Hw5 - Octave band centre(Hz 125 250 500 1000 2000 4000 Sound pressure 84 83 82 80 1 What Noise Criterion(NC would be appropriate for the conference

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1Department of Architecture University of Florida Environmental Technology II Gary Siebein ARC 4620 Dan Butko, Young min Kwon, Koyel Sikdar, Pattra Smitthakorn Fall 2004 Homework Assignment 5: Transmission Loss Due in lab, Tuesday October 19, 2004. Transmission Loss (abbreviated TL and measured in decibels) of a barrier is the ratio of sound level in a receiving room to the sound level in the source room. It is a measure of how much sound energy is reduced through materials. It shows the sound-isolating quality of the barrier. Generally more massive materials tend to have higher TL. For this homework assignment you will need to estimate the sound transmission loss between two rooms in a commercial building. Assume that the loudest noise produced in the units will be from a mechanical equipment room. Estimates of the spectrum of the average sound pressure level (dB) in the source room are as follows:

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Unformatted text preview: Octave band centre (Hz) 125 250 500 1000 2000 4000 Sound pressure level 86 85 84 83 82 80 1. What Noise Criterion (NC) would be appropriate for the conference room (receiving room)? 2. What is the Noise Reduction (NR) in the conference room (receiving room)? 3. Determine the required TL at each octave band frequency center. Assume the following for calculating the Transmission Loss (TL): The wall between the units is 12ft tall and 16ft long and the receiving room is finished with ½" gypsum board on wood studs (16"o c) for the walls and ceiling. The floor is heavy carpet on a foam pad. The source room has walls that are 12ft high x 16ft long (256 square feet in plan). Figure 1: Plan showing adjacent rooms 4. From the figure below, name three categories of noise sources/types. 5. Provide a noise control solution for each of these acoustical problems. Figure 2: Sources of noise...
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This note was uploaded on 08/27/2011 for the course ARC 4620 taught by Professor Staff during the Fall '08 term at University of Florida.

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Hw5 - Octave band centre(Hz 125 250 500 1000 2000 4000 Sound pressure 84 83 82 80 1 What Noise Criterion(NC would be appropriate for the conference

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