EACS 2016 paper - Prestressing for local isolation of forced vibrations
journal contributionposted on 28.03.2017, 15:16 by Grzegorz Suwała, Lech Knap, Jan Holnicki-Szulc
EACS 2016 Paper No. 154
The problem of dynamic response stabilization is a crucial issue in many engineering applications or structures subjected to an external source of excitation or dynamic load. At present, owing predominantly to advances in measurement technology, microprocessor control and development of smart materials it is possible to solve many of these problems. Semi-active or active damping systems, which are used to improving structure response, requires additional dampers or absorbers.
Contrary, in the article we present approach of suppressing local vibration via introducing initial prestressing into the chosen element or elements of the structure. In that way it is possible to change properties of the structure and its modes of vibrations.
We present the results of numerical simulations of the mechanical structure subjected to external excitations. Our results show that by introducing prestresing it is possible to significantly influence on eigenfrequances and eigenmodes. Also effectiveness of vibration amplitudes reduction can be significantly larger, at least one order of magnitude larger.