画法几何原理在空间汇交力系合成与分解问题上的应用

Applications of Principle of Descriptive Geometry to Composition and Decomposition Problems of Space Concurrent Force System

分析作用于物体上的力可以用解析法,也可以在正投影图上用图解法。图解法经常用来复核数学分析的结果,在实际工作中,利用图解法来解决某些工程技术问题往往比用解析法更为直接和简便,因而更为有效。图解法的缺点是由于工具和作图技术的限制,结果会有误差,但这种误差在工程实用的范围内,是允许的。本文介绍用画法几何原理在图解空间汇交力系问题上的应用。

Both the analytical method or the graphic method (on the front projection drawing) can be used for the analysis of the forces acting on a body. The graphic method is used often to check the obtained result by the mathematical analysis. For the solving of some problems in engineering and technology, the graphic method often is more direct and simple than the analy- tical method, and more efficient. The defect of graphic method is that the obtained results contain the error due to the limitations of drawing tools and technique, but this error can be ignored for the engineering purpose. This paper introduces the applications of the principle of descriptive geometry to the problems of space concurrent force system.