Check return value of FDM::init().

[flightgear.git] / src / FDM / JSBSim / FGAuxiliary.cpp

diff --git a/src/FDM/JSBSim/FGAuxiliary.cpp b/src/FDM/JSBSim/FGAuxiliary.cpp
index 232e05f09fcbc94c7fcb74db04056a54d9a4ecda..4b6d09169d7875f453aab83759f4911dc9950f42 100644 (file)
--- a/src/FDM/JSBSim/FGAuxiliary.cpp
+++ b/src/FDM/JSBSim/FGAuxiliary.cpp
@@ -1,39 +1,41 @@
 /*******************************************************************************
-
+ 
  Module:       FGAuxiliary.cpp
  Author:       Jon Berndt
  Date started: 01/26/99
  Purpose:      Calculates additional parameters needed by the visual system, etc.
  Called by:    FGSimExec
-
+ 
  ------------- Copyright (C) 1999  Jon S. Berndt (jsb@hal-pc.org) -------------
-
+ 
  This program is free software; you can redistribute it and/or modify it under
  the terms of the GNU General Public License as published by the Free Software
  Foundation; either version 2 of the License, or (at your option) any later
  version.
-
+ 
  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  details.
-
+ 
  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  Place - Suite 330, Boston, MA  02111-1307, USA.
-
+ 
  Further information about the GNU General Public License can also be found on
  the world wide web at http://www.gnu.org.
-
+ 
 FUNCTIONAL DESCRIPTION
 --------------------------------------------------------------------------------
-This class calculates various auxiliary parameters, mostly used by the visual
-system
-
+This class calculates various auxiliary parameters.
+ 
+REFERENCES
+  Anderson, John D. "Introduction to Flight", 3rd Edition, McGraw-Hill, 1989
+                    pgs. 112-126
 HISTORY
 --------------------------------------------------------------------------------
 01/26/99   JSB   Created
-
+ 
 ********************************************************************************
 INCLUDES
 *******************************************************************************/
@@ -48,28 +50,71 @@ INCLUDES
 #include "FGAircraft.h"
 #include "FGPosition.h"
 #include "FGOutput.h"
+#include "FGMatrix.h"
+
+static const char *IdSrc = "$Header$";
+static const char *IdHdr = ID_AUXILIARY;
 
 /*******************************************************************************
 ************************************ CODE **************************************
 *******************************************************************************/
 
-FGAuxiliary::FGAuxiliary(FGFDMExec* fdmex) : FGModel(fdmex)
-{
+FGAuxiliary::FGAuxiliary(FGFDMExec* fdmex) : FGModel(fdmex) {
   Name = "FGAuxiliary";
+  vcas = veas = mach = qbar = pt = 0;
+  psl = rhosl = 1;
+  earthPosAngle = 0.0;
 }
 
 
-FGAuxiliary::~FGAuxiliary()
-{
-}
+FGAuxiliary::~FGAuxiliary() {}
+
 
 
-bool FGAuxiliary::Run()
-{
+bool FGAuxiliary::Run() {
+  float A,B,D;
+
   if (!FGModel::Run()) {
+    GetState();
+    if(mach < 1)    //calculate total pressure assuming isentropic flow
+      pt=p*pow((1 + 0.2*mach*mach),3.5);
+    else {
+      // shock in front of pitot tube, we'll assume its normal and use
+      // the Rayleigh Pitot Tube Formula, i.e. the ratio of total
+      // pressure behind the shock to the static pressure in front
+
+      B = 5.76*mach*mach/(5.6*mach*mach - 0.8);
+
+      // The denominator above is zero for Mach ~ 0.38, for which
+      // we'll never be here, so we're safe
+
+      D = (2.8*mach*mach-0.4)*0.4167;
+      pt = p*pow(B,3.5)*D;
+    }
+
+    A = pow(((pt-p)/psl+1),0.28571);
+    vcas = sqrt(7*psl/rhosl*(A-1));
+    veas = sqrt(2*qbar/rhosl);
+    
+    vPilotAccel = Translation->GetUVWdot() + Aircraft->GetXYZep() * Rotation->GetPQRdot();
+    
+    
+    
+    earthPosAngle += State->Getdt()*OMEGA_EARTH;
+
   } else {
   }
+
+
   return false;
 }
 
+void FGAuxiliary::GetState(void) {
+  qbar = Translation->Getqbar();
+  mach = Translation->GetMach();
+  p = Atmosphere->GetPressure();
+  rhosl = Atmosphere->GetDensitySL();
+  psl = Atmosphere->GetPressureSL();
+
+}