Abstract
The dynamics of a structure excited by a non-ideal excitation device, such as a DC motor with limited power capacity, is considered in this paper. When non-ideal excitation sources are attached to structures that consume energy at levels similar to the source power capacity, some characteristic phenomena such as jumps can occur. These behaviors are related to the Sommerfeld effect, where a part of the excited system behaves as energy sink. One of the problems often faced by designers of such structures is how to drive a system through resonance and avoid this “energy sink”. The basic structural model proposed in this paper is a simple portal frame driven by a non-ideal power source (NIPF). The vibrations absorption (in resonance, nonlinear and chaotic) is also analyzed by means of a nonlinear sub-structure known as a nonlinear energy sink (NES). An energy exchange process between NIPF and NES in the passage through resonance as well the suppression of chaos are investigated.
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