EC2053 ENGINEERING ACOUSTICS

EC2053 ENGINEERING ACOUSTICS L T P C
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UNIT I ACOUSTICS WAVES 9
Acoustics waves - Linear wave equation – sound in fluids – Harmonic plane waves –
Energy density – Acoustics intensity – Specific acoustic impedance – spherical waves –
Describer scales.
Reflection and Transmission:
oblique incidence – method of images.
Transmission from one fluid to another normal and
UNIT II RADIATION AND RECEPTION OF ACOUSTIC WAVES 9
Radiation from a pulsating sphere – Acoustic reciprocity – continuous line source -
radiation impedance - Fundamental properties of transducers.
Absorption and attenuation of sound
Absorption from viscosity – complex sound speed and absorption – classical absorption
coefficient
UNIT III PIPES RESONATORS AND FILTERS 9
Resonance in pipes - standing wave pattern absorption of sound in pipes – long
wavelength limit – Helmoltz resonator - acoustic impedance - reflection and transmission
of waves in pipe - acoustic filters – low pass, high pass and band pass.
Noise, Signal detection, Hearing and speech
Noise, spectrum level and band level – combing band levels and tones – detecting
signals in noise – detection threshold – the ear – fundamental properties of hearing –
loudness level and loudness – pitch and frequency – voice.
UNIT IV ARCHITECTURAL ACOUSTICS: 9
Sound in endosure – A simple model for the growth of sound in a room – reverberation
time - Sabine, sound absorption materials – measurement of the acoustic output of
sound sources in live rooms – acoustics factor in architectural design.
Environmental Acoustics:
Weighted sound levels speech interference – highway noise – noise induced hearing
loss – noise and architectural design specification and measurement of some isolation
design of portions.
UNIT V TRANSDUCTION 9
Transducer as an electives network – canonical equation for the two simple transducers
transmitters – moving coil loud speaker – loudspeaker cabinets – horn loud speaker,
receivers – condenser – microphone – moving coil electrodynamics microphone
piezoelectric microphone – calibration of receivers.
TOTAL= 45 PERIODS
TEXT BOOK:
1. Lawrence E.Kinsler, Austin, R.Frey, Alan B.Coppens, James V.Sanders,
Fundamentals of Acoustics, 4th edition, Wiley, 2000.
REFERENCE:
1. L.Beranek , “Acoustics” - Tata McGraw-Hill
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