Dynamic Analysis Of Feeding Transmission System Of Machine Tool Based On Virtual Prototyping Technique

The feeding servo system is a key part of Numerical Control Machine Tool. The dynamic characters of feeding transmission parts not only directly affect working capability and machining precision of a machining tool,but also influence orientation precision of feeding system. In addition, mechanical design of machine transmission parts will also affect servo capability of feeding servo system greatly. Modern numerical control machine tool trends toward to high speed, high efficiency and high precision. The designing requirement for machine tool feeding transmission parts has been higher and higher. It is usually because that the dynamical characters of machine transmission parts is not taken into account in the phase of designing, servo capability is influenced.Virtual prototyping technology for mechanical system is also called dynamic simulation technology of mechanical system. It's a kind of computer aided engineering (CAE) technology, which is developed with the rapid update of computer technology in the 1980s.Virtual prototyping technology is mainly used to deal with the kinematics and dynamics analysis of mechanical system, it uses CAE technology to do this to compute the position, velocity and acceleration of the system and it's every part at any time. At the same time, it educes the action forces and reaction forces the system and it's every part's movement needed by solving the system of linear algebraic equations.ADAMS is the most famous virtual prototyping software. One side, it's the applications software of virtual prototyping analysis. On the other hand, it's the quadric exploitation tool of virtual prototyping analysis.ADAMS uses Lagrange equation to build the dynamics equation of the system. It selects three right-angle coordinates of the centroid of every rigid body in the system in inertia reference frame and three Euler Angles which used to ensure the orientation of the rigid body to be Descartes generalized coordinates, then it uses Lagrange equation with multipliers to deal with holonomic mechanical systems and nonholonomic mechanical systems with several coordinates to educe the motion equation which uses Descartes generalized coordinates as variables.Adopting technique of virtual prototype in study of design of feeding system can realize emulation that the running state of each mechanism under various working conditions of electromotor which output varies torsion according to time. Results from the emulation are used to estimate and judge different data of actual movement. It also has some reference value for the dynamic analysis and calculation of feeding system of NC Machine Tool.This paper analyses the dynamic characters of feeding system by theory analysis and virtual prototyping simulation, and get a same results. This proves that the result of virtual prototyping simulation is correct, and provides foundation for usage of virtual prototyping technique in feeding system of NC Machine Tool. This paper has some applied value for design of feeding system of NC Machine Tool and application of virtual prototyping technique in practice.This article is divided into six chapters altogether, the first chapter introduces the composing of feeding system of NC Machine Tool and development of virtual prototyping technique; The second chapter introduces multi-body system dynamics and ADAMS code; The third chapter makes dynamic theoretical model for feeding system with Lagrange method; The fourth chapter builds the three-dimension model of feeding system and make mode analysis for critical parts; The fifth chapter takes a simulation for rigid-flexible coupling model and contrasts results with theoretical analysis; The sixth chapter draws out the conclusion , and point out the deficiency of this article.