本文主要目的在建立風扇葉片在不同轉速下,其振動特性之預測模式及風扇對電腦機組溫度場分析。首先使用SolidWorks 來建構模型,並透過有限元素分析軟體,模擬其自然頻率及溫度場變化,模擬量測其轉速在1000、2000、3000rpm時風扇模型的頻率訊息及散熱效果,針對風扇的自然頻率及散熱分析,求得結構之模態參數及機組溫度場變化。經模態分析驗證理論模型,量測風扇之頻率可避免作用於系統之外激振頻率與系統之頻率相同或接近,所產生共振造成結構變形,並進一步了解整體溫度場的壓力、流量及性能曲線。由各種不同參數變化下所得的散熱分析及其性能。結果顯示,5、6、7、8及9扇葉中以6扇葉的數值最好。
In this dissertation the resonant vibration characteristics and temperature distribution are investigated for the cooling fan with different blade numbers and rotational speeds. Through means of constructing the cooling fan model, the vibration and temperature variation analysis are performed by using the SolidWorks software. There are three rotation speeds (1000, 2000, and 3000 rpm) and five different blade numbers (5, 6, 7, 8, and 9) are employed to carry out the resonant vibration and temperature distribution analysis. It is shown that the dynamic behavior and heat dissipation for the cooling fan with six blades is better than the others proposed in this analysis.