CN214035964U - Marine semi-submerged formula fan foundation and wind generating set - Google Patents
Marine semi-submerged formula fan foundation and wind generating set Download PDFInfo
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- CN214035964U CN214035964U CN202023309187.3U CN202023309187U CN214035964U CN 214035964 U CN214035964 U CN 214035964U CN 202023309187 U CN202023309187 U CN 202023309187U CN 214035964 U CN214035964 U CN 214035964U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
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Abstract
The utility model provides a marine semi-submersible type fan foundation and wind generating set, which comprises a plurality of main buoys, inclined struts, cross struts and a heave plate, wherein the main buoys are arranged along the vertex positions of regular polygons, adjacent main buoys are connected through the inclined struts and the cross struts, and the heave plate is coaxially arranged at the bottom end of the main buoys; the cross section of the main buoy and the heave plate are both in an ultra-elliptical shape; the main flotation pontoon and the extension line that hangs down and swing the board cross section major axis all adopt through regular polygon's geometric centre the utility model discloses marine semi-submerged formula fan basis main flotation pontoon can effectively reduce the stress concentration coefficient of main flotation pontoon and bracing, stull junction to reduce the thickness of main flotation pontoon, play and float the basic effect of subtracting weight of formula.
Description
Technical Field
The utility model belongs to the technical field of wind power generation, concretely relates to marine semi-submerged formula fan foundation and wind generating set.
Background
With the continuous expansion of the development of wind energy resources, especially the development in deep sea, the research on the floating wind turbine is paid more attention. Common floating foundations include Spar foundations, TLP foundations, semi-submersible foundations, and the like. The coastal water depth is shallow in China, the water depth applicability of the platform and the manufacturing cost of the mooring structure are considered, and the semi-submersible fan foundation is widely concerned in China due to the advantages of good stability and manufacturability, convenience in wet towing and installation and the like.
In general, the semi-submersible platform needs to design the size of a main buoy to be larger, and the heaving inherent cycle is ensured to be far larger than the wave cycle by means of heavy draught. The heave plate is arranged under the main buoy of the semi-submersible platform, so that the platform can be prevented from resonating with waves, and the platform has good motion performance. The additional mass of the heave plate can increase the heave natural oscillation period of the platform and enable the heave natural oscillation period to be far away from a wave energy concentration frequency band; the provided additional damping can effectively reduce the dynamic response of the platform and improve the motion performance of the platform.
As shown in fig. 1, a local stress increase (stress concentration) occurs at a place where the semi-submersible platform foundation main buoy 1 is connected with the wales 4 and the inclined struts 3. The stress concentration can cause fatigue cracks on the object and also can cause static load fracture of parts made of brittle materials. In engineering, the stress Concentration factor SCF (stress Concentration factor) is used to represent the degree of stress Concentration, and the SCF value can be calculated by dividing the maximum stress at which stress Concentration occurs by the average stress, and is greater than 1. Engineering experience shows that the more drastic the change in cross-sectional dimension, the greater the SCF value.
Therefore, the main buoy of the semi-submersible floating type fan is designed to avoid the appearance with right angles and sharp corners as much as possible, and the design scheme of a cylinder is basically adopted at present. However, the SCF value at the joint of the main pontoon 1, the wale 4, and the brace 3 according to the column design is still large, generally reaching 3-5, and since the sensitivity of the wall thickness of the main pontoon 1 to the SCF value is large, in order to make the main pontoon design meet the strength requirement, the existing column design still needs to thicken the wall thickness of the part with the wale and the brace, resulting in the mass of the main pontoon becoming large.
Considering that the magnitude of the SCF value directly affects the magnitude of the wall thickness at the connection between the main buoy and the diagonal braces, it is desirable to design a main buoy structure that can reduce the SCF value at the state of the art, so as to reduce the wall thickness and reduce the weight of the floating foundation.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a marine semi-submerged formula fan basis with hang down and swing the board can reduce the SCF of main flotation pontoon and stull, bracing junction to reduce foundation structure weight.
In order to realize the purpose, the utility model discloses a technical scheme is: a marine semi-submersible fan foundation comprises a plurality of main buoys, inclined struts, cross struts and a heave plate, wherein the main buoys are arranged along the vertex positions of a regular polygon, adjacent main buoys are connected through the inclined struts and the cross struts, and the heave plate is coaxially arranged at the bottom ends of the main buoys; the cross section of the main buoy and the heave plate are both in an ultra-elliptical shape; the extension lines of the long axes of the cross sections of the main buoy and the heave plate pass through the geometric center of the regular polygon.
