1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6 Purpose: Encapsulates an aircraft
9 ------------- Copyright (C) 1999 Jon S. Berndt (jsb@hal-pc.org) -------------
11 This program is free software; you can redistribute it and/or modify it under
12 the terms of the GNU General Public License as published by the Free Software
13 Foundation; either version 2 of the License, or (at your option) any later
16 This program is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
18 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
21 You should have received a copy of the GNU General Public License along with
22 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
23 Place - Suite 330, Boston, MA 02111-1307, USA.
25 Further information about the GNU General Public License can also be found on
26 the world wide web at http://www.gnu.org.
28 FUNCTIONAL DESCRIPTION
29 --------------------------------------------------------------------------------
30 Models the aircraft reactions and forces. This class is instantiated by the
31 FGFDMExec class and scheduled as an FDM entry.
33 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
34 COMMENTS, REFERENCES, and NOTES
35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
37 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
39 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
42 #include <sys/types.h>
46 # include <simgear/compiler.h>
48 # ifdef SG_HAVE_STD_INCLUDES
54 # if defined (sgi) && !defined(__GNUC__)
61 #include "FGAircraft.h"
62 #include "FGMassBalance.h"
63 #include "FGInertial.h"
64 #include "FGGroundReactions.h"
65 #include "FGAerodynamics.h"
67 #include <FGFDMExec.h>
68 #include "FGPropagate.h"
69 #include <input_output/FGPropertyManager.h>
73 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
75 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
77 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
79 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
81 static const char *IdSrc = "$Id$";
82 static const char *IdHdr = ID_AIRCRAFT;
84 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
86 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
88 FGAircraft::FGAircraft(FGFDMExec* fdmex) : FGModel(fdmex)
92 HTailArea = VTailArea = 0.0;
93 HTailArm = VTailArm = 0.0;
103 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
105 FGAircraft::~FGAircraft()
111 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
113 bool FGAircraft::Run(void)
115 if (FGModel::Run()) return true;
116 if (FDMExec->Holding()) return false;
118 vForces.InitMatrix();
119 vForces += Aerodynamics->GetForces();
120 vForces += Propulsion->GetForces();
121 vForces += GroundReactions->GetForces();
123 vMoments.InitMatrix();
124 vMoments += Aerodynamics->GetMoments();
125 vMoments += Propulsion->GetMoments();
126 vMoments += GroundReactions->GetMoments();
128 // printf("%s:%i\n", __FILE__, __LINE__);
129 vBodyAccel = vForces/MassBalance->GetMass();
131 // printf("%s:%i\n", __FILE__, __LINE__);
132 vNcg = vBodyAccel/Inertial->gravity();
134 vNwcg = State->GetTb2s() * vNcg;
135 vNwcg(3) = -1*vNwcg(3) + 1;
140 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
142 double FGAircraft::GetNlf(void)
144 return -1*Aerodynamics->GetvFs(3)/MassBalance->GetWeight();
147 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
149 bool FGAircraft::Load(Element* el)
154 if (el->FindElement("wingarea"))
155 WingArea = el->FindElementValueAsNumberConvertTo("wingarea", "FT2");
156 if (el->FindElement("wingspan"))
157 WingSpan = el->FindElementValueAsNumberConvertTo("wingspan", "FT");
158 if (el->FindElement("chord"))
159 cbar = el->FindElementValueAsNumberConvertTo("chord", "FT");
160 if (el->FindElement("wing_incidence"))
161 WingIncidence = el->FindElementValueAsNumberConvertTo("wing_incidence", "DEG");
162 if (el->FindElement("htailarea"))
163 HTailArea = el->FindElementValueAsNumberConvertTo("htailarea", "FT2");
164 if (el->FindElement("htailarm"))
165 HTailArm = el->FindElementValueAsNumberConvertTo("htailarm", "FT");
166 if (el->FindElement("vtailarea"))
167 VTailArea = el->FindElementValueAsNumberConvertTo("vtailarea", "FT2");
168 if (el->FindElement("vtailarm"))
169 VTailArm = el->FindElementValueAsNumberConvertTo("vtailarm", "FT");
171 // Find all LOCATION elements that descend from this METRICS branch of the
172 // config file. This would be CG location, eyepoint, etc.
