KR101658055B1 - Method for analyzing wave considering seabed and Method for analyzing multi-layered soil using it - Google Patents
Method for analyzing wave considering seabed and Method for analyzing multi-layered soil using it Download PDFInfo
- Publication number
- KR101658055B1 KR101658055B1 KR1020150046354A KR20150046354A KR101658055B1 KR 101658055 B1 KR101658055 B1 KR 101658055B1 KR 1020150046354 A KR1020150046354 A KR 1020150046354A KR 20150046354 A KR20150046354 A KR 20150046354A KR 101658055 B1 KR101658055 B1 KR 101658055B1
- Authority
- KR
- South Korea
- Prior art keywords
- wave
- ground
- seabed
- considering
- seabed ground
- Prior art date
Links
- 239000002689 soil Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000006073 displacement reaction Methods 0.000 claims abstract description 30
- 238000004458 analytical method Methods 0.000 claims description 29
- 230000003993 interaction Effects 0.000 claims description 14
- 230000035699 permeability Effects 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000012937 correction Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004856 soil analysis Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/12—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring axial thrust in a rotary shaft, e.g. of propulsion plants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V9/00—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Data Mining & Analysis (AREA)
- Combustion & Propulsion (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Analysis (AREA)
- Software Systems (AREA)
- Remote Sensing (AREA)
- Algebra (AREA)
- Computational Mathematics (AREA)
- Hydrology & Water Resources (AREA)
- Mechanical Engineering (AREA)
- Mathematical Optimization (AREA)
- Sustainable Energy (AREA)
- Pure & Applied Mathematics (AREA)
- Databases & Information Systems (AREA)
- Radar, Positioning & Navigation (AREA)
- Sustainable Development (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
The present invention relates to a method of analyzing a wave considering a seabed ground and a method of analyzing a multi-layered ground using the same, and more particularly, to analyze the characteristics of a wave considering the actual seabed ground made of soil particles, This paper deals with the analysis method of wave considering submarine ground and the method of multi - layer ground analysis using it.
In recent years, research and development of environmentally friendly renewable energy using wind power, tidal power, and solar heat have been widely carried out due to problems of exhaustion of resources and environmental pollution caused by the use of fossil fuel and greenhouse effect. Wind energy, which is a type of renewable energy, is divided into two categories of off-shore wind power generation and offshore wind power generation as pollution-free energy sources. Wind speed that determines the generation amount of wind power generation has high quality in the sea, The center of gravity is shifting to offshore wind power generation rather than land based on the reasons such as the establishment of installation site due to fire, electromagnetic wave, noise problem, and the like. Unlike onshore wind towers, offshore wind towers are subject to additional external forces due to waves, and the conditions of offshore and offshore grounds are different. Therefore, such conditions should be considered when installing offshore wind towers.
Conventional techniques including the following documents and patent documents are based on the numerical analysis of the waves acting on the vertical circumference installed on the sea and securing the stability of the structure against algae and waves through structural modification literature).
(Articles)
Kim, N. H and Cao, T. N.T. (2008), "Wave force analysis of the two vertical cylinders by boundary element method", KSCE Journal of Civil Engineering, Vol. 12, No. 6, pp. 359-366.
(Patent Literature)
Open Patent Publication No. 10-2013-0034755 (published on Mar. 04, 08, 2013) "Support structure for offshore wind power generation and construction method thereof"
However, conventionally, the characteristics of waves are analyzed under a limited condition that the bottom of the seabed is immovable and fixed, and the waves acting on the supporting structure for offshore wind power generation are calculated using the characteristics of the waves.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,
An object of the present invention is to provide a method of analyzing a wave considering an undersea ground for analyzing characteristics of a wave considering an actual seabed ground made of soil particles capable of permeability and displacement.
The present invention also provides a method of analyzing a wave considering an undersea ground which can confirm the characteristics of wave more precisely because the thickness, elastic modulus, saturation degree, permeability coefficient, and porosity of the seabed ground are considered.
In addition, the present invention can be applied to multi-layer ground because it estimates the ground reaction force according to the soil constituting the ground in consideration of the substantial external force applied to the tower of the offshore wind power generator and accurately analyzes the interaction between the foundation of the tower and the surrounding ground The present invention provides a method of analyzing a multi-layered ground using an analysis method of wave considering the seabed ground which can be used.
