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{
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Ch:29 Gearbox"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"exa 29-1 - Page 749"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from math import sqrt, pi\n",
"Ts1=16#\n",
"Ts2=18#\n",
"Ts3=20#\n",
"Ts4=25#\n",
"Tr1=64#\n",
"Tr2=63#\n",
"Tr3=70#\n",
"Tr4=50#\n",
"#Let Nr1/Nr2=G1\n",
"G1=1+(Ts1/Tr1)#\n",
"#Let Nr1/Ni=G2\n",
"G2=(Ts2/(Tr2*(1-(1/G1)+(Ts2/Tr2))))#\n",
"#Let Ni/No=G3 (third gear)\n",
"G3=(1+(Ts3/Tr3))/((Ts3/Tr3)+G2)#\n",
"\n",
"#Let Ni/Nr1=G4\n",
"#The ratio calculations are done as above\n",
"G4=1.2857/0.2857#\n",
"#Let Ni/No =G5(second gear)\n",
"G5=-20/70#\n",
"#Let Ni/No=G6(first gear)\n",
"G6=1.2857/0.2857#\n",
"#Let Ni/No=G7(reverse gear)\n",
"G7=-1.7143/0.2857#\n",
"print \"ratio for third gear is %0.3f \"%(G3)#\n",
"print \"\\nratio for second gear is %0.4f \"%(G5)#\n",
"print \"\\nratio for first gear is %0.1f \"%(G6)#\n",
"print \"\\nratio for reverse gear is %0.3f \"%(G7)#\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"ratio for third gear is 1.471 \n",
"\n",
"ratio for second gear is -0.2857 \n",
"\n",
"ratio for first gear is 4.5 \n",
"\n",
"ratio for reverse gear is -6.000 \n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"exa 29-2 - Page 751"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Let reverse speed gear be RSG\n",
"RSG=5.5#\n",
"#Let T5/T6 = Z1\n",
"T1=2#\n",
"#Let T3/T7 = Z2\n",
"Z2=2.75#\n",
"T7=18#\n",
"T3=Z2*T7#\n",
"T3=50#\n",
"#Let T3/T1 =Z3\n",
"Z3=2.5#\n",
"T1=T3/Z3#\n",
"#Let T4/T2 = Z4\n",
"Z4=2.25/2#\n",
"T2=(T1+T3)/(Z4+1)#\n",
"T4=T1+T3-T2#\n",
"#Let T5/T6=Z5\n",
"Z5=2#\n",
"T6=(T1+T3)/3#\n",
"T5=(T1+T3)-T6#\n",
"T7=18#\n",
"#let first gear ratio is G1\n",
"G1=50*47/(20*23)#\n",
"\n",
"#Let 2nd gear ratio is G2\n",
"G2=37*47/(33*23)#\n",
"#Let 3rd gear ratio is G3\n",
"G3=1#\n",
"#Let reverse gear ratio is R\n",
"R=50*47/(18*23)#\n",
"print \"T1 is %0.0f \"%(T1)#\n",
"print \"\\nT2 is %0.0f \"%(T2)#\n",
"print \"\\nT3 is %0.0f \"%(T3)#\n",
"print \"\\nT4 is %0.0f \"%(T4)#\n",
"print \"\\nT5 is %0.0f \"%(T5)#\n",
"print \"\\nT6 is %0.0f \"%(T6)#\n",
"print \"\\nT7 is %0.0f \"%(T7)#\n",
"print \"\\nG1 is %0.3f \"%(G1)#\n",
"print \"\\nG2 is %0.3f \"%(G2)#\n",
"print \"\\nG3 is %0.1f \"%(G3)#\n",
"print \"\\nR is %0.3f \"%(R)#\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"T1 is 20 \n",
"\n",
"T2 is 33 \n",
"\n",
"T3 is 50 \n",
"\n",
"T4 is 37 \n",
"\n",
"T5 is 47 \n",
"\n",
"T6 is 23 \n",
"\n",
"T7 is 18 \n",
"\n",
"G1 is 5.109 \n",
"\n",
"G2 is 2.291 \n",
"\n",
"G3 is 1.0 \n",
"\n",
"R is 5.676 \n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"exa 29-3 - Page 752"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Let the constant gear ratio be G\n",
"G=2#\n",
"x=5.5**(1/3)#\n",
"G1=1#\n",
"G2=x#\n",
"G3=x*x#\n",
"G4=x**3#\n",
"T7=18#\n",
"T8=T7*(x**3)/2#\n",
"T8=51#\n",
"T5=69/2.558#\n",
"T6=69-27#\n",
"T4=69/1.8825#\n",
"T3=69-T4#\n",
"T1=23#\n",
"T2=46#\n",
"T9=18#\n",
"G1=T2*T8/(T1*T7)#\n",
"G2=T2*T6/(T1*T5)#\n",
"G3=1#\n",
"G4=-T2*T8/(T1*T9)#\n",
"print \"T1 is %0.0f \"%(T1)#\n",
"print \"\\nT2 is %0.0f \"%(T2)#\n",
"print \"\\nT3 is %0.0f \"%(T3)#\n",
"print \"\\nT4 is %0.0f \"%(T4)#\n",
"print \"\\nT5 is %0.0f \"%(T5)#\n",
"print \"\\nT6 is %0.0f \"%(T6)#\n",
"print \"\\nT7 is %0.0f \"%(T7)#\n",
"print \"\\nT8 is %0.0f \"%(T8)#\n",
"print \"\\nT9 is %0.0f \"%(T9)#\n",
"print \"\\nG1 is %0.3f \"%(G1)#\n",
"print \"\\nG2 is %0.3f \"%(G2)#\n",
"print \"\\nG3 is %0.3f \"%(G3)#\n",
"print \"\\nG4 is %0.3f \"%(G4)#"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"T1 is 23 \n",
"\n",
"T2 is 46 \n",
"\n",
"T3 is 32 \n",
"\n",
"T4 is 37 \n",
"\n",
"T5 is 27 \n",
"\n",
"T6 is 42 \n",
"\n",
"T7 is 18 \n",
"\n",
"T8 is 51 \n",
"\n",
"T9 is 18 \n",
"\n",
"G1 is 5.667 \n",
"\n",
"G2 is 3.114 \n",
"\n",
"G3 is 1.000 \n",
"\n",
"G4 is -5.667 \n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
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