- An
acoustic transmission line is the use of a long
duct,
which acts as an
acoustic waveguide and is used to
produce or
transmit sound in an undistorted...
- An
acoustic duct or
plane wave tube is a test
facility used in acoustics.
Anechoic chambers are
typically subject to a low
frequency limit,
governed by...
- aeronautics, a
ducted fan is a thrust-generating
mechanical fan or
propeller mounted within a
cylindrical duct or shroud.
Other terms include ducted propeller...
- use
acoustic liners to damp
engine noise.
Liners are
applied on the
internal walls of the
engine nacelle, both in the
intake and by-p****
ducts, and use...
-
Ducts are
conduits or p****ages used in heating, ventilation, and air
conditioning (HVAC) to
deliver and
remove air. The
needed airflows include, for example...
- in solids. A
duct for
sound propagation also
behaves like a
transmission line (e.g. air
conditioning duct, car muffler, etc.). The
duct contains some...
- A
sound attenuator, or
duct silencer,
sound trap, or muffler, is a
noise control acoustical treatment of
Heating Ventilating and Air-Conditioning (HVAC)...
-
sound baffles for absorption, or
using active anti-noise
sound generators.
Acoustic quieting and
noise control can be used to
limit unwanted noise. Soundproofing...
- the Z of a
particular duct filled with air can be specified).[citation needed] The
acoustic ohm is a unit of
measurement of
acoustic impedance. The SI unit...
-
traveling in a
surface duct. A 1980
report by
Naval Ocean Systems Center gives examples in a
study of a
great circle acoustic path
between Perth, Australia...
