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Change the implementation of Transition getComponentVolume to include the volumes of the shoulders as well as the main body. This means that Transition no longer needs to override getComponentMass since the default implementation of density * volume now works correctly.

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Added helper function to RocketComponent to compute the volume of a ring component by computing the "mass" with density of 1.0.
This commit is contained in:
Kevin Ruland 2012-04-24 18:24:22 +00:00
parent 40b28eeb3a
commit 4731a7345d
3 changed files with 18 additions and 19 deletions
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4
core/src/net/sf/openrocket/rocketcomponent/RocketComponent.java
View File

@ -1722,6 +1722,10 @@ public abstract class RocketComponent implements ChangeSource, Cloneable, Iterab
ringMass(outerRadius, innerRadius, x2 - x1, density));
}
protected static final double ringVolume( double outerRadius, double innerRadius, double length ) {
return ringMass( outerRadius, innerRadius, length, 1.0 );
}
protected static final double ringMass(double outerRadius, double innerRadius,
double length, double density) {
return Math.PI * (MathUtil.pow2(outerRadius) - MathUtil.pow2(innerRadius)) *

18
core/src/net/sf/openrocket/rocketcomponent/Transition.java
View File

@ -441,33 +441,33 @@ public class Transition extends SymmetricComponent {
addBound(bounds, getLength() + aftShoulderLength, aftShoulderRadius);
return bounds;
}
@Override
public double getComponentMass() {
double mass = super.getComponentMass();
public double getComponentVolume() {
double volume = super.getComponentVolume();
if (getForeShoulderLength() > 0.001) {
final double or = getForeShoulderRadius();
final double ir = Math.max(getForeShoulderRadius() - getForeShoulderThickness(), 0);
mass += ringMass(or, ir, getForeShoulderLength(), getMaterial().getDensity());
volume += ringVolume( or, ir, getForeShoulderLength() );
}
if (isForeShoulderCapped()) {
final double ir = Math.max(getForeShoulderRadius() - getForeShoulderThickness(), 0);
mass += ringMass(ir, 0, getForeShoulderThickness(), getMaterial().getDensity());
volume += ringVolume(ir, 0, getForeShoulderThickness() );
}
if (getAftShoulderLength() > 0.001) {
final double or = getAftShoulderRadius();
final double ir = Math.max(getAftShoulderRadius() - getAftShoulderThickness(), 0);
mass += ringMass(or, ir, getAftShoulderLength(), getMaterial().getDensity());
volume += ringVolume(or, ir, getAftShoulderLength() );
}
if (isAftShoulderCapped()) {
final double ir = Math.max(getAftShoulderRadius() - getAftShoulderThickness(), 0);
mass += ringMass(ir, 0, getAftShoulderThickness(), getMaterial().getDensity());
volume += ringVolume(ir, 0, getAftShoulderThickness() );
}
return mass;
return volume;
}
@Override
public Coordinate getComponentCG() {
Coordinate cg = super.getComponentCG();

15
core/test/net/sf/openrocket/rocketcomponent/SymmetricComponentVolumeTest.java
View File

@ -59,8 +59,7 @@ public class SymmetricComponentVolumeTest extends BaseTestCase {
System.out.println( volume + "\t" + mass );
// FIXME
//assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( mass, nc.getMass(), epsilonPercent * mass );
}
@ -133,8 +132,7 @@ public class SymmetricComponentVolumeTest extends BaseTestCase {
System.out.println( volume );
// FIXME
//assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( mass, nc.getMass(), epsilonPercent * mass );
}
@ -196,8 +194,7 @@ public class SymmetricComponentVolumeTest extends BaseTestCase {
System.out.println( volume );
// FIXME
//assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( mass, nc.getMass(), epsilonPercent * mass );
}
@ -290,8 +287,7 @@ public class SymmetricComponentVolumeTest extends BaseTestCase {
System.out.println( volume );
// FIXME
//assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( mass, nc.getMass(), epsilonPercent * mass );
}
@ -386,8 +382,7 @@ public class SymmetricComponentVolumeTest extends BaseTestCase {
System.out.println( volume );
// FIXME
//assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( volume, nc.getComponentVolume(), epsilonPercent * volume);
assertEquals( mass, nc.getMass(), epsilonPercent * mass );
}