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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# 14: Acoustics of Buildings and Acoustic Quieting"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example number 1, Page number 14.18"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"reverbration time is 3.9 s\n",
"reverbration time when audience fill the hall is 1.95 s\n",
"reverbration time is reduced to one-half\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"V=2265; #volume(m**3)\n",
"a=92.9; #absorption(m**2)\n",
"\n",
"#Calculation\n",
"T=0.16*V/a; #reverbration time(s)\n",
"T2=T/2; #reverbration time when audience fill the hall(s)\n",
"\n",
"#Result\n",
"print \"reverbration time is\",round(T,1),\"s\"\n",
"print \"reverbration time when audience fill the hall is\",round(T2,2),\"s\"\n",
"print \"reverbration time is reduced to one-half\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example number 2, Page number 14.18"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"reverbration time is 0.8 second\n",
"reverbration time when hall is empty is 1.6 second\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"V=12*30*6; #volume(m**3)\n",
"A1=450; #area of plastered wall(m**2)\n",
"a1=0.03; #coefficient of absorption(m**2)\n",
"A2=360; #area of wooden floor(m**2)\n",
"a2=0.06; #coefficient of absorption(m**2)\n",
"A3=24; #area of glass(m**2)\n",
"a3=0.25; #coefficient of absorption(m**2)\n",
"A4=600; #area of seats(m**2)\n",
"a4=0.3; #coefficient of absorption(m**2)\n",
"A5=500; #area of hall with audience(m**2)\n",
"a5=0.43; #coefficient of absorption(m**2)\n",
"\n",
"#Calculation\n",
"A=(A1*a1)+(A2*a2)+(A3*a3)+(A4*a4)+(A5*a5); #total absorption(m**2)\n",
"Ae=A-(A5*a5); #absorption when hall is empty(m**2) \n",
"T=0.16*V/A; #reverbration time(second)\n",
"Te=0.16*V/Ae; #reverbration time when hall is empty(second)\n",
"\n",
"#Result\n",
"print \"reverbration time is\",round(T,1),\"second\"\n",
"print \"reverbration time when hall is empty is\",round(Te,1),\"second\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example number 3, Page number 14.19"
]
},
{
"cell_type": "code",
"execution_count": 11,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"total absorption is 1000 m**2 or OWU\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"V=7500; #volume(m**3)\n",
"T=1.2; #reverbration time(second)\n",
"\n",
"#Calculation\n",
"A=0.16*V/T; #total absorption(OWU)\n",
"\n",
"#Result\n",
"print \"total absorption is\",int(A),\"m**2 or OWU\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example number 4, Page number 14.19"
]
},
{
"cell_type": "code",
"execution_count": 29,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"change in reverbration time is 0.727 second\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"V=12*10**4; #volume(m**3)\n",
"a=13200; #absorption(m**2)\n",
"\n",
"#Calculation\n",
"T1=0.16*V/a; #reverbration time(s)\n",
"T2=T1/2; #reverbration time when audience fill the hall(s)\n",
"T=T1-T2; #change in reverbration time(second)\n",
"\n",
"#Result\n",
"print \"change in reverbration time is\",round(T,3),\"second\""
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.11"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
