gradient and material distribution.

[0008] Preferably, the multi-objective genetic algorithm adopts NSGA-III.

[0009] Preferably, the sea area extreme environment parameter includes an extreme wave spectrum, a fan vortex-induced vibration frequency domain feature and a microbial corrosion-fatigue coupling damage model.

[0010] Preferably, the multi-objective genetic algorithm takes the minimum maximum stress concentration coefficient, the maximum stress gradient matching degree and the minimum corrosion sensitive area as the objective function.

[0011] A jacket pipe node component manufacturing method for offshore wind power is manufactured by 3D printing according to the optimal solution output by a jacket pipe node component design method for offshore wind power.

[0012] The present application has the following beneficial technical effects: Based on the structural stress gradient theory, a complete streamlined pipe node component design method is designed, and the pipe node component is manufactured by additive manufacturing combined with modern 3D printing technology, realizing the overall factory assembly of the pipe node component. The welding defects caused by manual splicing and welding in the traditional manufacturing process can be effectively avoided, the pipe node manufacturing and processing quality is improved, and the safety of the overall structure of the jacket is ensured.

[0013] The growth mechanism of deep-sea shell is used to realize the topological design of the pipe node, provide a large amount of structural simulation analysis data and parameters, obviously reduce the steel plate wall thickness of the pipe node, change the stress concentration phenomenon at the pipe node, improve the fatigue performance of the node, and greatly reduce the comprehensive manufacturing cost of the overall structure of the jacket. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic view of the pipe node jacket structure of the present application.

[0015] The reference numerals in the drawing are: 1, jacket main column circular pipe; 2, jacket diagonal bracing circular pipe; 3, jacket pipe node. DETAILED DESCRIPTION

[0016] With reference to the accompanying drawings: the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of the present application.

[0017] As shown in Figure 1 A plurality of jacket tube nodes 3 are connected to the jacket main column tube 1 through the inclined bracing circular tube 2.

[0018] Embodiment one: A method for designing a jacket tube node component of offshore wind power, comprising the following steps: The growth mechanism of deep-sea shellfish (spiral angle of nacre layer) shell is used as the initial topological structure. The shell of deep-sea shellfish realizes stress dispersion and crack arrest through gradient distribution of layered nacre structure and organic matter. A parameterized geometric model of the jacket tube node 3 is established, the stress-driven material deposition rule in shell growth is extracted, and a controllable initial topological model is established.

[0019] The GAN model (generative adversarial network) includes a generation model G and a discrimination model D. The input parameters include: an extreme wave spectrum of a sea area measured database with a 50-year return period, a wind turbine vortex-induced vibration frequency domain feature trained based on SCADA data, and a microbial corrosion-fatigue coupling damage model measured by a marine institute; The input extreme wave spectrum is used to simulate extreme sea state load; the input wind turbine vortex-induced vibration frequency domain feature is used to avoid resonance frequency matching; the input microbial corrosion-fatigue coupling damage model is used to quantify the influence of biological erosion on fatigue life; and the output is a gradient material spatial distribution scheme of the jacket tube node 3.

[0020] Then, a multi-objective genetic algorithm (NSGA-III) is used to optimize the obtained gradient material spatial distribution scheme of the jacket tube node 3. The optimization objectives include: minimizing the maximum stress concentration coefficient, maximizing the stress gradient matching degree, and minimizing the area of the corrosion sensitive area; the constraint conditions include: avoiding the first-order natural frequency from the vortex-induced main frequency band ± 15%, the key node fatigue life > 50 years, etc.; and the Pareto optimal solution (Pareto optimal) of the stress gradient and material distribution is achieved.

[0021] The obtained streamlined node type of the jacket tube node 3 based on the stress gradient theory can significantly reduce the stress concentration phenomenon and improve the fatigue life.

[0022] Through the modern 3D printing manufacturing technology, the conduit rack pipe node designed through the above method is additively manufactured, the processing and manufacturing of the streamline node can be realized, the fatigue performance of the node material is ensured, and the manufacturing cost of the whole structure of the conduit rack is reduced.

[0023] The above-described embodiments only express the specific implementation of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A design method for pipe node components of offshore wind turbine jackets, characterized in that, Includes the following steps: Using the growth mechanism of deep-sea mollusks' shells as the initial topology, a parametric geometric model of the tube node was established. Extreme marine environmental parameters are input into a pre-built GAN model, which is then fitted and trained by the generator in the GAN model, and outputs a gradient material spatial distribution scheme for the pipe nodes of the jacket structure. The gradient material spatial distribution scheme is optimized using a multi-objective genetic algorithm to obtain the optimal solution for the target stress gradient and material distribution.

2. The design method for the pipe node component of an offshore wind turbine jacket as described in claim 1, characterized in that, The multi-objective genetic algorithm used is NSGA-III.

3. The design method for the pipe node component of an offshore wind turbine jacket as described in claim 1, characterized in that, The extreme environmental parameters of the marine area include extreme wave spectrum, frequency domain characteristics of wind turbine vortex-induced vibration, and microbial corrosion-fatigue coupled damage model.

4. The design method for the pipe node component of an offshore wind turbine jacket as described in claim 1, characterized in that, The multi-objective genetic algorithm takes minimizing the maximum stress concentration factor, maximizing the stress gradient matching degree, and minimizing the area of ​​the corrosion-sensitive zone as its objective functions.

5. A method for manufacturing pipe node components for offshore wind turbine jackets, characterized in that, The optimal solution output by the design method for pipe node components of offshore wind turbine jacket as described in any one of claims 1-4 is used to manufacture the pipe node structure by 3D printing.

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