--- /dev/null
+package net.sf.openrocket.rocketcomponent;
+
+import static org.junit.Assert.assertEquals;
+import net.sf.openrocket.material.Material;
+import net.sf.openrocket.util.Coordinate;
+import net.sf.openrocket.util.BaseTestCase.BaseTestCase;
+
+import org.junit.Test;
+
+public class SymmetricComponentVolumeTest extends BaseTestCase {
+
+ @Test
+ public void simpleConeFilled() {
+ NoseCone nc = new NoseCone();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(1.0);
+ nc.setFilled(true);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setAftRadius(1.0);
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ double volume = Math.PI / 3.0;
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(0.75, cg.x, epsilonPercent * 0.75);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleConeWithShoulderFilled() {
+ NoseCone nc = new NoseCone();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(1.0);
+ nc.setFilled(true);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setAftRadius(1.0);
+ nc.setAftShoulderRadius(1.0);
+ nc.setAftShoulderLength(1.0);
+ nc.setAftShoulderThickness(1.0);
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ double volume = Math.PI / 3.0;
+ volume += Math.PI;
+
+ double mass = density * volume;
+
+ System.out.println(volume + "\t" + mass);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(1.312, cg.x, epsilonPercent * 1.071);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleConeHollow() {
+ NoseCone nc = new NoseCone();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(1.0);
+ nc.setAftRadius(1.0);
+ nc.setThickness(0.5);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ double volume = Math.PI / 3.0; // outer volume
+
+ // manually projected Thickness of 0.5 on to radius to determine
+ // the innerConeDimen. Since the outer cone is "square" (height = radius),
+ // we only need to compute this one dimension in order to compute the
+ // volume of the inner cone.
+ double innerConeDimen = 1.0 - Math.sqrt(2.0) / 2.0;
+ double innerVolume = Math.PI / 3.0 * innerConeDimen * innerConeDimen * innerConeDimen;
+ volume -= innerVolume;
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(0.7454, cg.x, epsilonPercent * 0.7454);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleConeWithShoulderHollow() {
+ NoseCone nc = new NoseCone();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(1.0);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setAftRadius(1.0);
+ nc.setThickness(0.5);
+ nc.setAftShoulderRadius(1.0);
+ nc.setAftShoulderLength(1.0);
+ nc.setAftShoulderThickness(0.5);
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ double volume = Math.PI / 3.0; // outer volume
+
+ // manually projected Thickness of 0.5 on to radius to determine
+ // the innerConeDimen. Since the outer cone is "square" (height = radius),
+ // we only need to compute this one dimension in order to compute the
+ // volume of the inner cone.
+ double innerConeDimen = 1.0 - Math.sqrt(2.0) / 2.0;
+ double innerVolume = Math.PI / 3.0 * innerConeDimen * innerConeDimen * innerConeDimen;
+ volume -= innerVolume;
+
+ volume += Math.PI - Math.PI * 0.5 * 0.5;
+
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(1.2719, cg.x, epsilonPercent * 1.2719);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleTransitionFilled() {
+ Transition nc = new Transition();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(4.0);
+ nc.setFilled(true);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setForeRadius(1.0);
+ nc.setAftRadius(2.0);
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ double volume = Math.PI / 3.0 * (2.0 * 2.0 + 2.0 * 1.0 + 1.0 * 1.0) * 4.0;
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(2.4285, cg.x, epsilonPercent * 2.4285);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleTransitionWithShouldersFilled() {
+ Transition nc = new Transition();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(4.0);
+ nc.setFilled(true);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setForeRadius(1.0);
+ nc.setAftRadius(2.0);
+ nc.setAftShoulderLength(1.0);
+ nc.setAftShoulderRadius(2.0);
+ nc.setAftShoulderThickness(2.0);
+ nc.setForeShoulderLength(1.0);
+ nc.setForeShoulderRadius(1.0);
+ nc.setForeShoulderThickness(1.0);
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ double volume = Math.PI / 3.0 * (2.0 * 2.0 + 2.0 * 1.0 + 1.0 * 1.0) * 4.0;
+ // plus aft shoulder:
+ volume += Math.PI * 1.0 * 2.0 * 2.0;
+ // plus fore shoulder:
+ volume += Math.PI * 1.0 * 1.0 * 1.0;
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(2.8023, cg.x, epsilonPercent * 2.8023);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleTransitionHollow1() {
+ Transition nc = new Transition();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(1.0);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setForeRadius(0.5);
+ nc.setAftRadius(1.0);
+ nc.setThickness(0.5);
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ // Volume of filled transition =
+ double filledVolume = Math.PI / 3.0 * (1.0 * 1.0 + 1.0 * 0.5 + 0.5 * 0.5) * 1.0;
+
+ // magic 2D cad drawing...
+ //
+ // Since the thickness >= fore radius, the
+ // hollowed out portion of the transition
+ // forms a cone.
+ // the dimensions of this cone were determined
+ // using a 2d cad tool.
