Feed drive control tuning considering machine dynamics and chatter stability |
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| Affiliation: | 1. Dynamics & Control Department, Ideko, Elgoibar, Basque Country, Spain;2. Precision Controls Laboratory (PCL), University of Waterloo, Waterloo, ON, Canada;1. Dynamics and Control, Ideko- Member of BRTA, 20870 Elgoibar, Basque Country, Spain;2. Deparment of Applied Mechanics, Budapest University of Technology and Economics, Budapest H-1521, Hungary;3. Department of Mechanical Engineering, University of the Basque Country, UPV, Basque Country, Spain;1. Department of Mechanical Engineering, National Chung Cheng University, No.168, Sec. 1, University Rd., Minhsiung, Chiayi 62102, Taiwan ROC;2. Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan ROC;1. Institute for Machine Tools and Industrial Management (iwb), TU Munich, Boltzmannstr. 15, 85748 Garching, Germany;2. inspire AG, Technoparkstr. 1, 8005 Zurich, Switzerland;3. Institute of Machine Tools and Manufacturing (IWF), ETH Zurich, Leonhardstr. 21, 8092 Zurich, Switzerland |
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| Abstract: | In large machine tools, where structural dynamics significantly influences the cutting stability, judicious selection of the servo control parameters can increase the damping, thereby improving the chatter stability. This paper presents a new strategy for feed drive controller tuning, which takes this effect into consideration. The proposed strategy generalizes successfully to machine tool structures with high order dynamics, and integrates model-free frequency domain estimation and analysis techniques with model-based root locus design, the latter which is achieved through an efficient and accurate identification approach. The proposed strategy has been tested in machining stability tests, demonstrating up to 30% increase in productivity. |
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