In order to achieve the above object, the present invention is implemented by the following embodiments.
According to one embodiment of the present invention, the wave analysis method considering the seabed ground according to the present invention is characterized in that the wave is analyzed in consideration of the seabed ground composed of soil particles capable of permeability and displacement.
According to another embodiment of the present invention, in the analysis method of wave considering the seabed ground according to the present invention, the wave is analyzed in consideration of the thickness, elastic modulus, saturation degree, permeability coefficient and porosity of the seabed ground.
According to another embodiment of the present invention, the wavelength and wave height of waves can be estimated through a wave analysis method considering the seabed ground according to the present invention.
According to another embodiment of the present invention, there is provided a method of analyzing waves in consideration of a seabed ground according to the present invention includes: a setting step of analyzing an interaction between a wave and a seabed ground to set an operation relation expression indicating an interaction between the wave and the seabed; And calculating the wave number of the wave by matching the data of the seabed ground measured in the operation relation formula set in the setting step.
According to another embodiment of the present invention, in the method for analyzing waves considering the seabed ground according to the present invention, the setting step may include a boundary condition setting step of setting a boundary condition on the bottom surface and the bottom surface, Wherein the boundary conditions are such that the wave pressure is continuously transmitted through the gap of the seabed ground and the boundary of the fluid The mass is preserved and is set considering that there is no flow and no displacement of the ground in the impermeable fixed basal plane.
According to another embodiment of the present invention, in the method of analyzing waves in consideration of the seabed ground according to the present invention, in the boundary condition setting step, a boundary condition is set as shown in Equation 1 below, (5) < / RTI >
&Quot; (4) "
&Quot; (5) "
According to another embodiment of the present invention, in the method of analyzing waves in consideration of the seabed ground according to the present invention, the data of the seabed ground collected when calculating the wave number in the calculating step include the wave period, the thickness , The permeability coefficient in the x direction of the seabed ground, the unit weight of the pore water, the saturation degree of the seabed ground, the absolute pressure of the wave pressure, the shear elastic modulus of the seabed ground, the Poisson ratio of the seabed ground, and the gap of the seabed ground.
According to still another embodiment of the present invention, there is provided a recording medium on which a method of analyzing waves considering the seabed ground according to any one of claims 1 to 7 is programmed and recorded.
According to another embodiment of the present invention, there is provided a method of analyzing a multi-layered ground using a wave analysis method considering a seabed ground according to the present invention includes an external force calculating step of calculating an external force applied to an offshore wind tower, A ground reaction force calculation step of calculating a ground reaction force of the ground using the displacement calculated in the displacement calculation step, Calculating a wind force acting on the tower by wind, calculating a wind force acting on the tower by the wind, calculating a wind force acting on the tower by the wind generated by the wind, Wherein the displacement calculating step includes a step of calculating a displacement of the wind turbine, And calculating a moment based on the shear force and calculating a displacement of the tower foundation using the moment, and the wind force is calculated in the step of calculating the wind force, The thrust is calculated in consideration of the loss due to the rotation of the blade between the cut in wind speed and the cut out wind speed at which the blade is operated, The reaction force calculation step divides the ground consisting of the sandy soil and the qualitative soil and divides the soil into the elastic range and the plastic range of the ground in the case of the sandy ground and the ground reaction force in the vicinity of the ground surface and the predetermined depth in the calcination range, In the vicinity, the ground reaction force increases and the decrease And the wavelength and wave height of the wave obtained through the analysis method of wave considering the seabed ground according to any one of claims 1 to 7 are used in the wave power calculation step.
The present invention can obtain the following effects by the above-described embodiment, the constitution described below, the combination, and the use relationship.
The present invention has the effect of analyzing the characteristics of waves in consideration of an actual seabed ground made of soil particles capable of permeability and displacement.
Further, since the present invention considers the thickness of the seabed ground, the elastic modulus, the degree of saturation, the coefficient of permeability, the porosity, and the like, it is possible to confirm a more accurate wave characteristic.
