-package com.billkuker.rocketry.motorsim.fuel;\r
-\r
-import java.net.URI;\r
-import java.util.HashMap;\r
-import java.util.Map;\r
-import java.util.NoSuchElementException;\r
-import java.util.SortedMap;\r
-import java.util.TreeMap;\r
-\r
-import javax.measure.quantity.Dimensionless;\r
-import javax.measure.quantity.Pressure;\r
-import javax.measure.quantity.Velocity;\r
-import javax.measure.quantity.VolumetricDensity;\r
-import javax.measure.unit.SI;\r
-\r
-import org.apache.log4j.Logger;\r
-import org.jscience.physics.amount.Amount;\r
-\r
-import com.billkuker.rocketry.motorsim.Fuel;\r
-import com.billkuker.rocketry.motorsim.visual.Chart;\r
-\r
-public class PiecewiseLinearFuel implements Fuel{\r
- private static final Logger log = Logger.getLogger(PiecewiseLinearFuel.class);\r
- private static final Amount<Pressure> ZERO_PRESSURE =Amount.valueOf(0, SI.PASCAL);\r
- private static final Amount<Velocity> ZERO_VELOCITY =Amount.valueOf(0, SI.METERS_PER_SECOND);\r
-\r
- private static class Entry implements Comparable<Entry>{\r
- Amount<Pressure> pressure;\r
- Amount<Velocity> burnRate;\r
- @Override\r
- public int compareTo(Entry o) {\r
- if ( o.pressure.approximates(pressure) )\r
- return 0;\r
- return o.pressure.isGreaterThan(pressure)?-1:1;\r
- }\r
- }\r
-\r
- \r
- private String name = "New Linear Fuel";\r
- private URI uri;\r
- private double combustionEfficiency = .97;\r
- private double densityRatio = .96;\r
- private Amount<VolumetricDensity> density = Amount.valueOf(1889, 0, SI.KILOGRAM.divide(SI.METER.pow(3))).to(VolumetricDensity.UNIT);\r
-\r
- \r
- private EditableCombustionProduct product = new EditableCombustionProduct();\r
- private SortedMap<Amount<Pressure>, Entry> entries ;\r
-\r
- public PiecewiseLinearFuel(){\r
- clear();\r
- }\r
- public void add(final Amount<Pressure> p, final Amount<Velocity> r){\r
- entries.put(p, new Entry(){{pressure = p; burnRate = r;}});\r
- }\r
- \r
- @Override\r
- public Amount<Velocity> burnRate(final Amount<Pressure> pressure) {\r
- if ( pressure.isLessThan(ZERO_PRESSURE) )\r
- return ZERO_VELOCITY;\r
- \r
- if ( entries.size() == 1 ){\r
- return entries.get(entries.firstKey()).burnRate;\r
- }\r
- \r
- if ( entries.containsKey(pressure) ){\r
- return entries.get(pressure).burnRate;\r
- }\r
- \r
- Entry low = null;\r
- low = entries.get(entries.headMap(pressure).lastKey());\r
- Entry high = null;\r
- try {\r
- high = entries.get(entries.tailMap(pressure).firstKey());\r
- } catch ( NoSuchElementException e ){\r
- log.warn("Pressure " + pressure + " is outside of expiermental range for " + this.getName());\r
- high = low;\r
- low = entries.get(entries.headMap(low.pressure).lastKey());\r
- }\r
- \r
- Amount<Pressure> lowToHigh = high.pressure.minus(low.pressure);\r
- Amount<Pressure> lowToTarget = pressure.minus(low.pressure);\r
- Amount<Dimensionless> frac = lowToTarget.divide(lowToHigh).to(Dimensionless.UNIT);\r
- \r
