1 #include <simgear/misc/sg_path.hxx>
2 #include <simgear/debug/logstream.hxx>
3 #include <simgear/xml/easyxml.hxx>
4 #include <Main/globals.hxx>
5 #include <Main/fg_props.hxx>
6 #include <Scenery/scenery.hxx>
9 #include "Atmosphere.hpp"
11 #include "Airplane.hpp"
13 #include "Integrator.hpp"
16 #include "PropEngine.hpp"
17 #include "PistonEngine.hpp"
21 using namespace yasim;
23 static const float RAD2DEG = 180/3.14159265358979323846;
24 static const float RAD2RPM = 9.54929658551;
25 static const float M2FT = 3.2808399;
26 static const float FT2M = 0.3048;
27 static const float MPS2KTS = 3600.0/1852.0;
28 static const float CM2GALS = 264.172037284; // gallons/cubic meter
29 static const float KG2LBS = 2.20462262185;
30 static const float W2HP = 1.3416e-3;
32 void YASim::printDEBUG()
34 static int debugCount = 0;
40 // printf("N1 %5.1f N2 %5.1f FF %7.1f EPR %4.2f EGT %6.1f\n",
41 // fgGetFloat("/engines/engine[0]/n1"),
42 // fgGetFloat("/engines/engine[0]/n2"),
43 // fgGetFloat("/engines/engine[0]/fuel-flow-gph"),
44 // fgGetFloat("/engines/engine[0]/epr"),
45 // fgGetFloat("/engines/engine[0]/egt"));
47 // printf("gear: %f\n", fgGetFloat("/controls/gear-down"));
49 // printf("alpha %5.1f beta %5.1f\n", get_Alpha()*57.3, get_Beta()*57.3);
51 // printf("pilot: %f %f %f\n",
52 // fgGetDouble("/sim/view/pilot/x-offset-m"),
53 // fgGetDouble("/sim/view/pilot/y-offset-m"),
54 // fgGetDouble("/sim/view/pilot/z-offset-m"));
58 YASim::YASim(double dt)
65 _fdm->getAirplane()->getModel()->getIntegrator()->setInterval(_dt);
70 Airplane* a = _fdm->getAirplane();
72 float aoa = a->getCruiseAoA() * RAD2DEG;
73 float tail = -1 * a->getTailIncidence() * RAD2DEG;
74 float drag = 1000 * a->getDragCoefficient();
76 SG_LOG(SG_FLIGHT,SG_INFO,"YASim solution results:");
77 SG_LOG(SG_FLIGHT,SG_INFO," Iterations: "<<a->getSolutionIterations());
78 SG_LOG(SG_FLIGHT,SG_INFO,"Drag Coefficient: "<< drag);
79 SG_LOG(SG_FLIGHT,SG_INFO," Lift Ratio: "<<a->getLiftRatio());
80 SG_LOG(SG_FLIGHT,SG_INFO," Cruise AoA: "<< aoa);
81 SG_LOG(SG_FLIGHT,SG_INFO," Tail Incidence: "<< tail);
85 a->getModel()->getBody()->getCG(cg);
86 sprintf(buf, " CG: %.1f, %.1f, %.1f", cg[0], cg[1], cg[2]);
87 SG_LOG(SG_FLIGHT, SG_INFO, buf);
89 if(a->getFailureMsg()) {
90 SG_LOG(SG_FLIGHT, SG_ALERT, "YASim SOLUTION FAILURE:");
91 SG_LOG(SG_FLIGHT, SG_ALERT, a->getFailureMsg());
98 // Run the superclass bind to set up a bunch of property ties
101 // Now UNtie the ones that we are going to set ourselves.
