- 期刊
ANOVA 應用於複合式風扇之預測與分析
ANOVA for composite fan of prediction and analysis
摘要
本研究針對具有離心式與軸流式兩種葉片之複合式風扇應用於電子產品散熱相關研究之設計與測試探討，藉由田口方法進行實驗規劃，探討複合式風扇在不同的離心式葉片長度、風扇與散熱鰭片之間散熱間距與加熱功率對熱阻的影響，再藉由風洞測試進行分析比對，並利用Minitab 對實驗結果進行變異數分析，並探討各控制因子對複合式風扇之熱性能表現的影響，進而假設回歸曲線進行輸出品質的預測並與實驗結果比較，期能藉此獲得產品最適化設計參數，並能有效提升電子產品使用壽命與效能。實驗參數 設定以離心葉片長度(6、7、8、9、10 mm) 、風扇與散熱鰭片的散熱間距(0、3、6、9、12 mm)、與加熱功率(30、40、50、60、70W)等為3 個控制因子(5 個水準)，再配合固定之風扇轉速3500 rpm進行實驗，並以熱阻為輸出品質，利用田口直交表(L_(25))進行實驗規劃分析找出最適化組合。田口方法L_(25)直交表預測結果顯示最適化組合為：6 mm離心葉片長度、9 mm散熱間距與70 W加熱瓦數時具有最好效果，並經實驗驗證其熱阻值為0.353℃/ W ，為全部組合中熱阻值最低；最後計算二次回歸方程式結果顯示總偏差R2為97.47%，與R^2標準值95%以上相符合，再使用Matlab相減實驗值與預測值做等值線分佈圖，而分析結果顯示相配率最高達到97.02%。
並列摘要
This research aims to study the applications of composite fans which have axial blades and centrifugal blades in electronic products heat dissipation. Taguchi method is used for experiment planning. The effects on heat dissipation rate and heating power were discussed on following factors: the length difference of centrifugal blades and the distance between fan and heat sink. The experiment results are compared with wind tunnel testing analysis. The experimental results performed using Minitab for ANOVA to explore each control factor on composite fan thermal performance. Further the output quality will be predicted by regression curve and compared with the experimental results, and expect to get best product design parameters, and then effectively enhance the service life and performance electronic products. In this research, there were three factors which are length of centrifugal fan blades (6, 7, 8, 9, 10mm), the distance between heat sink and fan (0, 3, 6, 9, 12 mm), and heating power (30, 40, 50, 60, 70W). The L_(25) orthogonal arrays within 3 control factors and 5 levels were carry out the optimal parameter combinations under the condition of fan rotation rate of 3500 rpm, and the thermal resistance as output quality. The impact and reliability of each factor on the quality were calculated by Minitab for ANOVA. Then regression equation was used to predict thermal resistance, and use Matlab subtraction predictions and experimental results contour lines to match the differences. The L_(25) orthogonal arrays indicate that parameter combinations of the length of centrifugal fan blades 6 mm, the heat dissipation distance 9 mm and heating power 70W has the optimal performance. Also, the experiment results confirm the thermal resistance was 0.353 ℃/W, which was the lowest one of all the parameter combination. The regression equation show the R^2 was 97.47% match the standard value. Then the Matlab subtraction predictions and experimental results contour lines shows the match rate up to 97.02%.