1 // JSBsim.cxx -- interface to the JSBsim flight model
3 // Written by Curtis Olson, started February 1999.
5 // Copyright (C) 1999 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <simgear/compiler.h>
26 #ifdef SG_MATH_EXCEPTION_CLASH
32 #include <simgear/constants.h>
33 #include <simgear/debug/logstream.hxx>
34 #include <simgear/math/sg_geodesy.hxx>
35 #include <simgear/misc/sg_path.hxx>
37 #include <Scenery/scenery.hxx>
39 #include <Aircraft/aircraft.hxx>
40 #include <Controls/controls.hxx>
41 #include <Main/globals.hxx>
42 #include <Main/fg_props.hxx>
44 #include <FDM/JSBSim/FGFDMExec.h>
45 #include <FDM/JSBSim/FGAircraft.h>
46 #include <FDM/JSBSim/FGFCS.h>
47 #include <FDM/JSBSim/FGPosition.h>
48 #include <FDM/JSBSim/FGRotation.h>
49 #include <FDM/JSBSim/FGState.h>
50 #include <FDM/JSBSim/FGTranslation.h>
51 #include <FDM/JSBSim/FGAuxiliary.h>
52 #include <FDM/JSBSim/FGInitialCondition.h>
53 #include <FDM/JSBSim/FGTrim.h>
54 #include <FDM/JSBSim/FGAtmosphere.h>
55 #include <FDM/JSBSim/FGMassBalance.h>
56 #include <FDM/JSBSim/FGAerodynamics.h>
57 #include <FDM/JSBSim/FGLGear.h>
60 /******************************************************************************/
62 FGJSBsim::FGJSBsim( double dt )
67 fdmex = new FGFDMExec;
69 State = fdmex->GetState();
70 Atmosphere = fdmex->GetAtmosphere();
71 FCS = fdmex->GetFCS();
72 MassBalance = fdmex->GetMassBalance();
73 Propulsion = fdmex->GetPropulsion();
74 Aircraft = fdmex->GetAircraft();
75 Translation = fdmex->GetTranslation();
76 Rotation = fdmex->GetRotation();
77 Position = fdmex->GetPosition();
78 Auxiliary = fdmex->GetAuxiliary();
79 Aerodynamics = fdmex->GetAerodynamics();
80 GroundReactions = fdmex->GetGroundReactions();
83 Atmosphere->UseInternal();
85 fgic=new FGInitialCondition(fdmex);
88 SGPath aircraft_path( globals->get_fg_root() );
89 aircraft_path.append( "Aircraft" );
91 SGPath engine_path( globals->get_fg_root() );
92 engine_path.append( "Engine" );
96 result = fdmex->LoadModel( aircraft_path.str(),
98 fgGetString("/sim/aero") );
101 SG_LOG( SG_FLIGHT, SG_INFO, " loaded aero.");
103 SG_LOG( SG_FLIGHT, SG_INFO,
104 " aero does not exist (you may have mis-typed the name).");
108 SG_LOG( SG_FLIGHT, SG_INFO, "" );
109 SG_LOG( SG_FLIGHT, SG_INFO, "" );
110 SG_LOG( SG_FLIGHT, SG_INFO, "After loading aero definition file ..." );
112 int Neng = Propulsion->GetNumEngines();
113 SG_LOG( SG_FLIGHT, SG_INFO, "num engines = " << Neng );
115 if ( GroundReactions->GetNumGearUnits() <= 0 ) {
116 SG_LOG( SG_FLIGHT, SG_ALERT, "num gear units = "
117 << GroundReactions->GetNumGearUnits() );
118 SG_LOG( SG_FLIGHT, SG_ALERT, "This is a very bad thing because with 0 gear units, the ground trimming");
119 SG_LOG( SG_FLIGHT, SG_ALERT, "routine (coming up later in the code) will core dump.");
120 SG_LOG( SG_FLIGHT, SG_ALERT, "Halting the sim now, and hoping a solution will present itself soon!");
127 // Set initial fuel levels if provided.
