【摘 要】
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With the increasing demand of accuracy,reliability and stability in modern manufacturing and processing,machine tools should have higher structural dynamic performance.Aiming at the insufficient dynam
【机 构】
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School of Mechanical Engineering, University of Shanghai for Science and Technology, 200093, Shangha
【出 处】
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Asian Congress of Structural and Multidisciplinary Optimizat
论文部分内容阅读
With the increasing demand of accuracy,reliability and stability in modern manufacturing and processing,machine tools should have higher structural dynamic performance.Aiming at the insufficient dynamic performance of a vertical machining center,a new structural dynamic optimization design method is presented.First,the FEA (finite element analysis) dynamics model of the machine tool is established and the magnitude of the contact joints stiffness of the whole machine tool is worked out based on the experimental data of the modal vibration.The influence of contact joints stiffness on machine tool natural frequency is analyzed and the weak contact regions are figured out.Then the lumped mass dynamic model is developed,and the optimal design principle is derived out from the analysis results.According to the design principle,the headstock,column,bed and saddle are optimized utilizing the adaptive growth method,which is a high-efficiency structural topology optimization method based on the growth mechanism of natural branch systems,and the stiffness of the optimized parts is increased.
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