Merge pull request #1 from prashantsinalkar/masterHEADmaster

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diff --git a/Machine_Design_by_T_H_Wentzell/20-Ball_and_Roller_Bearings.ipynb b/Machine_Design_by_T_H_Wentzell/20-Ball_and_Roller_Bearings.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 20: Ball and Roller Bearings"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 20.1: Life_Expectancy_of_Ball_Bearing.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-20.1 Page No.431\n');\n",
+"//L10 design life\n",
+"Cd=5050;\n",
+"Pd=2400;\n",
+"k=3;\n",
+"Ld1=(Cd/Pd)^k*10^6;\n",
+"Ld=Ld1/(1750*60);\n",
+"mprintf('\n L10 design life = %f hr.',Ld);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 20.2: Selection_of_Bearing_to_Meet_Given_Criteria.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-20.2 Page No.432\n');\n",
+"//Dynamic load capacity\n",
+"T=200;\n",
+"n=1750;\n",
+"L=T*n*60/10^6;\n",
+"Pd=2400;\n",
+"Ld=21;\n",
+"Lc=1;\n",
+"k=1/3;\n",
+"Cd=Pd*(Ld/Lc)^k\n",
+"mprintf('\n Dynamic load capacity required = %f lb.',Cd);\n",
+"mprintf('\n Bearing 6211 meets this criterion.');"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 20.3: Selection_of_Bearing_to_Meet_Given_Criteria.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-20.3 Page No.434\n');\n",
+"R=1200;\n",
+"Ft=500;\n",
+"n=1500;\n",
+"L10=5000;\n",
+"//Assume thrust factor=1.6\n",
+"Y=1.6;\n",
+"Pd=0.56*R+Y*Ft;\n",
+"Ld=n*L10*60/10^6;\n",
+"Lc=1;\n",
+"k=3;\n",
+"Cd=Pd*(Ld/Lc)^(1/k);\n",
+"//For bearing number 6215\n",
+"Cd1=11400;\n",
+"Cs1=9700;\n",
+"//Verify the assumption for Y\n",
+"Ft_Cs1=Ft/Cs1;\n",
+"Y=(0.056-Ft_Cs1)*(1.99-1.71)/(0.056-0.028)+1.71;\n",
+"Pd=0.56*R+Y*Ft;\n",
+"Cd=Pd*(Ld/Lc)^(1/k);\n",
+"if Cd>Cd1 then\n",
+"    mprintf('\n Since Cd of bearing < Cd required, So bearing number 6215 is not acceptable.');    \n",
+"end\n",
+"//For bearing number 6216\n",
+"Cd2=12600;\n",
+"Cs2=10500;\n",
+"Ft_Cs2=Ft/Cs2;\n",
+"Y=(0.056-Ft_Cs2)*(1.99-1.71)/(0.056-0.028)+1.71;\n",
+"Pd=0.56*R+Y*Ft;\n",
+"Cd=Pd*(Ld/Lc)^(1/k);\n",
+"if Cd<Cd2 then\n",
+"    mprintf('\n Since Cd of bearing > Cd required, So bearing number 6215 meets the design criteria.');\n",
+"end"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 20.4: Life_of_6200_Series_Bearing.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-20.4 Page No.436\n');\n",
+"//Thrust factor\n",
+"Ft=300;\n",
+"Cs=2320;\n",
+"Ft_Cs=Ft/Cs;\n",
+"Y=(0.17-Ft_Cs)*(1.45-1.31)/(0.17-0.11)+1.31;\n",
+"mprintf('\n Thrust factor = %f ',Y);\n",
+"V=1.2;\n",
+"X=0.56;\n",
+"R=1000;\n",
+"P=V*X*R+Y*Ft;\n",
+"Cd=3350;\n",
+"Pd=1095;\n",
+"k=3;\n",
+"Ld=(Cd/Pd)^k*10^6;\n",
+"mprintf('\n Life = %f revolutions.',Ld);"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}