public static double CalculateOriginalLengthFromFinalTension(this Wire wire, Creep creep)
{
double startingCatenaryCosntant = wire.StartingTension / wire.FinalWireLinearWeight;
double startingArcLength = WeatherExtensions.CalculateArcLength(wire.StartingSpanLength, wire.StartingElevation, startingCatenaryCosntant);
double stressFreeLength = startingArcLength - wire.StartingTension * startingArcLength / (wire.TotalCrossSection * WireExtensions.CalculateWireElasticity(wire));
double creepStrain = CreepExtensions.CalculateCreepStrain(creep, wire);
return(stressFreeLength / (1 + creepStrain));
}
public static double CalculateOriginalLengthFromInitialTension(this Wire wire)
{
//calculate the average tension in the wire then find the initial stress
double startingCatenaryCosntant = wire.StartingTension / wire.InitialWireLinearWeight;
double LeftVerticalForce = -MathUtility.Sinh(WeatherExtensions.CalculateXc(wire.StartingSpanLength, wire.StartingElevation, startingCatenaryCosntant) / startingCatenaryCosntant) * wire.StartingTension;
double LeftTotalTension = Math.Sqrt(Math.Pow(LeftVerticalForce, 2) + Math.Pow(wire.StartingTension, 2));
double RightVerticalForce = -MathUtility.Sinh(WeatherExtensions.CalculateXc(wire.StartingSpanLength, -wire.StartingElevation, startingCatenaryCosntant) / startingCatenaryCosntant) * wire.StartingTension;
double RightTotalTension = Math.Sqrt(Math.Pow(RightVerticalForce, 2) + Math.Pow(wire.StartingTension, 2));
double averageTension = (LeftTotalTension + RightTotalTension) / 2 - wire.InitialWireLinearWeight * WeatherExtensions.CalculateSag(startingCatenaryCosntant, wire.StartingSpanLength, wire.StartingElevation) / 2;
double initialStress = averageTension / wire.TotalCrossSection;
double initialStrain = CalculateStringingStrain(wire, initialStress);
double initialArcLength = WeatherExtensions.CalculateArcLength(wire.StartingSpanLength, wire.StartingElevation, startingCatenaryCosntant);
return(initialArcLength / (1 + initialStrain));
}