private static double GetRotationSpeed(AircraftData aircraftData)
{
double stallSpeed = AerodynamicsHelper.CalculateStallSpeed(aircraftData.AerodynamicsData,
aircraftData.TakeOffWeight * 1000,
airDensity);
double rotationSpeed = stallSpeed * 1.2;
return(rotationSpeed);
}
private bool ShouldRotate(AircraftState aircraftState)
{
double rotationSpeed = 1.2 * AerodynamicsHelper.CalculateStallSpeed(AerodynamicsData,
GetNewton(AircraftData.TakeOffWeight),
Density);
return(aircraftState.TrueAirspeed >= rotationSpeed &&
aircraftState.PitchAngle < AircraftData.MaximumPitchAngle);
}
private static IEnumerable <TestCaseData> GetInvalidDensityTestCases()
{
var random = new Random(21);
AerodynamicsData aerodynamicsData = AerodynamicsDataTestFactory.CreateAerodynamicsData();
Angle angleOfAttack = random.NextAngle();
double liftCoefficient = random.NextDouble();
double invalidDensity = -random.NextDouble();
double velocity = random.NextDouble();
double takeOffWeight = random.NextDouble();
yield return(new TestCaseData(new Action(() => AerodynamicsHelper.CalculateLift(aerodynamicsData,
angleOfAttack,
invalidDensity,
velocity)))
.SetName("CalculateLift - Negative"));
yield return(new TestCaseData(new Action(() => AerodynamicsHelper.CalculateLift(aerodynamicsData,
angleOfAttack,
0,
velocity)))
.SetName("CalculateLift - Zero"));
yield return(new TestCaseData(new Action(() => AerodynamicsHelper.CalculateDragWithEngineFailure(aerodynamicsData,
liftCoefficient,
invalidDensity,
velocity)))
.SetName("CalculateDragWithEngineFailure - Negative"));
yield return(new TestCaseData(new Action(() => AerodynamicsHelper.CalculateDragWithEngineFailure(aerodynamicsData,
liftCoefficient,
0,
velocity)))
.SetName("CalculateDragWithEngineFailure - Zero"));
yield return(new TestCaseData(new Action(() => AerodynamicsHelper.CalculateDragWithoutEngineFailure(aerodynamicsData,
liftCoefficient,
invalidDensity,
velocity)))
.SetName("CalculateDragWithoutEngineFailure - Negative"));
yield return(new TestCaseData(new Action(() => AerodynamicsHelper.CalculateDragWithoutEngineFailure(aerodynamicsData,
liftCoefficient,
0,
velocity)))
.SetName("CalculateDragWithoutEngineFailure - Zero"));
yield return(new TestCaseData(new Action(() => AerodynamicsHelper.CalculateStallSpeed(aerodynamicsData,
takeOffWeight,
invalidDensity)))
.SetName("CalculateStallSpeed - Negative"));
yield return(new TestCaseData(new Action(() => AerodynamicsHelper.CalculateStallSpeed(aerodynamicsData,
takeOffWeight,
0)))
.SetName("CalculateStallSpeed - Zero"));
}
public static void CalculateStallSpeed_WithValidParametersWithinLimits_ReturnsExpectedValues(AerodynamicsData aerodynamicsData)
{
// Setup
const double weight = 500e3; // N
// Call
double stallSpeed = AerodynamicsHelper.CalculateStallSpeed(aerodynamicsData, weight, airDensity);
// Assert
double expectedStallSpeed = Math.Sqrt(2 * weight / (aerodynamicsData.MaximumLiftCoefficient * airDensity * aerodynamicsData.WingArea));
Assert.AreEqual(expectedStallSpeed, stallSpeed, tolerance);
}
public static void CalculateStallSpeed_AerodynamicsDataNull_ThrowsArgumentNullException()
{
// Setup
var random = new Random(21);
// Call
TestDelegate call = () => AerodynamicsHelper.CalculateStallSpeed(null,
random.NextDouble(),
random.NextDouble());
// Assert
var exception = Assert.Throws <ArgumentNullException>(call);
Assert.AreEqual("aerodynamicsData", exception.ParamName);
}