128 for (unsigned int i = 0; i < Propulsion->GetNumTanks(); i++) {
129 SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
130 if (node->getChild("level-gal_us", 0, false) != 0)
131 Propulsion->GetTank(i)
132 ->SetContents(node->getDoubleValue("level-gal_us") * 6.6);
135 fgSetDouble("/fdm/trim/pitch-trim", FCS->GetPitchTrimCmd());
136 fgSetDouble("/fdm/trim/throttle", FCS->GetThrottleCmd(0));
137 fgSetDouble("/fdm/trim/aileron", FCS->GetDaCmd());
138 fgSetDouble("/fdm/trim/rudder", FCS->GetDrCmd());
140 startup_trim = fgGetNode("/sim/startup/trim", true);
142 trimmed = fgGetNode("/fdm/trim/trimmed", true);
143 trimmed->setBoolValue(false);
145 pitch_trim = fgGetNode("/fdm/trim/pitch-trim", true );
146 throttle_trim = fgGetNode("/fdm/trim/throttle", true );
147 aileron_trim = fgGetNode("/fdm/trim/aileron", true );
148 rudder_trim = fgGetNode("/fdm/trim/rudder", true );
151 stall_warning = fgGetNode("/sim/aero/alarms/stall-warning",true);
152 stall_warning->setDoubleValue(0);
155 /******************************************************************************/
156 FGJSBsim::~FGJSBsim(void) {
158 delete fdmex; fdmex=NULL;
159 delete fgic; fgic=NULL;
163 /******************************************************************************/
165 // Initialize the JSBsim flight model, dt is the time increment for
166 // each subsequent iteration through the EOM
168 void FGJSBsim::init() {
170 SG_LOG( SG_FLIGHT, SG_INFO, "Starting and initializing JSBsim" );
172 // Explicitly call the superclass's
173 // init method first.
176 fdmex->GetState()->Initialize(fgic);
177 fdmex->RunIC(fgic); //loop JSBSim once w/o integrating
178 // fdmex->Run(); //loop JSBSim once
179 copy_from_JSBsim(); //update the bus
181 SG_LOG( SG_FLIGHT, SG_INFO, " Initialized JSBSim with:" );
183 switch(fgic->GetSpeedSet()) {
185 SG_LOG(SG_FLIGHT,SG_INFO, " Vn,Ve,Vd= "
186 << Position->GetVn() << ", "
187 << Position->GetVe() << ", "
188 << Position->GetVd() << " ft/s");
191 SG_LOG(SG_FLIGHT,SG_INFO, " U,V,W= "
192 << Translation->GetUVW(1) << ", "
193 << Translation->GetUVW(2) << ", "
194 << Translation->GetUVW(3) << " ft/s");
197 SG_LOG(SG_FLIGHT,SG_INFO, " Mach: "
198 << Translation->GetMach() );
202 SG_LOG(SG_FLIGHT,SG_INFO, " Indicated Airspeed: "
203 << Auxiliary->GetVcalibratedKTS() << " knots" );
207 stall_warning->setDoubleValue(0);
209 SG_LOG( SG_FLIGHT, SG_INFO, " Bank Angle: "
210 << Rotation->Getphi()*RADTODEG << " deg" );
211 SG_LOG( SG_FLIGHT, SG_INFO, " Pitch Angle: "
212 << Rotation->Gettht()*RADTODEG << " deg" );
213 SG_LOG( SG_FLIGHT, SG_INFO, " True Heading: "
214 << Rotation->Getpsi()*RADTODEG << " deg" );
215 SG_LOG( SG_FLIGHT, SG_INFO, " Latitude: "
216 << Position->GetLatitude() << " deg" );
217 SG_LOG( SG_FLIGHT, SG_INFO, " Longitude: "
218 << Position->GetLongitude() << " deg" );
219 SG_LOG( SG_FLIGHT, SG_INFO, " Altitude: "
220 << Position->Geth() << " feet" );
221 SG_LOG( SG_FLIGHT, SG_INFO, " loaded initial conditions" );
223 SG_LOG( SG_FLIGHT, SG_INFO, " set dt" );
225 SG_LOG( SG_FLIGHT, SG_INFO, "Finished initializing JSBSim" );
227 SG_LOG( SG_FLIGHT, SG_INFO, "FGControls::get_gear_down()= " <<
228 globals->get_controls()->get_gear_down() );
234 /******************************************************************************/
236 // Run an iteration of the EOM (equations of motion)
239 FGJSBsim::update( int multiloop ) {
243 // double save_alt = 0.0;
247 trimmed->setBoolValue(false);
