Study And Application Of Helicopter Collaborative Design Based On Digital Mock-Up

Helicopter is a highly complex aviation product with a wide range of technologies and highly comprehensive, so its development is very difficult. In order to meet the need of rapid growth of Chinese helicopter and obtain competitive advantages from market, Helicopter enterprise should develop helicopter products with high quality and low cost in a relatively short time to meet customer's needs. Using the helicopter collaborative design means based on digital mock-up (DMU) is one of the important ways to success.Firstly, the related researches and applications of helicopter DMU and collaborative design are analyzed and the current main requirements of helicopter design in China are dissected. With the support of the project of digitalization engineering for aircraft manufacturing Industry, several key technologies of helicopter collaborative design based DMU are studied.(1) For the requirement of helicopter DMU rapid changes, the expression method of model link relationship (MLR) and the calculation algorithm of MLR for helicopter DMU are proposed. With external reference or the directly conjunction among geometrical elements and parameters in DMU models, the MLR are established. The graph of model link relationship (GMLR) is employed to express the correlative connection among digital models, and the algorithms of DMU models change impact analysis and rapid change based on GMLR are designed. They are used to analyze the influence to DMU models caused by some models'change and to implement rapid changes of DMU models affected.(2) For the needs of process control for helicopter collaborative design, the method of the evaluation and control of design maturity for helicopter variable configuration item (VCI) is proposed. Based on the analysis of the evaluation factors in five aspects: function, geometric digital model, manufacturability, maintainability and attributes of helicopter VCI, the index system for its design maturity evaluation is established according to the characteristics of helicopter VCI in which there are closely related many factors. The evaluation model, process and algorithm for the design maturity of VCI are proposed to quantify its mature during the development of helicopter. Combination of helicopter design practice, the control rules of design maturity of VCI and whole aircraft are put forward.(3) For the requirement of efficient coordination of helicopter DMU, the algorithm of spatial region calculation and search for helicopter DMU is proposed. The features of DMU spatial region are analyzed and the bounding volume hierarchical tree of axis aligned bounding box (AABB) is applied to express DMU region. The algorithms of automatic spatial region calculation and spatial region search based on AABB hierarchy are developed. In light of the actual review of helicopter DMU, the principle of region partition for helicopter DMU is summarized and the corresponding review process for DMU region based on DMU region search are established.Lastly, the overall functional framework and the information models for the application system to implement collaborative design of helicopter based on DMU were proposed. The technologies presented in this thesis were employed successfully to develop some civil helicopter. The application effect demonstrated that: (a) the design in context process of DMU under the support of express method and calculation algorithms of MLR was used to design and change of helicopter DMU, the cycle of the helicopter DMU change was shortened; (b) The mechanism of evolution control was used to achieve rapid design evolution for helicopter DMU based on the maturity gate which was measured by the evaluation of helicopter VCI; (c) The application of mode of collaborative design of helicopter DMU based on region filter improved the review of helicopter DMU. The application effect demonstrated also the effectiveness of the server key technologies about the helicopter collaborative design based on DMU.