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[fix] Adds 4-fin splits to unittests

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Daniel_M_Williams 2020-03-22 17:14:28 -04:00 committed by Daniel Williams
parent b8172305f8
commit b24184afc7
4 changed files with 77 additions and 19 deletions
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14
core/src/net/sf/openrocket/aerodynamics/BarrowmanCalculator.java
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@ -180,9 +180,11 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
}
final InstanceMap imap = configuration.getActiveInstances();
final AerodynamicForces assemblyForces= new AerodynamicForces().zero();
// System.err.println("======================================");
// System.err.println("==== Iterating through components ====");
// iterate through all components
for(Map.Entry<RocketComponent, ArrayList<InstanceContext>> entry: imap.entrySet() ) {
final RocketComponent comp = entry.getKey();
@ -192,8 +194,11 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
if (null != calcObj) {
// iterate across component instances
final ArrayList<InstanceContext> contextList = entry.getValue();
for(InstanceContext context: contextList ) {
AerodynamicForces instanceForces = new AerodynamicForces().zero();
// System.err.println(String.format("@ [%s]:[%d/%d]", comp.getName(), context.instanceNumber + 1, comp.getInstanceCount()));
// System.err.println("_________ inst/ctxt: xrotation: " + context.transform.getXrotation());
calcObj.calculateNonaxialForces(conditions, context.transform, instanceForces, warnings);
@ -202,14 +207,21 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
if ((comp instanceof FinSet) && (((FinSet)comp).getFinCount() > 2))
cp_abs = cp_abs.setY(0.0).setZ(0.0);
// if( 1e-6 < cp_inst.weight) {
// System.err.println("_________ cp:inst: (rel): " + cp_inst.toString());
// System.err.println("_________ cp:inst: (abs): " + cp_abs.toString());
// }
instanceForces.setCP(cp_abs);
double CN_instanced = instanceForces.getCN();
instanceForces.setCm(CN_instanced * instanceForces.getCP().x / conditions.getRefLength());
assemblyForces.merge(instanceForces);
}
}
}
// System.err.println("____ cp:asbly: " + assemblyForces.getCP().toString());
return assemblyForces;
}

9
core/src/net/sf/openrocket/aerodynamics/barrowman/FinSetCalc.java
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@ -49,7 +49,6 @@ public class FinSetCalc extends RocketComponentCalc {
private final double thickness;
private final double bodyRadius;
private final int finCount;
private final double baseRotation;
private final double cantAngle;
private final FinSet.CrossSection crossSection;
@ -68,7 +67,6 @@ public class FinSetCalc extends RocketComponentCalc {
bodyRadius = fin.getBodyRadius();
finCount = fin.getFinCount();
baseRotation = fin.getBaseRotation();
cantAngle = fin.getCantAngle();
span = fin.getSpan();
finArea = fin.getPlanformArea();
@ -114,10 +112,12 @@ public class FinSetCalc extends RocketComponentCalc {
// Multiple fins with fin-fin interference
double cna;
double theta = conditions.getTheta();
double angle = baseRotation + transform.getXrotation();
double angle = transform.getXrotation();
// Compute basic CNa without interference effects
cna = cna1 * MathUtil.pow2(Math.sin(theta - angle));
// final double cna_x = cna1 * MathUtil.pow2(Math.sin(theta - angle));
// final double cna_y = cna1 * MathUtil.pow2(Math.sin(theta - angle));
// logger.debug("Component cna = {}", cna);
@ -166,7 +166,6 @@ public class FinSetCalc extends RocketComponentCalc {
// (Barrowman thesis pdf-page 40)
// TODO: LOW: fin-fin mach cone effect, MIL-HDBK page 5-25
// Calculate CP position
double x = macLead + calculateCPPos(conditions) * macLength;
// logger.debug("Component macLead = {}", macLead);

6
core/src/net/sf/openrocket/util/TestRockets.java
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@ -1036,12 +1036,6 @@ public class TestRockets {
boosterFins.setSweep(0.18);
boosterFins.setAxialMethod(AxialMethod.BOTTOM);
boosterFins.setAxialOffset(0.0);
// cp:(1.17873,0.10422,0.02722,w=6.07405) (1 fin case)
// cp:(1.17873,-0.10422,-0.02722,w=6.07405) (1 fin case)
// cp:(1.17873,0.10422,0.02722,w=12.14810) (2 fin case)
// cp:(1.17873,-0.10422,-0.02722,w=12.14810) (2 fin case)
// cp:(1.17873,0.00000,0.00000,w=9.11107) (3 fin case)
// cp:(1.17873,0.00000,0.00000,w=9.11107) (3 fin case)
}
}

