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diff --git a/Engineering_Physics_by_S.L.Gupta,_Sanjeev_Gupta/Chapter14_1.ipynb b/Engineering_Physics_by_S.L.Gupta,_Sanjeev_Gupta/Chapter14_1.ipynb new file mode 100644 index 00000000..c2a5b523 --- /dev/null +++ b/Engineering_Physics_by_S.L.Gupta,_Sanjeev_Gupta/Chapter14_1.ipynb @@ -0,0 +1,226 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# 14: Acoustics of Buildings and Acoustic Quieting" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example number 14.1, Page number 399" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "total absorption in hall is 825.0 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=1.5; #time(sec)\n", + "\n", + "#Calculations\n", + "aS=0.165*V/T; #total absorption in hall(OWU)\n", + "\n", + "#Result\n", + "print \"total absorption in hall is\",aS,\"OWU\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example number 14.2, Page number 399" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "reverberation time when hall is empty is 2.08 sec\n", + "reverberation time with full capacity of audience is 0.362 sec\n", + "reverberation time with audience in cushioned chairs is 0.42 sec\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration \n", + "V=1500; #volume(m**3)\n", + "A1=112; #area of plastered walls(m**2)\n", + "A2=130; #area of wooden floor(m**2)\n", + "A3=170; #area of plastered ceiling(m**2)\n", + "A4=20; #area of wooden door(m**2)\n", + "n=100; #number of cushioned chairs\n", + "A5=120; #area of audience(m**2)\n", + "C1=0.03; #coefficient of absorption in plastered walls\n", + "C2=0.06; #coefficient of absorption in wooden floor\n", + "C3=0.04; #coefficient of absorption in plastered ceiling\n", + "C4=0.06; #coefficient of absorption in wooden door\n", + "C5=1.0; #coefficient of absorption in cushioned chairs\n", + "C6=4.7; #coefficient of absorption in audience\n", + "\n", + "#Calculations\n", + "a1=A1*C1; #absorption due to plastered walls\n", + "a2=A2*C2; #absorption due to wooden floor\n", + "a3=A3*C3; #absorption due to plastered ceiling\n", + "a4=A4*C4; #absorption due to wooden door\n", + "a5=n*C5; #absorption due to cushioned chairs\n", + "a6=A5*C6; #absorption due to audience \n", + "aS=a1+a2+a3+a4+a5; #total absorption in hall\n", + "T1=0.165*V/aS; #reverberation time when hall is empty(sec)\n", + "T2=0.165*V/(aS+a6); #reverberation time with full capacity of audience(sec)\n", + "T3=0.165*V/((n*C6)+aS); #reverberation time with audience in cushioned chairs(sec)\n", + "\n", + "#Result\n", + "print \"reverberation time when hall is empty is\",round(T1,2),\"sec\"\n", + "print \"reverberation time with full capacity of audience is\",round(T2,3),\"sec\"\n", + "print \"reverberation time with audience in cushioned chairs is\",round(T3,2),\"sec\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example number 14.3, Page number 401" + ] + }, + { + "cell_type": "code", + "execution_count": 3, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "average sound absorption coefficient is 0.24\n", + "reverberation time is 1.8 sec\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration \n", + "V=1200; #volume(m**3)\n", + "a1=220; #area of wall(m**2)\n", + "a2=120; #area of floor(m**2)\n", + "a3=120; #area of ceiling(m**2)\n", + "C1=0.03; #coefficient of absorption in wall\n", + "C2=0.80; #coefficient of absorption in floor\n", + "C3=0.06; #coefficient of absorption in ceiling\n", + "\n", + "#Calculations\n", + "A1=a1*C1; #absorption due to plastered walls\n", + "A2=a2*C2; #absorption due to wooden floor\n", + "A3=a3*C3; #absorption due to plastered ceiling\n", + "aS=a1+a2+a3; #total absorption in hall\n", + "abar=(A1+A2+A3)/aS; #average sound absorption coefficient\n", + "AS=abar*aS; #total absorption of room(metric sabines)\n", + "T=0.165*V/AS; #reverberation time(sec)\n", + "\n", + "#Result\n", + "print \"average sound absorption coefficient is\",round(abar,2)\n", + "print \"reverberation time is\",round(T,1),\"sec\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example number 14.4, Page number 401" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "acoustic power is 1.4e-06 watt\n", + "answer in the book is wrong\n" + ] + } + ], + "source": [ + "#importing modules\n", + "import math\n", + "from __future__ import division\n", + "\n", + "#Variable declaration \n", + "I0=10**-12; #standard intensity level(watt/m**2)\n", + "A=1.4; #area(m**2)\n", + "il=60; #intensity level(decibels)\n", + "\n", + "#Calculations\n", + "x=10**(il/10);\n", + "I=x*10**-12; #intensity level(watt/m**2)\n", + "Ap=I*A; #acoustic power(watt)\n", + "\n", + "#Result\n", + "print \"acoustic power is\",Ap,\"watt\"\n", + "print \"answer in the book is wrong\"" + ] + } + ], + "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 +} |