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1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2
3  Module:       FGState.cpp
4  Author:       Jon Berndt
5  Date started: 11/17/98
6  Called by:    FGFDMExec and accessed by all models.
7
8  ------------- Copyright (C) 1999  Jon S. Berndt (jsb@hal-pc.org) -------------
9
10  This program is free software; you can redistribute it and/or modify it under
11  the terms of the GNU Lesser General Public License as published by the Free Software
12  Foundation; either version 2 of the License, or (at your option) any later
13  version.
14
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 Lesser General Public License for more
18  details.
19
20  You should have received a copy of the GNU Lesser 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.
23
24  Further information about the GNU Lesser General Public License can also be found on
25  the world wide web at http://www.gnu.org.
26
27 FUNCTIONAL DESCRIPTION
28 --------------------------------------------------------------------------------
29 See header file.
30
31 HISTORY
32 --------------------------------------------------------------------------------
33 11/17/98   JSB   Created
34
35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
36 INCLUDES
37 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
38
39 #include <cmath>
40
41 #include "FGState.h"
42
43 namespace JSBSim {
44
45 static const char *IdSrc = "$Id$";
46 static const char *IdHdr = ID_STATE;
47
48 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
49 MACROS
50 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
51
52 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
53 CLASS IMPLEMENTATION
54 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
55
56 FGState::FGState(FGFDMExec* fdex)
57 {
58   FDMExec = fdex;
59
60   sim_time = 0.0;
61   dt = 1.0/120.0; // a default timestep size. This is needed for when JSBSim is
62                   // run in standalone mode with no initialization file.
63
64   Aircraft     = FDMExec->GetAircraft();
65   Propagate    = FDMExec->GetPropagate();
66   Auxiliary    = FDMExec->GetAuxiliary();
67   FCS          = FDMExec->GetFCS();
68   Atmosphere   = FDMExec->GetAtmosphere();
69   Aerodynamics = FDMExec->GetAerodynamics();
70   GroundReactions = FDMExec->GetGroundReactions();
71   Propulsion      = FDMExec->GetPropulsion();
72   PropertyManager = FDMExec->GetPropertyManager();
73
74   bind();
75
76   Debug(0);
77 }
78
79 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
80
81 FGState::~FGState()
82 {
83   Debug(1);
84 }
85
86 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
87
88 void FGState::Initialize(FGInitialCondition *FGIC)
89 {
90   sim_time = 0.0;
91
92   Propagate->SetInitialState( FGIC );
93
94   Atmosphere->Run();
95   Atmosphere->SetWindNED( FGIC->GetWindNFpsIC(),
96                           FGIC->GetWindEFpsIC(),
97                           FGIC->GetWindDFpsIC() );
98
99   FGColumnVector3 vAeroUVW;
100   vAeroUVW = Propagate->GetUVW() + Propagate->GetTl2b()*Atmosphere->GetTotalWindNED();
101
102   double alpha, beta;
103   if (vAeroUVW(eW) != 0.0)
104     alpha = vAeroUVW(eU)*vAeroUVW(eU) > 0.0 ? atan2(vAeroUVW(eW), vAeroUVW(eU)) : 0.0;
105   else
106     alpha = 0.0;
107   if (vAeroUVW(eV) != 0.0)
108     beta = vAeroUVW(eU)*vAeroUVW(eU)+vAeroUVW(eW)*vAeroUVW(eW) > 0.0 ? atan2(vAeroUVW(eV), (fabs(vAeroUVW(eU))/vAeroUVW(eU))*sqrt(vAeroUVW(eU)*vAeroUVW(eU) + vAeroUVW(eW)*vAeroUVW(eW))) : 0.0;
109   else
110     beta = 0.0;
111
112   Auxiliary->SetAB(alpha, beta);
113
114   double Vt = vAeroUVW.Magnitude();
115   Auxiliary->SetVt(Vt);
116
117   Auxiliary->SetMach(Vt/Atmosphere->GetSoundSpeed());
118
119   double qbar = 0.5*Vt*Vt*Atmosphere->GetDensity();
120   Auxiliary->Setqbar(qbar);
121 }
122
123 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
124
125 void FGState::bind(void)
126 {
127   PropertyManager->Tie("sim-time-sec", this, &FGState::Getsim_time);
128 }
129
130 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
131 //    The bitmasked value choices are as follows:
132 //    unset: In this case (the default) JSBSim would only print
133 //       out the normally expected messages, essentially echoing
134 //       the config files as they are read. If the environment
135 //       variable is not set, debug_lvl is set to 1 internally
136 //    0: This requests JSBSim not to output any messages
137 //       whatsoever.
138 //    1: This value explicity requests the normal JSBSim
139 //       startup messages
140 //    2: This value asks for a message to be printed out when
141 //       a class is instantiated
142 //    4: When this value is set, a message is displayed when a
143 //       FGModel object executes its Run() method
144 //    8: When this value is set, various runtime state variables
145 //       are printed out periodically
146 //    16: When set various parameters are sanity checked and
147 //       a message is printed out when they go out of bounds
148
149 void FGState::Debug(int from)
150 {
151   if (debug_lvl <= 0) return;
152
153   if (debug_lvl & 1) { // Standard console startup message output
154     if (from == 0) { // Constructor
155
156     }
157   }
158   if (debug_lvl & 2 ) { // Instantiation/Destruction notification
159     if (from == 0) cout << "Instantiated: FGState" << endl;
160     if (from == 1) cout << "Destroyed:    FGState" << endl;
161   }
162   if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
163   }
164   if (debug_lvl & 8 ) { // Runtime state variables
165   }
166   if (debug_lvl & 16) { // Sanity checking
167   }
168   if (debug_lvl & 64) {
169     if (from == 0) { // Constructor
170       cout << IdSrc << endl;
171       cout << IdHdr << endl;
172     }
173   }
174 }
175 }