Reasearch Of Methods In Specified Type Products Collaborative Design Based On Workflow

Collaborative design which has an important role in shortening development cycle and reducing manufacturing cost, is the key technology of realizing networked manufacturing for specified type product. The considerable challenges and difficulties suffered from collaborative design of product involved in the high safety level, highly complexity, long periodicity, single and small batch, and achieve practical application.The research background of this dissertation is against the background of the Pre-research project supported by the General Armament Department. This dissertation presents some theoretics and methods of type product collaborative design based on the workflow. The purpose of this study is to explore some strategies and approaches to slove problems for type product collaborative design and to provide theoretical methods and technical support for the next generation type product. The main research contents and results are as follows:(1)Based on workflow model of collaborative design three-dimensional distribution, a workflow-based access control model is designed for the classification of resource sharing and to meet management requirements for collaborative design. For the characteristics of the high security level, data mobility and flexibility for type product, collaborative design access control adhibit the definition of mission and separately define one security-level which has read/write secret levels and read/write category for the role and operational resources based on RBAC. And define the nine security policies to meet the selection of the actual situation. An access control model which introduces task is designed. The aileron case analysis shows that the model can meet the resource access control requirements.(2)For the problem of evaluating the collaborative design progress in the workflow process, an evaluation method of design maturity is presented. First of all, the definition and its evaluation method of design maturity based on workflow are cleared and the factor sets which impact design maturity are structured. Then to solve the solution problems of product feature sets, the hierarchical triangular fuzzy number HoQ is introduced to achieve the transformation from the users' needs to the factor sets of each phase. Finally an improved nine-scale group multi-criteria fuzzy evaluation method is proposed to integrate the expert opinions and de-fuzzy. The simulation calculation of the design maturity of an aileron shows the effectiveness of the proposed method.(3)For the problem of the safe and efficient data transmission in the workflow process, a difference analysis method of CATIA 3D CAD model files is proposed as a basis of achieving version management in collaborative design. Analyzing the feature attribute, organizational models and operational mothods of CATIA 3D CAD model files, based on the comparable solution stratege of text strings, the feature extraction algorithm is designed to transfer the binary code to the recognizable string. And then the difference analysis algorithm is designed to achieve the comparision of strings. Finally the feature reconstruction algorithm is designed and rendering the reconstruction file, then the difference analysis of CATIA 3D CAD model files is also achieved. The case analysis of the base shows that the method can quickly analyze the two version files while effectively reducing the network traffic flow and ensuring transport security.Take the wing flutter model as an example, the theory and methods are validated in the developed prototype system. And the above proposed theory and methods are also expected to be applied to collaborative design of other arears, such as aviation, aerospace and defense military products.