Study On Virtual Prototyping Of Fuze S & A Mechanism (Involute Gear Train And Straight-Sided Verge Runaway Escapement)

Computer simulation and virtual prototyping are very popular in mechanical systems, many studies focus on their concept, framework and system architecture. However, further studies of the specific system is required for integration of theory and practice. Powerful methods and tools are also needed in engineering. Based on CAD technology and multibody dynamics theory, the modeling and dynamic simulation of virtual prototype of Fuze S&A Mechanism with involute gear train and straight-sided verge Runaway Escapement are studied in this paper. The main contents are included as follows: 1) Based on the LAN and commercial software (Autodesk Inventor, ADAMS, MS SQL Server, Matlab), the platform of fuze design and product virtual development are setup. 2) The generation methods of involute cylindrical gears solid models (approximate and accurate), escapewheel accurate solid models are present. The design method of Fuze Gear Train in Runaway Escapement is studied. The generation method of random virtual prototype part considering the dimension tolerance is put forward. The geometrical algorithm library used in CAD redevelopment based on COM (Component Object Model) is established. 3) Five theory methods of multi-rigid body dynamics are summarized. The fundamental of ADAMS (Automatic Dynamic Analysis of Mechanical System) is described in detail, which includes the choice of generalized coordinates, Formulation of Equation of Motion in ADAMS, library of primary constraints, solving algorithm of equation and analysis of initial condition. The flexible bodies representation and establishment of flexible bodies kinematics equations, based on the modified Craig-Bampton method, are introduced. The contact mechanics model and contact determination criteria are summarized. 4) The data exchange effect of several meta-files format (i.e. STEP, IGES, STL) are compared, STL format is considered as the best one. On the platform of ADAMS, 2D/3D mixed dynamic simulation model of the Straight-Sided Verge Runaway Escapement is built, and its' dynamic characteristics are simulated and analyzed with considering the clearance of joint of pallet shaft and the flexible pallet shaft. 5) With the help of virtual experiment, an innovative method of determining the kinetic friction coefficient of Artillery S&A Mechanism is put forward, and the influence of different kinetic friction coefficient is also studied.