In addition, the present invention can be applied to multi-layer ground because it estimates the ground reaction force according to the soil constituting the ground in consideration of the substantial external force applied to the tower of the offshore wind power generator and accurately analyzes the interaction between the foundation of the tower and the surrounding ground There is an effect that can be done.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a reference diagram for explaining a wave propagated to the seabed; Fig.
2 is a diagram showing an external force acting on an offshore wind power generator;
3 is a flowchart of a method for analyzing a multi-layered ground according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a wave analysis method and a multi-layer ground analysis method using the same according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Throughout the specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.
FIG. 2 is a diagram showing an external force acting on an offshore wind turbine generator, FIG. 3 is a view showing a multi-layer ground analysis method according to an embodiment of the present invention Fig.
The method of analyzing waves in consideration of a seabed ground according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The analytical method of the waves is performed by considering an actual seabed ground composed of soil particles capable of permeability and displacement , That is, considering the thickness, elastic modulus, saturation degree, permeability coefficient, and porosity of the seabed ground, it is an object of the present invention to provide a wave analysis method considering the submarine ground which can confirm the characteristics of wave more precisely. The wave number of the wave, that is, the wavelength and the wave height of the wave, can be calculated through the analysis method of the wave. The method of analyzing waves considering the above-mentioned seabed ground includes a setting step of setting a relationship of interaction representing the interaction between the wave and the sea bed by analyzing the interaction between the wave and the seabed ground, And calculating the wave number of the wave by matching the data (ground constant) of the wave.
The setting step is a step of analyzing the interaction between the blue and the sea bed to set an operation relation expression indicating the interaction between the wave and the sea bed, and includes a boundary condition setting step, a working relation setting step, and the like.
The boundary condition setting step is a step of setting a boundary condition at a bottom surface (z = 0) and a bottom surface (z = -d), in which the wave pressure is continuously transmitted through the gap of the sub- And the mass of the fluid is preserved. On the assumption that there is no flow in the impermeable fixed base plane (z = -d) and there is no displacement of the ground, the boundary condition can be set as shown in Equation 1 below.
(2π / cycle), ρ w is the density of the fluid, g is the gravitational acceleration, t is the time, and ρ is the velocity potential, K z is the z-direction permeability coefficient of the seabed ground, p is the wave pressure,
Assuming that the micro-explosion is proceeding on the sea floor as shown in FIG. 1, the waveform on the sea surface is as shown in Equation 2 below. If the velocity potential is set using the waveform, And the wave pressure is set using the velocity potential, the following equation (4) is obtained.
(Where a 0 is the amplitude, k is the wave number, k r = 2π / wavelength, and k i is the decay rate of the amplitude of the wave (wave)
The operation relation setting step is a step of setting an operation relation expression indicating the interaction between the wave and the sea floor using the boundary condition set in the boundary condition setting step. Actually, the sea floor is composed of soil particles capable of being permeable and displaceable , The following equation (5) can be established.
(Wherein, Dj z = 0 is the displacement of the ground in the permeation flow rate, ω z = 0 is a sea floor (z = 0) in the sea floor (z = 0))
For example, the above-mentioned Dj z = 0 and? Z = 0 are calculated by the following equation (6).
(1), A 1 , A 2 , A 3 , A 4 , A 5 , and A 6 representing the compressibility of the soil particles to the compressibility of the soil skeleton are determined using the boundary conditions , Where x is the x-direction permeability coefficient of the seabed, γ w is the unit weight of the pore water, n is the porosity of the seabed, C w 'is the compressibility of the pore water containing air, Shear modulus of soils)
C w 'in Equation (6) is calculated by the following Equation (7), and F 1 , F 2 , and F 3 are calculated by Equation (8) below.
(Where, S r is the degree of saturation of the seabed, C w is the compressibility of the pore water (= 4.9 * 10 - 10 2 / N), P wo is the absolute pressure of the wave pressure)
The estimating step is a step of calculating the wave number of waves by matching the data (ground constant) of the seabed ground measured in the relation relation set in the setting step. The data of the seabed ground required for calculating the wave number (ground coefficient) (D), the permeability coefficient in the x direction of the seabed ground, the unit weight of the pore water, the degree of saturation of the seabed ground, the wave number of the seawater, (Geotechnical constants) of the seabed ground can be obtained by a conventional method (for example, a method of measuring the ground coefficient), a shear modulus of the seabed ground, a Poisson ratio of the seabed ground, a porosity of the seabed ground, Lt; / RTI > The wave number of the wave can be known by matching the data of the measured seabed ground (ground coefficient) with the operation relation, and the wavelength of the wave can be known through the real part (k r = 2π / wavelength) , And the wave height (amplitude) can be determined through the imaginary part (k i = attenuation of the amplitude of wave (wave)). The wave length and wave height obtained from the wave analysis method considering the above-mentioned seabed ground are used to calculate the wave power on the wind tower installed on the shore.
