Disigning coolant channel on the firebox of liquid rocket engine to loxodrome ( equal - angle helix ) groove can improve firebox coolant capability greatly. because the width dimension of loxodrome groove is narrow and the depth is deep, some machining methods are incapable, such as end - milling or electrochemistry. according to the peculiarities, a cnc disk - cutter - milling method which is composed of five motion axes with four simultaneously interpolated ones is researched. because most firebox generatrix is composed of complex curves, it is very difficult to get cnc cutting program with manual means. in order to deal with the problem, the loxodrome mathematics model is studied, and an auto - programming software system is developed. the software system can generate cnc cutting program of loxodrome on many kinds of turned surface. the constriction - distension segment of firebox is the most representative workpiece. the sharp changing of its generatrix slope makes loxodrome milling difficult. with the theory analyzing and practice cutting experiment, some applied techniques, which include milling mode and direction, choosing cutter diameter and cutting start point setting, are developed. adopting the technology above, tens regular workpiece have been manufacturing. the two - year manufacture practice has confirmed the validity and feasibility of developed loxodrome coolant channel milling method. the developed technology is also worth to be referenced to other similar workpiece
將液體
火箭發動機燃燒室的冷卻通道設計為斜航線（等傾角螺旋線）槽形，可以大幅度改善燃燒室的冷卻性能.斜航線冷卻槽的槽寬尺寸較小而槽深尺寸較大，所以無法使用棒銑刀銑削、電化學等加工方式.針對這些特點，提出了五軸控制、四軸聯動的數控片銑刀銑削加工方法.由於燃燒室外表面的母線輪
廓復雜，手工編制數控加工程序難度大.為了解決數控加工程序的編制問題，研究了斜航線的數學模型，開發了自動編程軟體系統.使用該系統，可以生成多種母線輪
廓回轉體外表面上的斜航線數控加工程序.燃燒室收斂-擴張段的母線斜率變化大，加工難度大，是斜航線冷卻通道加工的最典型工件.經過理論分析和實際切削實驗，研究了針對該類型工件的片銑刀直徑選擇、銑削方式和方向、刀具調整和起刀點的設置等多項實際的加工方案.採用上述的一系列技術，已經成功地加工了數十個合格工件.經過兩年多的實際生產過程應用，驗證了所開發的斜航線冷卻通道加工方法的正確性和可行性.這些加工技術的研製成功，對其他相似類型零件的加工亦具有參考意義
We are traveling by train. out the windows, we drink in the passing scene of cars on nearby highways, of children waving at a crossing, of cattle grazing on a distant hillside, of smoke pouring from a power plant, of row upon row of corn and wheat, of flatlands and valleys, of mountains and rolling hillsides, of city skylines and village halls
乘著
火車，我們領略著窗外流動的景色：附近高速公路上奔馳的汽車、十字路口處招手的孩童、遠山上吃草的牛群、源源不斷地從電廠排放出的煙塵、一片片的玉米和小麥、平原與山谷、群山與綿延的丘陵、天空映襯下城市的輪
廓，以及鄉間的莊園宅第! 。
Portions of the sample are added until the outline of the candle flame is no longer discernible.
加入一份樣品直至燭光
火焰的輪
廓不再看清為止。
It was a sensuous, tropic night. in the background a volcano crater was silhouetted against the stars
背景是襯著一天星星的
火山口輪
廓，頭頂是一彎蒼白的漂浮的月牙兒。
People have been researching on the techniques of measuring geometric parameters on train wheel profile for decades at home and abroad
國、內外對於
火車車輪輪
廓幾何參數的檢測已經進行了一些研究和探索。
In addition, the algorithm has been discussed and realized that distills the fire smoke envelope in fire smoke image sequence by use of instantaneous motion analysis and cumulated motion analysis
此外，本文實現了通過瞬時運動分析和累積運動分析的方法在
火災煙氣圖像序列中提取
火災煙氣輪
廓。
The contours of the sprocket teeth are medium frequency induction hardened. all transmission clutches are of involute spline type
鏈輪齒
廓經中頻淬
火。所有換擋離合器均為漸開線花鍵齒式離合器。
All the light and graceful foliage of her character had been withered up by this red - hot brand, and had long ago fallen away, leaving a bare and harsh outline, which might have been repulsive, had she possessed friends or companions to be repelled by it
她性格中一切輕松優雅的綠葉，全都因那
火紅的徽記而枯萎，並且早已落得精光，只剩下了光禿禿的粗糙的輪
廓，如果說她還有朋友和夥伴的話，恐怕也早就為此而規避了。
Computer simulation of fire needs to solve two problems : determination of fire contour and fire texture inside the contour
計算機方法合成
火焰需要處理
火焰輪
廓和
火焰輪
廓內部的紋理。
In this thesis we deal with fire contour by use of noise function or abstracting the contour from real fire series
另一個是直接採用真實
火焰序列中提取出來的
火焰輪
廓線。
You may not always see the precise outline of an enemy, but that big puff of smoke and dust ( in the day ) or flash of flame ( at night or in low light situations ) that keeps popping up from the same location over and over again, coinciding with bullets landing nearby, can act as a great indicator to where the enemy is located
你不可能總是看到敵人的精確輪廓，但是注意那些很大一團的煙塵（白天）和槍口的火焰（晚上或微光的時候） ，它們總是不斷地出現在同一個地點，而且與彈著點相符，那麼這些東西就是敵人藏身的很好的指示器。
