CN111941896A - Method for improving damping performance of wind driven generator blade - Google Patents
Method for improving damping performance of wind driven generator blade Download PDFInfo
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- CN111941896A CN111941896A CN202010729345.6A CN202010729345A CN111941896A CN 111941896 A CN111941896 A CN 111941896A CN 202010729345 A CN202010729345 A CN 202010729345A CN 111941896 A CN111941896 A CN 111941896A
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- blade
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0025—Producing blades or the like, e.g. blades for turbines, propellers, or wings
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Abstract
The invention discloses a method for improving the damping performance of a blade of a wind driven generator, which comprises the steps of adding a polyurethane toughening agent and a nano material into resin to obtain modified resin, using a fiber fabric and the modified resin to prepare a damping structure layer through vacuum infusion molding, bonding the damping structure layer and a blade shell core material through light curing glue, then performing joint cutting and punching on the bonded whole, and finally performing curing molding with an original blade layer structure to obtain the blade with high-structure damping performance. The method of the invention increases the weight and the weight distance of the blade as little as possible under the condition of not changing the original structure of the blade, and can obviously increase the structural damping of the blade.
Description
Technical Field
The invention relates to the technical field of wind driven generator blades, in particular to a method for improving the damping performance of a wind driven generator blade.
Background
Wind power is considered one of the cleanest, most environmentally friendly energy sources presently available, and in recent years, wind power generation is becoming a hot tide around the world and is gaining more favor. The principle of wind power generation is that wind power is used for driving blades of a wind driven generator to rotate, and then the rotating speed is increased through a speed increaser to drive the generator to rotate for power generation. The kinetic energy of wind is converted into mechanical kinetic energy, and then the mechanical energy is converted into electric kinetic energy, namely wind power generation.
The blade is one of the most critical and important components in the wind power generator, and the performance of the blade directly influences the operation of the whole unit. With the development of offshore blades in recent years, the single-machine capacity of a wind turbine generator is continuously enlarged, the length of the blades is larger and larger, and large blades with the length of more than 100m are available abroad. The trend of large-scale blades brings about a series of blade design problems, most obviously, the increase of the blade size can obviously reduce the damping of the blade structure, even cause the blade flutter phenomenon, and seriously affect the service life of the whole unit. Therefore, how to improve the blade damping becomes a problem to be considered in the blade design.
At present, there are two main methods for this situation, one of them is, as in patent CN2737980Y, bonding a structural damper with a wind turbine blade by an adhesive, and bonding a damping material into a whole, where the damping material is damping rubber or viscoelastic damping rubber. The method has higher requirement on bonding, and the structural damper is easy to fall off under the action of long-term load during the operation of the subsequent blade, thereby undoubtedly increasing the later-stage examination and maintenance cost of the blade; in another patent, CN106739003, a damping material is made into a damping structure layer, and the damping structure layer is directly co-cured and formed together with an original blade layer, so that firstly, the problem of low interface bonding strength between a fiber layer and the damping layer exists, and secondly, the overall weight and weight distance of the blade are increased, which may cause certain influence on the overall performance of the unit and may be irreparable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for improving the damping performance of a wind driven generator blade.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a method for improving the damping performance of a wind driven generator blade comprises the steps of adding a polyurethane toughening agent and a nano material into resin to obtain modified resin, using a fiber fabric and the modified resin to prepare a damping structure layer through vacuum infusion molding, bonding the damping structure layer and a blade shell core material through light curing glue, then performing joint cutting and punching on the bonded whole, and finally performing curing molding with an original layer structure of the blade to obtain the blade with high-structure damping performance; which comprises the following steps:
1) selecting a nano material which is in good contact with a resin interface, adding the selected nano material and a polyurethane toughening agent into resin for mixing so as to greatly improve the damping performance of the resin, and fully mixing to obtain modified resin;
2) the modified resin and the fiber fabric are subjected to vacuum infusion to prepare a damping structure layer, wherein the fiber fabric is consistent with the original fabric system of the blade;
3) after curing is finished, positioning and bonding the upper surface of the blade shell core material and the damping structure layer by using light curing glue, and ensuring that the sum of the thickness of the blade shell core material and the thickness of the damping structure layer is consistent with the total thickness of the blade shell core material without considering the thickness of the damping structure layer, namely, reducing the thickness of the original blade shell core material and replacing the damping structure layer;
4) according to the requirement of joint cutting and punching of the blade shell core material in the blade production process, joint cutting and punching are carried out on the blade shell core material bonded with the damping structure layer, namely the blade shell core material and the damping structure layer are subjected to joint cutting and punching together;
5) in the manufacturing process of the blade, the blade shell core material of the adhesion damping structure layer after the cutting seam is punched is placed into a blade mould, the blade is formed by vacuum infusion according to the blade production process, and the blade with high structure damping performance can be obtained after solidification.
