5) A piece of machinery is enclosed in a sound-dampening cabinet, but you are concerned that the noise level is still too high for nearby workers. You make a measurement of absolute pressure exerted by the sound wave 1 ft outside the (closed) cabinet and find that the sound coming from it is 4.8 Pa. a) What is the sound pressure level at the location where you took the measurement? (i.e., 1 ft from the cabinet). b) You have been asked to draw a circle around the machinery cabinet to indicate the boundary beyond which hearing protection is not required. How far from the machinery must you be to be below the OSHA PEL of 90 dB (provide radius in ft)? c) If a worker spends 3 hrs working near the cabinet, what would their total dose be? Assume: 1) an 8-hr shift, 2) the average distance from the cabinet during the exposed portion of the shift is 1 ft (the same distance as the measurement), and 3) that the other 5 hrs had 0 exposure to noise. d) Should hearing protection be required? If so, what is the range of NRR values that would be required using 'ideal' and OSHA recommended factors? If the maximum NRR available is 37 dB, will the worker's hearing be sufficiently protected, or will additional controls be necessary? Justify your answer w/ a calculated exposure SPL using both with and without the additional OSHA protection factor.
5) A piece of machinery is enclosed in a sound-dampening cabinet, but you are concerned that the noise level is still too high for nearby workers. You make a measurement of absolute pressure exerted by the sound wave 1 ft outside the (closed) cabinet and find that the sound coming from it is 4.8 Pa. a) What is the sound pressure level at the location where you took the measurement? (i.e., 1 ft from the cabinet). b) You have been asked to draw a circle around the machinery cabinet to indicate the boundary beyond which hearing protection is not required. How far from the machinery must you be to be below the OSHA PEL of 90 dB (provide radius in ft)? c) If a worker spends 3 hrs working near the cabinet, what would their total dose be? Assume: 1) an 8-hr shift, 2) the average distance from the cabinet during the exposed portion of the shift is 1 ft (the same distance as the measurement), and 3) that the other 5 hrs had 0 exposure to noise. d) Should hearing protection be required? If so, what is the range of NRR values that would be required using 'ideal' and OSHA recommended factors? If the maximum NRR available is 37 dB, will the worker's hearing be sufficiently protected, or will additional controls be necessary? Justify your answer w/ a calculated exposure SPL using both with and without the additional OSHA protection factor.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:5) A piece of machinery is enclosed in a sound-dampening cabinet, but you are concerned that the
noise level is still too high for nearby workers. You make a measurement of absolute pressure
exerted by the sound wave 1 ft outside the (closed) cabinet and find that the sound coming from it
is 4.8 Pa.
a) What is the sound pressure level at the location where you took the measurement?
(i.e., 1 ft from the cabinet).
b) You have been asked to draw a circle around the machinery cabinet to indicate the boundary
beyond which hearing protection is not required. How far from the machinery must you be to
be below the OSHA PEL of 90 dB (provide radius in ft)?
c) If a worker spends 3 hrs working near the cabinet, what would their total dose be?
Assume: 1) an 8-hr shift, 2) the average distance from the cabinet during the exposed portion of
the shift is 1 ft (the same distance as the measurement), and 3) that the other 5 hrs had 0
exposure to noise.
d) Should hearing protection be required? If so, what is the range of NRR values that would be
required using 'ideal' and OSHA recommended factors? If the maximum NRR available is 37 dB,
will the worker's hearing be sufficiently protected, or will additional controls be necessary?
Justify your answer w/ a calculated exposure SPL using both with and without the additional
OSHA protection factor.
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