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1. Determine the sum of the following sound levels (all in decibels): 68, 82, 76, 68, 74 and 81

1. Determine the sum of the following sound levels (all in decibels): 68, 82, 76, 68, 74 and 81

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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1. Determine the sum of the following sound levels (all in decibels): 68, 82, 76, 68, 74 and 81 2. A law enforcement officer has taken the following readings with her sound level meter. It is the noise source a predominantly low or middle-frequency emitter? Readings 80 dBA, 84 dBB and 90 dBC 3. A sound power level reading of 127 dB was taken near a construction site where chippers were being used. When all but one of the chippers stopped working, the sound power level reading was 120 dB. Estimate the number of chippers in operation when the reading of 127 was obtained. You may assume that the sources may be treated as ideal point sources located in at the same point. 4. The following noise record was obtained in the front yard of a home. Is this home in a relatively quiet or a relatively noisy neighborhood? Determine the equivalent continuous equal energy level. Time (Hours) 0000-0600 0600-0800 0800-0900 0900 - 1500 1500-1700 1700 - 1800 1800 - 0000 Sound Level (dBA) 42 45 50 47 50 47 45 5. Compute the average sound pressure level of the following readings by simple arithmetic averaging and by logarithmic averaging (all readings are in dB): 42, 50, 65, 71 and 47. Does arithmetic averaging underestimate or overestimate the sound pressure level?
Transcribed Image Text:1. Determine the sum of the following sound levels (all in decibels): 68, 82, 76, 68, 74 and 81 2. A law enforcement officer has taken the following readings with her sound level meter. It is the noise source a predominantly low or middle-frequency emitter? Readings 80 dBA, 84 dBB and 90 dBC 3. A sound power level reading of 127 dB was taken near a construction site where chippers were being used. When all but one of the chippers stopped working, the sound power level reading was 120 dB. Estimate the number of chippers in operation when the reading of 127 was obtained. You may assume that the sources may be treated as ideal point sources located in at the same point. 4. The following noise record was obtained in the front yard of a home. Is this home in a relatively quiet or a relatively noisy neighborhood? Determine the equivalent continuous equal energy level. Time (Hours) 0000-0600 0600-0800 0800-0900 0900 - 1500 1500-1700 1700 - 1800 1800 - 0000 Sound Level (dBA) 42 45 50 47 50 47 45 5. Compute the average sound pressure level of the following readings by simple arithmetic averaging and by logarithmic averaging (all readings are in dB): 42, 50, 65, 71 and 47. Does arithmetic averaging underestimate or overestimate the sound pressure level?
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