Research And Application Of Functional Digital Prototyping Technology Orient To Products Design

Innovation of product rest with product design tache mostly, and it is important to the product's quality, service and environment. Enhancing the ability of product's innovation and competition with applying the modern design method is very important to possessing market. Product digital design is one of the modern design method, and it develop fast in recent years. Digital design include the functional digital prototyping, which emphasize particularly on the functional simulation and analysis and benefit enhancing the product's function. The functional digital prototyping theory was researched and apply it to the combine harvester, the simulation, finite element analysis and optimization of the combine harvester's key parts was done.Theory foundation of functional digital prototyping are multi-Body system dynamics and finite element analysis. They were researched in this paper. Basic concept, kinematics analysis, dynamics analysis of multi-rigid-body dynamics and multi-flexible-body dynamics were introduced. The finite element theory was also introduced and the rationale and solving step of it were illuminated.The geometry modeling, feature modeling, parametric modeling and digital assembly modeling theory of the mechanic product were researched in this paper. The parametric feature modeling was adopted in the combine harvester's parts model building and the virtual assembly was done based on the solid model. Functional digital prototyping model of combine harvester's key parts and the whole machine were completed by intervention checking. It is the basic for the simulation, analysis and optimization.Digital simulation of the mechanic system was researched in this paper. The movement and dynamic simulation of the cutter and vibration sieve which key parts of combine harvester were done adopting the software ADAMS, and the simulation curve in the real condition were gained by simulating. Simulation result was validated by theoretic analysis, which provided the gist for the combine harvester design. The mathematical model of threshing of axial unit with axial feeding is established based on the probability theory, and simulated on the computer. The result of simulation shows that the model reflects the performance of the threshing unit, and provided the theory for the threshing unit design.Aim at the vehicle frame bear the weight of complex and its design is analogy design commonly, the static and dynamic characteristic analysis of combine harvester vehicle frame was finished using the finite element software, ANSYS . The vehicle frame stress in the static and braking condition were gained and analyzed, at the same time, the modal analysis of vehicle frame was done, former six order mode shape was gained and the dynamic analysis was done. The modal analysis of combine harvester's threshing unit was done to ensuring its dynamic characteristic. The former eight order mode shape were achieved, the dynamic characteristic of threshing unit was good and sympathetic vibration will not happen.The theory of mechanical structure optimization design was researched in this paper. How to done the optimization design in the ADAMS was introduced, and the optimization design of vibration sieve was done based on the simulation of it. The structure of vibration sieve was more rational after optimization. The structure optimization design of cutter asway arm was completed based on ANSYS software. The asway arm structure quality reduced obviously with satisfy the stress condition which reduced the impact and the vibration. The result of optimization was better to the former. The technology of functional digital prototyping was applied to the combine harvester in this paper. The discuss of combine harvester digital design was carried through. It have important significance to enhancing the farm machine design level, and provided one of design means and technique for the others farm machine.