In the step 1), the damping performance of the resin is increased, and meanwhile, the mechanical property of the resin is ensured to meet the manufacturing requirement.
In the step 2), the fiber fabric is a multilayer glass fiber fabric or a multilayer carbon fiber fabric.
In the step 2), the chopped strand mats are laid on the upper surface and the lower surface of the fiber fabric, so that the resin and the surface can be completely infiltrated in the later blade infusion process.
In the step 2), the thickness of the prepared damping structure layer is 3-7 mm.
In the step 4), when the core material of the blade shell and the damping structure layer are punched and joint-cut together, the quality of punching and joint-cutting needs to be ensured, so that in the later blade pouring process, resin can infiltrate into the core material of the blade shell and the interior of the damping structure layer.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with the damper with an external structure, the method of the invention does not need later-stage examination and maintenance cost.
2. Compared with the simple resin modification, the method of the invention obviously improves the damping performance, and the viscosity is not easy to control after the resin modification, so the resin is not easy to be directly used as a reinforcing material.
3. The damping structure layer and the blade shell core material are subjected to joint cutting and punching together, so that the resin infiltration quality in the curing of the blade shell is ensured, and the perfusion integrity is good.
4. The sum of the thickness of the blade shell core material and the thickness of the damping structure layer is consistent with the total thickness of the blade shell core material when the thickness of the damping structure layer is not considered, the interface bonding strength between the damping structure layer and the blade structure is high, the quality and the mass distance of the blade are ensured to be small, and the influence on the blade structure and other components is small.
In a word, the method is simple and reliable, has strong designability and is convenient to realize, the damping structure layer is bonded with the core material of the blade shell, the joint is cut and punched together, and finally the damping structure layer and the original layer structure of the blade are cured and molded to obtain the blade with high structural damping performance.
Drawings
Fig. 1 is a schematic diagram of joint cutting and punching after a damping structure layer is bonded with a blade shell core material, wherein 1 is the damping structure layer, 2 is the blade shell core material, 3 is the hole punching of the damping structure layer and the blade shell core material, and 4 is the joint cutting of the damping structure layer and the blade shell core material.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The method for improving the damping performance of the blade of the wind driven generator mainly comprises the steps of adding a polyurethane toughening agent and a nano material into resin to obtain modified resin, using a fiber fabric and the modified resin to prepare a damping structure layer through vacuum infusion molding, bonding the damping structure layer and a blade shell core material through light curing glue, performing joint cutting and punching on the bonded whole, and finally performing curing molding with an original blade layer structure to obtain the blade with high-structure damping performance; the method comprises the following specific steps:
1) selecting a nano material which is in good contact with a resin interface, such as a metal nano material with high modulus, adding the selected nano material and a polyurethane toughening agent into resin to greatly improve the damping performance of the resin, and mixing the materials according to a proper proportion to prepare modified resin; wherein, the mechanical property of the prepared modified resin is not much lower than that of the original resin under the condition of ensuring that the damping property is increased as much as possible.
