Active Control of Boring Bar Vibrations in Cutting Operations

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Linus Pettersson, Lars Håkansson, Ingvar Claesson, Sven Olsson
Title: Active Control of Boring Bar Vibrations in Cutting Operations
Conference name: The 9th International Congress on Sound and Vibration
Year: 2002
Organization: Blekinge Institute of Technology
Department: Department of Telecommunications and Signal Processing (Institutionen för telekommunikation och signalbehandling)
Department of Telecommunications and Signal Processing S-372 25 Ronneby
+46 455 38 50 00
Authors e-mail: lar@bth.se, lha@bth.se, icl@bth.se
Language: English
Abstract: Internal turning or boring operations have a history of being a cumbersome manufacturing process. The manufacturing industries are facing tougher tolerances of their product surfaces and a desire to process hard to cut materials and therefore the vibrations must be kept to a minimum. An increase in the
productivity is also interesting from a production point of view. When cutting in pre-drilled holes the boring bar is usually long and slender and is thereby inclined to vibrate destructively concerning the machining result. The knowledge of the vibrations involved in boring operations and active control of external turning operations, have given a good basis for the active control solution in boring operations. The active control solution is based on a standard boring bar with an embedded piezo ceramic actuator placed at the peak modal strain of the boring bar. An accelerometer is also included in the design, mounted as close as possible to the cutting tool. The control algorithm is a filtered X LMS algorithm built on a feedback approach since the original excitation, the cutting process, cannot be observed directly. Preliminary results show reduction of the vibration in the boring bar by up to 30dB.
Subject: Signal Processing\Active Noise and Vibration Control
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