250 if ( startup_trim->getBoolValue() ) {
253 fdmex->RunIC(fgic); //apply any changes made through the set_ functions
258 for ( i=0; i < multiloop; i++ ) {
262 FGJSBBase::Message* msg;
263 while (fdmex->ReadMessage()) {
264 msg = fdmex->ProcessMessage();
266 case FGJSBBase::Message::eText:
267 SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text );
269 case FGJSBBase::Message::eBool:
270 SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->bVal );
272 case FGJSBBase::Message::eInteger:
273 SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->iVal );
275 case FGJSBBase::Message::eDouble:
276 SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->dVal );
279 SG_LOG( SG_FLIGHT, SG_INFO, "Unrecognized message type." );
284 // translate JSBsim back to FG structure so that the
285 // autopilot (and the rest of the sim can use the updated values
289 /******************************************************************************/
291 // Convert from the FGInterface struct to the JSBsim generic_ struct
293 bool FGJSBsim::copy_to_JSBsim() {
296 // copy control positions into the JSBsim structure
298 FCS->SetDaCmd( globals->get_controls()->get_aileron());
299 FCS->SetRollTrimCmd( globals->get_controls()->get_aileron_trim() );
300 FCS->SetDeCmd( globals->get_controls()->get_elevator());
301 FCS->SetPitchTrimCmd( globals->get_controls()->get_elevator_trim() );
302 FCS->SetDrCmd( -globals->get_controls()->get_rudder() );
303 FCS->SetYawTrimCmd( -globals->get_controls()->get_rudder_trim() );
304 FCS->SetDfCmd( globals->get_controls()->get_flaps() );
305 FCS->SetDsbCmd( 0.0 ); //speedbrakes
306 FCS->SetDspCmd( 0.0 ); //spoilers
307 FCS->SetLBrake( globals->get_controls()->get_brake( 0 ) );
308 FCS->SetRBrake( globals->get_controls()->get_brake( 1 ) );
309 FCS->SetCBrake( globals->get_controls()->get_brake( 2 ) );
310 FCS->SetGearCmd( globals->get_controls()->get_gear_down());
311 for (i = 0; i < Propulsion->GetNumEngines(); i++) {
312 FGEngine * eng = Propulsion->GetEngine(i);
313 SGPropertyNode * node = fgGetNode("engines/engine", i, true);
314 FCS->SetThrottleCmd(i, globals->get_controls()->get_throttle(i));
315 FCS->SetMixtureCmd(i, globals->get_controls()->get_mixture(i));
316 FCS->SetPropAdvanceCmd(i, globals->get_controls()->get_prop_advance(i));
317 Propulsion->GetThruster(i)->SetRPM(node->getDoubleValue("rpm"));
318 eng->SetMagnetos( globals->get_controls()->get_magnetos(i) );
319 eng->SetStarter( globals->get_controls()->get_starter(i) );
322 Position->SetSeaLevelRadius( get_Sea_level_radius() );
323 Position->SetRunwayRadius( scenery.get_cur_elev()*SG_METER_TO_FEET
324 + get_Sea_level_radius() );
326 Atmosphere->SetExTemperature(get_Static_temperature());
327 Atmosphere->SetExPressure(get_Static_pressure());
328 Atmosphere->SetExDensity(get_Density());
329 Atmosphere->SetWindNED(get_V_north_airmass(),
330 get_V_east_airmass(),
331 get_V_down_airmass());
332 // SG_LOG(SG_FLIGHT,SG_INFO, "Wind NED: "
333 // << get_V_north_airmass() << ", "
334 // << get_V_east_airmass() << ", "
335 // << get_V_down_airmass() );
337 for (i = 0; i < Propulsion->GetNumTanks(); i++) {
338 SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
339 FGTank * tank = Propulsion->GetTank(i);
340 tank->SetContents(node->getDoubleValue("level-gal_us") * 6.6);
341 // tank->SetContents(node->getDoubleValue("level-lb"));
347 /******************************************************************************/
