The principle of vision limit comparison tester is described. The design process and tested results of the tester performance parameters are given.
叙述视觉极限对比测试仪的原理，介绍该仪器系统的设计过程，给出仪器性能参数的实际测试结果。
The defect of limit algorithm during estimating errors in the design of processing equipment is analyzed by examples. The principle and calculating examples of Rayleigh algorithm are introduced.
通过实例分析了工装设计中采用极限计算法估算误差的缺陷，介绍了瑞利计算法的原理及计算实例。
On applying symbol modeling principle to product conceptual design, the limit of geometry expression is avoided, and the innovation and abstract requirement of product concept modeling is fulfilled.
将符号建模原理应用于产品概念设计，脱离了几何表达的束缚，满足了概念方案建模的创新性和抽象性要求。
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