git.gag.com Git - sw/motorsim/blob - src/com/billkuker/rocketry/motorsim/fuel/SaintRobertFuel.java

   1 package com.billkuker.rocketry.motorsim.fuel;\r
   2 \r
   3 import javax.measure.quantity.Pressure;\r
   4 import javax.measure.quantity.Velocity;\r
   5 import javax.measure.quantity.VolumetricDensity;\r
   6 import javax.measure.unit.NonSI;\r
   7 import javax.measure.unit.Unit;\r
   8 \r
   9 import org.jscience.physics.amount.Amount;\r
  10 \r
  11 import com.billkuker.rocketry.motorsim.Fuel;\r
  12 import com.billkuker.rocketry.motorsim.RocketScience;\r
  13 \r
  14 public abstract class SaintRobertFuel implements Fuel {\r
  15         \r
  16         public static enum Type{\r
  17                 SI(\r
  18                                 javax.measure.unit.SI.MILLIMETER.divide(javax.measure.unit.SI.SECOND).asType(Velocity.class),\r
  19                                 javax.measure.unit.SI.MEGA(javax.measure.unit.SI.PASCAL).asType(Pressure.class)),\r
  20                 NONSI(\r
  21                                 NonSI.INCH.divide(javax.measure.unit.SI.SECOND).asType(Velocity.class),\r
  22                                 RocketScience.PSI)\r
  23                 ;\r
  24                 \r
  25                 private final Unit<Velocity> v;\r
  26                 private final Unit<Pressure> p;\r
  27                 \r
  28                 Type( Unit<Velocity> v, Unit<Pressure> p){\r
  29                         this.p = p;\r
  30                         this.v = v;\r
  31                 }\r
  32         }\r
  33         \r
  34         private Type t = Type.SI;\r
  35         \r
  36         public SaintRobertFuel(Type t){\r
  37                 if ( t == null )\r
  38                         throw new IllegalArgumentException("Type must be non-null");\r
  39                 this.t = t;\r
  40         }\r
  41         \r
  42         public Type getType(){\r
  43                 return t;\r
  44         }\r
  45         \r
  46         protected void setType(final Type t){\r
  47                 this.t = t;\r
  48         }\r
  49 \r
  50         public Amount<Velocity> burnRate(Amount<Pressure> pressure) {\r
  51 \r
  52                 \r
  53                 double p = pressure.doubleValue(getType().p);\r
  54                 double a = burnrateCoefficient(pressure);\r
  55                 double n = burnrateExponent(pressure);\r
  56                 \r
  57                 return burnrateConstant().plus(Amount.valueOf( a*Math.pow(p,n), getType().v ));\r
  58         }\r
  59         \r
  60         protected abstract double burnrateCoefficient(Amount<Pressure> pressure);\r
  61         \r
  62         protected abstract double burnrateExponent(Amount<Pressure> pressure);\r
  63         \r
  64         protected Amount<Velocity> burnrateConstant(){\r
  65                 return Amount.valueOf(0, Velocity.UNIT);\r
  66         }\r
  67 \r
  68         public abstract Amount<VolumetricDensity> getIdealDensity();\r
  69         \r
  70         public String getName(){\r
  71                 return this.getClass().getSimpleName();\r
  72         }\r
  73         \r
  74         public String toString(){\r
  75                 return getName();\r
  76         }\r
  77 }\r