A method for designing submarine structures based on the bionic characteristics of the peregrine falcon's hydrodynamics

Abstract

This invention provides a method for designing a submarine structure based on the biomimetic characteristics of the peregrine falcon's hydrodynamics. The submarine structure retains the traditional internal structure of a submarine pipeline, but the outermost concrete counterweight layer (5) is modified from its circular shape to a streamlined design that mimics the peregrine falcon's body shape. This streamlined design features a smooth exterior contour and a surface covered with honeycomb-like holes, free of large undulations and sharp corners, effectively reducing fluid resistance. The submarine structure comprises, radially from the inside out, a steel pipe (1), an anti-corrosion insulation layer (2), a thermal insulation layer (3), a casing (4), a concrete protective layer (5), and a honeycomb structure (6). Through the technical solutions of this invention, this method optimizes the hydrodynamic performance of the submarine structure, significantly reducing the impact of hydrodynamic impact loads on the structure. It also demonstrates comprehensive protection against environmental loads such as submarine landslides, undercurrent scour, and sand wave migration. This method has broad application prospects and is suitable for a variety of marine engineering structures.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering technology, and in particular to a method for designing a seabed structure based on the bionic characteristics of the peregrine falcon's fluid dynamics. Background Art

[0002] In marine engineering, subsea structures such as oil and gas pipelines, communication cables, and deep-sea drilling platforms are constantly subjected to the complex marine environment. Marine hydrodynamic impact loads are a key threat to structural safety, especially under strong winds, waves, currents, or extreme weather conditions. These loads can not only cause local deformation, fatigue damage, distortion, and even failure, but in severe cases, can even cause overall structural instability and collapse, leading to major accidents such as oil and gas leaks and communication interruptions. Traditional design methods primarily address these loads by increasing structural strength or using shock absorbers, but these methods often increase construction cost and complexity.

[0003] Peregrine falcons exhibit remarkable hydrodynamic properties in nature. As the fastest diving bird on Earth, their body structure effectively reduces air resistance and maintains stability while diving for prey at speeds exceeding 320 km / h. Inspired by these hydrodynamic characteristics, this paper proposes a biomimetic design method that significantly reduces ocean hydrodynamic impact loads by optimizing the shape and surface features of subsea structures. Summary of the Invention

[0004] In order to make up for the shortcomings of the existing technology, the present invention provides a submarine structure design method based on the bionic characteristics of the peregrine falcon's fluid dynamics, specifically a submarine structure design method for reducing ocean hydrodynamic impact loads based on the bionic peregrine falcon's fluid dynamics characteristics. By imitating the peregrine falcon's body shape and surface characteristics, the fluid dynamic performance of the submarine structure is optimized, thereby reducing the impact of the hydrodynamic impact load on the structure.

[0005] The present invention is achieved through the following technical solution: a method for designing a submarine structure based on the bionic characteristics of the peregrine falcon's fluid dynamics, specifically comprising the following steps:

[0006] Step S1: Structural shape optimization:

[0007] Based on the body shape of the peregrine falcon, the design of the seabed structure is streamlined, specifically:

[0008] The front end of the submarine structure is designed as a smooth arc, similar to the head of a peregrine falcon; the main part of the submarine structure is designed as a gradually narrowing streamline, similar to the body of a peregrine falcon. The main part of the submarine structure uses the principle of the pressure difference between the upper and lower surfaces when the peregrine falcon is in flight. The upper smooth arc surface reduces the impact energy of high-speed water flow, while the enhanced curvature of the lower part guides the water flow through quickly, forming a longitudinal pressure gradient.

[0009] The streamlined shape of the submarine structure consists of two parts: the upper part is composed of two quarter ellipses of different sizes, and the lower part is a semi-ellipse. The mathematical expressions of the semi-ellipse and quarter-ellipse cross-sectional outlines are as follows:

[0010]

[0011] Wherein, y is the longitudinal coordinate of the outer contour of the submarine structure. The longitudinal axis used by y1 is 400 mm away from the longitudinal axes used by y2 and y3, that is, O1O2=400 mm, and the unit is mm; x is the normal coordinate of the outer contour of the submarine structure, and the unit is mm; a and b are the major and minor semi-axes of the ellipse used for the outer contour of the submarine structure, and the unit is mm;

[0012] The calculation expression of the geometric center (centroid) of the submarine structure section is as follows:

[0013]

[0014] in, is the horizontal coordinate of the geometric center, is the vertical coordinate of the geometric center, in mm, x i , y i is the coordinate of the i-th point inside the geometry, in mm;

[0015] Step S2: Surface feature optimization:

[0016] Mimicking the microstructure of peregrine falcon feathers, tiny concave-convex textures or grooves are designed on the surface of the seabed structure. Specifically:

[0017] The main surface of the submarine structure is covered with a honeycomb hole structure, which is a circular concave hole. Two steel pipes with diameters of 700mm and 600mm are built into the submarine structure. The diameter of each honeycomb hole structure is 100mm and the concave depth is 20mm.

