在Solidworks中建立了圆锯床的整机三维模型并导入到有限元软件ANSYS中,在考虑了机床整机结合部的条件下进行模态分析,得到锯床前6阶的固有频率和振型.利用LMS振动噪声测试系统进行了锯床整机的模态测试,通过实测结果来验证理论分析的准确性.通过对比分析确定了立柱为该锯床整机结构在动态特性上的薄弱环节,并针对立柱做出了改进设计方案.使用最新的CAD/CAE集成优化软件ISIGHT对立柱结构进行参数优化设计,以立柱的前三阶模态为优化目标,经过优化循环迭代计算后得到参数设定范围内最优参数值.研究结果表明:从振型上看,有限元分析分析结果中的二、三、四、五阶模态与测试结果的一、三、四、五阶模态分别对应,固有频率数值上二、三阶模态接近实测值,四、五阶模态相差约20％.相比于初始值,第一阶固有频率提高20％左右；第二、三阶固有频率提高幅度达到50％左右.%The first six natural frequencies and the mode shapes of the circular sawing machine, with considere-tion of the various joint surfaces, were analyzed based on Solidworks and ANSYS. Subsequently, the mode tests were performed and the experimental and numerical results were compared. Furthermore, the weak point of the structure was identified and the improvement proposal was made for the column. By using ISIGHT, optimum design process was carried on for the column by takirg the first three modes as objective of optimization. The best values were found by repected iterative operation at last. The results show that the calculated 2nd, 3th, 4th and 5th modes are corresponded to the 1st, 3th, 4th and 5th tested modes. The calculated 2nd and 3th natural frequencies are identical with test values, while the 4th and 5th natural frequencies differs about 20%. In comparison to the initial values,the 1st natural frequency is enhanced by aproximately 20% while the 2nd and 3th enhanced by about 50%.
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