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diff --git a/Fundamental_of_internal_combustion_engines/Chap13.ipynb b/Fundamental_of_internal_combustion_engines/Chap13.ipynb new file mode 100755 index 00000000..d404f5f6 --- /dev/null +++ b/Fundamental_of_internal_combustion_engines/Chap13.ipynb @@ -0,0 +1,124 @@ +{
+ "metadata": {
+ "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 13: Engine friction and lubrication"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 13.1 Page No 423"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Input data\n",
+ "d=0.08\t\t #The diameter of bore in m\n",
+ "L=0.075\t\t #The length of the stroke in m\n",
+ "l=0.152\t\t #The connecting rod length in m\n",
+ "h=0.062\t\t #Skirt length of the piston in m\n",
+ "Fr=8000\t\t #Compressive force in the connecting rod in N\n",
+ "p=3000\t\t #The pressure in the cylinder kPa\n",
+ "y=0.004*10**-3\t #The clearence between piston and cylinder wall in m\n",
+ "U=0.006\t\t #The dynamic viscosity of the lubricating oil in pa.s\n",
+ "u=8.2\t\t #The piston speed in m/s\n",
+ "\n",
+ "#Calculations\n",
+ "import math\n",
+ "ts=(U*u)/y\t #The shear stress in N/m**2\n",
+ "A=pi*d*h\t #Contact area between the piston and the cylinder in m**2\n",
+ "Ff=ts*A\t\t #Friction force on the piston inN\n",
+ "r=L/2.0\t\t #Crank length in m\n",
+ "A=math.atan(r/l)\t #The angle made by the crank in radians\n",
+ "Ft=Fr*sin(A)\t#The side thrust in N\n",
+ "\n",
+ "#Output \n",
+ "print\"The friction force on the piston \",round(Ff,0),\"N\"\n",
+ "print\"The thrust force on the cylinder wall is\",round(Ft,0),\"N\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The friction force on the piston 192.0 N\n",
+ "The thrust force on the cylinder wall is 1916.0 N\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 13.2 Page No 424"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Input data\n",
+ "d=0.065\t\t#The cylinder bore diameter in m\n",
+ "L=6.0\t\t#The length of the stroke in cm\n",
+ "l=12.0\t\t#The length of the connecting rod in cm\n",
+ "p=50.0\t\t#The pressure in the cylinder in bar\n",
+ "q=90.0\t\t#The crank position in power stroke of the cycle for one cylinder in degrees\n",
+ "Ff=900.0\t\t#Friction force in N\n",
+ "o=0.2\t\t#Wrist pin off set in cm\n",
+ "\n",
+ "#Calculations\n",
+ "r=L/2.0\t\t#The crank length in cm\n",
+ "sineA=r/l\t \n",
+ "cosA=(1-(sineA)**2)**(1/2.0)\t\n",
+ "Fr=(((p*10**5*(pi/4.0)*d**2)-Ff)/cosA)/1000.0 \n",
+ "Ft=Fr*sineA\t #The side thrust on the piston in kN\n",
+ "sineA1=(r-o)/l\t#The value of sine\n",
+ "cosA1=(1-(sineA1)**2)**(1/2.0)\t\t\t\n",
+ "Fr1=(((p*10**5*(pi/4.0)*d**2)-Ff)/cosA1)/1000.0\t\n",
+ "Ft1=Fr1*sineA1 #The side thrust in kN\n",
+ "\n",
+ "#Output \n",
+ "print\"(a) The force in the connecting rod \",round(Fr,3),\" kN\"\n",
+ "print\"The side thrust on the piston =\",round(Ft,2),\"kN\"\n",
+ "print\"(b) The side thrust on the piston =\",round(Ft1,3),\" kN\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "(a) The force in the connecting rod 16.206 kN\n",
+ "The side thrust on the piston = 4.05 kN\n",
+ "(b) The side thrust on the piston = 3.765 kN\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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