102 fgUntie("/consumables/fuel/tank[0]/level-gal_us");
103 fgUntie("/consumables/fuel/tank[1]/level-gal_us");
106 for(int i=0; i<_fdm->getAirplane()->getModel()->numThrusters(); i++) {
107 sprintf(buf, "/engines/engine[%d]/fuel-flow-gph", i); fgUntie(buf);
108 sprintf(buf, "/engines/engine[%d]/rpm", i); fgUntie(buf);
109 sprintf(buf, "/engines/engine[%d]/mp-osi", i); fgUntie(buf);
110 sprintf(buf, "/engines/engine[%d]/egt-degf", i); fgUntie(buf);
117 Airplane* a = _fdm->getAirplane();
118 Model* m = a->getModel();
123 m->setCrashed(false);
125 // Build a filename and parse it
126 SGPath f(globals->get_fg_root());
127 f.append("Aircraft-yasim");
128 f.append(fgGetString("/sim/aero"));
130 readXML(f.str(), *_fdm);
132 // Compile it into a real airplane, and tell the user what they got
138 // Create some FG{Eng|Gear}Interface objects
140 for(i=0; i<a->numGear(); i++) {
141 Gear* g = a->getGear(i);
142 SGPropertyNode * node = fgGetNode("gear/gear", i, true);
145 node->setDoubleValue("xoffset-in", pos[0]);
146 node->setDoubleValue("yoffset-in", pos[1]);
147 node->setDoubleValue("zoffset-in", pos[2]);
149 for(i=0; i<m->numThrusters(); i++) {
150 // Sanify the initial input conditions
152 sprintf(buf, "/controls/throttle[%d]", i); fgSetFloat(buf, 0);
153 sprintf(buf, "/controls/mixture[%d]", i); fgSetFloat(buf, 1);
154 sprintf(buf, "/controls/propeller-pitch[%d]", i); fgSetFloat(buf, 1);
155 sprintf(buf, "/controls/afterburner[%d]", i); fgSetFloat(buf, 0);
158 fgSetFloat("/controls/slats", 0);
159 fgSetFloat("/controls/spoilers", 0);
161 // Are we at ground level? If so, lift the plane up so the gear
163 double runway_altitude =
164 fgGetDouble("/environment/ground-elevation-m") * SG_METER_TO_FEET;
165 fgSetBool("/controls/gear-down", false);
166 if(get_Altitude() - runway_altitude < 50) {
167 float minGearZ = 1e18;
168 for(i=0; i<a->numGear(); i++) {
169 Gear* g = a->getGear(i);
172 if(pos[2] < minGearZ)
175 _set_Altitude(runway_altitude - minGearZ*M2FT);
176 fgSetBool("/controls/gear-down", true);
179 // The pilot's eyepoint
181 a->getPilotPos(pilot);
182 // fgSetFloat("/sim/view/pilot/x-offset-m", -pilot[0]);
183 // fgSetFloat("/sim/view/pilot/y-offset-m", -pilot[1]);
184 // fgSetFloat("/sim/view/pilot/z-offset-m", pilot[2]);
186 // Blank the state, and copy in ours
191 _fdm->getExternalInput();
192 _fdm->getAirplane()->initEngines();
197 void YASim::update(double dt)
202 int iterations = _calc_multiloop(dt);
204 // If we're crashed, then we don't care
205 if(_fdm->getAirplane()->getModel()->isCrashed())
209 for(i=0; i<iterations; i++) {
218 void YASim::copyToYASim(bool copyState)
221 float lat = get_Latitude();
222 float lon = get_Longitude();
223 float alt = get_Altitude() * FT2M;
224 float roll = get_Phi();
225 float pitch = get_Theta();
226 float hdg = get_Psi();
230 wind[0] = get_V_north_airmass() * FT2M * -1.0;
231 wind[1] = get_V_east_airmass() * FT2M * -1.0;
232 wind[2] = get_V_down_airmass() * FT2M * -1.0;
234 // The ground elevation doesn't come from FGInterface; query it
235 // from the scenery and set it for others to find.
236 double ground = scenery.get_cur_elev();
237 _set_Runway_altitude(ground * FT2M);
238 // cout << "YASIM: ground = " << ground << endl;
240 // You'd this this would work, but it doesn't. These values are
241 // always zero. Use a "standard" pressure intstead.
