X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fcom%2Fbillkuker%2Frocketry%2Fmotorsim%2FBurn.java;h=0416d1ec0892a087710627ceb61555854534f99c;hb=6a3d94f706ba306d48d96cbad16c3bd3004e2c6e;hp=c528333185343c2ab80ddf8ab910b8e5ec6a4142;hpb=894eb7769f520a07e67c4ababe4e71fc650fbf57;p=sw%2Fmotorsim diff --git a/src/com/billkuker/rocketry/motorsim/Burn.java b/src/com/billkuker/rocketry/motorsim/Burn.java index c528333..0416d1e 100644 --- a/src/com/billkuker/rocketry/motorsim/Burn.java +++ b/src/com/billkuker/rocketry/motorsim/Burn.java @@ -3,6 +3,8 @@ package com.billkuker.rocketry.motorsim; import java.util.Date; +import java.util.HashSet; +import java.util.Set; import java.util.SortedMap; import java.util.TreeMap; @@ -25,17 +27,85 @@ import org.apache.log4j.Logger; import org.jscience.physics.amount.Amount; import org.jscience.physics.amount.Constants; +import com.billkuker.rocketry.motorsim.Validating.ValidationException; + public class Burn { - //Some constants to tune adaptive regression step - private static final double regStepIncreaseFactor = 1.01; - private static final double regStepDecreaseFactor = .5; - private static final Amount chamberPressureMaxDelta = Amount.valueOf(.5, SI.MEGA(SI.PASCAL)); - private static Logger log = Logger.getLogger(Burn.class); + + private static final BurnSettings settings = new BurnSettings(); + public static final BurnSettings getBurnSettings(){ + return settings; + } + + /** + * A class representing all the settigns one can change on a burn + * @author bkuker + */ + public static class BurnSettings { + private BurnSettings(){}; + + public enum BurnVolumeMethod { + DeltaVolume, + SurfaceTimesRegression; + } + + private BurnVolumeMethod volumeMethod = BurnVolumeMethod.SurfaceTimesRegression; + private double regStepIncreaseFactor = 1.01; + private double regStepDecreaseFactor = .5; + private Amount chamberPressureMaxDelta = Amount.valueOf(.5, SI.MEGA(SI.PASCAL)); + private Amount endPressure = Amount.valueOf(.1, RocketScience.PSI); + private Amount atmosphereicPressure = Amount.valueOf(101000, SI.PASCAL); + + public void setVolumeMethod(BurnVolumeMethod volumeMethod) { + this.volumeMethod = volumeMethod; + } + public BurnVolumeMethod getVolumeMethod() { + return volumeMethod; + } + public double getRegStepIncreaseFactor() { + return regStepIncreaseFactor; + } + public void setRegStepIncreaseFactor(double regStepIncreaseFactor) { + this.regStepIncreaseFactor = regStepIncreaseFactor; + } + public double getRegStepDecreaseFactor() { + return regStepDecreaseFactor; + } + public void setRegStepDecreaseFactor(double regStepDecreaseFactor) { + this.regStepDecreaseFactor = regStepDecreaseFactor; + } + public Amount getChamberPressureMaxDelta() { + return chamberPressureMaxDelta; + } + public void setChamberPressureMaxDelta(Amount chamberPressureMaxDelta) { + this.chamberPressureMaxDelta = chamberPressureMaxDelta; + } + public Amount getEndPressure() { + return endPressure; + } + public void setEndPressure(Amount endPressure) { + this.endPressure = endPressure; + } + public Amount getAtmosphereicPressure() { + return atmosphereicPressure; + } + public void setAtmosphereicPressure(Amount atmosphereicPressure) { + this.atmosphereicPressure = atmosphereicPressure; + } + } + protected final Motor motor; - private static final Amount atmosphereicPressure = Amount.valueOf(101000, SI.PASCAL); + private boolean burning = false; + private boolean done = false; + public interface BurnProgressListener{ + public