1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 Module: FGSimTurbine.cpp
5 Date started: 03/11/2003
6 Purpose: This module models a turbine engine.
8 ------------- Copyright (C) 2003 David Culp (davidculp2@attbi.com) -----------
10 This program is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free Software
12 Foundation; either version 2 of the License, or (at your option) any later
15 This program is distributed in the hope that it will be useful, but WITHOUT
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
20 You should have received a copy of the GNU General Public License along with
21 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
22 Place - Suite 330, Boston, MA 02111-1307, USA.
24 Further information about the GNU General Public License can also be found on
25 the world wide web at http://www.gnu.org.
27 FUNCTIONAL DESCRIPTION
28 --------------------------------------------------------------------------------
30 This class descends from the FGEngine class and models a Turbine engine based
31 on parameters given in the engine config file for this class
34 --------------------------------------------------------------------------------
35 03/11/2003 DPC Created
37 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
39 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
42 #include "FGSimTurbine.h"
46 static const char *IdSrc = "$Id$";
47 static const char *IdHdr = ID_SIMTURBINE;
49 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
51 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
54 FGSimTurbine::FGSimTurbine(FGFDMExec* exec, FGConfigFile* cfg) : FGEngine(exec)
57 FGEngine::Type=etSimTurbine;
62 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
64 FGSimTurbine::~FGSimTurbine()
69 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
71 double FGSimTurbine::Calculate(double dummy)
73 double idlethrust, milthrust, thrust;
74 double TAT = (Auxiliary->GetTotalTemperature() - 491.69) * 0.5555556;
75 dt = State->Getdt() * Propulsion->GetRate();
77 // calculate virtual throttle position (actual +/- lag) based on
78 // FCS Throttle value (except when trimming)
81 ThrottleCmd = FCS->GetThrottleCmd(EngineNumber);
82 if ( ThrottleCmd > throttle ) {
83 throttle += (dt * delay);
84 if (throttle > ThrottleCmd ) throttle = ThrottleCmd;
87 throttle -= (dt * delay * 3.0);
88 if (throttle < ThrottleCmd ) throttle = ThrottleCmd;
93 throttle = ThrottleCmd = FCS->GetThrottleCmd(EngineNumber);
96 idlethrust = MaxMilThrust * ThrustTables[0]->TotalValue();
97 milthrust = MaxMilThrust * ThrustTables[1]->TotalValue();
100 thrust = milthrust * throttle * throttle;
101 if (thrust < idlethrust) thrust = idlethrust;
102 FuelFlow_pph = thrust * TSFC;
103 thrust = thrust * (1.0 - BleedDemand);
104 IdleFF = pow(MaxMilThrust, 0.2) * 107.0;
105 if (FuelFlow_pph < IdleFF) FuelFlow_pph = IdleFF;
106 N1 = IdleN1 + throttle * N1_factor;
107 N2 = IdleN2 + throttle * N2_factor;
108 EGT_degC = TAT + 363.1 + ThrottleCmd * 357.1;
109 OilPressure_psi = N2 * 0.62;
110 OilTemp_degK += dt * 1.2;
111 if (OilTemp_degK > 366.0) OilTemp_degK = 366.0;
112 EPR = 1.0 + thrust/MaxMilThrust;
113 NozzlePosition = 1.0 - throttle;
114 if (Reversed) thrust = thrust * -0.2;
118 FuelFlow_pph = 0.000001;
120 if (N1 < (Translation->Getqbar()/10.0)) N1 = Translation->Getqbar()/10.0;
122 if (N2 < (Translation->Getqbar()/15.0)) N2 = Translation->Getqbar()/15.0;
123 EGT_degC -= (dt * 11.7);
124 if (EGT_degC < TAT) EGT_degC = TAT;
125 OilPressure_psi = N2 * 0.62;
126 OilTemp_degK -= (dt * 0.2);
127 if (OilTemp_degK < (TAT + 273.0)) OilTemp_degK = (TAT + 273.0);