A method of analyzing a multi-layered soil using a wave analysis method in consideration of a seabed ground according to another embodiment of the present invention will be described with reference to FIGS. 1 to 3. The method of analyzing the ground includes an external force calculation step S1 A displacement calculating step S2 for calculating a displacement of the tower foundation using the external force calculated in the external force calculating step S1 and a displacement calculating step S2 for calculating the ground reaction force of the ground using the displacement calculated in the displacement calculating step S2 (S3) of determining the ground reaction force to be obtained. The offshore
The external force calculating step (S1) is a step of obtaining an external force exerted on the tower, and the external force obtained in the external force calculating step (S1) is used to obtain the displacement of the foundation of the tower. Wind force due to direct action of wind, wave caused by wind, and thrust caused by the rotation of the blade (rotor) by the wind act on the tower as an external force. The external force calculation step S1 includes a wind force calculation step S11, a wave power calculation step S12, a thrust calculation step S13, and the like.
The wind power calculating step S11 is a step of calculating a wind force acting on the tower by the wind. For example, the wind power is obtained by calculating a vertical distribution of the wind speed according to the power law for each wind speed. In the wind power calculation step S11, for example, the wind force applied to the tower is obtained by the following equation (9).
(here,
The wave power calculation step S12 is a step of calculating the wave power acting on the tower by the wave analyzed in the wave analysis method considering the seabed ground, The wave power is calculated by using a wavelength or the like. For example, the wave power on the tower is obtained by the following equation (10) (Morrison formula) using the wave value analyzed in the wave analysis method considering the above-mentioned seabed ground. The water particle horizontal velocity and the water particle horizontal acceleration of Equation (10) are obtained by using the wave height, the wavelength and the measured period obtained in the wave analysis method considering the above-mentioned undersea ground, so that a detailed description will be omitted do.
(Where, F is the wave power, ρ is the density of sea water, C D is the drag coefficient, D is the diameter of the tower, u is the horizontal velocity of water particles, C M is the mass coefficient,
The step S13 of calculating the thrust is a step of calculating a thrust acting on the tower by rotation of the blade. The step S13 is a step of calculating the thrust of the blade The thrust is calculated by considering the loss due to the thrust. In the thrust calculation step S13, for example, the final thrust force acting on the tower is calculated by correcting the thrust calculated by reflecting the loss rate calculated by the following equation (12), for example, in the thrust calculated by the following equation (11).
(Where F thrust is thrust, ρ α is air density, C F is thrust coefficient, and U is wind speed)
(Where f is the loss factor, N is the number of blades, μ is the non-dimensionless variable (0.05) for the local position of the blade from the hub to the tip, λ is the design speed ratio (6), u is the wind speed,
The displacement calculation step S2 is a step of calculating the tower foundation displacement using the external force calculated in the external force calculation step S1. The wind power calculated in the wind power calculation step S11, the wave power calculation step S12, (For example, using equation (13)), and calculating a moment using the shear force (for example, using equation (14)), and calculating the moment To calculate the displacement of the tower foundation (e.g., using Equation 15).
(Where V is the shear force, q is the load, y is the longitudinal axis length, and the load is the sum of wind force, wave force, and shear force)
(Where M is moment, V is shear force, y is longitudinal axis length)
(Where v is the displacement of the tower foundation, M is the moment, E is the modulus of elasticity of the pile, I is the moment of inertia of the cross section,
The ground reaction force calculation step S3 is a step of calculating a ground reaction force of the ground using the displacement calculated in the displacement calculation step S2. The ground reaction force calculation step S3 is a step of calculating a ground reaction force ).
