包邮机电英语

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简介 　　《机电英语》：高等职业教育机械大类规划教材系列。

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插图：Engineering graphics is the area of engineering which involves the application ofgraphic principles in the development and conveyance of design concepts.Engineering design is the systematic process by which a solution to a problem iscreated. Engineering graphics provides visual support, a basis for engineering analysis,and documentation for the design process.Descriptive geometry is a set of principles which enable the geometry of an object tobe identified and delineated by graphic means. It is the theory by which spatial （three-dimensional） problems involving angles, shapes, sizes, clearances, and intersections aresolved with two-dimensional representation.Computer graphics utilizes the digital computer to define, manipulate, and displaydevices, processes, and systems for the purpose of analysis, design, and communicationof engineering solutions.Geometric modeling is the representation of a concept, process, Or system operationusually in a mathematical form, and more specifically as an electronic database.Computer-based geometric modeling may conveniently be classified as wireframe,surface, or solid.Engineering graphics is in a period of rapidly changing graphics technology. Thetraditional tools of graphics, such as the T-square, compass, and drafting machines, arebeing displaced by computer hardware and software. We are in an exciting era in whichwe will experience the transition from scales, triangles, and dividers to a computerkeyboard and from blueprints to databases.The engineers of today see the engineering drawing as a by-product of the CADprocess. The control of the design-manufacture cycle is now the electronic database ofthe design. Changes are incorporated instantly in all aspects of the design. New productmodels can be quickly developed and oftentimes proved with computer simulations, thusbypassing the prototype. If drawings are desired for manufacture or documenta