The super-elliptic cross section outer contour line of the main buoy satisfies the following formula:
the cross section outer contour line of the heave plate connected with the main buoy meets the following formula:
wherein, in the step (A),x、yrespectively representing any point on the contour line in a local coordinate systemxShaft andythe coordinate values on the axis are,a 1representing the transverse section of the main pontoonOut-of-plane contour lines inxThe 1/2 value of the width on the shaft,b 1represents the outer contour line of the cross section of the main buoyyAn on-axis height value;a 2the outer contour line of the cross section of the heave plate is representedxThe 1/2 value of the width on the shaft,b 2represents the outer contour line of the cross section of the pendulous plateyHeight a on axis1/a2=b1/b2，m1= n1、m2=n2And m is1、n1、m2And n2Are all in the range of [1.50, 2.20 ]]Within the interval.
The heave plate is welded with the main buoy.
The joint of the heave plate and the main buoy is in smooth transition.
The number of the main buoys is 3-6.
Thickness of heave platetIs 25-60 mm.
And a reinforcing rib plate is arranged at the joint of the main buoy and the heave plate.
The surfaces of the main buoy, the inclined strut, the cross strut and the heave plate are all provided with anti-corrosion layers.
The utility model provides a marine semi-submerged formula wind generating set, adopts marine semi-submerged formula fan foundation, pylon setting are on the central axis of basis, and the bottom and the main flotation pontoon of pylon pass through bracing and stull and are connected.
Compared with the prior art, the utility model discloses following beneficial effect has at least: main flotation pontoon and the board of swinging that hangs down are oval, adopt the utility model discloses a marine semi-submerged formula fan basis main flotation pontoon can effectively reduce the stress concentration coefficient of main flotation pontoon and bracing, stull junction with the board design of swinging that hangs down, reduces the wall thickness of main flotation pontoon to alleviate main flotation pontoon weight and reduce manufacturing cost.
Drawings
The above and other features and advantages of the present invention will become more apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings, wherein:
fig. 1 is a three-dimensional schematic diagram of a conventional semi-submersible platform foundation.
Fig. 2 is a diagram illustrating a hyperelliptic function curve according to an exemplary embodiment of the present invention.
Fig. 3 is a schematic top view of a semi-submersible wind turbine foundation.
Fig. 4 the utility model discloses a three-dimensional sketch map of semi-submerged formula fan basis main flotation pontoon and the board that dangles.
Fig. 5a is a schematic view of a semi-submersible fan foundation main pontoon and a heave plate of the present invention.
Fig. 5b is a schematic side view of a semi-submersible fan foundation main pontoon and a heave plate of the present invention.
Fig. 5c is a schematic top view of a semi-submersible fan foundation main pontoon and a heave plate of the present invention.
In the attached drawing, 1 is a main buoy, 2 is a tower frame, 3 is an inclined strut, 4 is a cross strut, and 5 is a heave plate.
Detailed Description
Embodiments of the present invention are described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.
The utility model provides a basic main buoy and a heave plate of a marine floating type fan, which can reduce SCF at the joint of the main buoy 1, a cross brace 4 and an inclined brace 3 and reduce the structural weight; a marine semi-submersible fan foundation comprises a plurality of main buoys 1, inclined struts 3, cross struts 4 and heave plates 5, wherein the main buoys 1 are connected with one another through the inclined struts 3 and the cross struts 4, and the heave plates 5 are arranged at the bottom ends of the main buoys 1; the main buoy 1 and the heave plate 5 are both elliptical,
the cross-sectional outer contour of the main pontoon 1 satisfies the following formula:
the cross-sectional outer contour line of the heave plate 5 connected to the main pontoon 1 satisfies the following formula:
wherein, in the step (A),x、yrespectively representing any point on the contour line in a local coordinate systemxShaft long axis andyshort shaftThe local coordinate system is in the cross section range of the main buoy 1, the center of the cross section is taken as an origin, and the long axis of the ellipse is taken as the major axisxAxis of minor axisyThe coordinate system of the axis is set to,a 1represents the outer contour line of the cross section of the main buoy 1xThe 1/2 value of the width on the shaft,b 1represents the outer contour line of the cross section of the main buoy 1yAn on-axis height value;a 2represents the outline of the cross section of the heave plate 5xThe 1/2 value of the width on the shaft,b 2represents the outline of the cross section of the swinging plate 5yHeight value on axis.
The number of the main buoys 1 is 3-6.
