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Model and Parameter Study of a Shape‐Adaptable Beam for Vibration Control
Author(s) -
Nowak Alexander,
Willner Kai,
Hasse Alexander
Publication year - 2018
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201800465
Subject(s) - stiffness , vibration , beam (structure) , modal , hull , structural engineering , context (archaeology) , normal mode , vibration control , modal analysis , engineering , materials science , acoustics , physics , geology , paleontology , polymer chemistry , marine engineering
Shape adaptation is an effective approach for vibration damping. In this context, a numerical model of a slender, shape‐adaptable beam is introduced. The beam is essentially an arrangement of compliant ribs which are interconnected by a hull structure. The compliant ribs are characterized by at least two desired deformations modes with a low modal stiffness, whereas the remaining modes are considerably stiffer. By actively exciting the first desired deformation mode, the cross‐sectional stiffness of the beam can be altered between a low and a high stiffness state and therefore, the vibration behavior of the beam can be influenced. In detail, this paper presents a surrogate model of the compliant ribs which easily allows for modifying the stiffness properties of the ribs by a low number of parameters. The surrogate model is integrated in the FE‐modelled hull structure in order to simulate the 3D behavior of the entire structure. The influence of shape adaptation on the dynamic behavior of the free vibrating beam as well as for excited oscillation is examined. Especially, modal energies and their transfer between the modes due to the shape adaptation are considered. In addition, we are conducting a study on the parameters of the surrogate model in order to gain a deeper insight into the complex interrelationships of vibration reduction through shape adaptation.