243 // float pressure = get_Static_pressure();
244 // float temp = get_Static_temperature();
245 float pressure = Atmosphere::getStdPressure(alt);
246 float temp = Atmosphere::getStdTemperature(alt);
249 Model* model = _fdm->getAirplane()->getModel();
252 Glue::xyz2nedMat(lat, lon, xyz2ned);
255 Glue::geod2xyz(lat, lon, alt, s.pos);
258 Glue::euler2orient(roll, pitch, hdg, s.orient);
259 Math::mmul33(s.orient, xyz2ned, s.orient);
261 // Copy in the existing velocity for now...
262 Math::set3(model->getState()->v, s.v);
268 Math::tmul33(xyz2ned, wind, wind);
269 model->setWind(wind);
271 // ground. Calculate a cartesian coordinate for the ground under
272 // us, find the (geodetic) up vector normal to the ground, then
273 // use that to find the final (radius) term of the plane equation.
274 double xyz[3], gplane[3]; float up[3];
275 Glue::geod2xyz(lat, lon, ground, xyz);
276 Glue::geodUp(xyz, up); // FIXME, needless reverse computation...
278 for(i=0; i<3; i++) gplane[i] = up[i];
279 double rad = gplane[0]*xyz[0] + gplane[1]*xyz[1] + gplane[2]*xyz[2];
280 model->setGroundPlane(gplane, rad);
283 model->setAir(pressure, temp);
286 // All the settables:
288 // These are set below:
291 // _set_Accels_CG_Body
292 // _set_Accels_Pilot_Body
293 // _set_Accels_CG_Body_N
294 // _set_Velocities_Local
295 // _set_Velocities_Ground
296 // _set_Velocities_Wind_Body
301 // _set_V_ground_speed
303 // _set_V_calibrated_kts
311 // _set_Geodetic_Position
312 // _set_Runway_altitude
314 // Ignoring these, because they're unused:
315 // _set_Geocentric_Position
316 // _set_Geocentric_Rates
319 // _set_Earth_position_angle (WTF?)
320 // _set_Gamma_vert_rad
322 // _set_T_Local_to_Body
324 // _set_Sea_Level_Radius
326 // Externally set via the weather code:
327 // _set_Velocities_Local_Airmass
329 // _set_Static_pressure
330 // _set_Static_temperature
331 void YASim::copyFromYASim()
333 Airplane* airplane = _fdm->getAirplane();
334 Model* model = airplane->getModel();
335 State* s = model->getState();
338 double lat, lon, alt;
339 Glue::xyz2geod(s->pos, &lat, &lon, &alt);
340 _set_Geodetic_Position(lat, lon, alt*M2FT);
343 //_set_Geocentric_Position(Glue::geod2geocLat(lat), lon, alt*M2FT);
345 _set_Altitude_AGL(model->getAGL() * M2FT);
347 // useful conversion matrix
349 Glue::xyz2nedMat(lat, lon, xyz2ned);
353 Math::vmul33(xyz2ned, s->v, v);
354 _set_Velocities_Local(M2FT*v[0], M2FT*v[1], M2FT*v[2]);
355 _set_V_ground_speed(Math::sqrt(M2FT*v[0]*M2FT*v[0] +
356 M2FT*v[1]*M2FT*v[1]));
357 _set_Climb_Rate(-M2FT*v[2]);
359 // The HUD uses this, but inverts down (?!)
360 _set_Velocities_Ground(M2FT*v[0], M2FT*v[1], -M2FT*v[2]);
362 // _set_Geocentric_Rates(M2FT*v[0], M2FT*v[1], M2FT*v[2]); // UNUSED
366 wind[0] = get_V_north_airmass() * FT2M * -1.0; // Wind in NED
367 wind[1] = get_V_east_airmass() * FT2M * -1.0;
368 wind[2] = get_V_down_airmass() * FT2M * -1.0;
369 Math::tmul33(xyz2ned, wind, wind); // Wind in global
370 Math::sub3(s->v, wind, v); // V - wind in global
371 Math::vmul33(s->orient, s->v, v); // to body coordinates
372 _set_Velocities_Wind_Body(v[0]*M2FT, -v[1]*M2FT, -v[2]*M2FT);
373 _set_V_rel_wind(Math::mag3(v)*M2FT); // units?