[0018] Step S3: Material selection:

[0019] The outside of the steel pipe is tightly covered with an anti-corrosion insulation layer, which has a ring structure. The outside of the anti-corrosion insulation layer is wrapped with a thermal insulation layer, which has a ring structure. The outside of the thermal insulation layer is covered with a casing. The submarine structure uses concrete material to form a concrete protective layer wrapped around the outside of the casing.

[0020] As a preferred solution, the anti-corrosion insulation layer is made of a composite polymer material, and the outer surface is coated with a chemical coating.

[0021] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0022] (1) Through bionic design, the hydrodynamic impact load of the submarine structure is significantly reduced, the generation of turbulence and vortex is reduced, and the stability and durability of the structure are improved.

[0023] (2) It reduces the use of traditional shock-absorbing devices, reduces construction costs and maintenance difficulties, and is suitable for a variety of marine engineering structures.

[0024] (3) It is applicable to a variety of marine engineering scenarios, including but not limited to: submarine oil and gas pipelines; deep-sea drilling platform infrastructure; submarine communication and power cable protection structures; marine observation equipment support platforms, etc.; and has broad application prospects.

[0025] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0027] Figure 1 A schematic cross-section of the submarine structure designed for the present invention, showing the streamlined shape and surface features;

[0028] Figure 2 It is a cross-sectional view of the submarine structure;

[0029] Figure 3 This is the flow field distribution map of the seabed structure;

[0030] Figure 4 This is a comparison between the appearance of the seabed structure and the morphology of the peregrine falcon;

[0031] Figure 5 Schematic diagram of the geometric center position of the seabed structure cross section. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0034] The following combination Figures 1 to 5 The submarine structure design method based on the peregrine falcon fluid dynamics bionic characteristics of the embodiment of the present invention is described in detail.

[0035] like Figure 1 As shown, the present invention proposes a submarine structure design method based on the bionic characteristics of the peregrine falcon's fluid dynamics, which is characterized by specifically comprising the following steps:

[0036] Step S1: Structural shape optimization:

[0037] Based on the body shape of the peregrine falcon, the design of the submarine structure is streamlined, specifically:

[0038] The front end of the submarine structure is designed with a smooth arc, similar to the head of a peregrine falcon, to reduce resistance when impacted by water flow. The main part of the submarine structure is designed with a gradually narrowing streamline, similar to the body of a peregrine falcon, to reduce the possibility of vortex generation. The main part of the submarine structure uses the principle of the pressure difference between the upper and lower surfaces when the peregrine falcon flies. The upper gentle arc surface reduces the impact energy of high-speed water flow, while the enhanced curvature of the lower part guides the water flow through quickly, forming a longitudinal pressure gradient.

[0039] The streamlined shape of the submarine structure consists of two parts: the upper part is composed of two quarter ellipses of different sizes, and the lower part is a semi-ellipse. The mathematical expressions of the semi-ellipse and quarter-ellipse cross-sectional outlines are as follows:

[0040]

[0041] Among them, y is the longitudinal coordinate of the outer contour of the submarine structure. The longitudinal axis used by y1 is 400 mm away from the longitudinal axes used by y2 and y3, that is, O1O2=400 mm, and the unit is mm; x is the normal coordinate of the outer contour of the submarine structure, and the unit is mm; a and b are the major and minor semi-axes of the ellipse used for the outer contour of the submarine structure, and the unit is mm, see Figure 2 ;

[0042] The calculation expression of the geometric center (centroid) of the submarine structure section is as follows:

[0043]

[0044] in, is the horizontal coordinate of the geometric center, is the vertical coordinate of the geometric center, in mm, x i , y i is the coordinate of the i-th point inside the geometry, in mm; Figure 5 As shown in the figure, the calculated geometric center coordinates are (1063.75 mm, 460.56 mm).

[0045] The streamlined design of the subsea structure proposed in this invention takes into account current energy pipeline structures and engineering design specifications. This streamlined design is applied to the outermost concrete counterweight layer of the subsea structure, while leaving the internal layers unchanged. This maintains the existing technical requirements for energy transmission capacity, thermal insulation, and other related processes, minimizing the impact of the streamlined design on the current project. Furthermore, the geometric center of the subsea structure is positioned above the center of gravity, creating a dual mechanism of restoring torque and hydrodynamic load reduction, optimizing structural stability and ensuring greater stability, safety, and adaptability to construction during long-term underwater service.

[0046] Step S2, surface feature optimization: Imitating the microstructure of peregrine falcon feathers, tiny concave-convex textures or grooves are designed on the surface of the seabed structure, specifically:

[0047] The main surface of the submarine structure is covered with a honeycomb hole structure. The honeycomb hole structure is a circular concave hole. The surface area of ​​the submarine pipeline covered with honeycomb holes is larger, and the contact and bite degree with the seabed are more complete. The submarine structure is built with two steel pipes with diameters of 700mm and 600mm respectively. Each honeycomb hole structure has a diameter of 100mm and a concave depth of 20mm.

