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A large machine sitting on the floor in a workshop emits noise with the following power 1W/125HZ, 1.5W/250HZ, 2W/500HZ, 2.5W/1000HZ, and 2W/2000HZ. The dimension of the workshop is 20mX15m with 6m ceiling. The walls, ceiling and floor have average absorption of 0.05, 0.6 and 0.02, respectively. If the machine is located at 5m from one end of the workshop, and an office wall needs to be built at 5m from the other end, calculate: The SWL in each frequency band, a) Room constants R for the workshop and office.

A large machine sitting on the floor in a workshop emits noise with the following power 1W/125HZ, 1.5W/250HZ, 2W/500HZ, 2.5W/1000HZ, and 2W/2000HZ. The dimension of the workshop is 20mX15m with 6m ceiling. The walls, ceiling and floor have average absorption of 0.05, 0.6 and 0.02, respectively. If the machine is located at 5m from one end of the workshop, and an office wall needs to be built at 5m from the other end, calculate: The SWL in each frequency band, a) Room constants R for the workshop and office.

Elements Of Electromagnetics
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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A large machine sitting on the floor in a workshop emits noise with the following power 1W/125HZ, 1.5W/250HZ, 2W/500HZ, 2.5W/1000Hz, and 2W/2000Hz. The dimension of the workshop is 20OmX15m with 6m ceiling. The walls, ceiling and floor have average absorption of 0.05, 0.6 and 0.02, respectively. If the machine is located at 5m from one end of the workshop, and an office wall needs to be built at 5m from the other end, calculate: The SWL in each frequency band, a) Room constants R for the workshop and office. b) The sound pressure level in front of the office wall location A in each frequency band, c) The loudness of the noise at location A in each frequency band and the total loudness, d) If the transmission loss of the office wall is 20DB, what is the maximum loudness inside the office, e) How many hours can a person stay inside the office without exceeding the daily noise dose (DND)? 25m 15m 5m 5m
Transcribed Image Text:A large machine sitting on the floor in a workshop emits noise with the following power 1W/125HZ, 1.5W/250HZ, 2W/500HZ, 2.5W/1000Hz, and 2W/2000Hz. The dimension of the workshop is 20OmX15m with 6m ceiling. The walls, ceiling and floor have average absorption of 0.05, 0.6 and 0.02, respectively. If the machine is located at 5m from one end of the workshop, and an office wall needs to be built at 5m from the other end, calculate: The SWL in each frequency band, a) Room constants R for the workshop and office. b) The sound pressure level in front of the office wall location A in each frequency band, c) The loudness of the noise at location A in each frequency band and the total loudness, d) If the transmission loss of the office wall is 20DB, what is the maximum loudness inside the office, e) How many hours can a person stay inside the office without exceeding the daily noise dose (DND)? 25m 15m 5m 5m
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