test/src/TestGlidePolar.cpp

   1 /* Copyright_License {
   2
   3   XCSoar Glide Computer - http://www.xcsoar.org/
   4   Copyright (C) 2000-2013 The XCSoar Project
   5   A detailed list of copyright holders can be found in the file "AUTHORS".
   6
   7   This program is free software; you can redistribute it and/or
   8   modify it under the terms of the GNU General Public License
   9   as published by the Free Software Foundation; either version 2
  10   of the License, or (at your option) any later version.
  11
  12   This program is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with this program; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20 }
  21 */
  22
  23 #include "TestUtil.hpp"
  24 #include "GlideSolvers/GlidePolar.hpp"
  25 #include "Units/System.hpp"
  26
  27 #include <cstdio>
  28
  29 class GlidePolarTest
  30 {
  31   GlidePolar polar;
  32
  33 public:
  34   void Run();
  35
  36 private:
  37   void Init();
  38   void TestBasic();
  39   void TestBallast();
  40   void TestBugs();
  41   void TestMC();
  42 };
  43
  44 void
  45 GlidePolarTest::Init()
  46 {
  47   // Polar 1 from PolarStore (206 Hornet)
  48   polar.SetCoefficients(PolarCoefficients(fixed(0.0022032), fixed(-0.08784),
  49                                           fixed(1.47)), false);
  50
  51   polar.SetReferenceMass(fixed(318), false);
  52   polar.SetDryMass(fixed(318), false);
  53   polar.SetBallastRatio(fixed(100) / polar.reference_mass);
  54
  55   polar.SetWingArea(fixed(9.8));
  56
  57   // No ballast and no bugs on the wings
  58   polar.ballast = fixed(0);
  59   polar.bugs = fixed(1);
  60
  61   // MC zero
  62   polar.mc = fixed(0);
  63
  64   polar.SetVMax(Units::ToSysUnit(fixed(200), Unit::KILOMETER_PER_HOUR), false);
  65 }
  66
  67 void
  68 GlidePolarTest::TestBasic()
  69 {
  70   polar.Update();
  71
  72   ok1(equals(polar.polar.a, polar.ideal_polar.a));
  73   ok1(equals(polar.polar.b, polar.ideal_polar.b));
  74   ok1(equals(polar.polar.c, polar.ideal_polar.c));
  75
  76   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(80), Unit::KILOMETER_PER_HOUR)), 0.606));
  77   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(120), Unit::KILOMETER_PER_HOUR)), 0.99));
  78   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(160), Unit::KILOMETER_PER_HOUR)), 1.918));
  79
  80   ok1(equals(polar.GetSMax(), polar.SinkRate(polar.GetVMax())));
  81
  82   ok1(equals(polar.GetVMin(), 19.934640523));
  83   ok1(equals(polar.GetSMin(), polar.SinkRate(polar.GetVMin())));
  84   ok1(equals(polar.GetVTakeoff(), polar.GetVMin() / 2));
  85
  86   ok1(equals(polar.GetVBestLD(), 25.830434162));
  87   ok1(equals(polar.GetSBestLD(), polar.SinkRate(polar.GetVBestLD())));
  88   ok1(equals(polar.GetBestLD(), polar.GetVBestLD() / polar.GetSBestLD()));
  89
  90   ok1(equals(polar.GetTotalMass(), 318));
  91   ok1(equals(polar.GetWingLoading(), 32.448979592));
  92   ok1(equals(polar.GetBallast(), 0));
  93   ok1(equals(polar.GetBallastLitres(), 0));
  94   ok1(polar.IsBallastable());
  95   ok1(!polar.HasBallast());
  96 }
  97
  98 void
  99 GlidePolarTest::TestBallast()
 100 {
 101   polar.SetBallast(fixed(0.25));
 102
 103   ok1(equals(polar.GetBallastLitres(), 25));
 104   ok1(equals(polar.GetBallast(), 0.25));
 105
 106   polar.SetBallastLitres(fixed(50));
 107
 108   ok1(equals(polar.GetBallastLitres(), 50));
 109   ok1(equals(polar.GetBallast(), 0.5));
 110   ok1(equals(polar.GetTotalMass(), 368));
 111   ok1(equals(polar.GetWingLoading(), 37.551020408));
 112   ok1(polar.HasBallast());
 113
 114   fixed loading_factor = sqrt(polar.GetTotalMass() / polar.reference_mass);
 115   ok1(equals(polar.polar.a, polar.ideal_polar.a / loading_factor));
 116   ok1(equals(polar.polar.b, polar.ideal_polar.b));
 117   ok1(equals(polar.polar.c, polar.ideal_polar.c * loading_factor));
 118
 119   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(80), Unit::KILOMETER_PER_HOUR)),
 120              0.640739));
 121   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(120), Unit::KILOMETER_PER_HOUR)),
 122              0.928976));
 123   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(160), Unit::KILOMETER_PER_HOUR)),
 124              1.722908));
 125
 126   ok1(equals(polar.GetVMin(), 21.44464));
 127   ok1(equals(polar.GetVBestLD(), 27.78703));
 128
 129   polar.SetBallast(fixed(0));
 130   ok1(!polar.HasBallast());
 131 }
 132
 133 void
 134 GlidePolarTest::TestBugs()
 135 {
 136   polar.SetBugs(fixed(0.75));
 137   ok1(equals(polar.GetBugs(), 0.75));
 138
 139   ok1(equals(polar.polar.a, polar.ideal_polar.a * 4 / 3));
 140   ok1(equals(polar.polar.b, polar.ideal_polar.b * 4 / 3));
 141   ok1(equals(polar.polar.c, polar.ideal_polar.c * 4 / 3));
 142
 143   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(80), Unit::KILOMETER_PER_HOUR)),
 144              0.808));
 145   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(120), Unit::KILOMETER_PER_HOUR)),
 146              1.32));
 147   ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(160), Unit::KILOMETER_PER_HOUR)),
 148              2.557333));
 149
 150   ok1(equals(polar.GetVMin(), 19.93464));
 151   ok1(equals(polar.GetVBestLD(), 25.83043));
 152
 153   polar.SetBugs(fixed(1));
 154 }
 155
 156 void
 157 GlidePolarTest::TestMC()
 158 {
 159   polar.SetMC(fixed(1));
 160   ok1(equals(polar.GetVBestLD(), 33.482780452));
 161
 162   polar.SetMC(fixed(0));
 163   ok1(equals(polar.GetVBestLD(), 25.830434162));
 164 }
 165
 166 void
 167 GlidePolarTest::Run()
 168 {
 169   Init();
 170   TestBasic();
 171   TestBallast();
 172   TestBugs();
 173   TestMC();
 174 }
 175
 176 int main(int argc, char **argv)
 177 {
 178   plan_tests(46);
 179
 180   GlidePolarTest test;
 181   test.Run();
 182
 183   return exit_status();
 184 }