NOISE AND VIBRATION CONTROL Episode 11 pptx
NOISE AND VIBRATION CONTROL Episode 11 pptx
... a
detailed analyses of the noise and noise control of
ducted ventilation systems.
b. Noise reduction from fan housing. The fan
housing and its nearby connected ductwork radiate
fan noise into the fan ... octave bands containing the impeller
C-12. Fans.
blade passage frequency and its first harmonic.
These would usually fall in the 1,000 and 2,000 Hz
octave bands. The data of...
NOISE AND VIBRATION CONTROL Episode 4 pptx
... paths (paths 2 and 3)
of noise and vibration caused by airborne excita-
tion of walls and columns in the mechanical
equipment room. These paths make it impossible
to achieve the low noise levels ... area
“A” (which is the product of the two lengths “a”
and “b”). At twice the distance, 2d, the lengths a
and b are expanded to 2a and 2b, and the result-
ing area over which th...
NOISE AND VIBRATION CONTROL Episode 6 pptx
... the architect and engineer
to problems of noise and vibration. This is an
important first step to noise control. Without
awareness, the noise problem is ignored in the
design, and later problems ... the various sources,
fan noise will control the noise level in the low
frequency range, air terminal units will control in
the mid-frequency range, and air outlets will
co...
NOISE AND VIBRATION CONTROL Episode 12 pps
... 32-1090
BIBLIOGRAPHY
Harris, Cyril M., Noise Control in Buildings, McGraw-Hill, New York, NY 1994
Jones, Robert S., Noise & Vibration Control in Buildings, McGraw-Hill, New York, NY 1984
Fry, Alan, Noise Control in ... Engineering Noise Control, Unwin Hyman, Boston, MA 1988
Harris, Cyril M., Shock & Vibration Handbook, 3rd Edition, McGraw-Hill, New York, NY 1988
Ber...
NOISE AND VIBRATION CONTROL Episode 1 docx
... 10. NOISE AND VIBRATION MEASUREMENTS
Objective 10-1 10-1
Sound and Vibration Instrumentation 10-2 10-1
Measurement of Noise and Vibration in Buildings 10-3 10-2
Measurement of Noise and Vibration ... 9-4
B-1. Bandwidth and Geometric Mean Frequency of Standard Octave and 1/3 Octave Bands B-6
UFC 3-450-01
15 May 2003
1
UNIFIED FACILITIES CRITERIA (UFC)
NOI...
NOISE AND VIBRATION CONTROL Episode 2 docx
... -7
-7
-7
-7 -7 -7
320 -6
-7
-8
-8
-9 -9 -9 -9 -9
500
-7 -9
-10
-11 -11
-11
-11
-11
-11
700
-8
-10
-12
-12
-12
-13
-13 -13
-13
1000
-8
-11 -13 -13 -14 -14
-15
-15
-15
2000
-9
-12
-15
-16
-17 -17
-17 ... level L
pD1Rl
; D
2
and R
2
are
the distance and Room Constant values for the
new set of conditions for which the new sound
pressure level L
pD2R2
is wanted; and REL SPL
DIRl...
NOISE AND VIBRATION CONTROL Episode 3 doc
... Airborne noise and structureborne vi-
bration radiated as noise may intrude into these
occupied floors if adequate controls are not in-
cluded in the building design. The approximate
octave band “TL” ... side of 2x4-in.
wood studs on 16-in. centers.
Fill and tape Joints and edges; finish as
desired. For equal width metal studs,
add 3 dB in all bands and to STC.
Type 3 One layer 5/...
NOISE AND VIBRATION CONTROL Episode 5 ppt
... barrier.
5-6. Reception of Outdoor Noise Indoors.
An intruding noise coming from an outdoor noise
source or by an outdoor noise path may be heard
by neighbors who are indoors.
a. Noise reduction (NR) of ... 108
143 189
7000 77 78 81 83 88 96 111
149 199
7500 78 79 82 85 89 98 115 155 208
8000 76 80 82 86 90 100 118 161
218
ket of snow are intermittent, temporary, and of
solid...
NOISE AND VIBRATION CONTROL Episode 7 potx
... Example.
Octave Band Center Frequencies
63
125 250 500 1k 2k 4k
Room Factor
(sq/ft.) 450 600 450 500 600 600
600
“Rel SPL” -9 -11 -9 -10 -11 -11
-11
Total Lw (d.
above) 60
58 44 35 40 40
23
Lp-Octave band
Sound ... isolators and their range of static de-
flections and natural frequencies as applied to two
equipment categories (rotary and reciprocating)
and two equipment locations...
NOISE AND VIBRATION CONTROL Episode 8 pdf
... re-
quired to achieve near inaudibility. The noise and
vibration control methods given here are designed
to be simple to follow and to put into use. If these
methods and recommendations are carried out,
with ... tanks, large
ducts, and some large pipe stands may not them-
selves be noise sources, yet their pipes or their
connections to vibrating sources transmit small
amounts...