Experiments on a beam-rigid body structure repetitively impacting a rod |
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Authors: | Elizabeth K Ervin Jonathan A Wickert |
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Institution: | (1) Department of Civil Engineering, University of Mississippi, University, MS 38677, USA;(2) Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA |
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Abstract: | This paper investigates the experimental dynamics of a beam structure that supports an attached rigid body and that can impact
a comparatively compliant base structure. The problem area is motivated by impact phenomena that are observed in certain structures
internal to nuclear reactors. The assembly is subjected to base excitation at specified frequency and acceleration, and the
resulting displacement and velocity time histories are recorded and used to obtain spectra, phase diagrams, and Poincaré sections.
The measurements validate simulation results obtained by using a constraint and modal mapping method based on the two sets
of modes when the structure is in-contact, and when it is not-in-contact. Generalized coordinates are mapped across the impact
discontinuities in the modal representation. The forced response simulation predicts the test specimen’s response over a range
of excitation frequencies. The specimens are fabricated as single integral structures from acrylnitrile butadene styrene plastic
through rapid prototyping technology in order to eliminate the undesirable dissipation and flexibility arising from joints
and connections. The experimental system can exhibit complex response characteristics, and the influences on complexity of
deadband clearance and of asymmetry in the point of impact are examined in the experiments. |
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Keywords: | Beam Vibration Discontinuous Experiment Impact Mapping Asymmetry Deadband |
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