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diff --git a/Engineering_Physics_by_P.K.Palanisamy/Chapter14_2.ipynb b/Engineering_Physics_by_P.K.Palanisamy/Chapter14_2.ipynb new file mode 100755 index 00000000..ef73934a --- /dev/null +++ b/Engineering_Physics_by_P.K.Palanisamy/Chapter14_2.ipynb @@ -0,0 +1,281 @@ +{
+ "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
+}
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