Constructing a constraint net during the modeling stage of aircraft product design

During designing the aircraft product, it´s important to have a good model for the designer. Traditional model of aircraft doesn´t validate the information stored in the knowledge base. There are some works on constraints net now, but the algorithm and the procedure is very complicated. There is not a constraint description language and a general way to represent the constraints on model. In this paper, we build an aircraft product model based on knowledge base in the concurrent engineering way. We use the PAL (Protégé Axiom Language) and our extended Java code to describe the constraints and construct a constraint net. The knowledge base model with constraint net describe product itself with more accuracy than traditional model. The aim of this research is reducing the time and cost to improve efficiency of aircraft product innovation.