The ground reaction force calculation step is a step of calculating the ground reaction force against the displacement of the foundation when the ground is made of the sandy soil layer. The ground reaction force is divided into the elastic range and the plastic range of the ground, and in the plastic range, And the ground reaction force is calculated. When the displacement of the structure installed on the ground is sufficiently large, the ground becomes plasticized. Before the plasticization, the ground is in the elastic range, and after the plasticization, the ground is in the plastic range. The vicinity of the certain depth means a point where the ground reaction force increases and then starts to decrease from the bottom to the top of the ground. The ground reaction force in the elastic range of the ground is obtained by, for example, the following equation (16), and the firing range of the ground and the ground reaction force in the vicinity of the ground surface are obtained, for example, by the following equation (17) The ground reaction force in the vicinity is obtained, for example, by the following expression (18).
(Where p is the soil reaction force, B is the diameter of the foundation, k is the number of springs, z is the depth at the surface of the earth,
(Where p u is the ultimate ground reaction force, B is the diameter of the foundation, A u is the empirical correction factor, and P c is the ultimate resistance
(Where p u is the ultimate ground reaction force, B is the diameter of the foundation, A u is the empirical correction factor, and P c is the ultimate resistance
The step of calculating the resilient clay ground reaction force is a step of calculating the ground reaction force with respect to the displacement of the foundation when the clay is composed of the clayey soil layer. The absolute ground strength per unit length of the pile is calculated (for example, (For example, using the following equation (21)) by calculating the refraction at half of the ultimate ground resistance (for example, using the following equation (20)) and finally calculating the ground resistance (For example, using the following equation (22)).
Where P u is the ultimate soil strength per unit length of the file, γ is the correction factor of the soil, C u is the undrained shear strength, z is the depth, D is the file diameter and J is the empirical dimensionless parameter (0.5)
(Where y50 is the refraction at half the ultimate soil resistance, epsilon 50 is the strain corresponding to half the maximum principal stress, and D is the diameter of the pile)
Where P rest is the soil resistance (reaction force) at the remainder of the ultimate soil resistance, P u is the ultimate soil strength per unit length of the file, z is the depth, C u is the undrained shear strength, D is the file diameter, Dimensionless parameter (0.5), y is the correction coefficient of soil)
Where p is the soil reaction force, P u is the ultimate soil strength per unit length of the pile (reaction force), P rest is the soil resistance (reaction force) at the rest of the ultimate soil resistance, y is the tower foundation displacement, y50 is the ultimate soil resistance Refraction in half)
Using the above-described ground analysis method, it is possible to accurately calculate the load (sum of external forces) acting on the tower before installing the offshore wind turbine generator, and to use the actual constants of the surrounding grounds It is possible to calculate the ground reaction force accurately, and the value calculated in the above can be utilized in the design of the tower foundation of the offshore wind power generator.
Another embodiment of the present invention includes a recording medium in which a method of analyzing waves considering the seabed ground is programmed and recorded. Further, another embodiment of the present invention includes a recording medium on which a multi-layered soil analysis method using a wave analysis method considering the seabed ground is programmed and recorded.
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Should be interpreted as belonging to the scope.
100: Offshore wind turbine generator 110: Tower 120: Power generator
111: Foundation 121: Nacelle 122: Rotor
123: The blade
Claims (9)
The analysis method of wave considering the above-mentioned seabed ground
A setting step of setting an interaction relation expressing the interaction between the blue and the sea floor by analyzing the interaction between the blue and the sea floor, and calculating the wave number of waves by matching the data of the sea floor measured in the relation- And,
The setting step
A boundary condition setting step of setting a boundary condition at the bottom of the sea floor and a bottom surface, and a working relation setting step of setting a working relation expression indicating the interaction between the wave and the sea floor using the boundary condition set at the boundary condition setting step ,
The boundary condition is set considering that the wave pressure is continuously transmitted through the gap of the seabed ground and the mass of the fluid is preserved and that there is no flow in the impermeable fixed base and there is no displacement of the ground,
Wherein the boundary condition setting step sets a boundary condition as shown in Equation (1) below and the following Equation (5) is set in the working relation setting step.
[Equation 1]
&Quot; (5) "
The analysis method of wave considering the above-mentioned seabed ground is characterized in that the wave is analyzed in consideration of the thickness, elastic modulus, saturation degree, permeability coefficient and porosity of the seabed ground.