376 // These don't work, use a dummy based on altitude
377 // float P = get_Static_pressure();
378 // float T = get_Static_temperature();
379 float P = Atmosphere::getStdPressure(alt);
380 float T = Atmosphere::getStdTemperature(alt);
381 _set_V_equiv_kts(Atmosphere::calcVEAS(v[0], P, T)*MPS2KTS);
382 _set_V_calibrated_kts(Atmosphere::calcVCAS(v[0], P, T)*MPS2KTS);
383 _set_Mach_number(Atmosphere::calcMach(v[0], T));
386 Math::vmul33(xyz2ned, s->acc, v);
387 _set_Accels_Local(M2FT*v[0], M2FT*v[1], M2FT*v[2]);
389 Math::vmul33(s->orient, s->acc, v);
390 _set_Accels_Body(M2FT*v[0], -M2FT*v[1], -M2FT*v[2]);
391 _set_Accels_CG_Body(M2FT*v[0], -M2FT*v[1], -M2FT*v[2]);
393 _fdm->getAirplane()->getPilotAccel(v);
394 _set_Accels_Pilot_Body(M2FT*v[0], M2FT*v[1], -M2FT*v[2]);
396 // The one appears (!) to want inverted pilot acceleration
397 // numbers, in G's...
398 Math::mul3(1.0/9.8, v, v);
399 _set_Accels_CG_Body_N(v[0], -v[1], -v[2]);
403 Glue::calcAlphaBeta(s, &alpha, &beta);
408 Math::trans33(xyz2ned, tmp);
409 Math::mmul33(s->orient, tmp, tmp);
410 float roll, pitch, hdg;
411 Glue::orient2euler(tmp, &roll, &pitch, &hdg);
412 _set_Euler_Angles(roll, pitch, hdg);
415 Math::vmul33(s->orient, s->rot, v);
416 _set_Omega_Body(v[0], -v[1], -v[2]);
418 Glue::calcEulerRates(s, &roll, &pitch, &hdg);
419 _set_Euler_Rates(roll, pitch, hdg);
421 // Fill out our engine and gear objects
423 for(i=0; i<airplane->numGear(); i++) {
424 Gear* g = airplane->getGear(i);
425 SGPropertyNode * node = fgGetNode("gear/gear", i, true);
426 node->setBoolValue("has-brake", g->getBrake() != 0);
427 node->setBoolValue("wow", g->getCompressFraction() != 0);
428 node->setFloatValue("compression-norm", g->getCompressFraction());
431 for(i=0; i<model->numThrusters(); i++) {
432 SGPropertyNode * node = fgGetNode("engines/engine", i, true);
433 Thruster* t = model->getThruster(i);
435 node->setBoolValue("running", t->isRunning());
436 node->setBoolValue("cranking", t->isCranking());
438 // Note: assumes all tanks have the same fuel density!
439 node->setDoubleValue("fuel-flow-gph", CM2GALS * t->getFuelFlow()
440 / airplane->getFuelDensity(0));
444 node->setDoubleValue("prop-thrust", Math::mag3(tmp) * KG2LBS / 9.8);
446 PropEngine* pe = t->getPropEngine();
448 node->setDoubleValue("rpm", pe->getOmega() * RAD2RPM);
451 float power = Math::mag3(tmp) * pe->getOmega();
452 float maxPower = pe->getPistonEngine()->getMaxPower();
454 node->setDoubleValue("max-hp", maxPower * W2HP);
455 node->setDoubleValue("power-pct", 100 * power/maxPower);