1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6 Purpose: Encapsulates the nozzle object
8 ------------- Copyright (C) 2000 Jon S. Berndt (jsb@hal-pc.org) -------------
10 This program is free software; you can redistribute it and/or modify it under
11 the terms of the GNU 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 General Public License for more
20 You should have received a copy of the GNU 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 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
41 #include "FGAtmosphere.h"
45 static const char *IdSrc = "$Id$";
46 static const char *IdHdr = ID_NOZZLE;
48 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
50 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
53 FGNozzle::FGNozzle(FGFDMExec* FDMExec, FGConfigFile* Nzl_cfg) : FGThruster(FDMExec)
57 Name = Nzl_cfg->GetValue("NAME");
58 Nzl_cfg->GetNextConfigLine();
59 while (Nzl_cfg->GetValue() != string("/FG_NOZZLE")) {
61 if (token == "PE") *Nzl_cfg >> PE;
62 else if (token == "EXPR") *Nzl_cfg >> ExpR;
63 else if (token == "NZL_EFF") *Nzl_cfg >> nzlEff;
64 else if (token == "DIAM") *Nzl_cfg >> Diameter;
65 else cerr << "Unhandled token in Nozzle config file: " << token << endl;
71 Area2 = (Diameter*Diameter/4.0)*M_PI;
77 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
84 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
86 double FGNozzle::Calculate(double CfPc)
88 double pAtm = fdmex->GetAtmosphere()->GetPressure();
89 Thrust = max((double)0.0, (CfPc * AreaT + (PE - pAtm)*Area2) * nzlEff);
90 vFn(1) = Thrust * cos(ReverserAngle);
95 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
97 double FGNozzle::GetPowerRequired(void)
102 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
104 string FGNozzle::GetThrusterLabels(int id)
106 std::ostringstream buf;
108 buf << Name << "_Thrust[" << id << ']';
113 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
115 string FGNozzle::GetThrusterValues(int id)
117 std::ostringstream buf;
124 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
125 // The bitmasked value choices are as follows:
126 // unset: In this case (the default) JSBSim would only print
127 // out the normally expected messages, essentially echoing
128 // the config files as they are read. If the environment
129 // variable is not set, debug_lvl is set to 1 internally
130 // 0: This requests JSBSim not to output any messages
132 // 1: This value explicity requests the normal JSBSim
134 // 2: This value asks for a message to be printed out when
135 // a class is instantiated
136 // 4: When this value is set, a message is displayed when a
137 // FGModel object executes its Run() method
138 // 8: When this value is set, various runtime state variables
139 // are printed out periodically
140 // 16: When set various parameters are sanity checked and
141 // a message is printed out when they go out of bounds
143 void FGNozzle::Debug(int from)
145 if (debug_lvl <= 0) return;
147 if (debug_lvl & 1) { // Standard console startup message output
148 if (from == 0) { // Constructor
149 cout << " Nozzle Name: " << Name << endl;
150 cout << " Nozzle Exit Pressure = " << PE << endl;
151 cout << " Nozzle Expansion Ratio = " << ExpR << endl;
152 cout << " Nozzle Efficiency = " << nzlEff << endl;
153 cout << " Nozzle Diameter = " << Diameter << endl;
156 if (debug_lvl & 2 ) { // Instantiation/Destruction notification
157 if (from == 0) cout << "Instantiated: FGNozzle" << endl;
158 if (from == 1) cout << "Destroyed: FGNozzle" << endl;
160 if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
162 if (debug_lvl & 8 ) { // Runtime state variables
164 if (debug_lvl & 16) { // Sanity checking
166 if (debug_lvl & 64) {
167 if (from == 0) { // Constructor
168 cout << IdSrc << endl;
169 cout << IdHdr << endl;