xii List of symbols
SYMBOL QUANTITY UNIT
Kij vibration reduction index dB
L edge length m
Ln impact sound pressure level dB
Lp sound pressure level dB
Lw sound power level dB
LF lateral energy fraction 1
m m
ass kg
m mass per unit area kg/m^2
m power attenuation coefficient m-
M mobility (mechanical) m/(N⋅s)
p sound pressure Pa
p probability density function 1
P probability 1
P pressure Pa
P 0 atmospheric pressure Pa
Pr Prandtl number 1
q scattering cross section m-
Q source strength m^3 /s
Q Q factor 1
r airflow resistivity Pa⋅s/m^2
r 0 radius m
rH hall radius m
R(τ) correlation function^2
R room constant m^2
R sound reduction index dB
R ́ apparent sound reduction index dB
Rw weighted sound reduction index dB
Rs pressure reflection factor 1
s stiffness per unit area N/m^3
sf pore shape factor 1
S area m^2
T time period, measuring time s
T reverberation time s
T transmissibility 1
u velocity (of a surface) m/s
U circumference m
v sound particle velocity, surface velocity^3 m/s
V volume m^3
w sound energy density J/m^3
W power (acoustical, mechanical) watt
Za acoustic impedance Pa⋅s/m^3
Zc complex characteristic impedance Pa⋅s/m
Zf^ field impedance (normalized)^1
Zg surface impedance Pa⋅s/m
(^2) The unit will depend on the actual physical quantity.
(^3) In cases where u and v appear simultaneously, u is a surface velocity and v is the particle velocity in the wave.