1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6 Purpose: Encapsulates the JSBBase object
8 ------------- Copyright (C) 2001 Jon S. Berndt (jon@jsbsim.org) -------------
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
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
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.
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.
27 FUNCTIONAL DESCRIPTION
28 --------------------------------------------------------------------------------
31 --------------------------------------------------------------------------------
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
36 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
40 #include "FGJSBBase.h"
49 IDENT(IdSrc,"$Id: FGJSBBase.cpp,v 1.40 2015/07/12 19:34:08 bcoconni Exp $");
50 IDENT(IdHdr,ID_JSBBASE);
52 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
54 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
57 char FGJSBBase::highint[5] = {27, '[', '1', 'm', '\0' };
58 char FGJSBBase::halfint[5] = {27, '[', '2', 'm', '\0' };
59 char FGJSBBase::normint[6] = {27, '[', '2', '2', 'm', '\0' };
60 char FGJSBBase::reset[5] = {27, '[', '0', 'm', '\0' };
61 char FGJSBBase::underon[5] = {27, '[', '4', 'm', '\0' };
62 char FGJSBBase::underoff[6] = {27, '[', '2', '4', 'm', '\0' };
63 char FGJSBBase::fgblue[6] = {27, '[', '3', '4', 'm', '\0' };
64 char FGJSBBase::fgcyan[6] = {27, '[', '3', '6', 'm', '\0' };
65 char FGJSBBase::fgred[6] = {27, '[', '3', '1', 'm', '\0' };
66 char FGJSBBase::fggreen[6] = {27, '[', '3', '2', 'm', '\0' };
67 char FGJSBBase::fgdef[6] = {27, '[', '3', '9', 'm', '\0' };
69 char FGJSBBase::highint[5] = {'\0' };
70 char FGJSBBase::halfint[5] = {'\0' };
71 char FGJSBBase::normint[6] = {'\0' };
72 char FGJSBBase::reset[5] = {'\0' };
73 char FGJSBBase::underon[5] = {'\0' };
74 char FGJSBBase::underoff[6] = {'\0' };
75 char FGJSBBase::fgblue[6] = {'\0' };
76 char FGJSBBase::fgcyan[6] = {'\0' };
77 char FGJSBBase::fgred[6] = {'\0' };
78 char FGJSBBase::fggreen[6] = {'\0' };
79 char FGJSBBase::fgdef[6] = {'\0' };
82 const double FGJSBBase::radtodeg = 57.295779513082320876798154814105;
83 const double FGJSBBase::degtorad = 0.017453292519943295769236907684886;
84 const double FGJSBBase::hptoftlbssec = 550.0;
85 const double FGJSBBase::psftoinhg = 0.014138;
86 const double FGJSBBase::psftopa = 47.88;
87 const double FGJSBBase::fpstokts = 0.592484;
88 const double FGJSBBase::ktstofps = 1.68781;
89 const double FGJSBBase::inchtoft = 0.08333333;
90 const double FGJSBBase::in3tom3 = 1.638706E-5;
91 const double FGJSBBase::m3toft3 = 1.0/(fttom*fttom*fttom);
92 const double FGJSBBase::inhgtopa = 3386.38;
93 const double FGJSBBase::fttom = 0.3048;
94 double FGJSBBase::Reng = 1716.56; // Gas constant for Air (ft-lb/slug-R)
95 double FGJSBBase::Rstar = 1545.348; // Universal gas constant
96 double FGJSBBase::Mair = 28.9645; //
97 const double FGJSBBase::SHRatio = 1.40;
99 // Note that definition of lbtoslug by the inverse of slugtolb and not
100 // to a different constant you can also get from some tables will make
101 // lbtoslug*slugtolb == 1 up to the magnitude of roundoff. So converting from
102 // slug to lb and back will yield to the original value you started with up
103 // to the magnitude of roundoff.
