臺灣博碩士論文加值系統

本論文中，我們提出了一個最佳化之設計與分析，以處理螺旋風扇的壓力損失，此壓力損失，將造成風扇運轉的效率下降及噪音過大現象。因此我們利用田口方法的歸納，來改善並達成風扇性能資料庫之建立，以克服設計上之問題。
首先，我們使用田口方法的L36直交表設計理論，經反覆測試選取後，我們從所有的參數中，選擇9個參數做為實驗控制因數。
再則，根據上述流程，我們嘗試提昇風扇葉片每一截面的壓力數值，我們利用風扇設計法去調整風扇出口絕對軸向速度分佈與風扇出口絕對切向速度，經反覆選取直到合理的發現。
最後，我們利用研究與測試的步驟，找到穩健性與零敏度最佳之控制因素組合。
我們研究的主要貢獻有下列幾點：(1)建立了螺旋風扇性能資料庫，提供給製品開發設計者，選用螺旋風扇之便利。(2)找到了最適控制因素組合之螺旋風扇，使機体風量提昇率高於10%以上。
我相信本篇論文的研究結果，將對螺旋風扇最佳化之設計與分析在未來的研究領域會有相當大的助益。

In this thesis, we propose the design and analysis of optimization of spiral fan to reduce the loss by the fan’s pressure. As we known the efficiency and noise of a spiral fan are closely related to its pressure loss. To reach our goal, the Taguchi method is used to set up the standard values of parameter to overcome the problems in industrial windward fan design.
At first, the L36 algorithm of Taguchi method is adopted as our spiral design theory. By L36 algorithm, we choose nine parameters as the experimental control factors from all parameters of the spiral.This step is performed through many times of iteration of parameter selection .
Besides,based on the above step, we try to promote the presure increment of each blade selection of the spiral fan to get the maximum spiral volume flowing rate. The method we used in the design procedure is to adjust the spiral outlet absolute axial speed and spiral outlet absolute Taguchi speed repetitively by varying the control factors until the optimum solution is found.
Finally, the stability and sensitivity analysis of our design of system are studied and fed back to the previous steps to obtain a practical system with optimum design.
The contributions of our research are as follows:
(1) Build up the spiral performance database to provide the practical
Reference for designer to avoid the nonsense efforts by trail-and-error.
(2) Find out the control factors of optimal performance of spiral
design spiral to upgrade volume flowing rate by 10%.
It is believed that the results of our study in this thesis will be much
helpful to future research in the areas of the applications of spiral
fan.

Contents
Abstract ………………………………….……………………………... I
List of Figures ………………………………………………….....….. III
List of Tables …………………….………………………………........ IV

Chapter 1 Introduction………………………………………….…….1
1.1 Research Motivations………………………………….……1
1.2 Reseach Contributions…..…………………….….………..3
1.3 Organization of This Thesis………………………………..6

Chapter 2 Background and Previous Works…………………….7
2.1 Basic Fan Theory……….…………………………………7
2.2 Basic Fan Design…………………………………………10
2.3 Specification of Spiral Fan Design………..……….……14

Chapter 3 Design and Analysis of Optimization of Spiral Fan..21
3.1 Research Procedures…………………..……………………21
3.1.1 Ideal Function………….…………………………..22
3.1.2 Experiment Plan……………………………………24
3.1.3 Codification and Test Data….…...…….……….…26
3.2 Design Procedures………………………………………35
3.2.1 Selecting The Control Factors by L36 Algorithm ...36
3.2.2 The Law of The Fan Designs to finding Optimum
Solution………………………………………….….41
3.2.3 Stability and Sensitivity Analysis for Contribution
of the Control Factors……………………..……43
3.3 Analysis and Experimental Results…………………….45
3.3.1 Setting The Performance Database of Spiral Fan…45
3.3.2 Promotion of The optimal Performance of Spiral Fan
……………………………………………………..49

Chapter 4 Conclusions and Further Research…………………51

References………………………………………………………………54
List of Figures

Fig. 2.1: flow chart showed the spiral fan design procedure…….…...10
Fig. 2.2: Content of Taguchi Quality Engineering …………………….20
Fig. 3.1: Performance Curves of Spiral Fans …..………………….…...23
Fig. 3.2: Optimal Function of Spiral Fans ……………………...............23
Fig. 3.3: The fan ratio is devised corresponding sampling of 190:332....23
Fig. 3.4: Control Factors and Reception S/N ratios….….……………..34
Fig. 3.5: Control Factors and Reception Sensitivity ………………….34
Fig. 3.6: To use outlet absolute tangential speedC2u speed triangle to simplify outlet and inlet angles of blades…………………..37
Fig. 3.7: Comparison of fan’s performances before and after the value reduction was conducted in order to determine the effects of such reduction……………………………………………40
Fig. 3.8: Assessments and development of spiral fans IN computer
VAB……..……….……………………………………….47
Fig. 3.9: Designers allows to make proper determinations and
selections…………….………………………………….47
Fig. 3.10: Pressure vs. wind quantity of curves……………..…………48
Fig. 3.11: Efficiency vs. wind quantity of curves………………………48
Fig.3.12: The optimize control factor pressure vs. wind quantity of curves………………………………..…….………..……...50
Fig.3.13: The optimized performance of spiral fan curves…………...50



List of Table

Table 3-1: Levels of error factors …….….……………………...……25
Table 3-2: Levels of Control Factors…………..……………………...26
Table 3-3: Codification of L18 Orthogonal Arrays and Test Results …27
Table 3-4: Control Factors and Corresponding S/N ratios …..……….31
Table 3-5: Control Factors and Corresponding Sensitivity….….……..32

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