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Diffstat (limited to 'The_Theory_of_Machines_by_T._Bevan/ch7.ipynb')
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diff --git a/The_Theory_of_Machines_by_T._Bevan/ch7.ipynb b/The_Theory_of_Machines_by_T._Bevan/ch7.ipynb new file mode 100644 index 00000000..cdee4ed4 --- /dev/null +++ b/The_Theory_of_Machines_by_T._Bevan/ch7.ipynb @@ -0,0 +1,134 @@ +{ + "metadata": { + "name": "" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 7: Belt, Rope and Chain Drive" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 1, Page 228" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Variable declaration\n", + "#given-belt is perfectly elastic and massless \n", + "u=0.3\n", + "v=3600#ft/min\n", + "V=v/60#ft/sec\n", + "theta=165#degrees\n", + "\n", + "#Calculations\n", + "x=theta*math.pi/180\n", + "k=math.e**(u*x)#k=T1/T2=e^(u*x)\n", + "To=500#lb\n", + "T1=2*k*To/(k+1)\n", + "T2=T1/k\n", + "T=T1-T2#effective tension\n", + "H=T*V/550#horsepower transmitted\n", + "\n", + "#Result\n", + "print \"The horse-power transmitted = %.2f\"%H" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The horse-power transmitted = 44.40\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 2, Page 234" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Variable declaration\n", + "w=1.2#lb/ft^2\n", + "u=0.3\n", + "v=3600#ft/min\n", + "V=v/60#ft/sec\n", + "theta=165#degrees\n", + "g=32.2#ft/s^2\n", + "\n", + "#Calculations\n", + "x=theta*math.pi/180\n", + "k=math.e**(u*x)#k=T1/T2=e^(u*x)\n", + "To=500#lb\n", + "#Solution a)Vertical drive\n", + "Tc=w*V**2/g#equation 7.5\n", + "#solution a)\n", + "H=2*(k-1)*(To-Tc)*V/((k+1)*550)\n", + "Vmax=(To*g/(3*w))**(1./2)\n", + "Hmax=2*(k-1)*(To-Tc)*Vmax/((k+1)*550)\n", + "#Solution b)\n", + "To1=To+Tc\n", + "#from equation 7.15 2/To1^2=1/Tt^2+1/Ts^2\n", + "#T1/T2=k\n", + "T2=367 #lb - from trail and error\n", + "T1=k*T2\n", + "Tt=T1+Tc\n", + "Ts=T2+Tc\n", + "HP=(T1-T2)*V/550\n", + "\n", + "#Results\n", + "print \"Solution a)\\nHorsepower transmitted= %.1f\\nMaximum Horsepower transmitted= %.1f (at velocit = %.1f ft/s^2)\"\\\n", + " \"\\n\\nSolution b)\\nTt=%.f lb\\nTs=%.f lb\\nHorsepower transmitted= %.1f\"%(H,Hmax,Vmax,Tt,Ts,HP)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Solution a)\n", + "Horsepower transmitted= 32.5\n", + "Maximum Horsepower transmitted= 36.2 (at velocit = 66.9 ft/s^2)\n", + "\n", + "Solution b)\n", + "Tt=1005 lb\n", + "Ts=501 lb\n", + "Horsepower transmitted= 54.9\n" + ] + } + ], + "prompt_number": 3 + } + ], + "metadata": {} + } + ] +}
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