src/FDM/UIUCModel/uiuc_engine.cpp

   1 /**********************************************************************
   2
   3  FILENAME:     uiuc_engine.cpp
   4
   5 ----------------------------------------------------------------------
   6
   7  DESCRIPTION:  determine the engine forces and moments
   8
   9 ----------------------------------------------------------------------
  10
  11  STATUS:       alpha version
  12
  13 ----------------------------------------------------------------------
  14
  15  REFERENCES:   based on portions of c172_engine.c, called from ls_model
  16
  17 ----------------------------------------------------------------------
  18
  19  HISTORY:      01/30/2000   initial release
  20
  21 ----------------------------------------------------------------------
  22
  23  AUTHOR(S):    Bipin Sehgal       <bsehgal@uiuc.edu>
  24                Jeff Scott         <jscott@mail.com>
  25                Michael Selig      <m-selig@uiuc.edu>
  26
  27 ----------------------------------------------------------------------
  28
  29  VARIABLES:
  30
  31 ----------------------------------------------------------------------
  32
  33  INPUTS:       -engine model
  34
  35 ----------------------------------------------------------------------
  36
  37  OUTPUTS:      -F_X_engine
  38                -F_Z_engine
  39                -M_m_engine
  40
  41 ----------------------------------------------------------------------
  42
  43  CALLED BY:   uiuc_wrapper.cpp
  44
  45 ----------------------------------------------------------------------
  46
  47  CALLS TO:     none
  48
  49 ----------------------------------------------------------------------
  50
  51  COPYRIGHT:    (C) 2000 by Michael Selig
  52
  53  This program is free software; you can redistribute it and/or
  54  modify it under the terms of the GNU General Public License
  55  as published by the Free Software Foundation.
  56
  57  This program is distributed in the hope that it will be useful,
  58  but WITHOUT ANY WARRANTY; without even the implied warranty of
  59  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  60  GNU General Public License for more details.
  61
  62  You should have received a copy of the GNU General Public License
  63  along with this program; if not, write to the Free Software
  64  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  65  USA or view http://www.gnu.org/copyleft/gpl.html.
  66
  67 **********************************************************************/
  68 #include <simgear/compiler.h>
  69
  70 #include "uiuc_engine.h"
  71
  72 FG_USING_STD(cerr);
  73
  74 void uiuc_engine()
  75 {
  76   stack command_list;
  77   string linetoken1;
  78   string linetoken2;
  79
  80   /* [] mss questions: why do this here ... and then undo it later?
  81      ... does Throttle[3] get modified? */
  82   Throttle[3] = Throttle_pct;
  83
  84   command_list = engineParts -> getCommands();
  85
  86   if (command_list.begin() == command_list.end())
  87   {
  88         cerr << "ERROR: Engine not specified. Aircraft cannot fly without the engine" << endl;
  89         exit(-1);
  90   }
  91
  92   for (LIST command_line = command_list.begin(); command_line!=command_list.end(); ++command_line)
  93     {
  94       //cout << *command_line << endl;
  95
  96       linetoken1 = engineParts -> getToken(*command_line, 1); // function parameters gettoken(string,tokenNo);
  97       linetoken2 = engineParts -> getToken(*command_line, 2); // 2 represents token No 2
  98
  99       switch(engine_map[linetoken2])
 100             {
 101           case simpleSingle_flag:
 102             {
 103               //c172 engine lines ... looks like 0.83 is just a thrust reduction
 104               /* F_X_engine = Throttle[3]*350/0.83; */
 105               /* F_Z_engine = Throttle[3]*4.9/0.83; */
 106               /* M_m_engine = F_X_engine*0.734*cbar; */
 107               F_X_engine = Throttle[3]*simpleSingleMaxThrust;
 108               break;
 109             }
 110             case c172_flag:
 111               {
 112                 F_X_engine = Throttle[3]*350/0.83;
 113                 F_Z_engine = Throttle[3]*4.9/0.83;
 114                 M_m_engine = F_X_engine*0.734*cbar;
 115                 break;
 116               }
 117             };
 118
 119       Throttle_pct = Throttle[3];
 120       return;
 121     }
 122 }
 123
 124 // end uiuc_engine.cpp