外文文献及译文 文献题目：Traditional car body and modern car body design method 文献来源： Taylor&Francis 文献发表日期： 2011年06月17日 学生姓名： 学号： 系 别： 专 业： 指导教师： 职称： 2017年5月19日Traditional car body and modern car body design method1、Traditional car body design methodThe autocar car body shape is one of the three greatest fractions that are paralleled with bedrock and engine in the autocar structure, its development and capacity preparation cycle is the longest, and the preparation work of chart paper and craft is the biggest, and it is usually still need to remodel, unlike bedrock and engine attain which is easy to reach serialization and generalization.The characteristics of car body structure lies on the constitution of car body shape of each null parties be big for size more but shape complicated space curved face(namely so-called person type overlay piece), these space curved faces can not be used ordinary machinery drawing method will it the complete earths surface appear, as a result have to create stereoscopic pattern as basis. For making these chart paper and change a type tangibly express shape and structure of car body, need to pass a complicated design process to complete.In the traditional car body design, the design information and the data of car body deliver mainly by two-dimensional chart paper and principal mode type, there are many design fraction of persons hand work. The defects that traditional design method can not overcome embody at as follows a few aspects:1）、The manpower resource consume greatly. The traditional car body designs a tapping requirement the art designing personnel, engineering the technical personnel and its operative make a concerted effort, such as the creation and conservancy, molding tool of the two-dimensional engineering chart (the plot of car body graph), soil pattern design, production, grind to go together with and adjust to try, capacity prepare medium process planning etc.s will expend a person quantitative manpower and resource.2）、Designing accuracy is low, the cycle is long. Accuracy low and main reasons lying in the information of each link that designs with born reserve to deliver is a kind of “move a shape, For example from lord draftion board manufacture principal mode Xing, is carried on by the principal mode type to process craft supplement, production craft pattern, from convex of the craft pattern turn over into concave craft pattern, again is depended by the craft pattern anti to process trimming die, after the convert of these links, raw datas the error of various factitiousness unavoidable, cause the molding tool accuracy of processings canning not assure, only depend next move of the hand work grind to go together with to clinch.3）、Car body already set over speedy and the incapability carry on proceed together design. Traditional car bodys designing is basically a kind of one-way anti reversible design status, product once already set, modification or remodel very difficult, the universal turns, the series turn a degree low.In addition, the car body of the modern autocar null parts because of the requirement of structure and beauty, the space curved face gradually complicates, traditional design method F very difficult satisfy design request.2、Modern car body design methodAs design and modification of autocar car body shape request gradually increasing higher requirements, the parameter designment match more and come closer to the conceptual design in modern CAD and proceed together design thought, and can develop the flexibility of design and analysis, therefore the parameter of the car body craft shape design have already become a inevitable trend of vehicle production. The traditional hand work shape method has already been replaced by Computer aided modeling method which is base on various of advanced modeling soft wares, Parametric design technology can quickly absorb the foreign autocar car body designs of advanced technique, quickly respond to a market, upgrading the capability of independence design and improving autocar product competitive power in our country. Since 70s in last century, along with the increasing development of computer aided geometric design and Computer graphics, the car body designs process mid for decide or the whole distances lead into calculator supporting system (CAD/CAM software), the garbage sets up car body 3D digitize pattern, with” hat you see is what you get of alternate mode the perfect design scheme is the main features of modern car body design method. The basic process is following: After investigating the market, forming a car type of whole request; Manufacture hand-drawing effect chart, also available calculator assistance the software dra