104 // Taken from units gnu commandline tool
105 const double FGJSBBase::slugtolb = 32.174049;
106 const double FGJSBBase::lbtoslug = 1.0/slugtolb;
107 const double FGJSBBase::kgtolb = 2.20462;
108 const double FGJSBBase::kgtoslug = 0.06852168;
110 const string FGJSBBase::needed_cfg_version = "2.0";
111 const string FGJSBBase::JSBSim_version = "1.0 " __DATE__ " " __TIME__ ;
113 queue <FGJSBBase::Message> FGJSBBase::Messages;
114 FGJSBBase::Message FGJSBBase::localMsg;
115 unsigned int FGJSBBase::messageId = 0;
117 int FGJSBBase::gaussian_random_number_phase = 0;
119 short FGJSBBase::debug_lvl = 1;
121 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
123 void FGJSBBase::PutMessage(const Message& msg)
128 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
130 void FGJSBBase::PutMessage(const string& text)
134 msg.messageId = messageId++;
135 msg.subsystem = "FDM";
136 msg.type = Message::eText;
140 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
142 void FGJSBBase::PutMessage(const string& text, bool bVal)
146 msg.messageId = messageId++;
147 msg.subsystem = "FDM";
148 msg.type = Message::eBool;
153 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
155 void FGJSBBase::PutMessage(const string& text, int iVal)
159 msg.messageId = messageId++;
160 msg.subsystem = "FDM";
161 msg.type = Message::eInteger;
166 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
168 void FGJSBBase::PutMessage(const string& text, double dVal)
172 msg.messageId = messageId++;
173 msg.subsystem = "FDM";
174 msg.type = Message::eDouble;
179 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
181 void FGJSBBase::ProcessMessage(void)
183 if (Messages.empty()) return;
184 localMsg = Messages.front();
186 while (SomeMessages()) {
187 switch (localMsg.type) {
188 case JSBSim::FGJSBBase::Message::eText:
189 cout << localMsg.messageId << ": " << localMsg.text << endl;
191 case JSBSim::FGJSBBase::Message::eBool:
192 cout << localMsg.messageId << ": " << localMsg.text << " " << localMsg.bVal << endl;
194 case JSBSim::FGJSBBase::Message::eInteger:
195 cout << localMsg.messageId << ": " << localMsg.text << " " << localMsg.iVal << endl;
197 case JSBSim::FGJSBBase::Message::eDouble:
198 cout << localMsg.messageId << ": " << localMsg.text << " " << localMsg.dVal << endl;
201 cerr << "Unrecognized message type." << endl;
205 if (SomeMessages()) localMsg = Messages.front();
211 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
213 FGJSBBase::Message* FGJSBBase::ProcessNextMessage(void)
215 if (Messages.empty()) return NULL;
216 localMsg = Messages.front();
222 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
224 void FGJSBBase::disableHighLighting(void)
239 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
241 string FGJSBBase::CreateIndexedPropertyName(const string& Property, int index)
244 buf << Property << '[' << index << ']';
248 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
250 double FGJSBBase::GaussianRandomNumber(void)
252 static double V1, V2, S;
255 if (gaussian_random_number_phase == 0) {
256 V1 = V2 = S = X = 0.0;
259 double U1 = (double)rand() / RAND_MAX;
260 double U2 = (double)rand() / RAND_MAX;
264 S = V1 * V1 + V2 * V2;
265 } while(S >= 1 || S == 0);
267 X = V1 * sqrt(-2 * log(S) / S);
269 X = V2 * sqrt(-2 * log(S) / S);
271 gaussian_random_number_phase = 1 - gaussian_random_number_phase;
276 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
278 double FGJSBBase::VcalibratedFromMach(double mach, double p, double psl, double rhosl)
282 if (mach < 0) mach=0;
283 if (mach < 1) //calculate total pressure assuming isentropic flow
284 pt=p*pow((1 + 0.2*mach*mach),3.5);
286 // shock in front of pitot tube, we'll assume its normal and use
287 // the Rayleigh Pitot Tube Formula, i.e. the ratio of total
288 // pressure behind the shock to the static pressure in front of
289 // the normal shock assumption should not be a bad one -- most supersonic
290 // aircraft place the pitot probe out front so that it is the forward
291 // most point on the aircraft. The real shock would, of course, take
292 // on something like the shape of a rounded-off cone but, here again,
293 // the assumption should be good since the opening of the pitot probe
294 // is very small and, therefore, the effects of the shock curvature
295 // should be small as well. AFAIK, this approach is fairly well accepted
296 // within the aerospace community
298 // The denominator below is zero for Mach ~ 0.38, for which
299 // we'll never be here, so we're safe
301 pt = p*166.92158*pow(mach,7.0)/pow(7*mach*mach-1,2.5);
304 A = pow(((pt-p)/psl+1),0.28571);
305 return sqrt(7*psl/rhosl*(A-1));
308 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
310 double FGJSBBase::MachFromVcalibrated(double vcas, double p, double psl, double rhosl)
312 double pt = p + psl*(pow(1+vcas*vcas*rhosl/(7.0*psl),3.5)-1);
315 return sqrt(5.0*(pow(pt/p, 0.2857143) -1)); // Mach < 1
318 double mach = sqrt(0.77666*pt/p); // Initial guess is based on a quadratic approximation of the Rayleigh formula
320 double target = pt/(166.92158*p);
323 // Find the root with Newton-Raphson. Since the differential is never zero,
324 // the function is monotonic and has only one root with a multiplicity of one.
325 // Convergence is certain.
326 while (delta > 1E-5 && iter < 10) {
327 double m2 = mach*mach; // Mach^2
328 double m6 = m2*m2*m2; // Mach^6
329 delta = mach*m6/pow(7.0*m2-1.0,2.5) - target;
330 double diff = 7.0*m6*(2.0*m2-1)/pow(7.0*m2-1.0,3.5); // Never zero when Mach >= 1
338 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
340 } // namespace JSBSim