基于试验模态法的五轴水射流机床动态特性研究

基于试验模态分析理论,运用力锤激励法对五轴联动水射流机床整机进行单点激励(SISO)结构模态试验;结合响应信号,构建试验模态分析系统,获得了整机结构的低阶固有频率、阻尼比和相应的模态振型,并通过模态置信准则(MAC)进行验证;通过振动试验分析可知,机床第一、二、三阶振型为其主要振动,并找出其了振源,提出了相应的措施,以降低振动。

Research on Dynamic Characteristics of Five-Axis Water-Jet Machine Based on EMA

Based on experimental modal analysis theory, with the method of force-hammer excitation adopted, a single-input-single-output (SISO) structural modal experiment has been conducted on five-axis linkage water-jet whole machines. Combined with the response signal, an experimental modal analysis system has been established, thus acquiring the low-order inherent frequency, the damping ratio and the mode shapes of the whole machine structure, which are to be verified by the modal assurance criterion. A vibration test analysis shows that the first, second and third vibration modes are the main vibration patterns, with its vibration source to be successfully located and some corresponding measures to be taken so as to achieve the purpose of reducing vibration.