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{
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 5: Valve Diagrams and Valve Gears"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1, Page 147"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Variable declaration\n",
"s=1.125#inch\n",
"e=0.25#inch\n",
"t=2.25#inch\n",
"alpha=35#degrees\n",
"\n",
"#Calculations\n",
"#from 5.2, we know theta+alpha=sininverse(s/t)\n",
"x=math.degrees(math.asin(s/t))\n",
"y=180-x#sin(x)=sin(180-x)=sin(y)\n",
"#at admission\n",
"p=x-alpha\n",
"#at cutoff\n",
"q=y-alpha\n",
"#from 5.3, theta+alpha=sininnverse(-e/t)\n",
"ang=math.degrees(math.asin(-e/t))\n",
"angle=abs(ang)\n",
"a=180+angle#lies in the negative region of sine curve\n",
"b=360-angle#lies in hte negative region of sine curve\n",
"#at release\n",
"r=a-alpha\n",
"#at compression\n",
"s=b-alpha\n",
"\n",
"#Results\n",
"print \"Angle theta at admission, cut-off,release and compression are %.2f, %.2f, %.2f and %.2f degrees respectively\"%(p,q,r,s)\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Angle theta at admission, cut-off,release and compression are -5.00, 115.00, 151.38 and 318.62 degrees respectively\n"
]
}
],
"prompt_number": 9
}
],
"metadata": {}
}
]
}
|
