نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
In machining processes, boring bars play a significant role in manufacturing precise holes with desired surface smoothness. Vibrations of cutting tools mostly pose limitations in production. These limitations are attributed not only to the degradation of the quality of the machined surface but also decreases the tool's lifespan. Various methods, including passive and active vibration control methods, have been proposed to reduce these vibrations. The passive vibration control methods are stable, however their performance is limited with dependency on machining conditions. Direct velocity feedback control (DVFC) is an active control method in which a low computational amount is required with high adaptability to improve the performance of boring bar while reducing the vibration. Since the nature of this method has a low computational volume, a low cost hardware platform can be used for its implementation and the costs related to the control and operation of the tool inside the lathe can be reduced. In this paper, direct velocity feedback is applied with a digital accelerometer (ADXL345) and an Arduino DUE board. An active dynamic absorber is used to counteract vibrations resulting from any impact or disturbance and is compared with a condition without a dynamic absorber. Also, last, the increase in output voltage from the controller is investigated by the dynamic absorber’s performance. As a result, 64% reduction in settling time and 65% improvement in the amplitude of the Fourier transform of instrument vibrations were obtained.
کلیدواژهها English
