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+{

+ "cells": [

+  {

+   "cell_type": "markdown",

+   "metadata": {},

+   "source": [

+    "#14: Acoustics of buildings and acoustic quieting"

+   ]

+  },

+  {

+   "cell_type": "markdown",

+   "metadata": {},

+   "source": [

+    "##Example number 14.1, Page number 14.7"

+   ]

+  },

+  {

+   "cell_type": "code",

+   "execution_count": 22,

+   "metadata": {

+    "collapsed": false

+   },

+   "outputs": [

+    {

+     "name": "stdout",

+     "output_type": "stream",

+     "text": [

+      "reverberation time of hall is 1.264 s\n"

+     ]

+    }

+   ],

+   "source": [

+    "#importing modules\n",

+    "import math\n",

+    "from __future__ import division\n",

+    "\n",

+    "#Variable declaration\n",

+    "V=475;     #volume(m**3)\n",

+    "aw=200;    #area of wall(m**2)\n",

+    "ac=100;    #area of ceiling(m**2)\n",

+    "ac_w=0.025;    #absorption coefficient of wall\n",

+    "ac_c=0.02;    #absorption coefficient of ceiling\n",

+    "ac_f=0.55;    #absorption coefficient of floor\n",

+    "\n",

+    "#Calculation\n",

+    "sigma_as=(aw*ac_w)+(ac*ac_c)+(ac*ac_f);     \n",

+    "T=0.165*V/sigma_as;          #reverberation time of hall(s)\n",

+    "\n",

+    "#Result\n",

+    "print \"reverberation time of hall is\",round(T,3),\"s\""

+   ]

+  },

+  {

+   "cell_type": "markdown",

+   "metadata": {},

+   "source": [

+    "##Example number 14.2, Page number 14.8"

+   ]

+  },

+  {

+   "cell_type": "code",

+   "execution_count": 23,

+   "metadata": {

+    "collapsed": false

+   },

+   "outputs": [

+    {

+     "name": "stdout",

+     "output_type": "stream",

+     "text": [

+      "new reverberation time is 1.31 s\n"

+     ]

+    }

+   ],

+   "source": [

+    "#importing modules\n",

+    "import math\n",

+    "from __future__ import division\n",

+    "\n",

+    "#Variable declaration\n",

+    "V=12500;     #volume(m**3)\n",

+    "T1=1.5;      #reverberation time(sec)\n",

+    "n=200;    #number of cushioned chairs\n",

+    "\n",

+    "#Calculation\n",

+    "sigma_as=0.165*V/T1;    \n",

+    "T2=0.165*V/(sigma_as+n);     #new reverberation time(s)\n",

+    "\n",

+    "#Result\n",

+    "print \"new reverberation time is\",round(T2,2),\"s\""

+   ]

+  },

+  {

+   "cell_type": "markdown",

+   "metadata": {},

+   "source": [

+    "##Example number 14.3, Page number 14.8"

+   ]

+  },

+  {

+   "cell_type": "code",

+   "execution_count": 24,

+   "metadata": {

+    "collapsed": false

+   },

+   "outputs": [

+    {

+     "name": "stdout",

+     "output_type": "stream",

+     "text": [

+      "total absorption in the hall is 660.0 OWU\n"

+     ]

+    }

+   ],

+   "source": [

+    "#importing modules\n",

+    "import math\n",

+    "from __future__ import division\n",

+    "\n",

+    "#Variable declaration\n",

+    "V=5000;    #volume(m**3)\n",

+    "T=1.25;    #time(s)\n",

+    "\n",

+    "#Calculation\n",

+    "sigma_as=0.165*V/T;          #total absorption in the hall(OWU)\n",

+    "\n",

+    "#Result\n",

+    "print \"total absorption in the hall is\",sigma_as,\"OWU\""

+   ]

+  },

+  {

+   "cell_type": "markdown",

+   "metadata": {},

+   "source": [

+    "##Example number 14.4, Page number 14.9"

+   ]

