| 研究生: |
周塏晉 Chou, Kai-Ching |
|---|---|
| 論文名稱: |
1KW風力發電葉片與塔架設計及監控系統研究 Development of blade & tower structure and monitoring system for the 1KW wind turbine |
| 指導教授: |
鄭泗滄
Jeng, Syh-Tsang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics |
| 論文出版年: | 2011 |
| 畢業學年度: | 99 |
| 語文別: | 中文 |
| 論文頁數: | 192 |
| 中文關鍵詞: | 混合定律(Rules of Mixture) 、結構健康監控 、集電環(Slip ring) 、應變規(Strain gauge) 、手積法 、VARTM 、動平衡 |
| 外文關鍵詞: | Health Monitory, Multistage Tower, Composite Material, Hand Lay-up, VARTM, Dynamic Balancing |
| 相關次數: | 點閱:98 下載:4 |
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本文之研究目的為1KW風力發電機結構上的設計、模擬、製造等一系列的流程開發。對於塔架設計而言,本文會根據所需負載的重量、塔架的高度及所需承受的最大受力等參數為依據,基於懸臂樑彎矩(bending)理論運算,計算出塔架所需要的直徑、厚度等參數。此外,更運用多段塔架設計概念,來算出在不同高度下,受18m/s風下的負載,所需要的圓管直徑,以確保塔架的強度,也可以達到塔架輕量化與節省成本的目標。
對於葉片設計而言,一般都是使用ABS或木頭這類的材質來製作葉片,可能會有強度不足或斷裂的情形,在此次的研究上,本文會根據複合材料力學中的混合定律(Rules of Mixture),計算出疊層的等效參數,並輸入至商用有限元素軟體模擬LS-DYNA,透過應力值的呈現,作為包覆在葉片上的複合材料強化疊層與纖維角度的設計依據。
在驗證方面,會將BEM(Blade Element Method)理論所算出來的受力值與參考資料做比對,來增加計算出來的受力值的可信度。在材料試驗中所得到的材料參數,輸入模擬之中進行比對來驗證此材料性質是可用的,並以量測應變值的方法利用葉片的準靜態彎矩實驗來驗證幾何外型的可信度,最後再驗證所設計的圓管直徑在模擬下應力值是否也與所計算出來的值相同。
在監控系統上,我們會在葉片應變明顯的部位上裝上應變規(Strain gauge),並搭配集電環(Slip ring)與無線訊號發射裝置,在環境風洞中,監測旋轉的狀態下,其葉片的應變值在不同風速與轉速下的關係。
對於實體製作程序而言,本文中會介紹本次使用複合材料強化葉片的手積法(hand lay-up)與VARTM(Vacuum Assisted Resin Transfer Molding)法。由於手積法會產生些微的重量與質心位置的偏差,因此我們會使用自製的質心平衡與葉片平衡設備,並使用配重塊加以調整,使得葉片可以達到靜態平衡(static balancing)與動態平衡(dynamic balancing),相關內容將在文章中有完整的介紹。
The purpose of this study is to research and develop the complete process of design, analysis and manufacture for 1K wind turbine. For the tower structure, the diameter and corresponding thickness of the tower will be computed and determined by the critical wind and gravity loadings from the beam theory in order to achieve the goals with light-weight and cost-down on multistage concept. As for 1KW blades, the rules of mixture were used to estimate the equivalent coefficients in this study. The commercial FEM code – LS-DYNA was utilized to analyze the stress distribution of the blade model. According the numerical results, we can understand what kind of lamina with its effective fiber angles we needed.
For the verification, there are three crucial cases will be verified in this study. At first, the Blade Element Method (BEM) theory and fluent’s results can be clearly compared and justified in order to elevate the adequacy and accuracy of the loadings form BEM. Second, the material of ABS and composite with glass fiber are acquired from the SHMAZDU AG-X test machine. The bending test for the blade will be performed a good agreement by examining the strain of the experimental and simulated results. Finally, the principal equivalent stress will be compared in correct by the bending theory with circular hollow beam and LS-DYNA code for the tower structure.
As for the Health monitoring system, the strain gauges will be utilized to measure the strain of the blade on the location of maximum Vonmise’s stress happened. In addition, the slip ring and the wireless signal transmitter devices are used to capture data in the wind tunnel with various wind speeds under specific rotation speeds. Due to measured strain, we can determine and construct the full monitory system to prevent structure failure and announce the warring message to the supervisor. For the manufacture procedures of blade, the composite reinforced blade/specimen was utilized by hand lay-up or VARTM methods, respectively.
Due to the weight deviation from the hand lay-up method, the home-made mass balancing and blade balancing equipments are used to calibrate and look for where should be increased or decreased the mass. Via the mass calibration of blade, we can ensure and confirm that the composite reinforced blades will be achieved the situations of static and dynamic balancing.
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