Mechanical model of a mistuned 2DOF-structure coupled by viscous damping |
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| Authors: | Jacob Laborenz Christian Siewert Lars Panning Jörg Wallaschek Christoph Gerber |
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| Institution: | 1. Institute of Dynamics and Vibration Research, Leibniz Universität Hannover, Appelstraße 11, 30167 Hannover, Germany;2. ALSTOM Power, Steam Turbines and Generators, Brown Boveri Strasse 7, 5400 Baden, Switzerland |
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| Abstract: | In this paper the vibration amplitude reduction of a mechanical system is investigated when applying a damper between different DOF of that structure. Thereby, an elementary mechanical model consisting of two mass-spring elements with slightly differing eigenfrequencies and which are connected via a viscous dashpot damper is regarded. To investigate the systems behavior, an analysis of the transfer function and its poles and zeros in the L APLACE domain is performed when varying the damping constant. This reveals that the achievable amplitude reduction depends on the mistuning of the system and that even ideal viscous damping leads to a coupling which results in a shift of eigenfrequencies. (© 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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