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An adaptronic approach to active vibration control of machine tools with parallel kinematics

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Abstract

In recent years, more and more lightweight components are used in machine tools in order to provide advantages in highly dynamic applications because of their reduced mass. One major drawback of these lightweight systems is their sensitivity to structural vibrations which are induced by high jerks during fast positioning and the machining process itself. Moreover, in case of parallel kinematic structures, the dynamic response depends nonlinearly on the actual pose of the mechanism in the workspace. In this paper, a concept for active vibration control for a machine tool with planar parallel kinematics is presented. For this purpose, an adaptronic rod has been developed and integrated into the existing machine tool. The unit consists of a high-power lead–zirconate–titanate piezo stack actuator, which is able to induce forces in longitudinal direction of the rod, and various sensors so that different control concepts from the field of active vibration control can be implemented and tested. Based on a flexible multibody system model of the machine tool, a hierarchical controller consisting of an integrated force feedback as low authority Control combined with a frequency-shaped linear quadratic regulator has been designed. The experimental results presented here demonstrate the ability of the chosen approach to clearly suppress the first dominating resonance without loss of performance in the low frequency range, which is often a serious problem of active damping concepts.

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Acknowledgments

This research was supported by the German Research Foundation (DFG) in the framework of SPP 1156 “Adaptronics for Machine Tools”, projects EB 195/7-2 and HE 1656/68-2. This support is highly appreciated.

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Authors and Affiliations

  1. Institute of Engineering and Computational Mechanics, University of Stuttgart, Pfaffenwaldring 9, 70569, Stuttgart, Germany

    Alexandra Ast & Peter Eberhard

  2. Institute of Machine Tools, University of Stuttgart, Holzgartenstr 17, 70174, Stuttgart, Germany

    Steffen Braun & Uwe Heisel

Authors
  1. Alexandra Ast
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  2. Steffen Braun
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  3. Peter Eberhard
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  4. Uwe Heisel
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Correspondence to Peter Eberhard.

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Ast, A., Braun, S., Eberhard, P. et al. An adaptronic approach to active vibration control of machine tools with parallel kinematics. Prod. Eng. Res. Devel. 3, 207–215 (2009). https://doi.org/10.1007/s11740-008-0142-0

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  • DOI: https://doi.org/10.1007/s11740-008-0142-0

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