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Unit test for multiple instances of rail buttons

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This commit is contained in:
JoePfeiffer 2023-03-14 21:37:17 -06:00
parent e9b7ff8249
commit 769ac69300
1 changed files with 54 additions and 0 deletions
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54
core/test/net/sf/openrocket/aerodynamics/BarrowmanCalculatorTest.java
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@ -20,6 +20,7 @@ import net.sf.openrocket.rocketcomponent.FlightConfiguration;
import net.sf.openrocket.rocketcomponent.NoseCone; import net.sf.openrocket.rocketcomponent.NoseCone;
import net.sf.openrocket.rocketcomponent.ParallelStage; import net.sf.openrocket.rocketcomponent.ParallelStage;
import net.sf.openrocket.rocketcomponent.PodSet; import net.sf.openrocket.rocketcomponent.PodSet;
import net.sf.openrocket.rocketcomponent.RailButton;
import net.sf.openrocket.rocketcomponent.Rocket; import net.sf.openrocket.rocketcomponent.Rocket;
import net.sf.openrocket.rocketcomponent.Transition; import net.sf.openrocket.rocketcomponent.Transition;
import net.sf.openrocket.rocketcomponent.TrapezoidFinSet; import net.sf.openrocket.rocketcomponent.TrapezoidFinSet;
@ -497,4 +498,57 @@ public class BarrowmanCalculatorTest {
assertEquals("should be warning from podset airframe overlap", 1, warnings.size()); assertEquals("should be warning from podset airframe overlap", 1, warnings.size());
} }
/**
* Tests railbutton drag. Really is testing instancing more than actual drag calculations
*/
@Test
public void testRailButtonDrag() {
// minimal rocket with nothing on it but two railbuttons
final Rocket rocket = new Rocket();
final AxialStage stage = new AxialStage();
rocket.addChild(stage);
// phantom tubes have no drag to confuse things
final BodyTube phantom = new BodyTube();
phantom.setOuterRadius(0);
stage.addChild(phantom);
// set up test environment
WarningSet warnings = new WarningSet();
final FlightConfiguration config = rocket.getSelectedConfiguration();
final FlightConditions conditions = new FlightConditions(config);
final BarrowmanCalculator calc = new BarrowmanCalculator();
// Put two individual railbuttons and get their CD
final RailButton button1 = new RailButton();
button1.setInstanceCount(1);
button1.setAxialOffset(1.0);
phantom.addChild(button1);
final RailButton button2 = new RailButton();
button2.setInstanceCount(1);
button2.setAxialOffset(2.0);
phantom.addChild(button2);
final AerodynamicForces individualForces = calc.getAerodynamicForces(config, conditions, warnings);
final double individualCD = individualForces.getCD();
// get rid of individual buttons and put in a railbutton set with two instances at same locations as original
// railbuttons
phantom.removeChild(button1);
phantom.removeChild(button2);
final RailButton buttons = new RailButton();
buttons.setInstanceCount(2);
buttons.setAxialOffset(1.0);
buttons.setInstanceSeparation(1.0);
final AerodynamicForces pairForces = calc.getAerodynamicForces(config, conditions, warnings);
final double pairCD = pairForces.getCD();
assertEquals("two individual railbuttons should have same CD as a pair", individualCD, pairCD, EPSILON);
} }
}