void setProgress(float p); + public void burnComplete(); + } + + private Set bpls = new HashSet(); + public class Interval{ public Amount time; public Amount dt; @@ -52,6 +122,8 @@ public class Burn { protected SortedMap,Interval> data = new TreeMap, Interval>(); public SortedMap,Interval> getData(){ + if ( !done ) + throw new IllegalStateException("Burn not complete!"); return data; } @@ -60,16 +132,36 @@ public class Burn { } public Amount burnTime(){ - return data.lastKey(); + return getData().lastKey(); } public Burn(Motor m){ + try { + m.validate(); + } catch (ValidationException e) { + throw new IllegalArgumentException("Invalid Motor: " + e.getMessage()); + } motor = m; - burn(); } - private void burn(){ + public void addBurnProgressListener( BurnProgressListener bpl ){ + bpls.add(bpl); + if ( done ) + bpl.burnComplete(); + } + + public void burn(){ + synchronized(this){ + if ( burning ) + throw new IllegalStateException("Already burning!"); + burning = true; + } log.info("Starting burn..."); + for (BurnProgressListener bpl : bpls ){ + bpl.setProgress(0); + } + + int endPressureSteps = 0; long start = new Date().getTime(); Amount regStep = Amount.valueOf(0.01, SI.MILLIMETER); @@ -78,7 +170,7 @@ public class Burn { initial.time = Amount.valueOf(0, SI.SECOND); initial.dt = Amount.valueOf(0, SI.SECOND); initial.regression = Amount.valueOf(0, SI.MILLIMETER); - initial.chamberPressure = atmosphereicPressure; + initial.chamberPressure = settings.getAtmosphereicPressure(); initial.chamberProduct = Amount.valueOf(0, SI.KILOGRAM); initial.thrust = Amount.valueOf(0, SI.NEWTON); @@ -87,7 +179,7 @@ public class Burn { step: for ( int i = 0; i < 5000; i++ ) { assert(positive(regStep)); - regStep = regStep.times(regStepIncreaseFactor); + regStep = regStep.times(settings.getRegStepIncreaseFactor()); Interval prev = data.get(data.lastKey()); log.debug(prev); @@ -112,14 +204,25 @@ public class Burn { log.debug("Regression: " + next.regression); + //Update BurnProgressListeners + Amount a = next.regression.divide(motor.getGrain().webThickness()).to(Dimensionless.UNIT); + for (BurnProgressListener bpl : bpls ){ + bpl.setProgress((float)a.doubleValue(Dimensionless.UNIT)); + } + + next.time = prev.time.plus(dt); //log.debug("Vold: " + motor.getGrain().volume(prev.regression).to(SI.MILLIMETER.pow(3))); //log.debug("Vnew: " + motor.getGrain().volume(next.regression).to(SI.MILLIMETER.pow(3))); - //TODO Amount volumeBurnt = motor.getGrain().volume(prev.regression).minus(motor.getGrain().volume(next.regression)); - Amount volumeBurnt = motor.getGrain().surfaceArea(prev.regression).times(regStep).to(Volume.UNIT); + Amount volumeBurnt; + if ( settings.getVolumeMethod() == BurnSettings.BurnVolumeMethod.DeltaVolume ){ + volumeBurnt = motor.getGrain().volume(prev.regression).minus(motor.getGrain().volume(next.regression)); + } else { + volumeBurnt = motor.getGrain().surfaceArea(prev.regression).times(regStep).to(Volume.UNIT); + } assert(positive(volumeBurnt)); //log.info("Volume Burnt: " + volumeBurnt.to(SI.MILLIMETER.pow(3))); @@ -129,7 +232,7 @@ public class Burn { //log.debug("Mass Gen Rate: " + mGenRate); //Calculate specific gas constant - Amount specificGasConstant = Constants.R.divide(motor.getFuel().getCombustionProduct().getEffectiveMolarWeight()); + Amount specificGasConstant = Constants.R.divide(motor.getFuel().getCombustionProduct().getEffectiveMolarWeight()); //This unit conversion helps JScience to convert nozzle flow rate to //kg/s a