Structure Design Of Shaft System In Mechanical Design

This paper derives from the research and development of detail research of structure scheme design, a sub project of the whole system. In this paper advanced design models are analyzed, and the structure characteristics of shaft system are integrated. The main functional item of shaft system is discussed.The feature propery is put forward to summarize a feature-based design model. The current situation of structure conceptual design and the existing problems are analyzed in this paper.The 14 feature items of rolling bearings are studied firstly,then the features of gear pair and shaft is abstracted.At the mean while,an reasonalble and extensible data structure is established to realize the storage of feature dataJn the feature-based design model, shaft system modules are adopted microcosmically to connect the functional concept and structural scheme, while calculate concept is employed macrocosmically to achieve the cooperation of the whole design process. The mathematic module is adopted in both single shaft and multi-shaft system to calculate the diversified shaft forms in different structure scheme.The 9 structure schemes of bevel gear pair is given out as an example.Thus according to related design module, the main flow chart of structure scheme design adapt to the real design is summarized. On the guidance of the thinking the computer aided structure scheme design system is developed and implemented. The system main flow model, data integration model, graphics building model, multi-structure scheme design module,rolling bearing design model and its sub system for detail design are constructed. These models guarantee the form of a multilayer design system contained the general structure design, data integrated in system on the base of the global design flow.Thus a fluent and user-friendly system is designed under the direction of the above description and theories.The system hierarchy model is analyzed by the Object-Oriented method. In order to enhance stability and expansibility, the system is divided to display layer, data layer, operation layer and storage layer. And it uses the interface to exchange data between these layers. The system data model is build based on Microsoft SQL Server 2000 database system. The applied software is programmed by Object-Oriented program language and ADO/OLE DB data accessing interface. At last, the system is implemented in the real example, and the practice of software in the example shows that the approaches of the paper are effective and practicable.