+
+ double innerConeRadius = 0.441;
+ double innerConeLength = 0.882;
+ double innerVolume = Math.PI / 3.0 * innerConeLength * innerConeRadius * innerConeRadius;
+
+ double volume = filledVolume - innerVolume;
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(0.5884, cg.x, epsilonPercent * 0.5884);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleTransitionWithShouldersHollow1() {
+ Transition nc = new Transition();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(1.0);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setForeRadius(0.5);
+ nc.setAftRadius(1.0);
+ nc.setThickness(0.5);
+ nc.setAftShoulderLength(1.0);
+ nc.setAftShoulderRadius(1.0);
+ nc.setAftShoulderThickness(0.5);
+ nc.setForeShoulderLength(1.0);
+ nc.setForeShoulderRadius(0.5);
+ nc.setForeShoulderThickness(0.5); // note this means fore shoulder is filled.
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ // Volume of filled transition =
+ double filledVolume = Math.PI / 3.0 * (1.0 * 1.0 + 1.0 * 0.5 + 0.5 * 0.5) * 1.0;
+
+ // magic 2D cad drawing...
+ //
+ // Since the thickness >= fore radius, the
+ // hollowed out portion of the transition
+ // forms a cone.
+ // the dimensions of this cone were determined
+ // using a 2d cad tool.
+
+ double innerConeRadius = 0.441;
+ double innerConeLength = 0.882;
+ double innerVolume = Math.PI / 3.0 * innerConeLength * innerConeRadius * innerConeRadius;
+
+ double volume = filledVolume - innerVolume;
+
+ // Now add aft shoulder
+ volume += Math.PI * 1.0 * 1.0 * 1.0 - Math.PI * 1.0 * 0.5 * 0.5;
+ // Now add fore shoulder
+ volume += Math.PI * 1.0 * 0.5 * 0.5;
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(0.8581, cg.x, epsilonPercent * 0.8581);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleTransitionHollow2() {
+ Transition nc = new Transition();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(1.0);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setForeRadius(0.5);
+ nc.setAftRadius(1.0);
+ nc.setThickness(0.25);
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ // Volume of filled transition =
+ double filledVolume = Math.PI / 3.0 * (1.0 * 1.0 + 1.0 * 0.5 + 0.5 * 0.5) * 1.0;
+
+ // magic 2D cad drawing...
+ //
+ // Since the thickness < fore radius, the
+ // hollowed out portion of the transition
+ // forms a transition.
+ // the dimensions of this transition were determined
+ // using a 2d cad tool.
+
+ double innerTransitionAftRadius = 0.7205;
+ double innerTransitionForeRadius = 0.2205;
+ double innerVolume = Math.PI / 3.0
+ * (innerTransitionAftRadius * innerTransitionAftRadius + innerTransitionAftRadius * innerTransitionForeRadius + innerTransitionForeRadius * innerTransitionForeRadius);
+
+ double volume = filledVolume - innerVolume;
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(0.56827, cg.x, epsilonPercent * 0.56827);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+ @Test
+ public void simpleTransitionWithShouldersHollow2() {
+ Transition nc = new Transition();
+
+ final double epsilonPercent = 0.001;
+ final double density = 2.0;
+
+ nc.setLength(1.0);
+ nc.setType(Transition.Shape.CONICAL);
+ nc.setForeRadius(0.5);
+ nc.setAftRadius(1.0);
+ nc.setThickness(0.25);
+ nc.setAftShoulderLength(1.0);
+ nc.setAftShoulderRadius(1.0);
+ nc.setAftShoulderThickness(0.25);
+ nc.setForeShoulderLength(1.0);
+ nc.setForeShoulderRadius(0.5);
+ nc.setForeShoulderThickness(0.25);
+
+ nc.setMaterial(Material.newMaterial(Material.Type.BULK, "test", density, true));
+
+ Coordinate cg = nc.getCG();
+
+ System.out.println(nc.getComponentVolume() + "\t" + nc.getMass());
+ System.out.println(cg);
+
+ // Volume of filled transition =
+ double filledVolume = Math.PI / 3.0 * (1.0 * 1.0 + 1.0 * 0.5 + 0.5 * 0.5) * 1.0;
+
+ // magic 2D cad drawing...
+ //
+ // Since the thickness < fore radius, the
+ // hollowed out portion of the transition
+ // forms a transition.
+ // the dimensions of this transition were determined
+ // using a 2d cad tool.
+
+ double innerTransitionAftRadius = 0.7205;
+ double innerTransitionForeRadius = 0.2205;
+ double innerVolume = Math.PI / 3.0
+ * (innerTransitionAftRadius * innerTransitionAftRadius + innerTransitionAftRadius * innerTransitionForeRadius + innerTransitionForeRadius * innerTransitionForeRadius);
+
+ double volume = filledVolume - innerVolume;
+
+ // now add aft shoulder
+ volume += Math.PI * 1.0 * 1.0 * 1.0 - Math.PI * 1.0 * 0.75 * 0.75;
+ // now add fore shoulder
+ volume += Math.PI * 1.0 * 0.5 * 0.5 - Math.PI * 1.0 * 0.25 * 0.25;
+
+
+ double mass = density * volume;
+
+ System.out.println(volume);
+
+ assertEquals(volume, nc.getComponentVolume(), epsilonPercent * volume);
+ assertEquals(mass, nc.getMass(), epsilonPercent * mass);
+
+ assertEquals(0.7829, cg.x, epsilonPercent * 0.7829);
+ assertEquals(mass, cg.weight, epsilonPercent * mass);
+ }
+
+}
projects / debian / openrocket / blobdiff