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| author | hardythe1 | 2015-04-07 15:58:05 +0530 |
|---|---|---|
| committer | hardythe1 | 2015-04-07 15:58:05 +0530 |
| commit | 92cca121f959c6616e3da431c1e2d23c4fa5e886 (patch) | |
| tree | 205e68d0ce598ac5caca7de839a2934d746cce86 /Engineering_Physics_/Chapter5.ipynb | |
| parent | b14c13fcc6bb6d01c468805d612acb353ec168ac (diff) | |
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added books
Diffstat (limited to 'Engineering_Physics_/Chapter5.ipynb')
| -rwxr-xr-x | Engineering_Physics_/Chapter5.ipynb | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/Engineering_Physics_/Chapter5.ipynb b/Engineering_Physics_/Chapter5.ipynb new file mode 100755 index 00000000..781fd57b --- /dev/null +++ b/Engineering_Physics_/Chapter5.ipynb @@ -0,0 +1,170 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:4126f9237f2a14d1c68d93136eb798698a28e20e098ed4ce42f02e377a8fbabb"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "5: Acoustics"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.1, Page number 97"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "T1=1.5; #R time for empty hall(s)\n",
+ "T2=1; #R time with curtain cloth(s)\n",
+ "A=20; #area of absorber(sq.m)\n",
+ "V=10*8*6; #volume of hall(cu.m)\n",
+ "\n",
+ "#Calculation\n",
+ "a=((0.161*V)/(2*A))*((1/T2)-(1/T1)); #absorption coefficient\n",
+ "\n",
+ "#Result\n",
+ "print \"absorption coefficient is\",round(a,2),\"Sabines\"\n",
+ "print \"answer given in the book varies due to rounding off errors\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "absorption coefficient is 0.64 Sabines\n",
+ "answer given in the book varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.2, Page number 97"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "V=20*15*10; #volume of hall(cu.m)\n",
+ "T1=3.5; #reverberation time(s)\n",
+ "l=20; \n",
+ "b=15;\n",
+ "h=10; #dimensions of hall\n",
+ "am=0.5; #absorption coefficient\n",
+ "T2=2.5; #reverberation time after cloth use(s)\n",
+ "\n",
+ "\n",
+ "#Calculation\n",
+ "A=(0.161*V)/T1; \n",
+ "S=2*((l*b)+(b*h)+(h*l)); #surface area(sq.m)\n",
+ "sigma_a=A/S; #average absorption coefficient of hall(o.w.u)\n",
+ "S1=(((0.161*V)/(am-sigma_a))*((1/T2)-(1/T1))); #area of wall covered by curtain cloth(sq.m)\n",
+ "\n",
+ "#Result\n",
+ "print \"average absorption coefficient of hall is\",round(sigma_a,3),\"o.w.u\"\n",
+ "print \"area of wall covered by curtain cloth is\",round(S1,3),\"sq.m\"\n",
+ "print \"answer for area covered S1 varies due to rounding off errors\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "average absorption coefficient of hall is 0.106 o.w.u\n",
+ "area of wall covered by curtain cloth is 140.156 sq.m\n",
+ "answer for area covered S1 varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.3, Page number 98"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "V=1450; #volume of hall(cu.m)\n",
+ "A1=112*0.03; #absorption due to plastered wall\n",
+ "A2=130*0.06; #absorption due to wooden floor\n",
+ "A3=170*0.04; #absorption due to plastered ceiling\n",
+ "A4=20*0.06; #absorption due to wooden door\n",
+ "A5=100*1; #absorption due to cushioned chairs\n",
+ "\n",
+ "#Calculation\n",
+ "sigma_as=A1+A2+A3+A4+A5; #total absorption in empty hall\n",
+ "T1=(0.161*V)/sigma_as; #reverberation time case-1(s)\n",
+ "T2=(0.161*V)/(sigma_as+(60*4.7)); #persons=60,A=4.7 case-2\n",
+ "T3=(0.161*V)/(sigma_as+(100*4.7)); #seat cushioned=100 case-3\n",
+ "\n",
+ "#Result\n",
+ "print \"reverberation time for case-1 is\",round(T1,3),\"sec\"\n",
+ "print \"reverberation time for case-2 is\",round(T2,3),\"sec\"\n",
+ "print \"reverberation time for case-3 is\",round(T3,3),\"sec\"\n",
+ "print \"answer for T3 given in the book is wrong\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "reverberation time for case-1 is 1.959 sec\n",
+ "reverberation time for case-2 is 0.582 sec\n",
+ "reverberation time for case-3 is 0.396 sec\n",
+ "answer for T3 given in the book is wrong\n"
+ ]
+ }
+ ],
+ "prompt_number": 12
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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