Adaptive Active Control of Machine-Tool Vibration In a Lathe

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Ingvar Claesson, Lars Håkansson
Title: Adaptive Active Control of Machine-Tool Vibration In a Lathe
Journal: International Journal of Acoustics and Vibration
Year: 1998
Volume: 3
Issue: 4
Pagination: 155-162
ISSN: 1027-5851
Organization: Blekinge Institute of Technology
Department: Dept. of Signal Processing (Institutionen för signalbehandling)
Dept. of Signal Processing S-372 25 Ronneby
+46 455 38 50 00
Authors e-mail: lha@bth.se, icl@bth.se
Language: English
Abstract: In the turning operation the relative
dynamic motion between cutting tool and workpiece, or vibration, is a
frequent problem, which affects the result
of the machining, and in particular, the surface finish. Tool
life is also influenced by vibration. Noise in the working environment
frequently occurs as a result of dynamic motion between
the cutting tool and the workpiece.

With proper machine design, i.e. improved stiffness of the machine
structure, the problem of relative dynamic motion between cutting tool and workpiece may be
partially solved. However, by active control of machine-tool
vibration, a further reduction of the dynamic motion between cutting tool and workpiece can be
achieved.

It was found
that adaptive feedback control of tool vibration in the cutting speed
direction, based on
the filtered-x LMS-algorithm, enables a reduction in
vibration, by up to 40 dB at 1.5 kHz, and by approximately
40 dB at 3 kHz. It was also observed that the introduction of leakage in
the filtered-x LMS-algorithm improved the stability properties of the
feedback control system. A significant improvement in the workpiece
surface was observed and a substantial improvement in the acoustic noise
level was obtained with adaptive control.
Subject: Signal Processing\Active Noise and Vibration Control
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