机床结合部参数的有效识别方法

The Efficient Identification Method of Joint Parameters of Machine Tools

在机械阻抗综合法的基础上推导出一种直接利用结构实测频响函数识别结合部参数的方法，通过多频率点的最小二乘法消除噪声的影响，提出了当结合面响应不能直接测量时的处理办法．该方法原理清晰，不需预先建立结构的解析模型（如有限元模型），试验及测试计算都较为方便，尤其适用于大型复杂组合结构（如机床）结合部参数的识别．该方法在云南省科委八五攻关项目《Ｘ８１４０铣床动态设计》中用于对昆明铣床厂试制新产品×８１４０样机八个主要结合部参数的识别，得到了比较满意的结果．

The method of identification of the joint parameters of machine tools is discussed on the basis of impedance synthesis method in this paper.A method is derived by direct use of practical measured frequency-response function to identify the joint parameters.And the noise influence is depressed by the least square method of multi-frequency points.A treatment method is proposed for the case that the joint response are not directly measured.The method has the following advantages:the principle is clear,and the analytic structure model(eg.finite element model) is not needed in advance.And it is more convenient for measuring and caculating.which is especially suitable for the identification of joint parameters of big complicated combined structures(eg.machine tools).The identification of the joint parameters of main eight joints of universal miller X8140 is fufilled as well,and a good result is obtained.