- 學位論文
基礎勁度對風機系統線性振動行為之影響研究
Effects of Foundation Stiffness on The Linear Vibration of Wind Turbine Systems
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摘要
近年來環保意識抬頭，對於再生能源的需求逐漸增加，其相關技術也 逐漸改良以及被運用，而風力發電也是再生能源的其中一種，利用風能發 電沒有燃料與輻射、空氣污染的問題，因此風力發電成為具有經濟效益的 再生能源之一，台灣風力發電機大多位於沿海地區，容易造成看不見的破 壞，因此定期監測與維護對於降低風險與成本有很大的幫助。 本論文延續本研究群之前所分析的一維頻率域連續解 1DC 程式之風機 塔柱模型，加上地下結構物與土壤進行模擬，以觀察地下結構物與土壤對 風機塔柱之振動頻率影響。 經數值模擬與結果分析後得知，土壤剪力波波速、樁直徑與基座尺寸 對風機塔柱振動頻率的影響相當明顯，而影響幅度會隨著基礎勁度增加而 減少。在分層土壤的數值模擬中，以最上層之土壤對風機塔柱振態頻率影 響最大。
並列摘要
Previous study found that the dominant frequency of a linear structure, such as the supporting tower of a wind turbine decreased as some local stiffness decreased in the cantilever beam model, simulated using linear spectral elements. Decrease in the dominant frequency was also resulted from the increase in the added mass at the free end of the beam model. Current research expanded this cantilever beam model to analyze the effect of foundation stiffness. Parameters investigated include the shear wave velocity of the soil, the diameter and the length of the mono pile, and the size of the tower-base plate. The results show that the shear wave velocity, the pile diameter, and the base plate size all affect the first modal frequency of the model significantly. However the pile length has little effect except for a smaller tower-base plate and at a shear wave velocity less than 150m/s in the surrounded soil. Numerical modeling has also been performed for two-, three-, and four-layer soil. The soil stiffness at the top layer of all three models should be one of the critical factors affecting both first and second modal frequencies.
參考文獻
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