git.gag.com Git - debian/openrocket/blob - src/net/sf/openrocket/simulation/listeners/haisu/HaisuCatoListener.java

   1 package net.sf.openrocket.simulation.listeners.haisu;
   2
   3 import net.sf.openrocket.aerodynamics.AerodynamicForces;
   4 import net.sf.openrocket.aerodynamics.FlightConditions;
   5 import net.sf.openrocket.simulation.SimulationStatus;
   6 import net.sf.openrocket.simulation.listeners.AbstractSimulationListener;
   7
   8 public class HaisuCatoListener extends AbstractSimulationListener {
   9
  10         private static final double POSITION = 0.8;
  11         private static final double CNA = 5.16;
  12
  13         private final double alpha;
  14
  15         public HaisuCatoListener(double alpha) {
  16                 this.alpha = alpha;
  17         }
  18
  19         @Override
  20         public void forceCalculation(SimulationStatus status, FlightConditions conditions,
  21                         AerodynamicForces forces) {
  22
  23                 double cn = CNA * alpha;
  24                 double cm = cn * POSITION / conditions.getRefLength();
  25
  26                 double theta = conditions.getTheta();
  27                 double costheta = Math.cos(theta);
  28
  29                 forces.CN += cn * costheta;
  30                 forces.Cm += cm * costheta;
  31
  32                 if (Math.abs(costheta) < 0.99) {
  33                         System.err.println("THETA = "+(theta*180/Math.PI)+ " aborting...");
  34                         System.exit(1);
  35                 }
  36         }
  37
  38 }