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Self-tuning velocity feedback control for a time varying structure using a voltage driven electrodynamic inertial mass actuator

: Rohlfing, Jens; May, Thomas; Walter, L.; Millitzer, Jonathan

Volltext (PDF; )

Sas, P. ; Katholieke Universiteit Leuven, Departement Werktuigkunde:
ISMA 2016, International Conference on Noise and Vibration Engineering. Proceedings : USD 2016, International Conference on Uncertainty in Structural Dynamics; 19 to 21 September, 2016, Leuven
Leuven: KU Leuven, 2016
ISBN: 978-90-73802-94-0
International Conference on Noise and Vibration Engineering (ISMA) <27, 2016, Leuven>
International Conference on Uncertainty in Structural Dynamics (USD) <6, 2016, Leuven>
European Commission EC
Advanced Training and Research in Energy Efficient Smart Structures
Konferenzbeitrag, Elektronische Publikation
Fraunhofer LBF ()

This paper presents research work on self-tuning velocity feedback control units with voltage driven electrodynamic inertial mass actuators (IMAs). Due to the IMAs dynamics such feedback loops are only conditionally stable. Feedback compensators can improve the feedback loop stability. In the literature often ideal current driven IMAs are assumed, while most practical power amplifiers are actually voltage sources. In this paper a feedback compensator for voltage driven IMAs is derived and experimentally validated. The primary structure considered is a base excited single degree of freedom system with variable stiffness. For each stiffness setting there is a specific feedback gain setting that provides optimal control performance. Therefore a self-tuning algorithm is developed that tunes the feedback gain to minimize the kinetic energy of the primary structure, while also considering the stroke and current limits of the IMA. The self-tuning algorithm is experimentally validated for different natural frequency settings.