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{
"metadata": {
"name": "",
"signature": "sha256:cb0c026235eca0bc18a695dcb9668ea4e2691af702577b5109cf13ded8d1630d"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter11-Architectural Acoustics"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex1-pg293"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 11.1\n",
"##calculation of total absorption and average absorption coefficient\n",
"\n",
"##given values\n",
"\n",
"V=20*15*5.;##volume of hall in m**3\n",
"t=3.5;##reverberation time of empty hall in sec\n",
"\n",
"\n",
"##calculation\n",
"a1=.161*V/t;##total absorption of empty hall\n",
"k=a1/(2.*(20*15+15*5+20*5.));\n",
"print'%s %.2f %s'%('the average absorption coefficient is',k,'');"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"the average absorption coefficient is 0.07 \n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2-pg293"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 11.2\n",
"##calculation of average absorption coefficient\n",
"\n",
"##given values\n",
"\n",
"V=10*8.*6.;##volume of hall in m**3\n",
"t=1.5;##reverberation time of empty hall in sec\n",
"A=20.;##area of curtain cloth in m**2\n",
"t1=1.;##new reverberation time in sec\n",
"\n",
"##calculation\n",
"a1=.161*V/t;##total absorption of empty hall\n",
"a2=.161*V/t1;##total absorption after a curtain cloth is suspended\n",
"\n",
"k=(a2-a1)/(2.*20.);\n",
"print'%s %.2f %s'%('the average absorption coefficient is',k,'');\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"the average absorption coefficient is 0.64 \n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex3-pg293"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 11.3\n",
"##calculation of average absorption coefficient and area\n",
"\n",
"##given values\n",
"\n",
"V=20*15*10.;##volume of hall in m**3\n",
"t=3.5;##reverberation time of empty hall in sec\n",
"t1=2.5;##reduced reverberation time \n",
"k2=.5;##absorption coefficient of curtain cloth\n",
"##calculation\n",
"a1=.161*V/t;##total absorption of empty hall\n",
"k1=a1/(2*(20*15+15*10+20*10));\n",
"print'%s %.2f %s'%('the average absorption coefficient is',k1,'');\n",
"a2=.161*V/t1;##total absorption when wall is covered with curtain\n",
"a=t1*(a2-a1)/(t1*k2);\n",
"print'%s %.2f %s'%('area of wall to be covered with curtain(in m^2)is:',a,'')"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"the average absorption coefficient is 0.11 \n",
"area of wall to be covered with curtain(in m^2)is: 110.40 \n"
]
}
],
"prompt_number": 1
}
],
"metadata": {}
}
]
}
|