349 // Convert from the JSBsim generic_ struct to the FGInterface struct
351 bool FGJSBsim::copy_from_JSBsim() {
354 _set_Inertias( MassBalance->GetMass(),
355 MassBalance->GetIxx(),
356 MassBalance->GetIyy(),
357 MassBalance->GetIzz(),
358 MassBalance->GetIxz() );
360 _set_CG_Position( MassBalance->GetXYZcg(1),
361 MassBalance->GetXYZcg(2),
362 MassBalance->GetXYZcg(3) );
364 _set_Accels_Body( Aircraft->GetBodyAccel()(1),
365 Aircraft->GetBodyAccel()(2),
366 Aircraft->GetBodyAccel()(3) );
368 //_set_Accels_CG_Body( Aircraft->GetBodyAccel()(1),
369 // Aircraft->GetBodyAccel()(2),
370 // Aircraft->GetBodyAccel()(3) );
372 _set_Accels_CG_Body_N ( Aircraft->GetNcg()(1),
373 Aircraft->GetNcg()(2),
374 Aircraft->GetNcg()(3) );
376 _set_Accels_Pilot_Body( Auxiliary->GetPilotAccel()(1),
377 Auxiliary->GetPilotAccel()(2),
378 Auxiliary->GetPilotAccel()(3) );
380 // _set_Accels_Pilot_Body_N( Auxiliary->GetPilotAccel()(1)/32.1739,
381 // Auxiliary->GetNpilot(2)/32.1739,
382 // Auxiliary->GetNpilot(3)/32.1739 );
384 _set_Nlf( Aircraft->GetNlf() );
388 _set_Velocities_Local( Position->GetVn(),
392 _set_Velocities_Wind_Body( Translation->GetUVW(1),
393 Translation->GetUVW(2),
394 Translation->GetUVW(3) );
396 _set_V_rel_wind( Translation->GetVt() );
398 _set_V_equiv_kts( Auxiliary->GetVequivalentKTS() );
400 // _set_V_calibrated( Auxiliary->GetVcalibratedFPS() );
402 _set_V_calibrated_kts( Auxiliary->GetVcalibratedKTS() );
404 _set_V_ground_speed( Position->GetVground() );
406 _set_Omega_Body( Rotation->GetPQR(1),
408 Rotation->GetPQR(3) );
410 _set_Euler_Rates( Rotation->GetEulerRates(1),
411 Rotation->GetEulerRates(2),
412 Rotation->GetEulerRates(3) );
414 _set_Geocentric_Rates(Position->GetLatitudeDot(),
415 Position->GetLongitudeDot(),
416 Position->Gethdot() );
418 _set_Mach_number( Translation->GetMach() );
421 _updateGeocentricPosition( Position->GetLatitude(),
422 Position->GetLongitude(),
425 _set_Altitude_AGL( Position->GetDistanceAGL() );
427 _set_Euler_Angles( Rotation->Getphi(),
429 Rotation->Getpsi() );
431 _set_Alpha( Translation->Getalpha() );
432 _set_Beta( Translation->Getbeta() );
435 _set_Gamma_vert_rad( Position->GetGamma() );
436 // set_Gamma_horiz_rad( Gamma_horiz_rad );
438 _set_Earth_position_angle( Auxiliary->GetEarthPositionAngle() );
440 _set_Climb_Rate( Position->Gethdot() );
443 for ( i = 1; i <= 3; i++ ) {
444 for ( j = 1; j <= 3; j++ ) {
445 _set_T_Local_to_Body( i, j, State->GetTl2b(i,j) );
449 // Copy the engine values from JSBSim.
450 for( i=0; i < Propulsion->GetNumEngines(); i++ ) {
451 SGPropertyNode * node = fgGetNode("engines/engine", i, true);
452 FGEngine * eng = Propulsion->GetEngine(i);
453 FGThruster * thrust = Propulsion->GetThruster(i);
455 node->setDoubleValue("mp-osi", eng->getManifoldPressure_inHg());
456 node->setDoubleValue("rpm", thrust->GetRPM());
457 node->setDoubleValue("egt-degf", eng->getExhaustGasTemp_degF());
458 node->setDoubleValue("fuel-flow-gph", eng->getFuelFlow_gph());
459 node->setDoubleValue("cht-degf", eng->getCylinderHeadTemp_degF());
460 node->setDoubleValue("oil-temperature-degf", eng->getOilTemp_degF());
461 node->setDoubleValue("oil-pressure-psi", eng->getOilPressure_psi());
462 node->setBoolValue("running", eng->GetRunning());
463 node->setBoolValue("cranking", eng->GetCranking());
466 static const SGPropertyNode *fuel_freeze
467 = fgGetNode("/sim/freeze/fuel");
469 // Copy the fuel levels from JSBSim if fuel
470 // freeze not enabled.
