2) A machine radiating an A-weighted sound power level of 84DB is installed in the centre of the floor of a room of dimensions 10m x 6m x 3m with an average boundary Sabine absorption coefficient of 0.15. Calculate the reverberant sound pressure level assuming the directivity factor 0 and pc = 414. Appendix +5 A C. -5 B and C -10 -15 -20 Standard Filter -25 Contours -30 A -45 -50 20 50 100 200 500 1000 2000 5000 10k 20k Frequency (Hz) Graph SPL Weighting Frequency 31.5 63 125 250 500 1kHz 2kHz | 4kHz 8kHz A -39.4 -26.2 -16.1 -8.6 -3.2 1,2 1 -1.1 weighted Correction -17 -9 -4 -1 -1 -3 Weighted correction C -3 -0.8 -0.2 -0.2 -0.8 -3 Weighted Correction Table :Sound Pressure Level Weighting Correction factor Relative response (dB)
2) A machine radiating an A-weighted sound power level of 84DB is installed in the centre of the floor of a room of dimensions 10m x 6m x 3m with an average boundary Sabine absorption coefficient of 0.15. Calculate the reverberant sound pressure level assuming the directivity factor 0 and pc = 414. Appendix +5 A C. -5 B and C -10 -15 -20 Standard Filter -25 Contours -30 A -45 -50 20 50 100 200 500 1000 2000 5000 10k 20k Frequency (Hz) Graph SPL Weighting Frequency 31.5 63 125 250 500 1kHz 2kHz | 4kHz 8kHz A -39.4 -26.2 -16.1 -8.6 -3.2 1,2 1 -1.1 weighted Correction -17 -9 -4 -1 -1 -3 Weighted correction C -3 -0.8 -0.2 -0.2 -0.8 -3 Weighted Correction Table :Sound Pressure Level Weighting Correction factor Relative response (dB)
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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Question
Transcribed Image Text:2) A machine radiating an A-weighted sound power level of 84dB is installed in the
centre of the floor of a room of dimensions 10m x 6m x 3m with an average boundary
Sabine absorption coefficient of 0.15. Calculate the reverberant sound pressure level
assuming the directivity factor = 0 and pc 414.
Appendix
-5
B and C
-10
-15
B
-20
Standard Filter
-25
Contours
-30
-35
A
-40
-45
-50
20
50 100 200
500 1000 2000 5000 10k 20k
Frequency (Hz)
Graph SPL Weighting
Frequency
31.5
63
125
250
500
1kHz
2kHz 4kHz 8kHz
A
-39.4
-26.2
-16.1
-8.6
-3.2
1,2
-1.1
weighted
Correction
-17
-9
-4
-1
-1
-3
Weighted
correction
-3
-0,8
-0.2
-0.2
-0.8
-3
Weighted
Correction
Table :Sound Pressure Level Weighting Correction factor
Relative response (dB)
三。
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