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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 5: Acoustics"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5.1: find_absorption_coefficient.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//chapter5,Example5_1,pg 97\n",
"\n",
"T1=1.5\n",
"\n",
"T2=1\n",
"\n",
"A=20\n",
"\n",
"V=10*8*6\n",
"\n",
"a=((0.161*V)/(2*A))*((1/T2)-(1/T1))\n",
"\n",
"printf('absorption coefficient\n')\n",
"\n",
"printf('a=%.3f Sabines',a)"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5.2: find_area_of_wall_covered_by_curtain.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//chapter5,Example5_2,pg 97\n",
"\n",
"V=3000\n",
"\n",
"T1=3.5//reverberation time\n",
"\n",
"A=(0.161*V)/T1\n",
"\n",
"l=20\n",
"\n",
"b=15\n",
"\n",
"h=10\n",
"\n",
"S=2*((l*b)+(b*h)+(h*l))\n",
"\n",
"sum_a=A/S\n",
"\n",
"am=0.5\n",
"\n",
"a=0.106\n",
"\n",
"T2=2.5//reverberation time after cloth use\n",
"\n",
"S1=(((0.161*V)/(am-a))*((1/T2)-(1/T1)))\n",
"\n",
"printf('area of wall covered by curtain cloth\n')\n",
"\n",
"printf('S1=%.3f sq.m',S1)"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5.3: find_reverberation_time.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//chapter5,Example5_3,pg 98\n",
"\n",
"V=1450\n",
"\n",
"A1=112*0.03//absorption due to plastered wall\n",
"\n",
"A2=130*0.06//absorption due to wooden floor\n",
"\n",
"A3=170*0.04//absorption due to plastd. celing\n",
"\n",
"A4=20*0.06//absorption due to wooden door\n",
"\n",
"A5=100*1//absorption due to cushioned chairs\n",
"\n",
"sum_as=A1+A2+A3+A4+A5\n",
"\n",
"T1=(0.161*V)/sum_as//reverberation time case-1\n",
"\n",
"T2=(0.161*V)/(sum_as+(60*4.7))//persons=60,A=4.7 case-2\n",
"\n",
"T3=(0.161*V)/(sum_as+(100*4.7))//seat cushioned=100 rev. case-3\n",
"\n",
"printf('rev. time for case-1\n')\n",
"\n",
"printf('T1=%.3f sec',T1)\n",
"\n",
"printf('\nrev. time for case-2\n')\n",
"\n",
"printf('T2=%.3f sec',T2)\n",
"\n",
"printf('\nrev. time for case-3\n')\n",
"\n",
"printf('T3=%.3f sec',T3)"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Scilab",
"language": "scilab",
"name": "scilab"
},
"language_info": {
"file_extension": ".sce",
"help_links": [
{
"text": "MetaKernel Magics",
"url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
}
],
"mimetype": "text/x-octave",
"name": "scilab",
"version": "0.7.1"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