471 if ( ! fuel_freeze->getBoolValue() ) {
472 for (i = 0; i < Propulsion->GetNumTanks(); i++) {
473 SGPropertyNode * node
474 = fgGetNode("/consumables/fuel/tank", i, true);
475 double contents = Propulsion->GetTank(i)->GetContents();
476 node->setDoubleValue("level-gal_us", contents/6.6);
477 // node->setDoubleValue("level-lb", contents);
483 stall_warning->setDoubleValue( Aircraft->GetStallWarn() );
488 bool FGJSBsim::ToggleDataLogging(void) {
489 return fdmex->GetOutput()->Toggle();
493 bool FGJSBsim::ToggleDataLogging(bool state) {
495 fdmex->GetOutput()->Enable();
498 fdmex->GetOutput()->Disable();
505 void FGJSBsim::set_Latitude(double lat) {
506 static const SGPropertyNode *altitude = fgGetNode("/position/altitude-ft");
508 if ( altitude->getDoubleValue() > -9990 ) {
509 alt = altitude->getDoubleValue();
514 double sea_level_radius_meters, lat_geoc;
516 SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::set_Latitude: " << lat );
517 SG_LOG(SG_FLIGHT,SG_INFO," cur alt (ft) = " << alt );
519 sgGeodToGeoc( lat, alt * SG_FEET_TO_METER, &sea_level_radius_meters, &lat_geoc );
521 _set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET );
522 fgic->SetSeaLevelRadiusFtIC( sea_level_radius_meters * SG_METER_TO_FEET );
523 fgic->SetLatitudeRadIC( lat_geoc );
527 void FGJSBsim::set_Longitude(double lon) {
529 SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::set_Longitude: " << lon );
531 fgic->SetLongitudeRadIC( lon );
535 void FGJSBsim::set_Altitude(double alt) {
536 static const SGPropertyNode *latitude = fgGetNode("/position/latitude-deg");
538 double sea_level_radius_meters,lat_geoc;
540 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Altitude: " << alt );
541 SG_LOG(SG_FLIGHT,SG_INFO, " lat (deg) = " << latitude->getDoubleValue() );
543 sgGeodToGeoc( latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS, alt,
544 &sea_level_radius_meters, &lat_geoc);
545 _set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET );
546 fgic->SetSeaLevelRadiusFtIC( sea_level_radius_meters * SG_METER_TO_FEET );
547 fgic->SetLatitudeRadIC( lat_geoc );
548 fgic->SetAltitudeFtIC(alt);
552 void FGJSBsim::set_V_calibrated_kts(double vc) {
553 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_V_calibrated_kts: " << vc );
555 fgic->SetVcalibratedKtsIC(vc);
559 void FGJSBsim::set_Mach_number(double mach) {
560 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Mach_number: " << mach );
562 fgic->SetMachIC(mach);
566 void FGJSBsim::set_Velocities_Local( double north, double east, double down ){
567 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Local: "
568 << north << ", " << east << ", " << down );
570 fgic->SetVnorthFpsIC(north);
571 fgic->SetVeastFpsIC(east);
572 fgic->SetVdownFpsIC(down);
576 void FGJSBsim::set_Velocities_Wind_Body( double u, double v, double w){
577 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Wind_Body: "
578 << u << ", " << v << ", " << w );
580 fgic->SetUBodyFpsIC(u);
581 fgic->SetVBodyFpsIC(v);
582 fgic->SetWBodyFpsIC(w);
587 void FGJSBsim::set_Euler_Angles( double phi, double theta, double psi ) {
588 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Euler_Angles: "
589 << phi << ", " << theta << ", " << psi );
591 fgic->SetPitchAngleRadIC(theta);
592 fgic->SetRollAngleRadIC(phi);
593 fgic->SetTrueHeadingRadIC(psi);
598 void FGJSBsim::set_Climb_Rate( double roc) {
599 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Climb_Rate: " << roc );
601 fgic->SetClimbRateFpsIC(roc);
605 void FGJSBsim::set_Gamma_vert_rad( double gamma) {
