fgturboprop.cpp

6 DOF Missle Simulation

  EngPower_HP *= EnginePowerVC->GetValue();
  if (EngPower_HP > MaxPower) EngPower_HP = MaxPower;

  eff_coef = 9.333 - (N1)/12; // 430%Fuel at 60%N1
  FuelFlow_pph = PSFC * EngPower_HP * eff_coef;

  Eng_Temperature = ExpSeek(&Eng_Temperature,Eng_ITT_degC,300,400);
  double ITT_goal = ITT_N1->GetValue((N1-old_N1)*300+N1,1);
  Eng_ITT_degC  = ExpSeek(&Eng_ITT_degC,ITT_goal,ITT_Delay,ITT_Delay*1.2);

  OilPressure_psi = (N1/100.0*0.25+(0.1-(OilTemp_degK-273.15)*0.1/80.0)*N1/100.0) / 7692.0e-6; //from MPa to psi
//---
  EPR = 1.0 + thrust/MilThrust;

  OilTemp_degK = Seek(&OilTemp_degK, 353.15, 0.4-N1*0.001, 0.04);

  ConsumeFuel();

  if (Cutoff) phase = tpOff;
  if (Starved) phase = tpOff;

  return EngPower_HP;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::SpinUp(void)
{
  double EngPower_HP;
  Running = false; EngStarting = true;
  FuelFlow_pph = 0.0;

  if (!GeneratorPower) {
    EngStarting=false;
    phase=tpOff;
    StartTime = -1;
    return 0.0;
  }

  N1 = ExpSeek(&N1, StarterN1, Idle_Max_Delay * 6, Idle_Max_Delay * 2.4);

  Eng_Temperature = ExpSeek(&Eng_Temperature,TAT,300,400);
  double ITT_goal = ITT_N1->GetValue(N1,0.1) + ((N1>20) ? 0.0 : (20-N1)/20.0 * Eng_Temperature);
  Eng_ITT_degC  = ExpSeek(&Eng_ITT_degC,ITT_goal,ITT_Delay,ITT_Delay*1.2);

  OilTemp_degK = ExpSeek(&OilTemp_degK,273.15 + TAT, 400 , 400);

  OilPressure_psi = (N1/100.0*0.25+(0.1-(OilTemp_degK-273.15)*0.1/80.0)*N1/100.0) / 7692.0e-6; //from MPa to psi
  NozzlePosition = 1.0;

  EngPower_HP = EnginePowerRPM_N1->GetValue(Prop_RPM,N1);
  EngPower_HP *= EnginePowerVC->GetValue();
  if (EngPower_HP > MaxPower) EngPower_HP = MaxPower;

  if (StartTime>=0) StartTime+=dt;
  if (StartTime > MaxStartingTime && MaxStartingTime > 0) { //start failed due timeout
    phase = tpOff;
    StartTime = -1;
  }

  ConsumeFuel(); // for possible setting Starved = false when fuel tank
                 // is refilled (fuel crossfeed etc.)

  return EngPower_HP;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::Start(void)
{
  double EngPower_HP,eff_coef;
  EngStarting = false;
  if ((N1 > 15.0) && !Starved) {       // minimum 15% N2 needed for start
    double old_N1 = N1;
    Cranking = true;                   // provided for sound effects signal
    if (N1 < IdleN1) {
      EngPower_HP = EnginePowerRPM_N1->GetValue(Prop_RPM,N1);
      EngPower_HP *= EnginePowerVC->GetValue();
      if (EngPower_HP > MaxPower) EngPower_HP = MaxPower;
      N1 = ExpSeek(&N1, IdleN1*1.1, Idle_Max_Delay*4, Idle_Max_Delay * 2.4);
      eff_coef = 9.333 - (N1)/12; // 430%Fuel at 60%N1
      FuelFlow_pph = PSFC * EngPower_HP * eff_coef;
      Eng_Temperature = ExpSeek(&Eng_Temperature,Eng_ITT_degC,300,400);
      double ITT_goal = ITT_N1->GetValue((N1-old_N1)*300+N1,1);
      Eng_ITT_degC  = ExpSeek(&Eng_ITT_degC,ITT_goal,ITT_Delay,ITT_Delay*1.2);

      OilPressure_psi = (N1/100.0*0.25+(0.1-(OilTemp_degK-273.15)*0.1/80.0)*N1/100.0) / 7692.0e-6; //from MPa to psi
      OilTemp_degK = Seek(&OilTemp_degK, 353.15, 0.4-N1*0.001, 0.04);

    } else {
      phase = tpRun;
      Running = true;
      Starter = false;
      Cranking = false;
      FuelFlow_pph = 0;
      EngPower_HP=0.0;
    }
  } else {                 // no start if N2 < 15% or Starved
    phase = tpOff;
    Starter = false;
  }

