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[fixes #755] Correctly calculate cg.x override

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This commit is contained in:
Daniel_M_Williams 2020-09-01 19:55:13 -04:00
parent 86b0b0fcbd
commit 5b94bedb5f
3 changed files with 99 additions and 22 deletions
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31
core/src/net/sf/openrocket/masscalc/MassCalculation.java
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@ -341,6 +341,17 @@ public class MassCalculation {
// mass data for *this component only* in the rocket-frame
compCM = parentTransform.transform( compCM.add(component.getPosition()) );
if (component.getOverrideSubcomponents()) {
if (component.isMassOverridden()) {
double newMass = MathUtil.max(component.getOverrideMass(), MIN_MASS);
Coordinate newCM = this.getCM().setWeight( newMass );
this.setCM( newCM );
}
if (component.isCGOverridden()) {
this.setCM( this.getCM().setX( compCM.x + component.getOverrideCGX()));
}
}
this.addMass( compCM );
if(null != analysisMap){
@ -357,28 +368,14 @@ public class MassCalculation {
}
}
double compIx = component.getRotationalUnitInertia() * compCM.weight;
double compIt = component.getLongitudinalUnitInertia() * compCM.weight;
RigidBody componentInertia = new RigidBody( compCM, compIx, compIt, compIt );
final double compIx = component.getRotationalUnitInertia() * compCM.weight;
final double compIt = component.getLongitudinalUnitInertia() * compCM.weight;
final RigidBody componentInertia = new RigidBody( compCM, compIx, compIt, compIt );
this.addInertia( componentInertia );
// // vvv DEBUG
// if( 0 < compCM.weight ) {
// System.err.println(String.format( "%s....componentData: %s", prefix, compCM.toPreciseString() ));
// }
if (component.getOverrideSubcomponents()) {
if (component.isMassOverridden()) {
double newMass = MathUtil.max(component.getOverrideMass(), MIN_MASS);
Coordinate newCM = this.getCM().setWeight( newMass );
this.setCM( newCM );
}
if (component.isCGOverridden()) {
Coordinate newCM = this.getCM().setX( component.getOverrideCGX() );
this.setCM( newCM );
}
}
}
// // vvv DEBUG

35
core/src/net/sf/openrocket/util/TestRockets.java
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@ -638,6 +638,41 @@ public class TestRockets {
return rocket;
}
// This is not a production rocket -- it is construction, purely for testing Mass Overrides
// This function is used for unit, integration tests, DO NOT CHANGE (without updating tests).
public static final Rocket makeSimple2Stage(){
Rocket rocket = new Rocket();
rocket.createFlightConfiguration( TEST_FCID_0 );
rocket.setName("Simple 2-Stage Rocket");
final double bodytubeLength = 0.10;
final double bodytubeRadius = 0.01;
final double bodytubeThickness = 0.001;
{
final AxialStage sustainerStage = new AxialStage();
sustainerStage.setName("Sustainer Stage");
rocket.addChild(sustainerStage);
final BodyTube bodytube = new BodyTube(bodytubeLength, bodytubeRadius, bodytubeThickness);
bodytube.setName("Sustainer Body Tube");
sustainerStage.addChild(bodytube);
}{
final AxialStage boosterStage = new AxialStage();
boosterStage.setName("Booster Stage");
rocket.addChild(boosterStage);
final BodyTube boosterBody = new BodyTube(bodytubeLength, bodytubeRadius, bodytubeThickness);
boosterBody.setName("Booster Body Tube");
boosterStage.addChild(boosterBody);
}
rocket.setSelectedConfiguration( TEST_FCID_0 );
rocket.getSelectedConfiguration().setAllStages();
rocket.enableEvents();
return rocket;
}
public static Rocket makeBigBlue() {
Rocket rocket;
AxialStage stage;

