public static void Calculate_WithAircraftStateHeightSmallerThanThresholdAndLiftSmallerThanTakeOffWeight_ReturnsExpectedTrueAirspeedRate(AircraftData aircraftData)
{
// Setup
const double airspeed = 10.0;
const double threshold = 0.01;
var random = new Random(21);
var aircraftState = new AircraftState(aircraftData.MaximumPitchAngle,
random.NextAngle(),
airspeed,
threshold - random.NextDouble(),
random.NextDouble());
Angle angleOfAttack = aircraftState.PitchAngle - aircraftState.FlightPathAngle;
// Precondition
double lift = AerodynamicsHelper.CalculateLift(aircraftData.AerodynamicsData,
angleOfAttack,
airDensity,
airspeed);
double takeOffWeightNewton = aircraftData.TakeOffWeight * 1000; // N
Assert.IsTrue(lift < takeOffWeightNewton);
var calculator = new AbortedTakeOffDynamicsCalculator(aircraftData, airDensity, gravitationalAcceleration);
// Call
AircraftAccelerations accelerations = calculator.Calculate(aircraftState);
// Assert
double liftCoefficient = AerodynamicsHelper.CalculateLiftCoefficient(aircraftData.AerodynamicsData, angleOfAttack);
double normalForce = takeOffWeightNewton - lift;
double dragForce = AerodynamicsHelper.CalculateDragWithEngineFailure(aircraftData.AerodynamicsData,
liftCoefficient,
airDensity,
airspeed) + normalForce * aircraftData.BrakingResistanceCoefficient;
const double thrustForce = 0;
double horizontalWeightComponent = takeOffWeightNewton * Math.Sin(aircraftState.FlightPathAngle.Radians);
double expectedAcceleration = (gravitationalAcceleration * (thrustForce - dragForce - horizontalWeightComponent))
/ takeOffWeightNewton;
Assert.AreEqual(expectedAcceleration, accelerations.TrueAirSpeedRate, tolerance);
}
public static void Calculate_Always_ReturnsExpectedZeroPitchRate()
{
// Setup
var random = new Random(21);
AircraftData aircraftData = AircraftDataTestFactory.CreateRandomAircraftData();
Angle angleOfAttack = AerodynamicsDataTestHelper.GetValidAngleOfAttack(aircraftData.AerodynamicsData);
var aircraftState = new AircraftState(angleOfAttack,
new Angle(),
random.NextDouble(),
random.NextDouble(),
random.NextDouble());
var calculator = new AbortedTakeOffDynamicsCalculator(aircraftData, random.NextDouble(), random.NextDouble());
// Call
AircraftAccelerations accelerations = calculator.Calculate(aircraftState);
// Assert
Assert.Zero(accelerations.PitchRate.Radians);
}