摘要
为提升机床的动态特性,进而提高机床加工精度,稳定性和抗振性,首先对某机床进行模态试验,分别采用最小二乘复指数法和最小二乘复频域法识别模态参数,并对识别结果和识别效果进行对比分析,得出准确的低阶固有频率,阻尼比和模态振型。再根据振型分析确定了机床加工精度低的主要原因和薄弱环节,并提出相应的改进意见,为动力学优化设计指明方向。
In order to improve the machine tool＇s dynamic characteristics, which increases its machining precision,stability and vibration resistance,the modal experiment of a machine tool is performed firstly,Least Square Complex Exponential method（ LSCE） and Least Square Complex Frequency method（ LSCF） have been used to estimate modal parameters,then the estimate results and effect are compared and analyzed,and the resonant frequencies,damping value and mode shapes of lower modes accurately are obtained. According to the analysis of modal shapes the main reasons for the low machining precision and weak link of machine tool are carfinmed, the corresponding improvement suggestions are proposed,and the direction for dynamic optimum design is indicated.
出处
《机械设计与研究》
CSCD
北大核心
2014年第6期106-108,117,共4页
Machine Design And Research
基金
国家自然科学基金资助项目(1010200220120102)
关键词
机床
试验模态
结合面
薄弱环节
machine tool
experimental modal
joint interfaces
weak link
