基于实验模态分析的铣削加工系统动力学特性参数测试与分析

摘要

Obtaining modal parameters of a cutting system is essential for conducting dynamic simulation of milling process. The experimental modal analysis technology (EMA) is used for hammering test on a machine-tool system or a machine-workpiece system, excitation and response signals are measured and acquired by force transducer and piezoelec-tric accelerometer respectively; Then, the frequency response function of the system is obtained by Fourier transform and the frequency response function estimation method; Lastly, the modal parameters of the system are identified through orthogonal polynomial fitting method. The analysis result of dynamic characteristic parameters can provide necessary reliable data for dynamic simulation of milling process.%获取加工系统模态参数是进行铣削加工过程动力学仿真的先决条件。利用实验模态分析技术对机床-刀具系统或机床-工件系统进行锤击实验，通过力传感器和压电式加速度计采集激励与响应信号，再通过傅里叶变换和频响函数估算的方法获得加工系统的频响函数，最后通过正交多项式参数拟合获得工艺系统的模态参数。动力学特性参数测试分析结果，可为铣削过程动力学仿真提供所必须的可信数据。