131 if (AugMethod == 1) {
132 if (throttle > 0.99) {Augmentation = true;}
133 else {Augmentation = false;}
136 if ((Augmented == 1) && Augmentation) {
137 thrust = thrust * ThrustTables[2]->TotalValue();
138 FuelFlow_pph = thrust * ATSFC;
139 NozzlePosition = 1.0;
142 if ((Injected == 1) && Injection)
143 thrust = thrust * ThrustTables[3]->TotalValue();
147 return Thrust = thrust;
151 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
153 double FGSimTurbine::CalcFuelNeed(void)
155 return FuelFlow_pph /3600 * State->Getdt() * Propulsion->GetRate();
158 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
160 double FGSimTurbine::GetPowerAvailable(void) {
161 if( throttle <= 0.77 )
162 return 64.94*throttle;
164 return 217.38*throttle - 117.38;
167 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
169 void FGSimTurbine::SetDefaults(void)
171 Name = "None_Defined";
172 MaxMilThrust = 10000.0;
186 NozzlePosition = 1.0;
187 Augmentation = false;
192 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
194 bool FGSimTurbine::Load(FGConfigFile *Eng_cfg)
198 Name = Eng_cfg->GetValue("NAME");
199 cout << Name << endl;
200 Eng_cfg->GetNextConfigLine();
201 *Eng_cfg >> token >> MaxMilThrust;
202 *Eng_cfg >> token >> BypassRatio;
203 *Eng_cfg >> token >> TSFC;
204 *Eng_cfg >> token >> ATSFC;
205 *Eng_cfg >> token >> IdleN1;
206 *Eng_cfg >> token >> IdleN2;
207 *Eng_cfg >> token >> MaxN1;
208 *Eng_cfg >> token >> MaxN2;
209 *Eng_cfg >> token >> Augmented;
210 *Eng_cfg >> token >> AugMethod;
211 *Eng_cfg >> token >> Injected;
213 while( Eng_cfg->GetValue() != string("/FG_SIMTURBINE") && i < 10){
214 ThrustTables.push_back( new FGCoefficient(FDMExec) );
215 ThrustTables.back()->Load(Eng_cfg);
219 // pre-calculations and initializations
220 delay= 1.0 / (BypassRatio + 3.0);
221 N1_factor = MaxN1 - IdleN1;
222 N2_factor = MaxN2 - IdleN2;
223 OilTemp_degK = (Auxiliary->GetTotalTemperature() - 491.69) * 0.5555556 + 273.0;
224 IdleFF = pow(MaxMilThrust, 0.2) * 107.0; // just an estimate
225 AddFeedTank(EngineNumber); // engine[n] feeds from tank[n]
230 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
231 // The bitmasked value choices are as follows:
232 // unset: In this case (the default) JSBSim would only print
233 // out the normally expected messages, essentially echoing
234 // the config files as they are read. If the environment
235 // variable is not set, debug_lvl is set to 1 internally
236 // 0: This requests JSBSim not to output any messages
238 // 1: This value explicity requests the normal JSBSim
240 // 2: This value asks for a message to be printed out when
241 // a class is instantiated
242 // 4: When this value is set, a message is displayed when a
243 // FGModel object executes its Run() method
244 // 8: When this value is set, various runtime state variables
245 // are printed out periodically
246 // 16: When set various parameters are sanity checked and
247 // a message is printed out when they go out of bounds
249 void FGSimTurbine::Debug(int from)
251 if (debug_lvl <= 0) return;
253 if (debug_lvl & 1) { // Standard console startup message output
254 if (from == 0) { // Constructor
258 if (debug_lvl & 2 ) { // Instantiation/Destruction notification
259 if (from == 0) cout << "Instantiated: FGSimTurbine" << endl;
260 if (from == 1) cout << "Destroyed: FGSimTurbine" << endl;
262 if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
264 if (debug_lvl & 8 ) { // Runtime state variables
266 if (debug_lvl & 16) { // Sanity checking
268 if (debug_lvl & 64) {
269 if (from == 0) { // Constructor
270 cout << IdSrc << endl;
271 cout << IdHdr << endl;