1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6 Purpose: Models the Martian atmosphere very simply
9 ------------- Copyright (C) 2004 Jon S. Berndt (jon@jsbsim.org) -------------
11 This program is free software; you can redistribute it and/or modify it under
12 the terms of the GNU Lesser General Public License as published by the Free Software
13 Foundation; either version 2 of the License, or (at your option) any later
16 This program is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
18 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
21 You should have received a copy of the GNU Lesser General Public License along with
22 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
23 Place - Suite 330, Boston, MA 02111-1307, USA.
25 Further information about the GNU Lesser General Public License can also be found on
26 the world wide web at http://www.gnu.org.
28 FUNCTIONAL DESCRIPTION
29 --------------------------------------------------------------------------------
30 Models the Martian atmosphere.
33 --------------------------------------------------------------------------------
36 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
37 COMMENTS, REFERENCES, and NOTES
38 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
40 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
42 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
52 static const char *IdSrc = "$Id$";
53 static const char *IdHdr = ID_MARS;
55 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
57 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
60 FGMars::FGMars(FGFDMExec* fdmex) : FGAtmosphere(fdmex)
69 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
71 void FGMars::Calculate(double altitude)
73 //Calculate reftemp, refpress, and density
75 // LIMIT the temperatures so they do not descend below absolute zero.
77 if (altitude < 22960.0) {
78 intTemperature = -25.68 - 0.000548*altitude; // Deg Fahrenheit
80 intTemperature = -10.34 - 0.001217*altitude; // Deg Fahrenheit
82 intPressure = 14.62*exp(-0.00003*altitude); // psf - 14.62 psf =~ 7 millibars
83 intDensity = intPressure/(Reng*intTemperature); // slugs/ft^3 (needs deg R. as input
85 //cout << "Atmosphere: h=" << altitude << " rho= " << intDensity << endl;
88 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
89 // The bitmasked value choices are as follows:
90 // unset: In this case (the default) JSBSim would only print
91 // out the normally expected messages, essentially echoing
92 // the config files as they are read. If the environment
93 // variable is not set, debug_lvl is set to 1 internally
94 // 0: This requests JSBSim not to output any messages
96 // 1: This value explicity requests the normal JSBSim
98 // 2: This value asks for a message to be printed out when
99 // a class is instantiated
100 // 4: When this value is set, a message is displayed when a
101 // FGModel object executes its Run() method
102 // 8: When this value is set, various runtime state variables
103 // are printed out periodically
104 // 16: When set various parameters are sanity checked and
105 // a message is printed out when they go out of bounds
107 void FGMars::Debug(int from)
109 if (debug_lvl <= 0) return;
111 if (debug_lvl & 1) { // Standard console startup message output
112 if (from == 0) { // Constructor
115 if (debug_lvl & 2 ) { // Instantiation/Destruction notification
116 if (from == 0) cout << "Instantiated: FGMars" << endl;
117 if (from == 1) cout << "Destroyed: FGMars" << endl;
119 if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
121 if (debug_lvl & 8 ) { // Runtime state variables
123 if (debug_lvl & 16) { // Sanity checking
125 if (debug_lvl & 32) { // Turbulence
126 if (first_pass && from == 2) {
127 cout << "vTurbulenceNED(X), vTurbulenceNED(Y), vTurbulenceNED(Z), "
128 << "vTurbulenceGrad(X), vTurbulenceGrad(Y), vTurbulenceGrad(Z), "
129 << "vDirection(X), vDirection(Y), vDirection(Z), "
131 << "vTurbPQR(P), vTurbPQR(Q), vTurbPQR(R), " << endl;
132 } else if (from == 2) {
133 cout << vTurbulenceNED << ", " << vTurbulenceGrad << ", " << vDirection << ", " << Magnitude << ", " << vTurbPQR << endl;
136 if (debug_lvl & 64) {
137 if (from == 0) { // Constructor
138 cout << IdSrc << endl;
139 cout << IdHdr << endl;
144 } // namespace JSBSim