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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
【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.
- 【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