Comparison between different controllers when having abrupt changes in a process

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Henrik Åkesson, Tatiana Smirnova, Lars Håkansson, Ingvar Claesson, Thomas L Lagö
Title: Comparison between different controllers when having abrupt changes in a process
Translated title: Jämförelse mellan olika kontrollers med plötsliga förändringar i processen
Conference name: Active 2006 (The Sixth International Symposium on Active Noise and Vibration Control)
Year: 2006
City: Adelaide
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
Authors e-mail:
Language: English
Abstract: When metal cutting is performed, the machining processes introduce productivity degrading vibration. By applying an active control scheme, theses vibrations can be reduced significantly with the result of improved surface finish of the work piece and increased tool life. Due to the large difference of boundary conditions during the machining process, a controller fast enough to follow these changes is needed, for example from no cutting to cutting - the actual engagement of the cutting process. If the controller does not success to follow fast enough, the tool tip might break, as is the case without any active damping. Different approaches based on feedback control are investigated; all implemented using an active boring bar. The first approach is based on a digital adaptive feedback controller; the feedback filtered-X LMS algorithm. The two other controllers are analog; one is a lead controller and the other is lead-lag controller, both with gain and phase orthogonally adjustable. This paper focuses on robustness, stability and convergence of the digital and the analog feedback controllers. The analysis is based on open loop frequency response function estimates during different operating conditions.
Subject: Signal Processing\Active Noise and Vibration Control
Mechanical Engineering\Structural Dynamics
Keywords: Active, Adaptive, Control