Frecuencias de resonancia de un aluminio esférico
Enviado por andres_mi8 • 9 de Marzo de 2015 • 453 Palabras (2 Páginas) • 136 Visitas
Resonance frequencies of a spherical aluminum
shell subject to static internal pressure
Andrew A. Piacsek and Sami Abdul-Wahid
Department of Physics, Central Washington University, Ellensburg, Washington 98926
piacsek@cwu.edu, sipho.1989@gmail.com
Robert Taylor
Department of Industrial Engineering and Technology, Central Washington University,
Ellensburg, Washington 98926
terebigemuwan@gmail.com
Abstract: Measurements of the vibrational response of a spherical
aluminum shell subject to changes in the interior pressure clearly
demonstrate that resonance frequencies shift higher as the pressure is
increased. The frequency shift appears to be smaller for longitudinal
modes than for bending wave modes. The magnitude of frequency shift
is comparable to analytical predictions made for thin cylindrical shells.
Changes in the amplitudes of resonance peaks are also observed. A
possible application of this result is a method for noninvasively monitoring
pressure changes inside sealed containers, including intracranial
pressure in humans.
VC 2012 Acoustical Society of America
PACS numbers: 43.40.Ey, 43.25.Gf [JGM]
Date Received: February 16, 2012 Date Accepted: April 20, 2012
1. Introduction
Recent interest in developing noninvasive techniques for measuring intracranial pressure
(ICP) has led to investigations of the vibrational response of skulls subject to internal
pressure changes. A significant result of these limited studies, both experimental1
and computational,2 is that an increase in ICP produces an upward shift in certain
resonance frequencies of ovine and human skulls. Although the maximum ICP investigated
was less than 0.5 psi, this result is consistent with the predictions of early theoretical
studies of thin cylindrical shells subject to much larger pressures.3–10 In addition
to ICP monitoring, this phenomenon has the potential
...