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+{
+"cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# Chapter 17: SLIDING CONTACT BEARINGS"
+ ]
+ },
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 17.1: SCB1.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// sum 17-1\n",
+"clc;\n",
+"clear;\n",
+"Ta=22;\n",
+"u=7/10^9;\n",
+"nj=20;\n",
+"r=25;\n",
+"l=2*r;\n",
+"Ao=30000;\n",
+"Uo=15.3/10^3;\n",
+"c=0.025;\n",
+"//specific weight of the material is rho\n",
+"rho=8.46*(10^-6);\n",
+"Cp=179.8;\n",
+"Tf=Ta+(16*%pi^3*u*nj^2*l*r^3/(Uo*Ao*c));\n",
+"// avg mean film temperature is Tav\n",
+"Tav=(Tf-Ta)/2;\n",
+"x= l*c*rho*%pi*r*nj*Cp*10^3;\n",
+"y=Ao*Tav*Uo;\n",
+"delT=y/x;\n",
+"\n",
+" // printing data in scilab o/p window\n",
+" printf('Tav is %0.2f degC ',Tav);\n",
+" printf('\n delT is %0.1f degC ',delT);"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 17.2: SCB2.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// sum 17-2\n",
+"clc;\n",
+"clear;\n",
+"l=60;\n",
+"d=60;\n",
+"r=d/2;\n",
+"ho=0.008;\n",
+"c=0.04;\n",
+"S=0.0446;\n",
+"nj=1260/60;\n",
+"W=6000;\n",
+"p=W/(l*d);\n",
+"u=S*(c/r)^2*p/nj;\n",
+"u=u*10^9;\n",
+"\n",
+" // printing data in scilab o/p window\n",
+" printf('u is %0.3f cP ',u);"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 17.3: SCB3.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// sum 17-3\n",
+"clc;\n",
+"clear;\n",
+"d=60;\n",
+"r=30;\n",
+"l=60;\n",
+"c=0.8*10^-3*r;\n",
+"ho=0.2*c;\n",
+"W=21000/2;\n",
+"p=W/(l*d);\n",
+"S=0.0446;\n",
+"nj=1440/60;\n",
+"u=S*(c/r)^2*p/nj;\n",
+"u=u*10^9;\n",
+"// since Q/(r*nj*l)=4.62\n",
+"Q=4.62*r*c*nj*l;\n",
+"Q=Q*60/10^6;\n",
+"\n",
+" // printing data in scilab o/p window\n",
+" printf('u is %0.3f cP ',u);\n",
+" printf('\n Q is %0.4f lpm ',Q);"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 17.4: SCB4.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// sum 17-4\n",
+"clc;\n",
+"clear;\n",
+"l=60;\n",
+"d=60;\n",
+"r=d/2;\n",
+"W=3000;\n",
+"p=W/(l*d);\n",
+"u=30*10^-9;\n",
+"c=0.06;\n",
+"nj=1440/60;\n",
+"S=(r/c)^2*u*nj/p;\n",
+"//For ratio l/d=1, values of different parameters are given in matrix A corresponding to S\n",
+"A=[1 0.264 0.6 5.79 3.99\n",
+" 1 0.121 0.4 3.22 4.33];\n",
+"//let ho/c=x\n",
+"x=(A(1,3))-((A(1,3)-(A(2,3)))*((A(1,2))-S)/((A(1,2))-(A(2,2))));\n",
+"//let y= (r/c)*f=CFV\n",
+"y=(A(1,4))-((A(1,4)-(A(2,4)))*((A(1,2))-S)/((A(1,2))-(A(2,2))));\n",
+"//let z=Q/(r*c*nj*l)=FV\n",
+"z=(A(1,5))-((A(1,5)-(A(2,5)))*((A(1,2))-S)/((A(1,2))-(A(2,2))));\n",
+"f=y*c/r;\n",
+"ho=x*c;\n",
+"Q=z*r*c*nj*l;\n",
+"Q=Q*60/10^6;\n",
+"delT=8.3*p*y/z;\n",
+"//let power lost in friction be Pf\n",
+"Pf=2*%pi*nj*f*W*r/10^6;\n",
+"\n",
+" // printing data in scilab o/p window\n",
+" printf('f is %0.5f ',f);\n",
+" printf('\n ho is %0.3f mm ',ho);\n",
+" printf('\n Q is %0.3f lpm ',Q);\n",
+" printf('\n delT is %0.1f degC ',delT);\n",
+" printf('\n Pf is %0.4f KW ',Pf);"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 17.5: SCB5.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// sum 17-5\n",
+"clc;\n",
+"clear;\n",
+"W=22000;\n",
+"nj=960/60;\n",
+"p=2.4;\n",
+"u=20*10^-9;\n",
+"d=sqrt(W/p);\n",
+"d=96;\n",
+"r=d/2;\n",
+"l=d;\n",
+"S=0.0446;\n",
+"pact=W/(l*d);\n",
+"//x=r/c;\n",
+"x=sqrt(S*pact/(u*nj));\n",
+"c=r/x;\n",
+"ho=0.2*c;\n",
+"Q=r*c*nj*l*4.62;\n",
+"Q=Q*60/10^6;\n",
+"\n",
+" // printing data in scilab o/p window\n",
+" printf('d is %0.0f mm ',d);\n",
+" printf('\n l is %0.0f mm ',l);\n",
+" printf('\n ho is %0.4f mm ',ho);\n",
+" printf('\n Q is %0.3f lpm ',Q);\n",
+" \n",
+" //The difference in answer to Q is due to rounding -off the value of c."
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 17.6: SCB6.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// sum 17-6\n",
+"clc;\n",
+"clear;\n",
+"W=400*10^3;\n",
+"Ro=200;\n",
+"Ri=160;\n",
+"ho=0.1;\n",
+"t=150;\n",
+"// specific gravity is rho\n",
+"rho=0.86;\n",
+"pi=2*W*log(Ro/Ri)/(%pi*(Ro^2-Ri^2));\n",
+"zk=(0.22*t)-(180/t);\n",
+"z=rho*zk;\n",
+"u=z/(10^9);\n",
+"Q=%pi*pi*ho^3/(6*u*log(Ro/Ri));\n",
+"Q=Q*60/10^6;\n",
+"\n",
+" // printing data in scilab o/p window\n",
+" printf('pi is %0.3f MPa ',pi);\n",
+" printf('\n Q is %0.2f lpm ',Q);\n",
+" \n",
+" //The difference in answer to Q is due to rounding -off of values."
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 17.7: SCB7.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"//sum 17-7\n",
+"clc;\n",
+"clear;\n",
+"//let number of pads be n\n",
+"n=4;\n",
+"W=100*10^3;\n",
+"Ro=125;\n",
+"Ri=50;\n",
+"t=200;\n",
+"ho=0.15;\n",
+"pi=2*W*log(Ro/Ri)/(%pi*(Ro^2-Ri^2));\n",
+"zk=(0.22*t)-(180/t);\n",
+"// specific gravity is rho\n",
+"rho=0.86;\n",
+"z=rho*zk;\n",
+"u=z/(10^9);\n",
+"Q=%pi*pi*ho^3/(6*u*log(Ro/Ri));\n",
+"Q=Q*60/10^6;\n",
+"\n",
+" // printing data in scilab o/p window\n",
+" printf('pi is %0.2f MPa ',pi);\n",
+" printf('\n Q is %0.3f lpm ',Q);"
+ ]
+ }
+],
+"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
+}
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