67
core/test/net/sf/openrocket/aerodynamics/BarrowmanCalculatorTest.java
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@ -130,22 +130,51 @@ public class BarrowmanCalculatorTest {
}{
boosterFins.setFinCount(2);
final Coordinate cp_2fin = calc.getCP(config, conditions, warnings);
assertEquals(" Falcon 9 Heavy CNa value is incorrect:", 27.585207667168696, cp_2fin.weight, EPSILON);
assertEquals(" Falcon 9 Heavy CP x value is incorrect:", 1.0757127676940474, cp_2fin.x, EPSILON);
assertEquals(" Falcon 9 Heavy CNa value is incorrect:", 15.43711196967902, cp_2fin.weight, EPSILON);
assertEquals(" Falcon 9 Heavy CP x value is incorrect:", 0.9946423753010524, cp_2fin.x, EPSILON);
assertEquals(" Falcon 9 Heavy CP y value is incorrect:", 0.0, cp_2fin.y, EPSILON);
assertEquals(" Falcon 9 Heavy CP z value is incorrect:", 0.0, cp_2fin.z, EPSILON);
}{
boosterFins.setFinCount(1);
final Coordinate cp_1fin = calc.getCP(config, conditions, warnings);
assertEquals(" Falcon 9 Heavy CNa value is incorrect:", 15.43711196967902, cp_1fin.weight, EPSILON);
assertEquals(" Falcon 9 Heavy CP x value is incorrect:", 0.99464, cp_1fin.x, EPSILON);
assertEquals(" Falcon 9 Heavy CNa value is incorrect:", 9.36306412, cp_1fin.weight, EPSILON);
assertEquals(" Falcon 9 Heavy CP x value is incorrect:", 0.87521867, cp_1fin.x, EPSILON);
assertEquals(" Falcon 9 Heavy CP y value is incorrect:", 0f, cp_1fin.y, EPSILON);
assertEquals(" Falcon 9 Heavy CP z value is incorrect:", 0f, cp_1fin.z, EPSILON);
}{
// absent -- 3.28901627g @[0.31469937,0.05133333,0.00000000]
}
}
@Test
public void testFinCountEffect() {
final BarrowmanCalculator calc = new BarrowmanCalculator();
final WarningSet warnings = new WarningSet();
final Rocket rocket = TestRockets.makeEstesAlphaIII();
final FlightConfiguration config = rocket.getSelectedConfiguration();
final FlightConditions conditions = new FlightConditions(config);
{
((FinSet)rocket.getChild(0).getChild(1).getChild(0)).setFinCount(4);
final Coordinate wholeRocketCP = calc.getCP(config, conditions, warnings);
assertEquals("Split-Fin Rocket CNa value is incorrect:", 34.19591165, wholeRocketCP.weight, EPSILON);
assertEquals("Split-Fin Rocket CP x value is incorrect:", 0.22724216, wholeRocketCP.x, EPSILON);
}{
((FinSet)rocket.getChild(0).getChild(1).getChild(0)).setFinCount(3);
final Coordinate wholeRocketCP = calc.getCP(config, conditions, warnings);
assertEquals("Split-Fin Rocket CNa value is incorrect:", 26.14693374, wholeRocketCP.weight, EPSILON);
assertEquals("Split-Fin Rocket CP x value is incorrect:", 0.22351541, wholeRocketCP.x, EPSILON);
}{
((FinSet)rocket.getChild(0).getChild(1).getChild(0)).setFinCount(2);
final Coordinate wholeRocketCP = calc.getCP(config, conditions, warnings);
assertEquals("Split-Fin Rocket CNa value is incorrect:", 2.0, wholeRocketCP.weight, EPSILON);
assertEquals("Split-Fin Rocket CP x value is incorrect:", 0.032356, wholeRocketCP.x, EPSILON);
}{
((FinSet)rocket.getChild(0).getChild(1).getChild(0)).setFinCount(1);
final Coordinate wholeRocketCP = calc.getCP(config, conditions, warnings);
assertEquals("Split-Fin Rocket CNa value is incorrect:", 2.0, wholeRocketCP.weight, EPSILON);
assertEquals("Split-Fin Rocket CP x value is incorrect:", 0.032356, wholeRocketCP.x, EPSILON);
}
}
@Test
public void testCpSplitTripleFin() {
final BarrowmanCalculator calc = new BarrowmanCalculator();
@ -164,13 +193,37 @@ public class BarrowmanCalculatorTest {
final FinSet fins = (FinSet)body.getChild(0);
fins.setAngleOffset(0);
TestRockets.splitRocketFins(body, fins, 3);
final Coordinate wholeRocketCP = calc.getCP(config, conditions, warnings);
assertEquals("Split-Fin Rocket CNa value is incorrect:", 26.14693374, wholeRocketCP.weight, EPSILON);
assertEquals("Split-Fin Rocket CP x value is incorrect:", 0.22351541, wholeRocketCP.x, EPSILON);
}
}
@Test
public void testCpSplitQuadrupleFin() {
final BarrowmanCalculator calc = new BarrowmanCalculator();
final WarningSet warnings = new WarningSet();
final Rocket rocket = TestRockets.makeEstesAlphaIII();
final FlightConfiguration config = rocket.getSelectedConfiguration();
final FlightConditions conditions = new FlightConditions(config);
{
((FinSet)rocket.getChild(0).getChild(1).getChild(0)).setFinCount(4);
final Coordinate wholeRocketCP = calc.getCP(config, conditions, warnings);
assertEquals("Split-Fin Rocket CNa value is incorrect:", 34.19591165, wholeRocketCP.weight, EPSILON);
assertEquals("Split-Fin Rocket CP x value is incorrect:", 0.22724, wholeRocketCP.x, EPSILON);
}{
final BodyTube body = (BodyTube)rocket.getChild(0).getChild(1);
final FinSet fins = (FinSet)body.getChild(0);
TestRockets.splitRocketFins(body, fins, 4);
final Coordinate wholeRocketCP = calc.getCP(config, conditions, warnings);
assertEquals("Split-Fin Rocket CNa value is incorrect:", 34.19591165, wholeRocketCP.weight, EPSILON);
assertEquals("Split-Fin Rocket CP x value is incorrect:", 0.22724, wholeRocketCP.x, EPSILON);
}
}
// test rocket with endplates on fins. Comments tracing
// calculation of CP are in TestRockets.makeEndPlateRocket().
@Test