Research Of Dynamics For The Rotor System Of Mechanical Impact Super Micro Mill

Mechanical impact super micro mill is one of the main equipments in non-metal mine industry. The rapidly increasing demand necessitates the development of serialization, but the trend is being blocked by lack of design theory.In this paper, the sensitivities of dynamic characteristics of the rotor system to certain design parameters has been obtained and some useful design rules has been advanced on the basis of research of dynamics for the rotor system of CM51 mechanical impact super micro mill. Firstly, based on the Lumped Parameter Method and the Transfer Matrix Method (TMM), the discrete model of the rotor system was built according to the structure of the mill. With the program of TMM run in MATLAB, the critical speeds and corresponding modal vectors were obtained. On the basis of above analysis, a program for steady-state unbalance response was composed. This program is versatile and can be used in the analysis for unbalance response of a certain rotor at any speed despite the position of unbalance. Subsequently, the finite element model of the rotor system was simulated in ANSYS. The results from the simulation approximate to those from TMM. The comparison between the two results proves that both methods can be used to analyze rotor dynamics of this kind of structure.At last, the paper focused on several important design parameters such as stiffness of bearing, diameter of basic shaft and distance between impellers and so on. With above two methods, curves for the influence of each parameter to the dynamic characteristics of the rotor system were plotted. By analyzing these influence curves, the sensitivity of each parameter can be calculated. This information will help designer find the most critical factor which determine the dynamic characteristics and optimize the design efficiently.