55
core/test/net/sf/openrocket/masscalc/MassCalculatorTest.java
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@ -22,7 +22,6 @@ public class MassCalculatorTest extends BaseTestCase {
@Test
public void testAlphaIIIStructure() {
System.err.println("testing AlphaIII structure");
Rocket rocket = TestRockets.makeEstesAlphaIII();
rocket.setName("AlphaIII." + Thread.currentThread().getStackTrace()[1].getMethodName());
@ -54,7 +53,6 @@ public class MassCalculatorTest extends BaseTestCase {
assertEquals("Alpha III Longitudinal MOI calculated incorrectly: ", expMOIlong, actualMOIlong, EPSILON);
// if we use a mass override, setting to same mass, we should get same result
System.err.println("calculating AlphaIII with mass override");
AxialStage sustainer = (AxialStage) rocket.getChild(0);
sustainer.setOverrideSubcomponents(true);
@ -160,7 +158,54 @@ public class MassCalculatorTest extends BaseTestCase {
assertEquals(" Motor Mass " + desig + " is incorrect: ", expMass, actualMotorData.getMass(), EPSILON);
}
}
@Test
public void testStageOverride() {
final Rocket rocket = TestRockets.makeSimple2Stage();
final AxialStage sustainerStage = (AxialStage) rocket.getChild(0);
final AxialStage boosterStage = (AxialStage) rocket.getChild(1);
final FlightConfiguration config = rocket.getSelectedConfiguration();
{ // [0] verify / document structure
final BodyTube sustainerBody = (BodyTube) sustainerStage.getChild(0);
assertEquals(0.0, sustainerBody.getPosition().x, EPSILON);
assertEquals(0.1, sustainerBody.getLength(), EPSILON);
final BodyTube boosterBody = (BodyTube) boosterStage.getChild(0);
assertEquals(0.10, boosterBody.getComponentLocations()[0].x, EPSILON);
assertEquals(0.10, boosterBody.getLength(), EPSILON);
}
{ // [1] test Rocket CM, before:
final RigidBody actualStructure = MassCalculator.calculateStructure(config);
final double actualRocketDryMass = actualStructure.cm.weight;
final double expRocketDryMass = 0.0081178754;
assertEquals(" Alpha III Empty Mass is incorrect: ", expRocketDryMass, actualRocketDryMass, EPSILON);
final Coordinate actualRocketDryCM = actualStructure.cm;
final double expCMx = 0.10;
assertEquals("Simple Rocket CM.x is incorrect: ", expCMx, actualRocketDryCM.x, EPSILON);
}
boosterStage.setOverrideSubcomponents(true);
boosterStage.setCGOverridden(true);
boosterStage.setOverrideCGX(0.0);
{ // [1] test Rocket CM, before:
final RigidBody actualStructure = MassCalculator.calculateStructure(config);
final double actualRocketDryMass = actualStructure.cm.weight;
final double expRocketDryMass = 0.0081178754;
assertEquals(" Alpha III Empty Mass is incorrect: ", expRocketDryMass, actualRocketDryMass, EPSILON);
final Coordinate actualRocketDryCM = actualStructure.cm;
final double expCMx = 0.075;
assertEquals("Simple Rocket CM.x is incorrect: ", expCMx, actualRocketDryCM.x, EPSILON);
}
}
@Test
public void testFalcon9HComponentMasses() {
Rocket rkt = TestRockets.makeFalcon9Heavy();
@ -723,7 +768,7 @@ public class MassCalculatorTest extends BaseTestCase {
double expTotalMass = overrideMass;
assertEquals(" Booster Launch Mass is incorrect: ", expTotalMass, calcTotalMass, EPSILON);
double expCMx = 6.0;
double expCMx = 6.484;
Coordinate expCM = new Coordinate(expCMx, 0, 0, expTotalMass);
assertEquals(" Booster Launch CM.x is incorrect: ", expCM.x, boosterSetCM.x, EPSILON);
assertEquals(" Booster Launch CM.y is incorrect: ", expCM.y, boosterSetCM.y, EPSILON);
@ -735,7 +780,7 @@ public class MassCalculatorTest extends BaseTestCase {
double boosterMOI_xx = burnout.getRotationalInertia();
assertEquals(" Booster x-axis MOI is incorrect: ", expMOI_axial, boosterMOI_xx, EPSILON);
double expMOI_tr = 14.815925423036177;
double expMOI_tr = 17.86133586701;
double boosterMOI_tr = burnout.getLongitudinalInertia();
assertEquals(" Booster transverse MOI is incorrect: ", expMOI_tr, boosterMOI_tr, EPSILON);
}