Wherein the wavelength and the wave height of the wave can be estimated through the wave analysis method considering the above-mentioned seabed ground.
The data of the seabed ground collected in the calculation of the wave number in the calculation step include the wave period, the thickness of the seabed ground, the permeability coefficient in the x direction of the seabed ground, the unit weight of the seam bottom, the degree of saturation of the seabed, The shear modulus of the seabed, the Poisson ratio of the seabed, and the gap of the seabed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150046354A KR101658055B1 (en) | 2015-04-01 | 2015-04-01 | Method for analyzing wave considering seabed and Method for analyzing multi-layered soil using it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150046354A KR101658055B1 (en) | 2015-04-01 | 2015-04-01 | Method for analyzing wave considering seabed and Method for analyzing multi-layered soil using it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR101658055B1 true KR101658055B1 (en) | 2016-09-20 |
Family
ID=57102082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150046354A KR101658055B1 (en) | 2015-04-01 | 2015-04-01 | Method for analyzing wave considering seabed and Method for analyzing multi-layered soil using it |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101658055B1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120052678A (en) * | 2010-11-16 | 2012-05-24 | 대우조선해양 주식회사 | Of offshore wind turbine |
| KR20140104832A (en) * | 2013-02-21 | 2014-08-29 | 제주대학교 산학협력단 | Method for analysis of wave |
-
2015
- 2015-04-01 KR KR1020150046354A patent/KR101658055B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120052678A (en) * | 2010-11-16 | 2012-05-24 | 대우조선해양 주식회사 | Of offshore wind turbine |
| KR20140104832A (en) * | 2013-02-21 | 2014-08-29 | 제주대학교 산학협력단 | Method for analysis of wave |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Oh et al. | A review of foundations of offshore wind energy convertors: Current status and future perspectives | |
| Wang et al. | Centrifuge modeling of lateral bearing behavior of offshore wind turbine with suction bucket foundation in sand | |
| Bhattacharya et al. | Dynamics of offshore wind turbines supported on two foundations | |
| Abadie | Cyclic lateral loading of monopile foundations in cohesionless soils | |
| Jardine | Geotechnics, energy and climate change: the 56th Rankine Lecture | |
| Sørensen et al. | Wind energy systems: Optimising design and construction for safe and reliable operation | |
| KR101626107B1 (en) | An analysis of the multi-layered soil on monopile foundation of offshore wind tower | |
| Jara | Model testing of foundations for offshore wind turbines | |
| Wang et al. | Lateral capacity assessment of offshore wind suction bucket foundation in clay via centrifuge modelling | |
| Alderlieste | Experimental modelling of lateral loads on large diameter mono-pile foundations in sand | |
| Ibsen | Implementation of a new foundations concept for offshore wind farms | |
| Ibsen et al. | Bucket Foundation, a status | |
| Ma et al. | An investigation into the lateral loading response of shallow bucket foundations for offshore wind turbines through centrifuge modeling in sand | |
| Hamre et al. | Lateral behaviour of large diameter monopiles at Sheringham Shoal Wind Farm | |
| Harris et al. | Marine scour and offshore wind: lessons learnt and future challenges | |
| Sparrevik | Offshore wind turbine foundations state of the art | |
| CN117113718A (en) | Method, device and medium for measuring scouring power of offshore wind power single pile foundation | |
| Westgate et al. | Geotechnical considerations for offshore wind turbines | |
| KR101658055B1 (en) | Method for analyzing wave considering seabed and Method for analyzing multi-layered soil using it | |
| Sorensen et al. | Testing of laterally loaded rigid piles with applied overburden pressure | |
| Wang et al. | Effects of storm wave-induced liquefaction on lateral deformation of monopile-type offshore wind turbines in silt seabed | |
| Shakeran et al. | Centrifuge testing on ordinary and hybrid suction caissons subjected to cyclic lateral loading | |
| Eamer et al. | Geotechnical parameters important for offshore wind energy in Atlantic Canada | |
| Ahidashti et al. | Insight into the post-liquefaction behaviour of skirted foundations | |
| Xu et al. | Discussion of Several Key Technologies about Offshore Wind Power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| FPAY | Annual fee payment |
Payment date: 20190917 Year of fee payment: 4 |