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切削加工中刀具颤振的迟滞反馈控制

FEEDBACK CONTROL OF CUTTING-TOOL FLUTTERS IN MECHANICAL PROCESSES

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【作者】 何国毅何国威

【Author】 HE Guoyi(Institute for Adult Education, Nanchang Institute of Aeronautical Technology, Nanchang 330034, China)HE Guowei(Laboratory for Nonlinear Mechanics, Institute of Mechanics, CAS, Beijing, 100080, China)

【机构】 南昌航空工业学院成教学院中国科学院力学研究所非线性力学国家重点实验室 南昌 330034北京 100080

【摘要】 从金属切削加工的实际情况出发,分析了刀具在切削加工中产生颤振的原因.从力学的角度解释了刀具径向非线性颤振的机理,说明这是一种自激振荡,可以通过施加线性迟滞反馈力加以控制.这种反馈力是位移信号的迟滞函数,可以用于抑制振幅,增加刀具的平稳性.数值仿真验证了理论结果.

【Abstract】 The flutters of cutting-tools in mechanical processes are investigated in this paper. The flutters are typically self-excited oscillations and could be described by the well-known van der Pol equations. The analytical solutions of the van der Pol equations obtained by the averaging method show the mechanism of the self-oscillations. A new strategy of linear feedback is developed to control the flutters. The control strategy could be realized by a delayed linear function. The analytical solutions of the van der Pol equations with delayed linear feedback showthat the flutters could be effectively reduced. Numerical simulations confirm the theoretical predictions.

【关键词】 刀具颤振自激振荡反馈控制
【Key words】 cutting-toolsfluttersself-oscillationfeedback control
  • 【文献出处】 力学与实践 ,Mechanics and Engineering , 编辑部邮箱 ,2005年01期
  • 【分类号】TG506
  • 【被引频次】3
  • 【下载频次】166
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