606 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Gamma_vert_rad: " << gamma );
608 fgic->SetFlightPathAngleRadIC(gamma);
613 void FGJSBsim::set_Sea_level_radius(double slr) {
614 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Sea_level_radius: " << slr );
616 fgic->SetSeaLevelRadiusFtIC(slr);
620 void FGJSBsim::set_Runway_altitude(double ralt) {
621 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Runway_altitude: " << ralt );
623 _set_Runway_altitude( ralt );
624 fgic->SetTerrainAltitudeFtIC( ralt );
628 void FGJSBsim::set_Static_pressure(double p) {
629 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Static_pressure: " << p );
631 Atmosphere->SetExPressure(p);
632 if(Atmosphere->External() == true)
636 void FGJSBsim::set_Static_temperature(double T) {
637 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Static_temperature: " << T );
639 Atmosphere->SetExTemperature(T);
640 if(Atmosphere->External() == true)
645 void FGJSBsim::set_Density(double rho) {
646 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Density: " << rho );
648 Atmosphere->SetExDensity(rho);
649 if(Atmosphere->External() == true)
653 void FGJSBsim::set_Velocities_Local_Airmass (double wnorth,
656 SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Local_Airmass: "
657 << wnorth << ", " << weast << ", " << wdown );
659 _set_Velocities_Local_Airmass( wnorth, weast, wdown );
660 Atmosphere->SetWindNED(wnorth, weast, wdown );
661 if(Atmosphere->External() == true)
665 void FGJSBsim::init_gear(void ) {
667 FGGroundReactions* gr=fdmex->GetGroundReactions();
668 int Ngear=GroundReactions->GetNumGearUnits();
669 for (int i=0;i<Ngear;i++) {
670 SGPropertyNode * node = fgGetNode("gear/gear", i, true);
671 node->setDoubleValue("xoffset-in",
672 gr->GetGearUnit(i)->GetBodyLocation()(1));
673 node->setDoubleValue("yoffset-in",
674 gr->GetGearUnit(i)->GetBodyLocation()(2));
675 node->setDoubleValue("zoffset-in",
676 gr->GetGearUnit(i)->GetBodyLocation()(3));
677 node->setBoolValue("wow", gr->GetGearUnit(i)->GetWOW());
678 node->setBoolValue("has-brake", gr->GetGearUnit(i)->GetBrakeGroup() > 0);
679 node->setDoubleValue("position", FCS->GetGearPos());
683 void FGJSBsim::update_gear(void) {
685 FGGroundReactions* gr=fdmex->GetGroundReactions();
686 int Ngear=GroundReactions->GetNumGearUnits();
687 for (int i=0;i<Ngear;i++) {
688 SGPropertyNode * node = fgGetNode("gear/gear", i, true);
689 node->getChild("wow", 0, true)
690 ->setBoolValue(gr->GetGearUnit(i)->GetWOW());
691 node->getChild("position", 0, true)
692 ->setDoubleValue(FCS->GetGearPos());
696 void FGJSBsim::do_trim(void) {
699 if(fgic->GetVcalibratedKtsIC() < 10 ) {
700 fgic->SetVcalibratedKtsIC(0.0);
701 fgtrim=new FGTrim(fdmex,fgic,tGround);
703 fgtrim=new FGTrim(fdmex,fgic,tLongitudinal);
705 if( !fgtrim->DoTrim() ) {
709 trimmed->setBoolValue(true);
711 State->ReportState();
713 pitch_trim->setDoubleValue( FCS->GetPitchTrimCmd() );
714 throttle_trim->setDoubleValue( FCS->GetThrottleCmd(0) );
715 aileron_trim->setDoubleValue( FCS->GetDaCmd() );
716 rudder_trim->setDoubleValue( FCS->GetDrCmd() );
718 globals->get_controls()->set_elevator_trim(FCS->GetPitchTrimCmd());
719 globals->get_controls()->set_elevator(FCS->GetDeCmd());
720 globals->get_controls()->set_throttle(FGControls::ALL_ENGINES,
721 FCS->GetThrottleCmd(0));
723 globals->get_controls()->set_aileron(FCS->GetDaCmd());
724 globals->get_controls()->set_rudder( FCS->GetDrCmd());
726 SG_LOG( SG_FLIGHT, SG_INFO, " Trim complete" );