加工中心主轴系统两点结合RCSA逆算法  

Inverse algorithm of RCSA with two coupling points of machining center spindle system

作　　者：刘宇[1] 张义民[1] 

机构地区：[1]东北大学机械工程与自动化学院,沈阳110819

出　　处：《东南大学学报（自然科学版）》2014年第1期82-86,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51105067;51135003);国家科技重大专项资助项目(2013ZX04011011);中央高校基本科研业务费专项资金资助项目(N120403011)

摘　　要：研究了加工中心主轴系统动力学特性理论预测方法,采用导纳综合子结构法对加工系统进行动力学建模.在动力学模型中,刀具和刀柄在2个单点结合,每个点具有一个横向位移自由度.两点结合的动力学模型无须考虑节点的转角自由度,因此简单可行.在求解方法上采用RCSA逆算法求解刀柄末端位移导纳矩阵,解决了刀柄结构复杂不易建模的难题和空间位移导纳有限不易测试的问题.然后进行算例研究,对长度为245,147和168 mm的刀具与相同刀柄耦合进行验证.结果表明,该RCSA逆算法能够准确求出刀柄位移导纳矩阵,并可根据刀柄位移导纳准确获得不同长度刀具安装进刀柄的复杂耦合情况下刀具末端的位移导纳.The prediction of dynamics of a machining center spindle is studied, and the receptance coupling subsystem algorithm （RCSA） is adopted to model the machining system. In the model of the machining system, the tool and tool holder are coupled at two single points, and every point has one lateral displacement degree of freedom （DOF）. This two-point model of the machining system does not need to consider the rotational degree, and, therefore, it is easy and feasible. The inverse RCSA is studied to obtain the displacement receptance of the end of the holder. It can solve the issue that the structure of the holder is complicated, not easy to model exactly and the space is narrow, and it is not easy to carry out a hammer testing. And then a case study is carded out, and three tools with the lengths of 245, 147 and 168 mm are coupled with the same holder. The results show that the inverse RCSA can exactly predict the displacement receptance of the holder. The method can be applied to predict the displacement receptance of the tool point with different lengths coupled with a complicated structural tool holder.

关 键 词：导纳综合子结构法 两点结合 逆算法 加工系统 刀尖点 

分 类 号：TH113.1[机械工程—机械设计及理论]