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JOURNAL OF COAL SCIENCE ENGINEERING (CHINA) DOI 10.1007/s12404-009-0000-0 pp 100-103 Vol.12 No.2 Dec. 2006 Research on virtual dynamic optimization design for NC machine tools( HU Ru-fu1,2, CUI Zhong-hua1, CHEN Xiao-ping1, SUN Qing-hong2 ( 1. School of Transportation and Traffic, Ningbo University of Technology, Ningbo 315016, China; 2. Department of Mechanical Engineering, Southeast University, Nanjing 210096, China ) Abstract Virtual dynamic optimization design can avoid the repeated process from design to trial-manufacture and test. The designer can analyze and optimize the product structures in virtual visualization environment. The design cycle is shortened and the cost is reduced. The paper analyzed the peculiarity of virtual optimization design, and put forwards the thought and flow to implement virtual optimization design. The example to optimize the internal grinder was studied via establishing precise finite element model, modifying the layout of Stiffened Plates and designing parameters of the worktable, and using the technology of modal frequency revision and the technology of multiple tuned damper. The result of optimization design compared the new grinder with the original grinder shows that the entire machine’s first orders natural frequency is enhanced by 17%, and the response displacement of the grinding-head has dropped by 28% under the first order natural frequency and by 41% under second order natural frequency. Finally, the dynamic performance of the internal grinder was optimized. Keywords NC machine tools, virtual design, dynamic design, optimization design Introduction Conventional products development requires the processes of designing, trial-manufacture of the physi- cal prototype, test, modification, retrial-manufacture, and so on. This causes long time consuming and high cost. With the rapid development of the computer technology and its widened application to mechanical engineering, new thoug