  ConsumeFuel();

  return EngPower_HP;
}


//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::CalcFuelNeed(void)
{
  double dT = State->Getdt() * Propulsion->GetRate();
  FuelFlowRate = FuelFlow_pph / 3600.0;
  FuelExpended = FuelFlowRate * dT;
  return FuelExpended;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::Seek(double *var, double target, double accel, double decel)
{
  double v = *var;
  if (v > target) {
    v -= dt * decel;
    if (v < target) v = target;
  } else if (v < target) {
    v += dt * accel;
    if (v > target) v = target;
  }
  return v;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::ExpSeek(double *var, double target, double accel_tau, double decel_tau)
{
// exponential delay instead of the linear delay used in Seek
  double v = *var;
  if (v > target) {
    v = (v - target) * exp ( -dt / decel_tau) + target;
  } else if (v < target) {
    v = (target - v) * (1 - exp ( -dt / accel_tau)) + v;
  }
  return v;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void FGTurboProp::SetDefaults(void)
{
  Name = "Not defined";
  N1 = N2 = 0.0;
  Type = etTurboprop;
  MilThrust = 10000.0;
  IdleN1 = 30.0;
  IdleN2 = 60.0;
  MaxN1 = 100.0;
  MaxN2 = 100.0;
  ThrottleCmd = 0.0;
  InletPosition = 1.0;
  NozzlePosition = 1.0;
  Reversed = false;
  Cutoff = true;
  phase = tpOff;
  Stalled = false;
  Seized = false;
  Overtemp = false;
  Fire = false;
  Eng_ITT_degC = 0.0;

  GeneratorPower=true;
  Condition = 0;
  Ielu_intervent=false;

  Idle_Max_Delay = 1.0;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


string FGTurboProp::GetEngineLabels(string delimeter)
{
  std::ostringstream buf;

  buf << Name << "_N1[" << EngineNumber << "]" << delimeter
      << Name << "_N2[" << EngineNumber << "]" << delimeter
      << Name << "__PwrAvailJVK[" << EngineNumber << "]" << delimeter
      << Thruster->GetThrusterLabels(EngineNumber, delimeter);

  return buf.str();
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

string FGTurboProp::GetEngineValues(string delimeter)
{
  std::ostringstream buf;

  buf << N1 << delimeter
      << N2 << delimeter
      << Thruster->GetThrusterValues(EngineNumber,delimeter);

  return buf.str();
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
int FGTurboProp::InitRunning(void) {
  State->SuspendIntegration();
  Cutoff=false;
  Running=true;  
  N2=16.0;
  Calculate();
  State->ResumeIntegration();
  return phase==tpRun;
}

void FGTurboProp::bindmodel()
{
  char property_name[80];

// ToDo: Do a proper Tie here, this should be read only.

  snprintf(property_name, 80, "propulsion/engine[%u]/n1", EngineNumber);
  PropertyManager->Tie( property_name, &N1);
  snprintf(property_name, 80, "propulsion/engine[%u]/n2", EngineNumber);
  PropertyManager->Tie( property_name, &N2);
  snprintf(property_name, 80, "propulsion/engine[%u]/reverser", EngineNumber);
  PropertyManager->Tie( property_name, &Reversed);

}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//    The bitmasked value choices are as follows:
//    unset: In this case (the default) JSBSim would only print
//       out the normally expected messages, essentially echoing
//       the config files as they are read. If the environment
//       variable is not set, debug_lvl is set to 1 internally
//    0: This requests JSBSim not to output any messages
//       whatsoever.
//    1: This value explicity requests the normal JSBSim
//       startup messages
//    2: This value asks for a message to be printed out when
//       a class is instantiated
//    4: When this value is set, a message is displayed when a
//       FGModel object executes its Run() method
//    8: When this value is set, various runtime state variables
//       are printed out periodically
//    16: When set various parameters are sanity checked and
//       a message is printed out when they go out of bounds

void FGTurboProp::Debug(int from)
{
  if (debug_lvl <= 0) return;

  if (debug_lvl & 1) { // Standard console startup message output
    if (from == 0) { // Constructor

    }
    if (from == 2) { // called from Load()
      cout << "\n ****MUJ MOTOR TURBOPROP****\n";
      cout << "\n    Engine Name: "         << Name << endl;
      cout << "      MilThrust:   "         << MilThrust << endl;
      cout << "      IdleN1:      "         << IdleN1 << endl;
      cout << "      MaxN1:       "         << MaxN1 << endl;

      cout << endl;
    }
  }
  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
    if (from == 0) cout << "Instantiated: FGTurboProp" << endl;
    if (from == 1) cout << "Destroyed:    FGTurboProp" << endl;
  }
  if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
  }
  if (debug_lvl & 8 ) { // Runtime state variables
  }
  if (debug_lvl & 16) { // Sanity checking
  }
  if (debug_lvl & 64) {
    if (from == 0) { // Constructor
      cout << IdSrc << endl;
      cout << IdHdr << endl;
    }
  }
}
}