List of symbols

SYMBOL QUANTITY UNIT

a radius, length of edge m
a acceleration m/s^2
ai equivalent absorption length m
A absorption area m^2
b slit width m
B permeability m^2
B bending stiffness per unit length N⋅m
c damping coefficient (mechanical) N⋅s/m
c sound speed (phase speed) m/s
c 0 sound speed in air m/s
cB bending wave speed m/s
cL^ longitudinal wave speed m/s
cp specific heat capacity at constant pressure J/(kg⋅K)
cS shear wave speed m/s
cv specific heat capacity at constant volume J/(kg⋅K)
C adaptation term dB
Cte early-to-late index 1
d length m
D dipole moment m^4 /s
D level difference dB
Dv,ij velocity level difference dB
D 50 definition 1
Dθ directivity factor 1
E modulus of elasticity N/m^2
E energy J
f frequency Hz
fc critical frequency Hz

fR ring frequency Hz
fS Schroeder limiting frequency Hz
F force N
G shear modulus N/m^2
G power spectral density function^1
h impulse response “
H transfer function 1
I sound intensity watt/m^2
I area moment of inertia per unit length m^3
j imaginary unit
k, kmec stiffness (mechanical) N/m
k wave number m

kB wave number of bending wave m-^
ks tortuosity 1
K bulk modulus Pa

(^1) The unit will depend on the actual physical quantity.