private void ResponseToInitialConditionsCalculate()
{
if (ResponseNeedsToRecalculate)
{
if (ResponseToInitialConditions == null)
{
ResponseToInitialConditions = new List <double>();
}
ResponseToInitialConditions.Clear();
// DateTime time = DateTime.Now;
if (InitialDisplacement == 0.0 && InitialVelocity == 0.0)
{
foreach (double item in TimeIntervals)
{
ResponseToInitialConditions.Add(0.0);
}
}
else
{
foreach (double item in TimeIntervals)
{
if (DampingRatio < 1.0)
{
double C1 = InitialDisplacement;
double C2 = (InitialVelocity + (DampingRatio * NaturalFrequencyRad * InitialDisplacement)) / DampedNaturalFrequency;
//double X = Math.Sqrt(Math.Pow(C1, 2) + Math.Pow(C2, 2));
double Phy = Math.Atan((DampedNaturalFrequency * InitialDisplacement) / (InitialVelocity + (DampingRatio * NaturalFrequencyRad * InitialDisplacement)));
//double X = InitialDisplacement / Math.Sin(Phy);
double x = Math.Exp(-DampingRatio * NaturalFrequencyRad * item) * ((C1 * Math.Cos(DampedNaturalFrequency * item)) + (C2 * Math.Sin(DampedNaturalFrequency * item)));
//double x = X * Math.Exp(-DampingRatio * NaturalFrequencyRad * item) * Math.Cos((DampedNaturalFrequency * item) - Phy);
ResponseToInitialConditions.Add(x);
}
else if (DampingRatio == 1.0)
{
double C1 = InitialDisplacement;
double C2 = InitialVelocity + (NaturalFrequencyRad * InitialDisplacement);
double x = (C1 + (C2 * item)) * Math.Exp(-NaturalFrequencyRad * item);
ResponseToInitialConditions.Add(x);
}
else if (DampingRatio > 1.0)
{
double C1 = (InitialDisplacement * NaturalFrequencyRad * (DampingRatio + Math.Sqrt(Math.Pow(DampingRatio, 2) - 1)) + InitialVelocity) / (2 * NaturalFrequencyRad * Math.Sqrt(Math.Pow(DampingRatio, 2) - 1));
double C2 = (-InitialDisplacement * NaturalFrequencyRad * (DampingRatio - Math.Sqrt(Math.Pow(DampingRatio, 2) - 1)) - InitialVelocity) / (2 * NaturalFrequencyRad * Math.Sqrt(Math.Pow(DampingRatio, 2) - 1));
double x = (C1 * Math.Exp((-DampingRatio + Math.Sqrt(Math.Pow(DampingRatio, 2) - 1)) * NaturalFrequencyRad * item)) + (C2 * Math.Exp((-DampingRatio - Math.Sqrt(Math.Pow(DampingRatio, 2) - 1)) * NaturalFrequencyRad * item));
ResponseToInitialConditions.Add(x);
}
}
}
}
//_tResponseToInitialConditions = (DateTime.Now - time).TotalMilliseconds;
}
private void InitialConditionDisplacementCalculate()
{
if (VehicleDataNeedsToRecalculate)
{
if (ResponseToInitialConditions == null)
{
ResponseToInitialConditions = new List <double>();
}
}
ResponseToInitialConditions.Clear();
if (InitialDisplacement == 0 && InitialVelocity == 0)
{
foreach (double item in TimeIntervals)
{
double x = 0.0 * item;
ResponseToInitialConditions.Add(x);
}
}
else
{
foreach (double item in TimeIntervals)
{
if (DampingRatio < 1)
{
double C1 = InitialDisplacement;
double C2 = (InitialVelocity + (DampingRatio * NaturalFrequencyRad * InitialDisplacement)) / DampedNaturalFrequency;
double X = Math.Sqrt(Math.Pow(C1, 2) + Math.Pow(C2, 2));
double Phy = Math.Atan(C2 / C1);
double x = -X *Math.Exp(-DampingRatio *NaturalFrequencyRad *item) * Math.Cos((DampedNaturalFrequency * item) - Phy);
ResponseToInitialConditions.Add(x);
}
else if (DampingRatio == 1)
{
double C1 = InitialDisplacement;
double C2 = InitialVelocity + (NaturalFrequencyRad * InitialDisplacement);
double x = (C1 + (C2 * item)) * Math.Exp(-NaturalFrequencyRad * item);
ResponseToInitialConditions.Add(x);
}
else if (DampingRatio > 1)
{
double C1 = (InitialDisplacement * NaturalFrequencyRad * (DampingRatio + Math.Sqrt(Math.Pow(DampingRatio, 2) - 1)) + InitialVelocity) / (2 * NaturalFrequencyRad * Math.Sqrt(Math.Pow(DampingRatio, 2) - 1));
double C2 = (-InitialDisplacement * NaturalFrequencyRad * (DampingRatio - Math.Sqrt(Math.Pow(DampingRatio, 2) - 1)) - InitialVelocity) / (2 * NaturalFrequencyRad * Math.Sqrt(Math.Pow(DampingRatio, 2) - 1));
double x = (C1 * Math.Exp((-DampingRatio + Math.Sqrt(Math.Pow(DampingRatio, 2) - 1)) * NaturalFrequencyRad * item)) + (C2 * Math.Exp((-DampingRatio - Math.Sqrt(Math.Pow(DampingRatio, 2) - 1)) * NaturalFrequencyRad * item));
ResponseToInitialConditions.Add(x);
}
}
}
}