2) The modified resin and the fiber fabric are infused in vacuum to prepare a damping structure layer with the thickness of 3-7 mm; the thickness of the damping structure layer is optimal about 5mm, the thickness is too small, the improvement effect of damping cannot be guaranteed, the blade can be increased in weight due to too thick thickness, the fiber fabric is required to be consistent with an original fabric system of the blade as far as possible, the filling quality between the damping structure layer and the blade shell can be further improved, the fiber fabric can be specifically a multilayer glass fiber fabric or a multilayer carbon fiber fabric, chopped strand mats can be laid on the upper surface and the lower surface of the fiber fabric, and therefore the resin and the surface can be completely soaked in the later blade filling process.
3) After the curing is finished, the upper surface of the blade shell core material and the damping structure layer are positioned and bonded by using the light curing adhesive, the positioning and bonding are required to be carried out according to the size of the core material, the bonding firmness is ensured, the sum of the thickness of the blade shell core material and the thickness of the damping structure layer is ensured to be consistent with the total thickness of the blade shell core material when the thickness of the damping structure layer is not considered, namely the thickness of the original blade shell core material is reduced, the damping structure layer is replaced, the structural stability is mainly influenced by the core material, the performance of the damping structure layer is better than that of the core material, so that the.
4) According to the requirement of slotting and punching the core material of the blade shell in the blade production process, slotting and punching are carried out on the core material 2 of the blade shell bonded with the damping structure layer 1, as shown in figure 1, namely, the core material 2 of the blade shell and the damping structure layer 1 are punched 3 and slotted 4 together, and if the punching distance is 25mm x 25mm, the aperture is 2mm, the slotting distance is 25mm x 25mm, and the slot width is 2 mm; when the joint cutting is used for punching, the quality of the punched hole 3 and the quality of the joint cutting 4 need to be guaranteed, so that in the later blade pouring process, resin can infiltrate the core material and the interior of the damping structure layer.
5) In the blade manufacturing process, the blade shell core material of the adhered damping structure layer after the cutting seam is punched is placed into a blade mold, the damping structure layer is placed upwards, the blade molding is completed through vacuum infusion according to the blade production process, and the blade with high structural damping performance (namely the blade with the damping structure layer) can be obtained after solidification.
In conclusion, the manufacturing process of the blade with the high-structure damping performance is provided, the operation is simple, the realization is convenient, the interface bonding strength between the damping structure layer and the blade structure is high, the influence on the blade structure and other parts is small, the damping performance of the blade is better, the practical application value is realized, and the popularization value is worthy.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A method for improving the damping performance of a wind driven generator blade is characterized by comprising the following steps: adding a polyurethane toughening agent and a nano material into resin to obtain modified resin, carrying out vacuum infusion molding on a fiber fabric and the modified resin to obtain a damping structure layer, bonding the damping structure layer and a blade shell core material through light curing glue, then carrying out joint cutting and punching on the bonded whole, and finally carrying out curing molding with an original blade layer structure to obtain the high-structure damping-performance blade.
2. A method of improving the damping performance of a wind turbine blade according to claim 1, comprising the steps of:
1) selecting a nano material which is in good contact with a resin interface, adding the selected nano material and a polyurethane toughening agent into resin for mixing so as to greatly improve the damping performance of the resin, and fully mixing to obtain modified resin;
2) the modified resin and the fiber fabric are subjected to vacuum infusion to prepare a damping structure layer, wherein the fiber fabric is consistent with the original fabric system of the blade;
3) after curing is finished, positioning and bonding the upper surface of the blade shell core material and the damping structure layer by using light curing glue, and ensuring that the sum of the thickness of the blade shell core material and the thickness of the damping structure layer is consistent with the total thickness of the blade shell core material without considering the thickness of the damping structure layer, namely, reducing the thickness of the original blade shell core material and replacing the damping structure layer;
4) according to the requirement of joint cutting and punching of the blade shell core material in the blade production process, joint cutting and punching are carried out on the blade shell core material bonded with the damping structure layer, namely the blade shell core material and the damping structure layer are subjected to joint cutting and punching together;
5) in the manufacturing process of the blade, the blade shell core material of the adhesion damping structure layer after the cutting seam is punched is placed into a blade mould, the blade is formed by vacuum infusion according to the blade production process, and the blade with high structure damping performance can be obtained after solidification.