The main buoy 1 is arranged along the vertex position of the regular polygon; the extension lines of the long axes of the cross sections of the main buoy 1 and the heave plate 5 pass through the geometric center of the regular polygon.
The joint of the heave plate 5 and the main buoy 1 is in smooth transition, the lower end of the main buoy 1 can be a bell mouth, and the lower end face of the main buoy is welded with the heave plate 1.
Thickness of heave plate 5tIs 25-60 mm.
As an alternative embodiment, a reinforcing rib is arranged at the joint of the main buoy 1 and the heave plate 5.
The surfaces of the main buoy 1, the inclined strut 3, the cross strut 4 and the heave plate 5 are all provided with anti-corrosion layers.
The utility model discloses in implementing, will marine semi-submerged formula fan foundation is used for marine semi-submerged formula wind generating set, and the bottom and the basis of pylon 2 are connected, and pylon 2 sets up on the central axis of basis, and pylon 2 is connected through bracing 3 and stull 4 with main flotation pontoon 1.
The utility model provides a marine showy formula fan basis main flotation pontoon and hang down and swing the board, marine semi-submerged formula fan basis main flotation pontoon 1 with hang down and swing board 5, the following formula is satisfied to the outer contour line of main flotation pontoon 1's cross section:
the cross-sectional outer contour of the heave plate 5 connected to the main pontoon 1 satisfies the following formula:
wherein the content of the first and second substances,x、yrespectively representing any point on the contour line in a local coordinate systemxAxis (long axis) andythe coordinate values on the axis (minor axis),a 1represents the outer contour line of the cross section of the main buoy 1xThe 1/2 value of the width on the shaft,b 1represents the outer contour line of the cross section of the main buoy 1yAn on-axis height value;a 2represents the outline of the cross section of the heave plate 5xThe 1/2 value of the width on the shaft,b 2represents the outline of the cross section of the swinging plate 5yHeight value on axis. In the formula satisfied by the main buoy,a 1/a 2=b 1/b 2，m 1= n 1、m 2=n 2and all satisfy [1.50, 2.20 ]]Within the interval (c).
The utility model discloses a to opening and to locate marine semi-submerged formula fan basis main flotation pontoon 1 and hang down the shape of board 5 and carry out the shape optimization to make stress as little as possible, thereby reach the purpose that reduces the SCF value.
And a rectangular coordinate system XO 'Y is established by taking the center O' as the origin on the outer contour line of the cross section of the main buoy and the heave plate, and the horizontal axis and the vertical axis are respectively defined as an X axis and a Y axis.
Here, as shown in fig. 2, a hyperelliptic function is shown, and the expression is as follows:
the hyperelliptic function is a new shape function based on elliptic function and is formed by two variablesmAndna family of curves can be drawn including ellipses. A curve drawn according to a hyperelliptic function is called a hyperelliptic curve. When in usem=nWhen =2, the hyperelliptic curve is degenerated into an elliptic curve; when in usem=nWhen =1, the hyperelliptic curve is degenerated into a straight line. Due to introduction of variablesmAndnso that the range of the design domain is enlarged, and the design domain is properly setmAndnthe value to achieve the goal of reducing the SCF value.
In thatmAndnrespectively satisfy: 1.50 is less than or equal tom≤2.20，1.50 ≤nWhen the value is less than or equal to 2.20, the main buoy designed according to the shape function formula 1 can effectively reduce the stress concentration coefficient SCF, thereby reducing the thickness of the tower at the position of the main buoy, reducing the total weight of the tower and reducing the production cost.
If it is notmAndnoutside the above range, the above effects cannot be achieved. In detail, inmAndnless than 1.50, the shape of the main pontoon tends to be diamond-shaped, so that the main pontoon has a sharp corner, and the stress concentration coefficient SCF of the corresponding position becomes large, resulting in an increase in the wall thickness of the main pontoon of the corresponding position, an increase in the overall weight of the main pontoon, and an increase in the production cost. In thatmAndnabove 2.20, the shape of the main pontoon approaches a rectangle with corners, so that the stress concentration coefficient SCF at the corresponding location becomes large, resulting in an increased wall thickness of the main pontoon at the corresponding location, an increased overall weight of the main pontoon, and an increased production cost.
Adopt the parameter of foretell main flotation pontoon of hyperelliptic function, will be according to the utility model discloses an adopt the main flotation pontoon of hyperelliptic function formula design and the current main flotation pontoon that adopts the design of standard circle to carry out the comparison. In particular, according to the utility model discloses a main flotation pontoon shape utilizesm 1=1.80，n 1The shape of the existing cylindrical main pontoon is designed by a standard elliptic function formula (1.90) < 2 >m=2，n= 2).
