✦ LIBER ✦

CONTROL OF MULTI-SPAN BEAM VIBRATION BY A RANDOM WAVE REFLECTOR

✍ Scribed by M.B. XU; L. HUANG

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 351 KB
Volume: 250
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.2001.3939

No coin nor oath required. For personal study only.

✦ Synopsis

In this paper, a new wave re#ector called random wave re#ector (RWR) is introduced for the control of transverse vibration and wave propagation in an in"nite, multi-span, simple-support beam. In order to illustrate the theory, RWR is "rst tested in a simple con"guration of controlling plane wave propagation through layers of gas media. Results demonstrate that RWR has great advantages over other types of noise abatement methods. RWR is then applied to control the vibration of the multi-span beam in which the support locations are given in a random manner. Two types of external excitations, an incident vibration wave and an external point force, are considered separately. Transmission loss, localization factor, mode shape and input power #ow are used to investigate the e!ectiveness of RWR. The results show that no vibrational power #ow can be tapped into or propagate through a random system at any frequency. The passbands, which always exist in traditional systems, are eliminated in a random system for which much better performance is obtained over a broad frequency range.

2002 Elsevier Science Ltd.

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