1 /*******************************************************************************
6 Called by: FGFDMExec and accessed by all models.
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 --------------------------------------------------------------------------------
35 ********************************************************************************
37 *******************************************************************************/
40 # include <simgear/compiler.h>
41 # ifdef FG_HAVE_STD_INCLUDES
51 #include "FGFDMExec.h"
52 #include "FGAtmosphere.h"
54 #include "FGAircraft.h"
55 #include "FGTranslation.h"
56 #include "FGRotation.h"
57 #include "FGPosition.h"
58 #include "FGAuxiliary.h"
61 /*******************************************************************************
62 ************************************ CODE **************************************
63 *******************************************************************************/
66 FGState::FGState(FGFDMExec* fdex) : mTb2l(3,3),
74 latitude = longitude = 0.0;
82 coeffdef["FG_QBAR"] = 1 ;
83 coeffdef["FG_WINGAREA"] = 2 ;
84 coeffdef["FG_WINGSPAN"] = 4 ;
85 coeffdef["FG_CBAR"] = 8 ;
86 coeffdef["FG_ALPHA"] = 16 ;
87 coeffdef["FG_ALPHADOT"] = 32 ;
88 coeffdef["FG_BETA"] = 64 ;
89 coeffdef["FG_BETADOT"] = 128 ;
90 coeffdef["FG_PITCHRATE"] = 256 ;
91 coeffdef["FG_ROLLRATE"] = 512 ;
92 coeffdef["FG_YAWRATE"] = 1024 ;
93 coeffdef["FG_MACH"] = 2048 ;
94 coeffdef["FG_ALTITUDE"] = 4096 ;
95 coeffdef["FG_BI2VEL"] = 8192 ;
96 coeffdef["FG_CI2VEL"] = 16384 ;
97 coeffdef["FG_ELEVATOR_POS"] = 32768L ;
98 coeffdef["FG_AILERON_POS"] = 65536L ;
99 coeffdef["FG_RUDDER_POS"] = 131072L ;
100 coeffdef["FG_SPDBRAKE_POS"] = 262144L ;
101 coeffdef["FG_SPOILERS_POS"] = 524288L ;
102 coeffdef["FG_FLAPS_POS"] = 1048576L ;
103 coeffdef["FG_ELEVATOR_CMD"] = 2097152L ;
104 coeffdef["FG_AILERON_CMD"] = 4194304L ;
105 coeffdef["FG_RUDDER_CMD"] = 8388608L ;
106 coeffdef["FG_SPDBRAKE_CMD"] = 16777216L ;
107 coeffdef["FG_SPOILERS_CMD"] = 33554432L ;
108 coeffdef["FG_FLAPS_CMD"] = 67108864L ;
109 coeffdef["FG_SPARE3"] = 134217728L ;
110 coeffdef["FG_SPARE4"] = 268435456L ;
111 coeffdef["FG_SPARE5"] = 536870912L ;
112 coeffdef["FG_SPARE6"] = 1073741824L ;
115 /******************************************************************************/
117 FGState::~FGState(void)
121 //***************************************************************************
123 // Reset: Assume all angles READ FROM FILE IN DEGREES !!
126 bool FGState::Reset(string path, string acname, string fname)
132 resetDef = path + "/" + acname + "/" + fname;
134 ifstream resetfile(resetDef.c_str());
140 resetfile >> latitude;
141 resetfile >> longitude;
148 Initialize(U, V, W, phi*DEGTORAD, tht*DEGTORAD, psi*DEGTORAD,
149 latitude*DEGTORAD, longitude*DEGTORAD, h);
153 cerr << "Unable to load reset file " << fname << endl;
158 //***************************************************************************
160 // Initialize: Assume all angles GIVEN IN RADIANS !!
