The Experimental Modal Analysis Method's Applications In Surface Grinder Type MSY7115 And Its Dynamical Modification

With the development of modern science& technology and the improvement of manufacturing technique & advanced tool, machine tool should have the capabilities of high production efficiency and accuracy. In order to fulfill the requirements of the modern production, the structure of machine tools should have corresponding satisfactory dynamic characteristics. Today the analysis and study of dynamic characteristics of structure occupy an important place on design and manufactory of new type machine tools.Based on the technology of structure's Experimental Modal Analysis, noise and vibration signal of grinding machine (Type MSY7115) under working condition were picked up and analyzed in this thesis. Through the analysis, frequency characteristic spectrums of the grinding machine under working condition have been determined. The structure of the grinding machine was excited relatively with the electrical magnetic excitatory mounted between the simulated emery wheel and workpiece with the steady-state harmonic signal, the main modal frequencies which are harmful to the accuracy of grinding have been identified by the modal test. Based on the analysis technique of structure's pseudo-real modes, the first eight orders of modes have been identified. Through the synthetic analysis of the vibration vein frequencies on produced workpiece and the main modes of structure, the principal parts producing the grinding vein have been obtained.Using the results of above analysis, the FEA analysis model of the principal parts have been established by means of the advanced software WORKING MODEL 4.0 (MSC Corporation) with dynamic simulation and analysis by the adjusting parameter technology. And the FEA models of principal parts have been modified in order to diminish the veins on produced workpiece.From 1960's to now, with the rapid development of computer technology, dynamic analysis theory of structure and test technique, dynamic design of machine tool structures is provided with a new computer assistance and optimizing design condition.Main studies of this thesis are based on the item, which is the Important Municipal Science& Technology Plan provide by the Commission of Kunming Science &technology. The most works of this thesis areaccomplished with the design department of Yunnan SanLong Manufactory Group. The aim of this thesis is to explore applications of modal experimental analysis, computer simulation and dynamic optimum design of machine structures on the assigned design goals. The study of this thesis has basically got a satisfactory result, and make out a road for design & manufactory departments. A whole project for similar kinds of problems has been made out.