+  },

+  {

+   "cell_type": "code",

+   "execution_count": 25,

+   "metadata": {

+    "collapsed": false

+   },

+   "outputs": [

+    {

+     "name": "stdout",

+     "output_type": "stream",

+     "text": [

+      "total absorption in the hall is 1045.0 OWU\n",

+      "new period of reverberation is 1.369 s\n"

+     ]

+    }

+   ],

+   "source": [

+    "#importing modules\n",

+    "import math\n",

+    "from __future__ import division\n",

+    "\n",

+    "#Variable declaration\n",

+    "V=9500;    #volume(m**3)\n",

+    "T=1.5;    #time(s)\n",

+    "x=100;    #absorption(sabines)\n",

+    "\n",

+    "#Calculation\n",

+    "sigma_as=0.165*V/T;          #total absorption in the hall(OWU)\n",

+    "T=0.165*V/(sigma_as+x);      #new period of reverberation(s)\n",

+    "\n",

+    "#Result\n",

+    "print \"total absorption in the hall is\",sigma_as,\"OWU\"\n",

+    "print \"new period of reverberation is\",round(T,3),\"s\""

+   ]

+  },

+  {

+   "cell_type": "markdown",

+   "metadata": {},

+   "source": [

+    "##Example number 14.5, Page number 14.9"

+   ]

+  },

+  {

+   "cell_type": "code",

+   "execution_count": 26,

+   "metadata": {

+    "collapsed": false

+   },

+   "outputs": [

+    {

+     "name": "stdout",

+     "output_type": "stream",

+     "text": [

+      "total absorption in the hall is 70.714 OWU\n",

+      "average absorption coefficient is 0.074 sabine/m**2\n"

+     ]

+    }

+   ],

+   "source": [

+    "#importing modules\n",

+    "import math\n",

+    "from __future__ import division\n",

+    "\n",

+    "#Variable declaration\n",

+    "V=20*15*5;    #volume(m**3)\n",

+    "T=3.5;    #time(s)\n",

+    "A=950;    #surface area(m**2)\n",

+    "\n",

+    "#Calculation\n",

+    "sigma_as=0.165*V/T;          #total absorption in the hall(OWU)\n",

+    "ac=sigma_as/A;       #average absorption coefficient\n",

+    "\n",

+    "#Result\n",

+    "print \"total absorption in the hall is\",round(sigma_as,3),\"OWU\"\n",

+    "print \"average absorption coefficient is\",round(ac,3),\"sabine/m**2\""

+   ]

+  },

+  {

+   "cell_type": "markdown",

+   "metadata": {},

+   "source": [

+    "##Example number 14.6, Page number 14.9"

+   ]

+  },

+  {

+   "cell_type": "code",

+   "execution_count": 37,

+   "metadata": {

+    "collapsed": false

+   },

+   "outputs": [

+    {

+     "name": "stdout",

+     "output_type": "stream",

+     "text": [

+      "reverberation time of hall is 4.023 s\n",

+      "number of persons to be seated is 5\n"

+     ]

+    }

+   ],

+   "source": [

+    "#importing modules\n",

+    "import math\n",

+    "from __future__ import division\n",

+    "\n",

+    "#Variable declaration\n",

+    "V=2265;    #volume(m**3)\n",

+    "sigma_as=92.9;    #absorption(m**2)\n",

+    "a=18.6;      #area(m**2)\n",

+    "\n",

+    "#Calculation\n",

+    "T=0.165*V/sigma_as;          #reverberation time of hall(s)\n",

+    "T1=0.165*V/2;      \n",

+    "inc=T1-sigma_as;       #increase in absorption(OWU)\n",

+    "n=inc/a;        #number of persons to be seated\n",

+    "\n",

+    "#Result\n",

+    "print \"reverberation time of hall is\",round(T,3),\"s\"\n",

+    "print \"number of persons to be seated is\",int(n)"

+   ]

+  }

+ ],

+ "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": "2.7.9"

+  }

+ },

+ "nbformat": 4,

+ "nbformat_minor": 0

+}