Dimension Maturity Check-up And Automatic Calculation To Engineering Drawing Based On Restriction Theory And CR Graph

Dimension work is a considerably important link in the whole progress of Engineering Drawing. Products Design with no Dimension has not any significance and will have to be brought to the only end that no product can be produced. Statistical data shows, Dimension work is equal to 40-60 percent of the whole work of Engineering Drawing. Now day, many CAD systems such as ACAD software produced by Autodesk Company have strong drawing function which makes our drawing work quicker and better. However, all the check-up to dimension is by designers' handwork. If a dimension system is relatively simple, designers' check-up work is enough. If a dimension system is relatively complex, designers' check-up work which may cause mistake and miss taking place is not enough. So, using computer to realize dimension system automatic check-up is one significant thing. Dimension system check-up can be divided into three sub work: Dimension Missing check-up, Dimension redundancy check-up, Dimension Rationality check-up. The last two check-up sub work is generally called Dimension Maturity check-up. Our main work in this paper is discussing how to realize Dimension Maturity check-up. At first, we discuss and analyze experts' correlative work. And then, we propose a new Dimension Maturity check-up principle based restriction theory. In order to realize this principle, we design certain data structure named Categorized Road Graph to describe and organize Dimension system data. Using CR Graph, we design combination operation and redundancy check-up rules. We also design a progress in which we can calculate redundancy data to estimate the conflict appearance of redundancy dimension. At last, we complete a sampling system to validate the rightness of the new resolution method.