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 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
41 #include <models/FGAtmosphere.h>
45 static const char *IdSrc = "$Id$";
46 static const char *IdHdr = ID_NOZZLE;
48 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
50 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
53 FGNozzle::FGNozzle(FGFDMExec* FDMExec, Element* nozzle_element, int num)
54 : FGThruster(FDMExec, nozzle_element, num)
56 if (nozzle_element->FindElement("area"))
57 Area = nozzle_element->FindElementValueAsNumberConvertTo("area", "FT2");
59 cerr << "Fatal Error: Nozzle exit area must be given in nozzle config file." << endl;
63 if (nozzle_element->FindElement("pe"))
64 PE = nozzle_element->FindElementValueAsNumberConvertTo("pe", "PSF");
66 cerr << "Fatal Error: Nozzle exit pressure must be given in nozzle config file." << endl;
76 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
83 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
85 double FGNozzle::Calculate(double vacThrust)
87 double pAtm = fdmex->GetAtmosphere()->GetPressure();
88 Thrust = max((double)0.0, vacThrust - pAtm*Area);
90 vFn(1) = Thrust * cos(ReverserAngle);
95 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
97 string FGNozzle::GetThrusterLabels(int id, string delimeter)
99 std::ostringstream buf;
101 buf << Name << " Thrust (engine " << id << " in lbs)";
106 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
108 string FGNozzle::GetThrusterValues(int id, string delimeter)
110 std::ostringstream buf;
117 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
118 // The bitmasked value choices are as follows:
119 // unset: In this case (the default) JSBSim would only print
120 // out the normally expected messages, essentially echoing
121 // the config files as they are read. If the environment
122 // variable is not set, debug_lvl is set to 1 internally
123 // 0: This requests JSBSim not to output any messages
125 // 1: This value explicity requests the normal JSBSim
127 // 2: This value asks for a message to be printed out when
128 // a class is instantiated
129 // 4: When this value is set, a message is displayed when a
130 // FGModel object executes its Run() method
131 // 8: When this value is set, various runtime state variables
132 // are printed out periodically
133 // 16: When set various parameters are sanity checked and
134 // a message is printed out when they go out of bounds
136 void FGNozzle::Debug(int from)
138 if (debug_lvl <= 0) return;
140 if (debug_lvl & 1) { // Standard console startup message output
141 if (from == 0) { // Constructor
142 cout << " Nozzle Name: " << Name << endl;
143 cout << " Nozzle Exit Area = " << Area << endl;
146 if (debug_lvl & 2 ) { // Instantiation/Destruction notification
147 if (from == 0) cout << "Instantiated: FGNozzle" << endl;
148 if (from == 1) cout << "Destroyed: FGNozzle" << endl;
150 if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
152 if (debug_lvl & 8 ) { // Runtime state variables
154 if (debug_lvl & 16) { // Sanity checking
156 if (debug_lvl & 64) {
157 if (from == 0) { // Constructor
158 cout << IdSrc << endl;
159 cout << IdHdr << endl;