1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
8 ------------- Copyright (C) 1999 Jon S. Berndt (jsb@hal-pc.org) -------------
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 --------------------------------------------------------------------------------
32 --------------------------------------------------------------------------------
34 09/03/99 JSB Changed Rocket thrust equation to correct -= Thrust instead of
35 += Thrust (thanks to Tony Peden)
37 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
39 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
42 # include <simgear/compiler.h>
43 # ifdef SG_HAVE_STD_INCLUDES
49 # if defined(sgi) && !defined(__GNUC__)
59 static const char *IdSrc = "$Id$";
60 static const char *IdHdr = ID_ENGINE;
62 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
64 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
67 FGEngine::FGEngine(FGFDMExec* exec)
70 State = FDMExec->GetState();
71 Atmosphere = FDMExec->GetAtmosphere();
72 FCS = FDMExec->GetFCS();
73 Propulsion = FDMExec->GetPropulsion();
74 Aircraft = FDMExec->GetAircraft();
75 Translation = FDMExec->GetTranslation();
76 Rotation = FDMExec->GetRotation();
77 Position = FDMExec->GetPosition();
78 Auxiliary = FDMExec->GetAuxiliary();
79 Output = FDMExec->GetOutput();
81 Mixture = 1.0; // FIXME: get actual value
83 Thrust = PctPower = 0.0;
84 Starved = Flameout = false;
86 Cranking = Starter = false;
92 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
99 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
100 // This base class function should be called from within the
101 // derived class' Calculate() function before any other calculations are done.
102 // This base class method removes fuel from the fuel tanks as appropriate,
103 // and sets the starved flag if necessary.
105 void FGEngine::ConsumeFuel(void)
107 double Fshortage, Oshortage;
110 if (TrimMode) return;
111 Fshortage = Oshortage = 0.0;
112 for (unsigned int i=0; i<SourceTanks.size(); i++) {
113 Tank = Propulsion->GetTank(i);
114 if (Tank->GetType() == FGTank::ttFUEL) {
115 Fshortage += Tank->Reduce(CalcFuelNeed()/Propulsion->GetnumSelectedFuelTanks());
117 Oshortage += Tank->Reduce(CalcOxidizerNeed()/Propulsion->GetnumSelectedOxiTanks());
121 if (Fshortage < 0.00 || Oshortage < 0.00) Starved = true;
122 else Starved = false;
125 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
127 double FGEngine::CalcFuelNeed(void) {
128 FuelNeed = SLFuelFlowMax*PctPower*State->Getdt()*Propulsion->GetRate();
132 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
134 double FGEngine::CalcOxidizerNeed(void) {
135 OxidizerNeed = SLOxiFlowMax*PctPower*State->Getdt()*Propulsion->GetRate();
139 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
141 void FGEngine::SetPlacement(double x, double y, double z, double pitch, double yaw) {
149 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
151 void FGEngine::AddFeedTank(int tkID)
153 SourceTanks.push_back(tkID);
156 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
157 // The bitmasked value choices are as follows:
158 // unset: In this case (the default) JSBSim would only print
159 // out the normally expected messages, essentially echoing
160 // the config files as they are read. If the environment
161 // variable is not set, debug_lvl is set to 1 internally
162 // 0: This requests JSBSim not to output any messages
164 // 1: This value explicity requests the normal JSBSim
166 // 2: This value asks for a message to be printed out when
167 // a class is instantiated
168 // 4: When this value is set, a message is displayed when a
169 // FGModel object executes its Run() method
170 // 8: When this value is set, various runtime state variables
171 // are printed out periodically
172 // 16: When set various parameters are sanity checked and
173 // a message is printed out when they go out of bounds
175 void FGEngine::Debug(int from)
177 if (debug_lvl <= 0) return;
179 if (debug_lvl & 1) { // Standard console startup message output
180 if (from == 0) { // Constructor
184 if (debug_lvl & 2 ) { // Instantiation/Destruction notification
185 if (from == 0) cout << "Instantiated: FGEngine" << endl;
186 if (from == 1) cout << "Destroyed: FGEngine" << endl;
188 if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
190 if (debug_lvl & 8 ) { // Runtime state variables
192 if (debug_lvl & 16) { // Sanity checking