ESDU 00002:2011
$89.05
Sound Power Radiation from Isotropic Plates
| Published By | Publication Date | Number of Pages |
| ESDU | 2011-05 | 60 |
ESDU 00002 describes how vibrating plates radiate sound power by
setting the surrounding fluid in motion, and it allows the
estimation of the sound power radiated from an isotropic plate to a
fluid with properties similar to those of air (low fluid loading).
It covers two types of plate configurations: a single plate and a
double plate (corresponding to a double wall construction). The
ability of the single plate to radiate sound power is described by
its radiation efficiency which depends on the properties of the
plate and of the fluid, the boundary conditions of the plate and
the nearby surrounding structure referred to as a baffle.
Analytical expressions are given that allow the calculation of the
radiation efficiency. A number of graphs enable these values to be
corrected for the influence of the boundary conditions and the
influence of the baffle. For real plate constructions the boundary
conditions will be somewhere between simply-supported and clamped.
An auxiliary program, ESDUpac A0002, allows the boundary conditions
to be determined approximately from one or several measured
resonance frequencies. For a double plate, the fluid in the gap
between the plates will influence the sound power radiation and a
theory different from that used for the single plate must therefore
be employed. This theory is incorporated in the program, ESDUpac
B0002, which allows the estimation of the radiated sound power from
a double plate construction. Finally, analytical expressions are
given from which SEA (Statistical Energy Analysis) coupling loss
factors between fluids and plate structures may be calculated. The
programs are provided with this Item. Full details of input and
output formats are given and illustrated by worked examples.
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