3. A method of improving the damping performance of a wind turbine blade according to claim 2, wherein: in the step 1), the damping performance of the resin is increased, and meanwhile, the mechanical property of the resin is ensured to meet the manufacturing requirement.
4. A method of improving the damping performance of a wind turbine blade according to claim 2, wherein: in the step 2), the fiber fabric is a multilayer glass fiber fabric or a multilayer carbon fiber fabric.
5. A method of improving the damping performance of a wind turbine blade according to claim 2, wherein: in the step 2), the chopped strand mats are laid on the upper surface and the lower surface of the fiber fabric, so that the resin and the surface can be completely infiltrated in the later blade infusion process.
6. A method of improving the damping performance of a wind turbine blade according to claim 2, wherein: in the step 2), the thickness of the prepared damping structure layer is 3-7 mm.
7. A method of improving the damping performance of a wind turbine blade according to claim 2, wherein: in the step 4), when the core material of the blade shell and the damping structure layer are punched and joint-cut together, the quality of punching and joint-cutting needs to be ensured, so that in the later blade pouring process, resin can infiltrate into the core material of the blade shell and the interior of the damping structure layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010729345.6A CN111941896A (en) | 2020-07-27 | 2020-07-27 | Method for improving damping performance of wind driven generator blade |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010729345.6A CN111941896A (en) | 2020-07-27 | 2020-07-27 | Method for improving damping performance of wind driven generator blade |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8502793D0 (en) * | 1984-02-13 | 1985-03-06 | Gen Electric | Hollow composite airfoils |
| CN101704313A (en) * | 2009-09-22 | 2010-05-12 | 中国船舶重工集团公司第七二五研究所 | Structural high-damping fiber-reinforced composite |
| CN102116268A (en) * | 2009-12-30 | 2011-07-06 | 洛阳双瑞风电叶片有限公司 | Method for improving damping performance of wind-power blades |
| CN102146196A (en) * | 2011-01-27 | 2011-08-10 | 北京玻钢院复合材料有限公司 | Preparation method of high damping epoxy resin composite |
| CN106739003A (en) * | 2016-12-20 | 2017-05-31 | 太原科技大学 | Co-curing damping perforation type presses down pneumatic equipment bladess for structure of quivering and preparation method thereof |
| CN108045039A (en) * | 2017-12-06 | 2018-05-18 | 上海复合材料科技有限公司 | A kind of structure high-damping carbon fibre composite and preparation method thereof |
| CN110483951A (en) * | 2019-09-02 | 2019-11-22 | 国电联合动力技术有限公司 | A kind of damping noise-reducing wind electricity blade and preparation method thereof |
-
2020
- 2020-07-27 CN CN202010729345.6A patent/CN111941896A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8502793D0 (en) * | 1984-02-13 | 1985-03-06 | Gen Electric | Hollow composite airfoils |
| CN101704313A (en) * | 2009-09-22 | 2010-05-12 | 中国船舶重工集团公司第七二五研究所 | Structural high-damping fiber-reinforced composite |
| CN102116268A (en) * | 2009-12-30 | 2011-07-06 | 洛阳双瑞风电叶片有限公司 | Method for improving damping performance of wind-power blades |
| CN102146196A (en) * | 2011-01-27 | 2011-08-10 | 北京玻钢院复合材料有限公司 | Preparation method of high damping epoxy resin composite |
| CN106739003A (en) * | 2016-12-20 | 2017-05-31 | 太原科技大学 | Co-curing damping perforation type presses down pneumatic equipment bladess for structure of quivering and preparation method thereof |
| CN108045039A (en) * | 2017-12-06 | 2018-05-18 | 上海复合材料科技有限公司 | A kind of structure high-damping carbon fibre composite and preparation method thereof |
| CN110483951A (en) * | 2019-09-02 | 2019-11-22 | 国电联合动力技术有限公司 | A kind of damping noise-reducing wind electricity blade and preparation method thereof |
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Application publication date: 20201117 |
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