防湿背雨伞设计报告说明书下载 - 北华航天工业学院.docVIP

　　 　 　　 科研成果设计报告说明书　　　　　　　　　　　　2008年6月16日 　　　　　　　　　　 　　　 　 　　 　 　　　　　　　　　“前短后长”不对称设计，外形本身成流线形，可以减小风的阻力和雨水在伞面停留的时间。可以节省使用者的力气。在流线形设计下，伞面经常保持干爽。 这种设计有自己的独特性，个性化。它也加入了一些环保的功能，符合现在的环保意识。　　 　　　　　　 　　 　　　This kind of umbrellas umbrella cover contour resembles flies the swallow, front main umbrella ribs are shortest, the middle four main umbrella ribs are slightly long, the surface two main umbrella ribs are then longer, cause its rear part likely swallows tail. Its umbrella handle is installs in the around straight line gold break point place, but this spot close swallow umbrella handle is uses pulls out pulls the type design, may reduce the folding space. Ratio of middle to outside this kind of proportion is quite artistic in the modelling, when like this opening an umbrella hand-hold umbrella, the umbrella cover center happen to falls on its top of the head. Such umbrella obstructs the rain area to increase greatly effectively, moreover during the guarantee opening an umbrella line of sight will not be obstructed, the opening an umbrella back the rain water which trickles by the umbrella cover will not get wet. 　 This kind resembles flies the swallow contour umbrella cover design, after before the umbrella awning use, short, is long is asymmetrical designs, a contour itself tenth streamline shape, may reduce the breeze the resistance and the rain water the time which pauses in the umbrella cover. May save users strength. Under the streamline shape design, the umbrella cover maintains dry and clear frequently. 　 This kind of design has own distinctive quality, the personalization. It has also joined an environmental protection function, conforms to presents environmental consciousness. 　　 Khe opening an umbrella back the rain water which trickles by the umbrella cover will not get wet. Ratio of middle to outside.　　 　 　　 　　 　 　　　　　　　　　　　　　　　 　　 Ⅰ　　 Abstract Ⅱ　　　　　 绪论 1　　　 1　　　 2　 2　　 第2章 雨伞姿态表示和计算 2　　　 2　 2.2 雨伞计算 6