163 void FGState::Initialize(float U, float V, float W,
164 float phi, float tht, float psi,
165 float Latitude, float Longitude, float H)
167 FGColumnVector vUVW(3);
168 FGColumnVector vEuler(3);
169 float alpha, beta, gamma;
172 longitude = Longitude;
174 FDMExec->GetAtmosphere()->Run();
178 alpha = U*U > 0.0 ? atan2(W, U) : 0.0;
182 beta = U*U+W*W > 0.0 ? atan2(V, (fabs(U)/U)*sqrt(U*U + W*W)) : 0.0;
187 FDMExec->GetTranslation()->SetUVW(vUVW);
188 vEuler << phi << tht << psi;
189 FDMExec->GetRotation()->SetEuler(vEuler);
190 FDMExec->GetTranslation()->SetABG(alpha, beta, gamma);
192 Vt = sqrt(U*U + V*V + W*W);
193 qbar = 0.5*(U*U + V*V + W*W)*FDMExec->GetAtmosphere()->GetDensity();
195 InitMatrices(phi, tht, psi);
198 /******************************************************************************/
200 void FGState::Initialize(FGInitialCondition *FGIC)
206 latitude = FGIC->GetLatitudeRadIC();
207 longitude = FGIC->GetLongitudeRadIC();
208 h = FGIC->GetAltitudeFtIC();
209 U = FGIC->GetUBodyFpsIC();
210 V = FGIC->GetVBodyFpsIC();
211 W = FGIC->GetWBodyFpsIC();
212 tht = FGIC->GetThetaRadIC();
213 phi = FGIC->GetPhiRadIC();
214 psi = FGIC->GetPsiRadIC();
216 Initialize(U, V, W, phi, tht, psi, latitude, longitude, h);
219 /******************************************************************************/
221 bool FGState::StoreData(string fname)
223 ofstream datafile(fname.c_str());
226 datafile << (FDMExec->GetTranslation()->GetUVW())(1);
227 datafile << (FDMExec->GetTranslation()->GetUVW())(2);
228 datafile << (FDMExec->GetTranslation()->GetUVW())(3);
229 datafile << latitude;
230 datafile << longitude;
231 datafile << (FDMExec->GetRotation()->GetEuler())(1);
232 datafile << (FDMExec->GetRotation()->GetEuler())(2);
233 datafile << (FDMExec->GetRotation()->GetEuler())(3);
238 cerr << "Could not open dump file " << fname << endl;
243 /******************************************************************************/
245 float FGState::GetParameter(string val_string)
247 return GetParameter(coeffdef[val_string]);
250 /******************************************************************************/
252 int FGState::GetParameterIndex(string val_string)
254 return coeffdef[val_string];
257 /******************************************************************************/
259 // NEED WORK BELOW TO ADD NEW PARAMETERS !!!
261 float FGState::GetParameter(int val_idx)
267 return FDMExec->GetAircraft()->GetWingArea();
269 return FDMExec->GetAircraft()->GetWingSpan();
271 return FDMExec->GetAircraft()->Getcbar();
273 return FDMExec->GetTranslation()->Getalpha();
277 return FDMExec->GetTranslation()->Getbeta();
281 return (FDMExec->GetRotation()->GetPQR())(2);
283 return (FDMExec->GetRotation()->GetPQR())(1);
285 return (FDMExec->GetRotation()->GetPQR())(3);
286 case FG_ELEVATOR_POS:
287 return FDMExec->GetFCS()->GetDePos();
289 return FDMExec->GetFCS()->GetDaPos();
291 return FDMExec->GetFCS()->GetDrPos();
292 case FG_SPDBRAKE_POS:
293 return FDMExec->GetFCS()->GetDsbPos();
294 case FG_SPOILERS_POS:
295 return FDMExec->GetFCS()->GetDspPos();
297 return FDMExec->GetFCS()->GetDfPos();
298 case FG_ELEVATOR_CMD:
299 return FDMExec->GetFCS()->GetDeCmd();
301 return FDMExec->GetFCS()->GetDaCmd();
303 return FDMExec->GetFCS()->GetDrCmd();
304 case FG_SPDBRAKE_CMD:
305 return FDMExec->GetFCS()->GetDsbCmd();
306 case FG_SPOILERS_CMD:
