1 /*******************************************************************************
3 Header: FGInitialCondition.cpp
7 ------------- Copyright (C) 1999 Anthony K. Peden (apeden@earthlink.net) -------------
9 This program is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free Software
11 Foundation; either version 2 of the License, or (at your option) any later
14 This program is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
19 You should have received a copy of the GNU General Public License along with
20 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21 Place - Suite 330, Boston, MA 02111-1307, USA.
23 Further information about the GNU General Public License can also be found on
24 the world wide web at http://www.gnu.org.
28 --------------------------------------------------------------------------------
32 FUNCTIONAL DESCRIPTION
33 --------------------------------------------------------------------------------
35 The purpose of this class is to take a set of initial conditions and provide
36 a kinematically consistent set of body axis velocity components, euler
37 angles, and altitude. This class does not attempt to trim the model i.e.
38 the sim will most likely start in a very dynamic state (unless, of course,
39 you have chosen your IC's wisely) even after setting it up with this class.
41 CAVEAT: This class makes use of alpha=theta-gamma. This means that setting
42 any of the three with this class is only valid for steady state
43 (all accels zero) and zero pitch rate. One example where this
44 would produce invalid results is setting up for a trim in a pull-up
45 or pushover (both have nonzero pitch rate). Maybe someday...
47 ********************************************************************************
49 *******************************************************************************/
51 #include "FGInitialCondition.h"
52 #include "FGFDMExec.h"
54 #include "FGAtmosphere.h"
56 #include "FGAircraft.h"
57 #include "FGTranslation.h"
58 #include "FGRotation.h"
59 #include "FGPosition.h"
60 #include "FGAuxiliary.h"
65 FGInitialCondition::FGInitialCondition(FGFDMExec *fdmex)
74 atm=fdmex->GetAtmosphere();
78 FGInitialCondition::~FGInitialCondition(void) {};
81 void FGInitialCondition::SetVcalibratedKtsIC(float tt)
84 cout << "ic.vc: " << vc << endl;
85 cout << "ic.rhosl: " << atm->GetDensity(0) << endl;
86 cout << "ic.rho: " << atm->GetDensity(altitude) << endl;
87 vt=sqrt(atm->GetDensity(0)/atm->GetDensity(altitude)*vc*vc);
88 cout << "ic.vt: " << vt << endl;
89 //mach=vt*sqrt(SHRATIO*Reng*atm->GetTemperature(altitude));
93 void FGInitialCondition::SetVtrueKtsIC(float tt)
96 //vc=sqrt(atm->GetDensity(altitude)/atm->GetDensity(0)*vt*vt);
97 //mach=vt*sqrt(SHRATIO*Reng*atm->GetTemperature(altitude));
101 void FGInitialCondition::SetMachIC(float tt)
104 vt=mach*sqrt(SHRATIO*Reng*atm->GetTemperature(altitude));
105 //vc=sqrt(atm->GetDensity(altitude)/atm->GetDensity(0)*vt*vt);
109 void FGInitialCondition::SetAltitudeFtIC(float tt)
112 //mach=vt/sqrt(SHRATIO*Reng*atm->GetTemperature(altitude));
113 //vc=sqrt(atm->GetDensity(altitude)/atm->GetDensity(0)*vt*vt);
117 void FGInitialCondition::SetFlightPathAngleDegIC(float tt)
124 void FGInitialCondition::SetAlphaDegIC(float tt)
131 void FGInitialCondition::SetBetaDegIC(float tt)
137 void FGInitialCondition::SetRollAngleDegIC(float tt)
143 void FGInitialCondition::SetPitchAngleDegIC(float tt)
150 void FGInitialCondition::SetHeadingDegIC(float tt)
156 void FGInitialCondition::SetLatitudeDegIC(float tt)
158 latitude=tt*DEGTORAD;
162 void FGInitialCondition::SetLongitudeDegIC(float tt)
164 longitude=tt*DEGTORAD;
168 float FGInitialCondition::GetUBodyFpsIC(void)
170 return vt*cos(alpha)*cos(beta);
174 float FGInitialCondition::GetVBodyFpsIC(void)
180 float FGInitialCondition::GetWBodyFpsIC(void)
182 return vt*sin(alpha)*cos(beta);
186 float FGInitialCondition::GetThetaRadIC(void)
192 float FGInitialCondition::GetPhiRadIC(void)
198 float FGInitialCondition::GetPsiRadIC(void)
204 float FGInitialCondition::GetLatitudeRadIC(void)
210 float FGInitialCondition::GetLongitudeRadIC(void)
216 float FGInitialCondition::GetAltitudeFtIC(void)