174 element = el->FindElement("location");
176 element_name = element->GetAttributeValue("name");
178 if (element_name == "AERORP") vXYZrp = element->FindElementTripletConvertTo("IN");
179 else if (element_name == "EYEPOINT") vXYZep = element->FindElementTripletConvertTo("IN");
180 else if (element_name == "VRP") vXYZvrp = element->FindElementTripletConvertTo("IN");
182 element = el->FindNextElement("location");
185 // calculate some derived parameters
187 lbarh = HTailArm/cbar;
188 lbarv = VTailArm/cbar;
189 if (WingArea != 0.0) {
190 vbarh = HTailArm*HTailArea / (cbar*WingArea);
191 vbarv = VTailArm*VTailArea / (cbar*WingArea);
200 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
202 void FGAircraft::bind(void)
204 typedef double (FGAircraft::*PMF)(int) const;
205 PropertyManager->Tie("metrics/Sw-sqft", this, &FGAircraft::GetWingArea);
206 PropertyManager->Tie("metrics/bw-ft", this, &FGAircraft::GetWingSpan);
207 PropertyManager->Tie("metrics/cbarw-ft", this, &FGAircraft::Getcbar);
208 PropertyManager->Tie("metrics/iw-deg", this, &FGAircraft::GetWingIncidence);
209 PropertyManager->Tie("metrics/Sh-sqft", this, &FGAircraft::GetHTailArea);
210 PropertyManager->Tie("metrics/lh-ft", this, &FGAircraft::GetHTailArm);
211 PropertyManager->Tie("metrics/Sv-sqft", this, &FGAircraft::GetVTailArea);
212 PropertyManager->Tie("metrics/lv-ft", this, &FGAircraft::GetVTailArm);
213 PropertyManager->Tie("metrics/lh-norm", this, &FGAircraft::Getlbarh);
214 PropertyManager->Tie("metrics/lv-norm", this, &FGAircraft::Getlbarv);
215 PropertyManager->Tie("metrics/vbarh-norm", this, &FGAircraft::Getvbarh);
216 PropertyManager->Tie("metrics/vbarv-norm", this, &FGAircraft::Getvbarv);
217 PropertyManager->Tie("moments/l-total-lbsft", this, eL, (PMF)&FGAircraft::GetMoments);
218 PropertyManager->Tie("moments/m-total-lbsft", this, eM, (PMF)&FGAircraft::GetMoments);
219 PropertyManager->Tie("moments/n-total-lbsft", this, eN, (PMF)&FGAircraft::GetMoments);
220 PropertyManager->Tie("forces/fbx-total-lbs", this, eX, (PMF)&FGAircraft::GetForces);
221 PropertyManager->Tie("forces/fby-total-lbs", this, eY, (PMF)&FGAircraft::GetForces);
222 PropertyManager->Tie("forces/fbz-total-lbs", this, eZ, (PMF)&FGAircraft::GetForces);
223 PropertyManager->Tie("metrics/aero-rp-x-in", this, eX, (PMF)&FGAircraft::GetXYZrp);
224 PropertyManager->Tie("metrics/aero-rp-y-in", this, eY, (PMF)&FGAircraft::GetXYZrp);
225 PropertyManager->Tie("metrics/aero-rp-z-in", this, eZ, (PMF)&FGAircraft::GetXYZrp);
226 PropertyManager->Tie("metrics/eyepoint-x-in", this, eX, (PMF)&FGAircraft::GetXYZep);
227 PropertyManager->Tie("metrics/eyepoint-y-in", this, eY,(PMF)&FGAircraft::GetXYZep);
228 PropertyManager->Tie("metrics/eyepoint-z-in", this, eZ, (PMF)&FGAircraft::GetXYZep);
229 PropertyManager->Tie("metrics/visualrefpoint-x-in", this, eX, (PMF)&FGAircraft::GetXYZvrp);
230 PropertyManager->Tie("metrics/visualrefpoint-y-in", this, eY, (PMF)&FGAircraft::GetXYZvrp);
231 PropertyManager->Tie("metrics/visualrefpoint-z-in", this, eZ, (PMF)&FGAircraft::GetXYZvrp);
234 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
236 void FGAircraft::unbind(void)
238 PropertyManager->Untie("metrics/Sw-sqft");
239 PropertyManager->Untie("metrics/bw-ft");
240 PropertyManager->Untie("metrics/cbarw-ft");
241 PropertyManager->Untie("metrics/iw-deg");
