void
GlidePolarTest::TestBasic()
{
polar.Update();
ok1(equals(polar.polar.a, polar.ideal_polar.a));
ok1(equals(polar.polar.b, polar.ideal_polar.b));
ok1(equals(polar.polar.c, polar.ideal_polar.c));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(80), Unit::KILOMETER_PER_HOUR)), 0.606));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(120), Unit::KILOMETER_PER_HOUR)), 0.99));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(160), Unit::KILOMETER_PER_HOUR)), 1.918));
ok1(equals(polar.GetSMax(), polar.SinkRate(polar.GetVMax())));
ok1(equals(polar.GetVMin(), 19.934640523));
ok1(equals(polar.GetSMin(), polar.SinkRate(polar.GetVMin())));
ok1(equals(polar.GetVTakeoff(), polar.GetVMin() / 2));
ok1(equals(polar.GetVBestLD(), 25.830434162));
ok1(equals(polar.GetSBestLD(), polar.SinkRate(polar.GetVBestLD())));
ok1(equals(polar.GetBestLD(), polar.GetVBestLD() / polar.GetSBestLD()));
ok1(equals(polar.GetTotalMass(), 318));
ok1(equals(polar.GetWingLoading(), 32.448979592));
ok1(equals(polar.GetBallast(), 0));
ok1(equals(polar.GetBallastLitres(), 0));
ok1(polar.IsBallastable());
ok1(!polar.HasBallast());
}
void
GlidePolarTest::TestBallast()
{
polar.SetBallast(fixed(0.25));
ok1(equals(polar.GetBallastLitres(), 25));
ok1(equals(polar.GetBallast(), 0.25));
polar.SetBallastLitres(fixed(50));
ok1(equals(polar.GetBallastLitres(), 50));
ok1(equals(polar.GetBallast(), 0.5));
ok1(equals(polar.GetTotalMass(), 368));
ok1(equals(polar.GetWingLoading(), 37.551020408));
ok1(polar.HasBallast());
fixed loading_factor = sqrt(polar.GetTotalMass() / polar.reference_mass);
ok1(equals(polar.polar.a, polar.ideal_polar.a / loading_factor));
ok1(equals(polar.polar.b, polar.ideal_polar.b));
ok1(equals(polar.polar.c, polar.ideal_polar.c * loading_factor));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(80), Unit::KILOMETER_PER_HOUR)),
0.640739));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(120), Unit::KILOMETER_PER_HOUR)),
0.928976));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(160), Unit::KILOMETER_PER_HOUR)),
1.722908));
ok1(equals(polar.GetVMin(), 21.44464));
ok1(equals(polar.GetVBestLD(), 27.78703));
polar.SetBallast(fixed(0));
ok1(!polar.HasBallast());
}
void
GlidePolarTest::TestBugs()
{
polar.SetBugs(fixed(0.75));
ok1(equals(polar.GetBugs(), 0.75));
ok1(equals(polar.polar.a, polar.ideal_polar.a * 4 / 3));
ok1(equals(polar.polar.b, polar.ideal_polar.b * 4 / 3));
ok1(equals(polar.polar.c, polar.ideal_polar.c * 4 / 3));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(80), Unit::KILOMETER_PER_HOUR)),
0.808));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(120), Unit::KILOMETER_PER_HOUR)),
1.32));
ok1(equals(polar.SinkRate(Units::ToSysUnit(fixed(160), Unit::KILOMETER_PER_HOUR)),
2.557333));
ok1(equals(polar.GetVMin(), 19.93464));
ok1(equals(polar.GetVBestLD(), 25.83043));
polar.SetBugs(fixed(1));
}
static void
Test(const fixed distance, const fixed altitude, const SpeedVector wind)
{
const GeoVector vector(distance, Angle::Zero());
const GlideState state(vector,
fixed(2000), fixed(2000) + altitude,
wind);
const GlideResult result =
MacCready::Solve(glide_settings, glide_polar, state);
const fixed ld_ground = glide_polar.GetLDOverGround(vector.bearing, wind);
const fixed mc = glide_polar.GetMC();
const fixed v_climb_progress = mc * ld_ground - state.head_wind;
const fixed initial_glide_distance = state.altitude_difference * ld_ground;
if (initial_glide_distance >= distance ||
(!positive(mc) && !positive(v_climb_progress))) {
/* reachable by pure glide */
ok1(result.validity == GlideResult::Validity::OK);
const fixed best_speed =
glide_polar.GetBestGlideRatioSpeed(state.head_wind);
const fixed best_sink = glide_polar.SinkRate(best_speed);
const fixed ld_ground2 = positive(mc)
? ld_ground
: (best_speed - state.head_wind) / best_sink;
const fixed height_glide = distance / ld_ground2;
const fixed height_climb = fixed(0);
const fixed altitude_difference = altitude - height_glide;
ok1(equals(result.head_wind, wind.norm));
ok1(equals(result.vector.distance, distance));
ok1(equals(result.height_climb, height_climb));
ok1(equals(result.height_glide, height_glide));
ok1(equals(result.altitude_difference, altitude_difference));
return;
}
if (!positive(v_climb_progress)) {
/* excessive wind */
ok1(result.validity == GlideResult::Validity::WIND_EXCESSIVE);
return;
}
/*
const fixed drifted_distance = (distance - initial_glide_distance)
* state.head_wind / v_climb_progress;
*/
const fixed drifted_height_climb = (distance - initial_glide_distance)
* mc / v_climb_progress;
const fixed drifted_height_glide =
drifted_height_climb + state.altitude_difference;
const fixed height_glide = drifted_height_glide;
const fixed altitude_difference = altitude - height_glide;
const fixed height_climb = drifted_height_climb;
const fixed time_climb = height_climb / mc;
const fixed time_glide = height_glide / glide_polar.GetSBestLD();
const fixed time_elapsed = time_climb + time_glide;
/* more tolerance with strong wind because this unit test doesn't
optimise pure glide */
const int accuracy = positive(altitude) && positive(wind.norm)
? (wind.norm > fixed(5) ? 5 : 10)
: ACCURACY;
ok1(result.validity == GlideResult::Validity::OK);
ok1(equals(result.head_wind, wind.norm));
ok1(equals(result.vector.distance, distance));
ok1(equals(result.height_climb, height_climb, accuracy));
ok1(equals(result.height_glide, height_glide, accuracy));
ok1(equals(result.altitude_difference, altitude_difference, accuracy));
ok1(equals(result.time_elapsed, time_elapsed, accuracy));
}
