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Chatter Reduction in Turning by Using Piezoelectric Shunt Circuits

机译：使用压电分流电路转弯的颤动减少

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In this paper, the effect of piezoelectric shunt damping (PSD) on chatter vibrations in turning process is studied. Chatter is a self-excited type of vibration that develops during machining due to process-structure dynamic interactions resulting in modulated chip thickness. Chatter is an important problem, since it results in poor surface quality, reduced productivity and reduced tool life. The regenerative chatter results from phase differences between two subsequent passes of the cutting tool and occurs earlier than mode coupling chatter in most cases. In regenerative chatter theory, stability limit in the cutting process is inversely proportional to the negative real part of frequency response function (FRF) of the cutting tool-workpiece assembly. If the negative real part of the FRF at the cutting point can be decreased, depth of cut, in other words productivity rates, will increase. In piezoelectric shunt damping method, an electrical impedance is connected to a piezoelectric transducer which is bonded to the main structure. In this study, resistive - inductive - capacitive shunt circuit is used, whose elements are optimized with genetic algorithm to minimize the real part of the FRF for certain target frequencies. Afterwards, the effect of the optimized piezoelectric shunt damping on the absolute stability limit of the cutting process is investigated.
机译：本文研究了压电分流阻尼（PSD）对转动过程中颤振振动的影响。 Chatter是一种自我激励的振动类型，在加工过程中开发由于过程结构的动态相互作用导致调制芯片厚度。 Chatter是一个重要的问题，因为它会导致表面质量差，生产率降低和刀具寿命减少。再生颤壳从切割工具的两个后续通行证之间的相差产生并且在大多数情况下比模式耦合颤动更早地发生。在再生喋喋不休理论中，切割过程中的稳定极限与切削工具工件组件的频率响应函数（FRF）的负实实数成反比。如果切割点的FRF的负实部分可以减少，则切割深度，换句话说，生产率率将增加。在压电分流阻尼方法中，电阻抗连接到压电换能器，该压电换能器粘合到主结构上。在该研究中，使用电阻电容 - 电容式分流电路，其元素用遗传算法进行了优化，以最小化FRF的真实部分，以实现某些目标频率。然后，研究了优化的压电分流器阻尼对切割过程的绝对稳定性极限的影响。

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