参数化、变量化设计已成为现代CAD／CAM系统的核心技术。
Parametric design and variational design are the key technology in the modern CAD/CAM systems.
变量化技术是当代CAD技术的核心，以实现变量化设计为目的的几何约束求解有多种方法，但它们都存在一定的局限性。
Variational design is the kernel of contemporary CAD technology. There are many solving methods for geometric constraint solving at the aim of variational design, but they all have some limitations.
运用图形CAD系统的变量化设计思想，结合图形特征，基于软件工程中的面向对象设计方法，开发了轮胎胶囊及模具CAD软件系统。
Combined with the characters of the graphics and variational parameters, a CAD system was developed, based on object oriented method for designing tire bladder and its mould.
本文的研究表明，通过这种方法确定的优化变量可以提高优化结果的准确性与高效性，并且取得了良好的优化效果，从而使车身轻量化设计更加高效实用。
The research in the thesis indicates that optimization variables calculated by this method can improve accuracy and efficiency of the results. So the whole design can be more efficient and practical.
本文的研究表明，通过这种方法确定的优化变量可以提高优化结果的准确性与高效性，并且取得了良好的优化效果，从而使车身轻量化设计更加高效实用。
The research in the thesis indicates that optimization variables calculated by this method can improve accuracy and efficiency of the results. So the whole design can be more efficient and practical.
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