242 PropertyManager->Untie("metrics/Sh-sqft");
243 PropertyManager->Untie("metrics/lh-ft");
244 PropertyManager->Untie("metrics/Sv-sqft");
245 PropertyManager->Untie("metrics/lv-ft");
246 PropertyManager->Untie("metrics/lh-norm");
247 PropertyManager->Untie("metrics/lv-norm");
248 PropertyManager->Untie("metrics/vbarh-norm");
249 PropertyManager->Untie("metrics/vbarv-norm");
250 PropertyManager->Untie("moments/l-total-lbsft");
251 PropertyManager->Untie("moments/m-total-lbsft");
252 PropertyManager->Untie("moments/n-total-lbsft");
253 PropertyManager->Untie("forces/fbx-total-lbs");
254 PropertyManager->Untie("forces/fby-total-lbs");
255 PropertyManager->Untie("forces/fbz-total-lbs");
256 PropertyManager->Untie("metrics/aero-rp-x-in");
257 PropertyManager->Untie("metrics/aero-rp-y-in");
258 PropertyManager->Untie("metrics/aero-rp-z-in");
259 PropertyManager->Untie("metrics/eyepoint-x-in");
260 PropertyManager->Untie("metrics/eyepoint-y-in");
261 PropertyManager->Untie("metrics/eyepoint-z-in");
262 PropertyManager->Untie("metrics/visualrefpoint-x-in");
263 PropertyManager->Untie("metrics/visualrefpoint-y-in");
264 PropertyManager->Untie("metrics/visualrefpoint-z-in");
267 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
268 // The bitmasked value choices are as follows:
269 // unset: In this case (the default) JSBSim would only print
270 // out the normally expected messages, essentially echoing
271 // the config files as they are read. If the environment
272 // variable is not set, debug_lvl is set to 1 internally
273 // 0: This requests JSBSim not to output any messages
275 // 1: This value explicity requests the normal JSBSim
277 // 2: This value asks for a message to be printed out when
278 // a class is instantiated
279 // 4: When this value is set, a message is displayed when a
280 // FGModel object executes its Run() method
281 // 8: When this value is set, various runtime state variables
282 // are printed out periodically
283 // 16: When set various parameters are sanity checked and
284 // a message is printed out when they go out of bounds
286 void FGAircraft::Debug(int from)
288 if (debug_lvl <= 0) return;
290 if (debug_lvl & 1) { // Standard console startup message output
291 if (from == 2) { // Loading
292 cout << endl << " Aircraft Metrics:" << endl;
293 cout << " WingArea: " << WingArea << endl;
294 cout << " WingSpan: " << WingSpan << endl;
295 cout << " Incidence: " << WingIncidence << endl;
296 cout << " Chord: " << cbar << endl;
297 cout << " H. Tail Area: " << HTailArea << endl;
298 cout << " H. Tail Arm: " << HTailArm << endl;
299 cout << " V. Tail Area: " << VTailArea << endl;
300 cout << " V. Tail Arm: " << VTailArm << endl;
301 cout << " Eyepoint (x, y, z): " << vXYZep << endl;
302 cout << " Ref Pt (x, y, z): " << vXYZrp << endl;
303 cout << " Visual Ref Pt (x, y, z): " << vXYZvrp << endl;
306 if (debug_lvl & 2 ) { // Instantiation/Destruction notification
307 if (from == 0) cout << "Instantiated: FGAircraft" << endl;
308 if (from == 1) cout << "Destroyed: FGAircraft" << endl;
310 if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
312 if (debug_lvl & 8 ) { // Runtime state variables
314 if (debug_lvl & 16) { // Sanity checking
316 if (debug_lvl & 64) {
317 if (from == 0) { // Constructor
318 cout << IdSrc << endl;
319 cout << IdHdr << endl;
324 } // namespace JSBSim