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COURSE OUTLINE
EET
454: Environmental Noise Control
Credit and Contact Hrs.
(Lecture/Laboratory): 3 credits and 3 contact hours per week
Course Description: Study
of noise, noise measurement, physiological effects of noise, federal regulations, and
design criteria for noise reduction.
Prerequisites/Co-requisites:
Junior status / None
Textbook: Hemond,
Conrad J. Jr. Engineering Acoustics and Noise Control. 1st Edition,
Prentice-Hall, Inc. 1983.
References:
Rettinger, Michael. Handbook of
Architecture Acoustics and Noise Control. TAB Professional and Reference Books. 1st ed.
1988.
Everfest, F. Alton. The Master
Handbook of Acoustics, TAB Books, 2nd ed., 1989.
Course Coordinator: Joseph
M. Farren, Professor.
Goals/Objectives:
To develop the students'
expertise in the broad area of environmental noise control including the analysis of
sources of noise, design for noise reduction, and development of procedures for noise
control.
Course topics and
lecture hours devoted to each topic:
Terminology - Introduction,
frequency, octave bands, period, wave motion, speed of sound, particle motion, intensity,
energy density, power decibel notation, combining decibels. (5 hrs.)
Hearing - Need to study,
physical description of the ear, range of audibility, threshold shift, masking, hearing
loss with age, federal standards, health effects of noise. (2.5 hrs.)
Instrumentation - Introduction,
microphones-general, dynamic microphones, ceramic microphones, condenser microphones,
electret microphones (condenser), sound level meters, filters - octave band and one-third
octave band, auxiliary instrumentation. (2.5 hrs.)
Reflection, reverberation, and
refraction. (2.5 hrs.)
Diffraction and interference,
barriers, openings. (2.5 hrs.)
Absorption - Definition of
absorption, flow resistance, porosity experiment, impedance tube, the sabin, optimum
reverberation time, reverberation time versus frequency, absorption coefficients of common
materials, noise reduction coefficient (NRC). (2.5 hrs.)
Transmission Loss - Energy
loss, transmission across a plane boundary, control regions, mass law, procedure using
co-incident and plateau effects, sound transmission class, field testing-noise reduction,
compound partitions, porous materials. (2.5 hrs.)
Loudness and perceived noise -
Loudness, equal loudness curves, perceived noise (PNdB or PNL), effective perceived noise
(EPNdB or EPNL), noise exposure forecast (NEF) the A scale, conversion to a weighted
scale, equivalent level (Leq), day-night average level (Ldn), community noise equivalent
level (FNEL), composite noise rating (for aircraft noise) (CNR), noise and number index
(NNI), summary, additional notation. (2.5 hrs.)
Systematic Approach to Noise
Control - The economic factor, the source, noise control, engineering parameters, data
acquisition, noise-flow diagrams. (2 hrs.)
Community Noise - Introduction,
historical perspective, performance zoning - noise predictable variables, neighborhood
classification, examples of community response, procedures for community response,
procedure for community noise surveys, noise buffer zoning, legal enforcement, enforcement
by ordinance or zoning. (2.5 hrs.)
Air Distribution System Noise -
Introduction, a typical air distribution system, relative energy levels, fan room noise,
fan noise, other fan room noise sources, duct system noise sources, acoustic treatment for
ducts, packaged silencers. (2.5 hrs.)
Architectural Acoustics -
Introduction, shape factor, reflection diffraction, reverberation and absorption, masking,
modeling. (2.5 hrs.)
Exams (in class - 4 hrs.)
Exams. (outside class - 5
hrs.)
Computer usage: None.
Laboratory projects:
Outside class sound level meter
project and report. (2 hrs.)
Outside class factory layout
project and report. (10 hrs.)
Oral and written
communications: Reports assigned including oral discussions.
Calculus Usage: None.
Library Usage: Sound
and Vibration magazines supplied. |