little later on I verified the conversion by hand and //JScience checks it too. @@ -140,12 +243,12 @@ public class Burn { Amount mNozzle; { - Amount pDiff = prev.chamberPressure.minus(atmosphereicPressure); + Amount pDiff = prev.chamberPressure.minus(settings.getAtmosphereicPressure()); //log.debug("Pdiff: " + pDiff); Amount aStar = motor.getNozzle().throatArea(); double k = motor.getFuel().getCombustionProduct().getRatioOfSpecificHeats(); double kSide = Math.sqrt(k) * Math.pow((2/(k+1)) , (((k+1)/2)/(k-1))); - Amount sqrtPart = specificGasConstant.times(chamberTemp).sqrt(); + Amount sqrtPart = specificGasConstant.times(chamberTemp).sqrt(); mNozzle = pDiff.times(aStar).times(kSide).divide(sqrtPart).to(MassFlowRate.UNIT); //log.debug("Mass Exit Rate: " + mNozzle.to(MassFlowRate.UNIT)); } @@ -160,7 +263,7 @@ public class Burn { //Product can not go negative! if ( !positive(next.chamberProduct) ){ log.warn("ChamberProduct Negative on step " + i + "!, Adjusting regstep down and repeating step!"); - regStep = regStep.times(regStepDecreaseFactor); + regStep = regStep.times(settings.getRegStepDecreaseFactor()); continue step; } assert(positive(next.chamberProduct)); @@ -173,7 +276,7 @@ public class Burn { log.debug("Product Density: " + combustionProductDensity); - next.chamberPressure = combustionProductDensity.times(specificGasConstant).times(chamberTemp).plus(atmosphereicPressure).to(Pressure.UNIT); + next.chamberPressure = combustionProductDensity.times(specificGasConstant).times(chamberTemp).plus(settings.getAtmosphereicPressure()).to(Pressure.UNIT); assert(positive(next.chamberPressure)); next.chamberPressure = Amount.valueOf( @@ -181,18 +284,20 @@ public class Burn { SI.PASCAL); Amount dp = next.chamberPressure.minus(prev.chamberPressure); - if ( dp.abs().isGreaterThan(chamberPressureMaxDelta)){ + if ( dp.abs().isGreaterThan(settings.getChamberPressureMaxDelta())){ log.warn("DP " + dp + " too big!, Adjusting regstep down and repeating step!"); - regStep = regStep.times(regStepDecreaseFactor); + regStep = regStep.times(settings.getRegStepDecreaseFactor()); continue step; } - next.thrust = motor.getNozzle().thrust(next.chamberPressure, atmosphereicPressure, atmosphereicPressure, motor.getFuel().getCombustionProduct().getRatioOfSpecificHeats2Phase()); + next.thrust = motor.getNozzle().thrust(next.chamberPressure, settings.getAtmosphereicPressure(), settings.getAtmosphereicPressure(), motor.getFuel().getCombustionProduct().getRatioOfSpecificHeats2Phase()); assert(positive(next.thrust)); - if ( i > 100 && next.chamberPressure.approximates(atmosphereicPressure)){ - log.info("Pressure at Patm on step " + i); - break; + if ( i > 100 && next.chamberPressure.minus(settings.getAtmosphereicPressure()).abs().isLessThan(settings.getEndPressure())){ + log.info("Pressure at ~Patm on step " + i); + endPressureSteps++; + if ( endPressureSteps > 5 ) + break; } data.put(data.lastKey().plus(dt), next); @@ -200,6 +305,10 @@ public class Burn { long time = new Date().getTime() - start; log.info("Burn took " + time + " millis."); + done = true; + for (BurnProgressListener bpl : bpls ){ + bpl.burnComplete(); + } } @SuppressWarnings("unchecked") @@ -214,11 +323,11 @@ public class Burn { } public Amount pressure(Amount time){ - return data.get(time).chamberPressure; + return getData().get(time).chamberPressure; } public Amount thrust(Amount time){ - return data.get(time).thrust; + return getData().get(time).thrust; } public Amount kn(Amount regression){