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1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2  
3  Module:       FGEngine.cpp
4  Author:       Jon Berndt
5  Date started: 01/21/99
6  Called by:    FGAircraft
7  
8  ------------- Copyright (C) 1999  Jon S. Berndt (jsb@hal-pc.org) -------------
9  
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
13  version.
14  
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
18  details.
19  
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.
23  
24  Further information about the GNU General Public License can also be found on
25  the world wide web at http://www.gnu.org.
26  
27 FUNCTIONAL DESCRIPTION
28 --------------------------------------------------------------------------------
29 See header file.
30  
31 HISTORY
32 --------------------------------------------------------------------------------
33 01/21/99   JSB   Created
34 09/03/99   JSB   Changed Rocket thrust equation to correct -= Thrust instead of
35                  += Thrust (thanks to Tony Peden)
36  
37 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
38 INCLUDES
39 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
40
41 #ifdef FGFS
42 #  include <simgear/compiler.h>
43 #  ifdef SG_HAVE_STD_INCLUDES
44 #    include <fstream>
45 #  else
46 #    include <fstream.h>
47 #  endif
48 #else
49 #  if defined(sgi) && !defined(__GNUC__)
50 #    include <fstream.h>
51 #  else
52 #    include <fstream>
53 #  endif
54 #endif
55
56 #include "FGEngine.h"
57 #include "FGTank.h"
58
59 namespace JSBSim {
60
61 static const char *IdSrc = "$Id$";
62 static const char *IdHdr = ID_ENGINE;
63
64 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
65 CLASS IMPLEMENTATION
66 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
67
68
69 FGEngine::FGEngine(FGFDMExec* exec)
70   : Name(""),
71     Type(etUnknown),
72     X(0), Y(0), Z(0),
73     EnginePitch(0), EngineYaw(0),
74     SLFuelFlowMax(0), SLOxiFlowMax(0),
75     MaxThrottle(1.0), MinThrottle(0.0),
76     Thrust(0.0),
77     Throttle(0.0),
78     Mixture(1.0),
79     Magnetos(0),
80     Starter(false),
81     FuelNeed(0.0), OxidizerNeed(0.0),
82     Starved(false), Flameout(false), Running(false), Cranking(false),
83     Augmentation(false), Injection(false), Ignition(false),
84     Reversed(false), Cutoff(true), Nitrous(false),
85     PctPower(0.0),
86     EngineNumber(-1),
87     TrimMode(false),
88     FuelFlow_gph(0.0),
89     ManifoldPressure_inHg(0.0),
90     ExhaustGasTemp_degK(0.0),
91     CylinderHeadTemp_degK(0.0),
92     OilPressure_psi(0.0),
93     OilTemp_degK(0.0),
94     FDMExec(exec),
95     State(FDMExec->GetState()),
96     Atmosphere(FDMExec->GetAtmosphere()),
97     FCS(FDMExec->GetFCS()),
98     Propulsion(FDMExec->GetPropulsion()),
99     Aircraft(FDMExec->GetAircraft()),
100     Translation(FDMExec->GetTranslation()),
101     Rotation(FDMExec->GetRotation()),
102     Position(FDMExec->GetPosition()),
103     Auxiliary(FDMExec->GetAuxiliary()),
104     Output(FDMExec->GetOutput())
105 {
106   Debug(0);
107 }
108
109 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
110
111 FGEngine::~FGEngine()
112 {
113   Debug(1);
114 }
115
116 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
117 // This base class function should be called from within the
118 // derived class' Calculate() function before any other calculations are done.
119 // This base class method removes fuel from the fuel tanks as appropriate,
120 // and sets the starved flag if necessary.
121
122 void FGEngine::ConsumeFuel(void)
123 {
124   double Fshortage, Oshortage;
125   FGTank* Tank;
126
127   if (TrimMode) return;
128   Fshortage = Oshortage = 0.0;
129   for (unsigned int i=0; i<SourceTanks.size(); i++) {
130     Tank = Propulsion->GetTank(i);
131     if (Tank->GetType() == FGTank::ttFUEL) {
132       Fshortage += Tank->Reduce(CalcFuelNeed()/Propulsion->GetnumSelectedFuelTanks());
133     } else {
134       Oshortage += Tank->Reduce(CalcOxidizerNeed()/Propulsion->GetnumSelectedOxiTanks());
135     }
136   }
137
138   if (Fshortage < 0.00 || Oshortage < 0.00) Starved = true;
139   else Starved = false;
140 }
141
142 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
143
144 double FGEngine::CalcFuelNeed(void) {
145   FuelNeed = SLFuelFlowMax*PctPower*State->Getdt()*Propulsion->GetRate();
146   return FuelNeed;
147 }
148
149 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
150
151 double FGEngine::CalcOxidizerNeed(void) {
152   OxidizerNeed = SLOxiFlowMax*PctPower*State->Getdt()*Propulsion->GetRate();
153   return OxidizerNeed;
154 }
155
156 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
157
158 void FGEngine::SetPlacement(double x, double y, double z, double pitch, double yaw) {
159   X = x;
160   Y = y;
161   Z = z;
162   EnginePitch = pitch;
163   EngineYaw = yaw;
164 }
165
166 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
167
168 void FGEngine::AddFeedTank(int tkID)
169 {
170   SourceTanks.push_back(tkID);
171 }
172
173 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
174 //    The bitmasked value choices are as follows:
175 //    unset: In this case (the default) JSBSim would only print
176 //       out the normally expected messages, essentially echoing
177 //       the config files as they are read. If the environment
178 //       variable is not set, debug_lvl is set to 1 internally
179 //    0: This requests JSBSim not to output any messages
180 //       whatsoever.
181 //    1: This value explicity requests the normal JSBSim
182 //       startup messages
183 //    2: This value asks for a message to be printed out when
184 //       a class is instantiated
185 //    4: When this value is set, a message is displayed when a
186 //       FGModel object executes its Run() method
187 //    8: When this value is set, various runtime state variables
188 //       are printed out periodically
189 //    16: When set various parameters are sanity checked and
190 //       a message is printed out when they go out of bounds
191
192 void FGEngine::Debug(int from)
193 {
194   if (debug_lvl <= 0) return;
195
196   if (debug_lvl & 1) { // Standard console startup message output
197     if (from == 0) { // Constructor
198
199     }
200   }
201   if (debug_lvl & 2 ) { // Instantiation/Destruction notification
202     if (from == 0) cout << "Instantiated: FGEngine" << endl;
203     if (from == 1) cout << "Destroyed:    FGEngine" << endl;
204   }
205   if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
206   }
207   if (debug_lvl & 8 ) { // Runtime state variables
208   }
209   if (debug_lvl & 16) { // Sanity checking
210   }
211   if (debug_lvl & 64) {
212     if (from == 0) { // Constructor
213       cout << IdSrc << endl;
214       cout << IdHdr << endl;
215     }
216   }
217 }
218 }