git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/rocketcomponent/Streamer.java

   1 package net.sf.openrocket.rocketcomponent;
   2
   3 import net.sf.openrocket.util.MathUtil;
   4
   5 public class Streamer extends RecoveryDevice {
   6
   7         public static final double DEFAULT_CD = 0.6;
   8
   9         public static final double MAX_COMPUTED_CD = 0.4;
  10
  11
  12         private double stripLength;
  13         private double stripWidth;
  14
  15
  16         public Streamer() {
  17                 this.stripLength = 0.5;
  18                 this.stripWidth = 0.05;
  19         }
  20
  21
  22         public double getStripLength() {
  23                 return stripLength;
  24         }
  25
  26         public void setStripLength(double stripLength) {
  27                 if (MathUtil.equals(this.stripLength, stripLength))
  28                         return;
  29                 this.stripLength = stripLength;
  30                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  31         }
  32
  33         public double getStripWidth() {
  34                 return stripWidth;
  35         }
  36
  37         public void setStripWidth(double stripWidth) {
  38                 if (MathUtil.equals(this.stripWidth, stripWidth))
  39                         return;
  40                 this.stripWidth = stripWidth;
  41                 this.length = stripWidth;
  42                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  43         }
  44
  45         @Override
  46         public void setLength(double length) {
  47                 setStripWidth(length);
  48         }
  49
  50
  51         public double getAspectRatio() {
  52                 if (stripWidth > 0.0001)
  53                         return stripLength / stripWidth;
  54                 return 1000;
  55         }
  56
  57         public void setAspectRatio(double ratio) {
  58                 if (MathUtil.equals(getAspectRatio(), ratio))
  59                         return;
  60
  61                 ratio = Math.max(ratio, 0.01);
  62                 double area = getArea();
  63                 stripWidth = MathUtil.safeSqrt(area / ratio);
  64                 stripLength = ratio * stripWidth;
  65                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  66         }
  67
  68
  69         @Override
  70         public double getArea() {
  71                 return stripWidth * stripLength;
  72         }
  73
  74         public void setArea(double area) {
  75                 if (MathUtil.equals(getArea(), area))
  76                         return;
  77
  78                 double ratio = Math.max(getAspectRatio(), 0.01);
  79                 stripWidth = MathUtil.safeSqrt(area / ratio);
  80                 stripLength = ratio * stripWidth;
  81                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  82         }
  83
  84
  85
  86         @Override
  87         public double getComponentCD(double mach) {
  88                 double density = this.getMaterial().getDensity();
  89                 double cd;
  90
  91                 cd = 0.034 * ((density + 0.025) / 0.105) * (stripLength + 1) / stripLength;
  92                 cd = MathUtil.min(cd, MAX_COMPUTED_CD);
  93                 return cd;
  94         }
  95
  96         @Override
  97         public String getComponentName() {
  98                 return "Streamer";
  99         }
 100
 101         @Override
 102         public boolean allowsChildren() {
 103                 return false;
 104         }
 105
 106         @Override
 107         public boolean isCompatible(Class<? extends RocketComponent> type) {
 108                 return false;
 109         }
 110 }