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題名 | 細斷青割玉米終端速度之研究=The Study on Terminal Velocity for Forage Corn |
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作者 | 連振昌; Lien, Cheng-chang; |
期刊 | 農業機械學刊 |
出版日期 | 20000900 |
卷期 | 9:3 2000.09[民89.09] |
頁次 | 頁37-50 |
分類號 | 434.25 |
語文 | chi |
關鍵詞 | 青割玉米; 終端速度; Forage corn; Terminal velocity; |
中文摘要 | 本研究以青割玉米為研究對象 , 自行組設一直立風洞裝置 , 改變不同長度的 青割玉米草莖及氣流速度 , 藉由應變規量測並轉換成青割玉米草莖所承受之阻曳 力 , 再由理論公式計算出終端速度及阻曳力係數 , 以做為青割玉米青創收機穫氣 力輸送之設計依據。由本研究的試驗數據及多重線性迴歸分析結果 , 在青割玉米 牧草莖含水率為 88.8% 時 , 青割玉米牧草莖終端速度 Vt(m/s) 對重量 W(g) 及投影 面積 A(10[]mm2[]) 之關係為 ;Vt=z15.374+1.441W-1.339A,R[]=0.932 。 |
英文摘要 | The agricultural material of this study is forage corn stem. A vertical wind tunnel equipment was installed to measure the terminal velocity Vt of forage corn stem with different length. The drag force Df of forage corn stem was measured by strain gague. The terminal velocity and drag force coefficient of forage corn stem was calculated through the drag force Df and air velocity square Va2 . The results would be used as the design basis for pneumatic transportation during harvesting. The data were analyzed by multi-linear regression method. When the mnicture content of forage corn stem is 88.8%, the experience formula is Vt = 15.374 + 1.441 W - 1.339 A, and R2=0.932. where W (g) is the weight of the stem, A (102mm2) is the projection area of the stem, Vt (m/s) is the terminal velocity of the stem. R2 is the coefficient of determination. |
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