- Amount<Velocity> vdiff = high.burnRate.minus(low.burnRate);\r
- Amount<Velocity> ret = low.burnRate.plus(vdiff.times(frac));\r
- \r
- if ( ret.isLessThan(ZERO_VELOCITY) )\r
- return ZERO_VELOCITY;\r
- \r
- return ret;\r
- \r
- }\r
- \r
- public void clear(){\r
- entries = new TreeMap<Amount<Pressure>, Entry>();\r
- add(Amount.valueOf(0,SI.MEGA(SI.PASCAL)), Amount.valueOf(0, SI.METERS_PER_SECOND));\r
- }\r
- \r
- @Override\r
- public double getCombustionEfficiency() {\r
- return combustionEfficiency;\r
- }\r
- \r
-\r
- public void setCombustionEfficiency(double combustionEfficiency) {\r
- this.combustionEfficiency = combustionEfficiency;\r
- }\r
- \r
- @Override\r
- public EditableCombustionProduct getCombustionProduct(){\r
- return product;\r
- }\r
- \r
- public void setCombustionProduct(final EditableCombustionProduct product){\r
- this.product = product;\r
- }\r
- \r
- @Override\r
- public double getDensityRatio() {\r
- return densityRatio;\r
- }\r
- \r
- public void setDensityRatio(double densityRatio) {\r
- this.densityRatio = densityRatio;\r
- }\r
-\r
- @Override\r
- public Amount<VolumetricDensity> getIdealDensity() {\r
- return density;\r
- }\r
- \r
- public void setIdealDensity(Amount<VolumetricDensity> density) {\r
- this.density = density;\r
- }\r
-\r
- @Override\r
- public String getName() {\r
- return name;\r
- }\r
- \r
- public void setName(String name) {\r
- this.name = name;\r
- }\r
-\r
- @Override\r
- public URI getURI() {\r
- return uri;\r
- }\r
-\r
-\r
- \r
- public Map<Amount<Pressure>, Amount<Velocity>> getEntries() {\r
- HashMap<Amount<Pressure>, Amount<Velocity>> ret = new HashMap<Amount<Pressure>, Amount<Velocity>>();\r
- for ( Entry e : entries.values() )\r
- ret.put(e.pressure, e.burnRate);\r
- return ret;\r
- }\r
- \r
- public void setEntries(Map<Amount<Pressure>, Amount<Velocity>> in) {\r
- clear();\r
- for ( Map.Entry<Amount<Pressure>, Amount<Velocity>> e : in.entrySet()){\r
- add( e.getKey(), e.getValue());\r
- }\r
- }\r
-\r
-\r
- \r
- public static void main( String args[]) throws Exception{\r
- PiecewiseLinearFuel f = new PiecewiseLinearFuel();\r
- f.add(Amount.valueOf(0,SI.MEGA(SI.PASCAL)), Amount.valueOf(2, SI.METERS_PER_SECOND));\r
- //f.add(Amount.valueOf(2,SI.MEGA(SI.PASCAL)), Amount.valueOf(2, SI.METERS_PER_SECOND));\r
- //f.add(Amount.valueOf(4,SI.MEGA(SI.PASCAL)), Amount.valueOf(1, SI.METERS_PER_SECOND));\r
- //f.add(Amount.valueOf(10,SI.MEGA(SI.PASCAL)), Amount.valueOf(3, SI.METERS_PER_SECOND));\r
- //f.add(Amount.valueOf(20,SI.MEGA(SI.PASCAL)), Amount.valueOf(4, SI.METERS_PER_SECOND));\r
- Chart<Pressure, Velocity> burnRate = new Chart<Pressure, Velocity>(\r
- SI.MEGA(SI.PASCAL),\r
- SI.METERS_PER_SECOND,\r
- f,\r
- "burnRate");\r
- burnRate.setDomain(\r
- burnRate.new IntervalDomain(\r
- Amount.valueOf(0, SI.MEGA(SI.PASCAL)),\r
- Amount.valueOf(11, SI.MEGA(SI.PASCAL)),\r
- 200\r
- ));\r
- \r
- burnRate.show();\r
- }\r
-}\r