307 return FDMExec->GetFCS()->GetDspCmd();
309 return FDMExec->GetFCS()->GetDfCmd();
315 return FDMExec->GetAircraft()->GetWingSpan()/(2.0 * GetVt());
317 return FDMExec->GetAircraft()->Getcbar()/(2.0 * GetVt());
322 /******************************************************************************/
324 void FGState::SetParameter(int val_idx, float val)
327 case FG_ELEVATOR_POS:
328 FDMExec->GetFCS()->SetDePos(val);
331 FDMExec->GetFCS()->SetDaPos(val);
334 FDMExec->GetFCS()->SetDrPos(val);
336 case FG_SPDBRAKE_POS:
337 FDMExec->GetFCS()->SetDrPos(val);
339 case FG_SPOILERS_POS:
340 FDMExec->GetFCS()->SetDrPos(val);
343 FDMExec->GetFCS()->SetDrPos(val);
348 /******************************************************************************/
350 void FGState::InitMatrices(float phi, float tht, float psi)
352 float thtd2, psid2, phid2;
353 float Sthtd2, Spsid2, Sphid2;
354 float Cthtd2, Cpsid2, Cphid2;
372 Cphid2Cthtd2 = Cphid2*Cthtd2;
373 Cphid2Sthtd2 = Cphid2*Sthtd2;
374 Sphid2Sthtd2 = Sphid2*Sthtd2;
375 Sphid2Cthtd2 = Sphid2*Cthtd2;
377 vQtrn(1) = Cphid2Cthtd2*Cpsid2 + Sphid2Sthtd2*Spsid2;
378 vQtrn(2) = Sphid2Cthtd2*Cpsid2 - Cphid2Sthtd2*Spsid2;
379 vQtrn(3) = Cphid2Sthtd2*Cpsid2 + Sphid2Cthtd2*Spsid2;
380 vQtrn(4) = Cphid2Cthtd2*Spsid2 - Sphid2Sthtd2*Cpsid2;
385 /******************************************************************************/
387 void FGState::CalcMatrices(void)
389 float Q0Q0, Q1Q1, Q2Q2, Q3Q3;
390 float Q0Q1, Q0Q2, Q0Q3, Q1Q2;
393 Q0Q0 = vQtrn(1)*vQtrn(1);
394 Q1Q1 = vQtrn(2)*vQtrn(2);
395 Q2Q2 = vQtrn(3)*vQtrn(3);
396 Q3Q3 = vQtrn(4)*vQtrn(4);
397 Q0Q1 = vQtrn(1)*vQtrn(2);
398 Q0Q2 = vQtrn(1)*vQtrn(3);
399 Q0Q3 = vQtrn(1)*vQtrn(4);
400 Q1Q2 = vQtrn(2)*vQtrn(3);
401 Q1Q3 = vQtrn(2)*vQtrn(4);
402 Q2Q3 = vQtrn(3)*vQtrn(4);
404 mTb2l(1,1) = Q0Q0 + Q1Q1 - Q2Q2 - Q3Q3;
405 mTb2l(1,2) = 2*(Q1Q2 + Q0Q3);
406 mTb2l(1,3) = 2*(Q1Q3 - Q0Q2);
407 mTb2l(2,1) = 2*(Q1Q2 - Q0Q3);
408 mTb2l(2,2) = Q0Q0 - Q1Q1 + Q2Q2 - Q3Q3;
409 mTb2l(2,3) = 2*(Q2Q3 + Q0Q1);
410 mTb2l(3,1) = 2*(Q1Q3 + Q0Q2);
411 mTb2l(3,2) = 2*(Q2Q3 - Q0Q1);
412 mTb2l(3,3) = Q0Q0 - Q1Q1 - Q2Q2 + Q3Q3;
418 /******************************************************************************/
420 void FGState::IntegrateQuat(FGColumnVector vPQR, int rate)
422 static FGColumnVector vlastQdot(4);
423 static FGColumnVector vQdot(4);
425 vQdot(1) = -0.5*(vQtrn(2)*vPQR(eP) + vQtrn(3)*vPQR(eQ) + vQtrn(4)*vPQR(eR));
426 vQdot(2) = 0.5*(vQtrn(1)*vPQR(eP) + vQtrn(3)*vPQR(eR) - vQtrn(4)*vPQR(eQ));
427 vQdot(3) = 0.5*(vQtrn(1)*vPQR(eQ) + vQtrn(4)*vPQR(eP) - vQtrn(2)*vPQR(eR));
428 vQdot(4) = 0.5*(vQtrn(1)*vPQR(eR) + vQtrn(2)*vPQR(eQ) - vQtrn(3)*vPQR(eP));
430 vQtrn += 0.5*dt*rate*(vlastQdot + vQdot);
437 /******************************************************************************/
439 FGColumnVector FGState::CalcEuler(void)
441 static FGColumnVector vEuler(3);
443 if (mTb2l(3,3) == 0) vEuler(ePhi) = 0.0;
444 else vEuler(ePhi) = atan2(mTb2l(2,3), mTb2l(3,3));
446 vEuler(eTht) = asin(-mTb2l(1,3));
448 if (mTb2l(1,1) == 0.0) vEuler(ePsi) = 0.0;
449 else vEuler(ePsi) = atan2(mTb2l(1,2), mTb2l(1,1));
451 if (vEuler(ePsi) < 0.0) vEuler(ePsi) += 2*M_PI;
456 /******************************************************************************/
458 FGMatrix FGState::GetTs2b(float alpha, float beta)
460 float ca, cb, sa, sb;
480 /******************************************************************************/