By using the geometric constraint, the dimension constraint, the dimension equation and the dimension driving techniques of CAD, the typical simulation mechanisms are created.
采用CAD的几何约束、尺寸约束、尺寸方程和尺寸驱动技术，针对根据一些典型平面多自由度机构，构造出相应的模拟机构。
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.
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。
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