[0048] Step S3: Material selection:

[0049] High-strength, corrosion-resistant composite materials are used to ensure the long-term stability of the structure in the marine environment while reducing the weight of the structure. Specific features include:

[0050] The steel pipe 1 is the core transmission carrier of the submarine pipeline. It is made of high-strength alloy steel and constitutes the innermost structure of the submarine pipeline. It is mainly used to transport media such as oil, natural gas, oil and gas mixture, and water.

[0051] The outer surface of the steel pipe 1 is tightly wrapped with an anti-corrosion insulation layer 2. This layer, in a toroidal shape, is made of a composite polymer material and coated with a chemical coating. This composite polymer material forms a dense protective barrier through a dual mechanism of chemical coating and physical barrier properties. This special chemical coating effectively resists corrosion from corrosive media such as chloride ions and microorganisms in seawater. Furthermore, its excellent insulation properties prevent electrochemical corrosion, thus comprehensively protecting the steel pipe 1 from operation and significantly extending the service life of the submarine pipeline. The outer surface of the anti-corrosion insulation layer 2 is wrapped with an insulating layer 3, in a toroidal shape. This insulating layer 3, made of high-efficiency thermal insulation material, maintains a stable temperature for the transported medium and ensures proper transport within the pipeline. A casing 4 is fitted around the outer surface of the insulating layer 3, its primary function being to secure the insulating layer 3 and prevent it from shifting or deforming in the complex deep-sea currents. Furthermore, the casing's surface has been specially treated to provide excellent bonding properties, allowing it to firmly bond to the concrete protective layer 5, forming a stable composite structure. The subsea structure is constructed of concrete, forming a protective layer 5 wrapped around the casing 4. This layer possesses a certain deadweight, balancing deep-sea buoyancy and maintaining the stability of the subsea pipeline. Its streamlined exterior resists ocean hydrodynamic impact loads, preventing significant displacement or damage to the pipeline.

[0052] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise expressly defined, the orientations or positional relationships indicated by the terms "upper" and "lower" are based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connect," "install," and "fix" should be understood in a broad sense. For example, "connection" can mean a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for designing submarine structures based on the hydrodynamic characteristics of the bionic peregrine falcon, characterized in that , specifically including the following steps: Step S1, structural shape optimization: Based on the body shape of the peregrine falcon, the shape of the submarine structure is designed to be streamlined, specifically: The front end of the submarine structure is designed as a smooth arc, similar to the head of a peregrine falcon; the main part of the submarine structure is designed as a gradually narrowing streamline, similar to the body of a peregrine falcon. The main part of the submarine structure uses the principle of the pressure difference between the upper and lower surfaces when the peregrine falcon is in flight. The upper smooth arc surface reduces the impact energy of high-speed water flow, while the enhanced curvature of the lower part guides the water flow through quickly, forming a longitudinal pressure gradient. The streamlined shape of the submarine structure consists of two parts: the upper part is composed of two quarter ellipses of different sizes, and the mathematical expressions are as follows: （1） （2） The lower part is a semi-ellipse, and the mathematical expression is as follows: （3） Among them, the vertical axis used by y1 is 400 mm away from the vertical axis used by y2 and y3, that is, O1O2=400 mm, the unit is mm; x is the normal coordinate of the outer contour of the submarine structure, the unit is mm; a1, a2, a3 and b1, b2, b3 are the major and minor semi-axes of the ellipse used for the outer contour of the submarine structure, the unit is mm; The calculation expression of the geometric center of the submarine structure section is as follows: （4） （5） in, is the horizontal coordinate of the geometric center, is the vertical coordinate of the geometric center, in mm, 、 is the coordinate of the i-th point inside the geometry, in mm; Step S2, surface feature optimization: Imitating the microstructure of peregrine falcon feathers, tiny concave-convex textures or grooves are designed on the surface of the seabed structure, specifically: The main surface of the submarine structure is covered with honeycomb hole structures, which are circular concave holes. Two steel pipes (1) are built into the submarine structure, with diameters of 700 mm and 600 mm respectively. The diameter of each honeycomb hole structure is 100 mm and the concave depth is 20 mm. Step S3: Material selection: The outer side of the steel pipe (1) is tightly covered with an anti-corrosion insulation layer (2), the anti-corrosion insulation layer (2) is in a toroidal structure, the outer side of the anti-corrosion insulation layer (2) is wrapped with a thermal insulation layer (3), the thermal insulation layer (3) is in a toroidal structure, the outer side of the thermal insulation layer (3) is covered with a casing (4), and the submarine structure is formed of a concrete material to form a concrete protective layer (5) wrapped around the outer side of the casing (4).

2. A method for designing submarine structures based on the bionic peregrine falcon fluid dynamics according to claim 1, characterized in that The anti-corrosion insulation layer (2) is a composite polymer material, and the outer surface is coated with a chemical coating.

Images