Table 1 below shows the SCF calculations for a main buoy designed using hyperelliptic function in accordance with the present invention versus an existing main buoy designed using standard elliptic function.
TABLE 1
| Standard cylinder main buoy | Super-elliptic main buoy | |
| a and bm | a1=6 b1=6 | a1=7.5 b1=5.0 |
| m1 and n1 | m1=2 n1=2 | m1=1.80 n1=1.90 |
| Wall thickness m | 0.06 | 0.06 |
| SCF | 4.87 | 4.52 |
It is thus seen that, compare in the current main flotation pontoon that adopts the design of standard elliptic function formula, according to the utility model discloses an adopt the main flotation pontoon of super elliptic function formula design to make maximum stress concentration coefficient reduce 7.19%. From the results, compared to the conventional standard elliptical shaped main buoy, the super elliptical shaped main buoy according to the present invention may be more favorable for reducing the stress concentration factor SCF. Therefore, under the existing process conditions, the shape of the main buoy is optimally designed by adopting the hyperelliptic function, and the SCF value can be effectively reduced, so that the thickness of the main buoy is reduced, and the effect of reducing the weight of the floating foundation is achieved.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (9)
1. The offshore semi-submersible fan foundation is characterized by comprising a plurality of main buoys (1), inclined struts (3), cross struts (4) and heave plates (5), wherein the main buoys (1) are arranged, the main buoys (1) are arranged along the vertex positions of regular polygons, adjacent main buoys (1) are connected through the inclined struts (3) and the cross struts (4), and the heave plates (5) are coaxially arranged at the bottom ends of the main buoys (1); the cross section of the main buoy (1) and the heave plate (5) are both in an ultra-elliptical shape; the extension lines of the long axes of the cross sections of the main buoy (1) and the heave plate (5) pass through the geometric center of the regular polygon.
2. Offshore semi-submersible wind turbine foundation according to claim 1, characterized in that the main pontoon (1) has a super-elliptical cross-sectional outer contour which satisfies the following formula:
the cross section outer contour line of the heave plate (5) connected with the main buoy (1) meets the following formula:
wherein x and y represent coordinate values of any point on the contour line on the x axis and the y axis of the local coordinate system respectively, and a11/2 value, b representing the width of the outer contour of the cross-section of the main pontoon (1) in the x-axis1The height value of the outer contour line of the cross section of the main buoy (1) on the y axis is represented; a is21/2 value representing the width of the outline of the cross section of the heave plate (5) on the x-axis, b2Representing the height a of the outline of the cross-section of the swinging plate (5) on the y-axis1/a2＝b1/b2，m1＝n1、m2＝n2And m is1、n1、m2And n2Are all in the range of [1.50, 2.20 ]]Within the interval.
3. Offshore semi-submersible wind turbine foundation according to claim 1, characterized in that the heave plate (5) is welded to the main pontoon (1).
4. Offshore semi-submersible wind turbine foundation according to claim 1, characterized in that the connection of the heave plate (5) and the main pontoon (1) is smoothly transitioned.
5. Offshore semi-submersible wind turbine foundation according to claim 1, characterised in that the number of main pontoons (1) is 3-6.
6. Offshore semi-submersible wind turbine foundation according to claim 1, characterized in that the heave plate (5) has a thickness t of 25-60 mm.
7. Offshore semi-submersible wind turbine foundation according to claim 1, characterised in that the joints of the main pontoons (1) and the heave plates (5) are provided with reinforcing ribs.
8. An offshore semi-submersible wind turbine foundation according to claim 1, characterised in that the surfaces of the main pontoon (1), the diagonal bracing (3), the cross brace (4) and the heave plate (5) are provided with an anti-corrosion layer.
9. An offshore semi-submersible wind turbine generator set, characterized in that, the offshore semi-submersible wind turbine generator set is adopted as the offshore semi-submersible wind turbine generator set foundation of claim 1, the tower (2) is arranged on the central axis of the foundation, and the bottom of the tower (2) is connected with the main buoy (1) through the inclined strut (3) and the cross strut (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023309187.3U CN214035964U (en) | 2020-12-30 | 2020-12-30 | Marine semi-submerged formula fan foundation and wind generating set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023309187.3U CN214035964U (en) | 2020-12-30 | 2020-12-30 | Marine semi-submerged formula fan foundation and wind generating set |
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| CN214035964U true CN214035964U (en) | 2021-08-24 |
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