6. The room pictured has the following absorption coefficients at 500 Hz: Floor: Carpet, a = 0.14 Ceiling: Acoustic Ceiling Tile, a = 0.70 Walls: Gypsum Wallboard, a = 0.10 a. Calculate the total absorption in this room. b. Calculate the reverberation time. c. Calculate the mean free path. 6m 8 m 2 m

6. The room pictured has the following absorption coefficients at 500 Hz: Floor: Carpet, a = 0.14 Ceiling: Acoustic Ceiling Tile, a = 0.70 Walls: Gypsum Wallboard, a = 0.10 a. Calculate the total absorption in this room. b. Calculate the reverberation time. c. Calculate the mean free path. 6m 8 m 2 m

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A room 3 m X 6 m X 10 m has walls of average absorptivity 0.05. The floor is covered with a rug (a = 0.6), and the ceiling is wood (a = 0.1). ( a ) Calculate the average absorptivity. (b) Calculate the reverberation time from (12.3.4). (c) Calculate the reverberation time from (12.4.2) and compare with the answer to (b).
Compute the absorption of a cubic room 7m x 7m x 7m made out of unpainted concrete block at 500hz? A room with a volume of 1000 cubic meter has a reverb time of 1.8 seconds. Compute for A? Determine the reverberation time of a room whose dimensions are: 13m X 20m X 8m. The floor is covered with carpet (8m X 13m) with an absorption coefficient of 0.4, the wall is made of marble with absorption coefficient of 0.03, the ceiling is covered with plater on laths with an absorption coefficient of 0.025, the floor is tiled with an absorption coefficient of 0.015, the door (1.8m X 0.7m) has an absorption coefficient of 0.1 and the windows on both side has absorption coefficient of 0.075 with dimensions 2m X 10m. Use SABINE equation.
The room pictured has the following absorption coefficients at 500 Hz: Floor: Carpet, α = 0.14 Ceiling: Acoustic Ceiling Tile, α = 0.70 Walls: Gypsum Wallboard, α = 0.10 Reference image attached below. a. Calculate the total absorption in this room b. Calculate the room constant. c. Calculate the critical distance. Assume Q=4. d. A source generates a sound power level, LW, of 102 dB. The directivity, Q, is 4. What sound pressure level, Lp, would be measured at a distance of 6 m in the room above?
b) A workshop of six similar internal surfaces possesses a reverberation time of 3 sec. The dimension of the workshop is 18 m x 10 m x 6 m. A machine is operated inside the workshop that has a sound power level of 80 dB and a directivity factor, Q = 2. To reduce the noise level within the workshop, the following noise treatment are applied on the workshop internal surface a) Ceiling covered with material of absorption coefficient = 0.7 b) Both long walls covered with material of absorption coefficient = 0.8 Determine the following: ii) What will be the sound pressure level at 2 m from the machine operating in the workshop
(3) A space of 16 m long x 8 m wide x 5 m high, has the following materials: Walls: gypsum board (NRC = 0.05) Ceiling: Fibrous board (NRC = 0.15) Floor: Wooden board (NRC = 0.1) Find the reverberation time, and evaluate the room according to the result. Ans. 2.3 s
Solve for what is being required. Room dimensions are: LxWxH = 8.50 m, 5.0 m, 3m. Originally, the room had linoleum flooring with an absorption coefficient of 0.03. Two opposite walls were cladded with unglazed bricks with an absorption coefficient of 0.02, the one having the entrance gypsum door (2.1 m X 0.80 m) with 0.05 abs.co.; the other two were just bare concrete with sliding glass window openings of 1.80m x 1.20 m each; the bare concrete with an abs.co. Of 0.31 and the window glass with 0.18, the ceiling, too , had bare concrete as its finish at 500 Hz. The client would like to renovate the space into an acoustical studio room and would like to change the ceiling and the flooring. The ceiling will have a vinyl faced fiberglass panel with an abs.co. of 0.71, and the floor will have mineral fiber tiles with an abs.co. Of 0.66, all at 500 Hz.
Answer ONLY items 5-8. Room dimensions are: LxWxH = 8.50 m, 5.0 m, 3m. Originally, the room had linoleum flooring with an absorption coefficient of 0.03. Two opposite walls were cladded with unglazed bricks with an absorption coefficient of 0.02, the one having the entrance gypsum door (2.1 m X 0.80 m) with 0.05 abs.co.; the other two were just bare concrete with sliding glass window openings of 1.80m x 1.20 m each; the bare concrete with an abs.co. Of 0.31 and the window glass with 0.18, the ceiling, too , had bare concrete as its finish at 500 Hz. The client would like to renovate the space into an acoustical studio room and would like to change the ceiling and the flooring. The ceiling will have a vinyl faced fiberglass panel with an abs.co. of 0.71, and the floor will have mineral fiber tiles with an abs.co. Of 0.66, all at 500 Hz.
1 Let the reverberation time be 1.5 s for an empty hall and 1.3 s when a curtain cloth of 20 m2 is suspended at the centre of the hall. If the dimensions of the hall are 10mx8mx6m, calculate the coefficient of absorption of the curtain cloth. What area of the empty hall wall should be covered by the similar curtain cloth so as to reduce the reverberation time to 1.1 s?
A flow of 125 gpm of chilled water at 45°F is to be transported from a chiller to a set of cooling colls located 120 ft away. Determine the chilled water velocity in ft/s that satisfies the requisite criteria. Assume turbulent flow and the sum of the loss coefficients effectively doubles the length of the piping. I A) 6.32 5.52 3.92 4.72
For a monosized media filter with a particle size of 2.5 mm in diameter, a bed depth of 2 m and porosity of 20%. Water tempeature- 15°C. The treted water flow is 15 gpm/ft?. Calculate the water head loss: O A. 0.5 m O B. 1.5 m O C.5.7 m O D. 15 m
Q1/ The west wall in a building in Baghdad (32°N) has a window of the dimensions (1.0 m x 2.0 m). The glass is of heat absorbing type (U= 4.6 W/m².ºC) and thickness of 6 mm.. Outdoor design condition is 34°C DBT, with daily range of 11°C, and indoor design temperature is 24°C. Calculate the cooling load from the window at 4:00 P.M. in the month of August.
Compute for the surface tension in a tube with 0.375-m radius for water-glass interface with capillary rise of 9mm.