FGAircraft.cpp

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 Module:       FGAircraft.cpp
 Author:       Jon S. Berndt
 Date started: 12/12/98
 Purpose:      Encapsulates an aircraft
 Called by:    FGFDMExec
 
 ------------- Copyright (C) 1999  Jon S. Berndt (jon@jsbsim.org) -------------
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser 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 Lesser General Public License for more
 details.
 
 You should have received a copy of the GNU Lesser 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 Lesser General Public License can also be
 found on the world wide web at http://www.gnu.org.
 
FUNCTIONAL DESCRIPTION
--------------------------------------------------------------------------------
Models the aircraft reactions and forces. This class is instantiated by the
FGFDMExec class and scheduled as an FDM entry.
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
COMMENTS, REFERENCES,  and NOTES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
#include "FGAircraft.h"
#include "FGFDMExec.h"
#include "input_output/FGXMLElement.h"
#include "input_output/FGLog.h"
 
using namespace std;
 
namespace JSBSim {
 
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS IMPLEMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
FGAircraft::FGAircraft(FGFDMExec* fdmex) : FGModel(fdmex, "FGAircraft")
{
  WingSpan = 0.0;
  WingArea = 0.0;
  cbar = 0.0;
  HTailArea = VTailArea = 0.0;
  HTailArm  = VTailArm  = 0.0;
  lbarh = lbarv = 0.0;
  vbarh = vbarv = 0.0;
  WingIncidence = 0.0;
 
  bind();
 
  Debug(0);
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
FGAircraft::~FGAircraft()
{
  Debug(1);
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bool FGAircraft::InitModel(void)
{
  if (!FGModel::InitModel()) return false;
 
  vForces.InitMatrix();
  vMoments.InitMatrix();
 
  return true;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bool FGAircraft::Run(bool Holding)
{
  if (FGModel::Run(Holding)) return true;
  if (Holding) return false;
 
  RunPreFunctions();
 
  vForces = in.AeroForce;
  vForces += in.PropForce;
  vForces += in.GroundForce;
  vForces += in.ExternalForce;
  vForces += in.BuoyantForce;
 
  vMoments = in.AeroMoment;
  vMoments += in.PropMoment;
  vMoments += in.GroundMoment;
  vMoments += in.ExternalMoment;
  vMoments += in.BuoyantMoment;
 
  RunPostFunctions();
 
  return false;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bool FGAircraft::Load(Element* el)
{
  string element_name;
  Element* element;
 
  if (!FGModel::Upload(el, true)) return false;
 
  if (el->FindElement("wingarea"))
    WingArea = el->FindElementValueAsNumberConvertTo("wingarea", "FT2");
  if (el->FindElement("wingspan"))
    WingSpan = el->FindElementValueAsNumberConvertTo("wingspan", "FT");
  if (el->FindElement("chord"))
    cbar = el->FindElementValueAsNumberConvertTo("chord", "FT");
  if (el->FindElement("wing_incidence"))
    WingIncidence = el->FindElementValueAsNumberConvertTo("wing_incidence", "RAD");
  if (el->FindElement("htailarea"))
    HTailArea = el->FindElementValueAsNumberConvertTo("htailarea", "FT2");
  if (el->FindElement("htailarm"))
    HTailArm = el->FindElementValueAsNumberConvertTo("htailarm", "FT");
  if (el->FindElement("vtailarea"))
    VTailArea = el->FindElementValueAsNumberConvertTo("vtailarea", "FT2");
  if (el->FindElement("vtailarm"))
    VTailArm = el->FindElementValueAsNumberConvertTo("vtailarm", "FT");
 
  // Find all LOCATION elements that descend from this METRICS branch of the
  // config file. This would be CG location, eyepoint, etc.
 
  element = el->FindElement("location");
  while (element) {
    element_name = element->GetAttributeValue("name");
 
    if (element_name == "AERORP") vXYZrp = element->FindElementTripletConvertTo("IN");
    else if (element_name == "EYEPOINT") vXYZep = element->FindElementTripletConvertTo("IN");
    else if (element_name == "VRP") vXYZvrp = element->FindElementTripletConvertTo("IN");
 
    element = el->FindNextElement("location");
  }
 
  // calculate some derived parameters
  if (cbar != 0.0) {
    lbarh = HTailArm/cbar;
    lbarv = VTailArm/cbar;
    if (WingArea != 0.0) {
      vbarh = HTailArm*HTailArea / (cbar*WingArea);
      vbarv = VTailArm*VTailArea / (WingSpan*WingArea);
    }
  }
 
  PostLoad(el, FDMExec);
 
  Debug(2);
 
  return true;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
void FGAircraft::bind(void)
{
  PropertyManager->Tie("metrics/Sw-sqft", this, &FGAircraft::GetWingArea, &FGAircraft::SetWingArea);
  PropertyManager->Tie("metrics/bw-ft", this, &FGAircraft::GetWingSpan);
  PropertyManager->Tie("metrics/cbarw-ft", this, &FGAircraft::Getcbar);
  PropertyManager->Tie("metrics/iw-rad", this, &FGAircraft::GetWingIncidence);
  PropertyManager->Tie("metrics/iw-deg", this, &FGAircraft::GetWingIncidenceDeg);
  PropertyManager->Tie("metrics/Sh-sqft", this, &FGAircraft::GetHTailArea);
  PropertyManager->Tie("metrics/lh-ft", this, &FGAircraft::GetHTailArm);
  PropertyManager->Tie("metrics/Sv-sqft", this, &FGAircraft::GetVTailArea);
  PropertyManager->Tie("metrics/lv-ft", this, &FGAircraft::GetVTailArm);
  PropertyManager->Tie("metrics/lh-norm", this, &FGAircraft::Getlbarh);
  PropertyManager->Tie("metrics/lv-norm", this, &FGAircraft::Getlbarv);
  PropertyManager->Tie("metrics/vbarh-norm", this, &FGAircraft::Getvbarh);
  PropertyManager->Tie("metrics/vbarv-norm", this, &FGAircraft::Getvbarv);
  PropertyManager->Tie("metrics/aero-rp-x-in", this, eX, &FGAircraft::GetXYZrp, &FGAircraft::SetXYZrp);
  PropertyManager->Tie("metrics/aero-rp-y-in", this, eY, &FGAircraft::GetXYZrp, &FGAircraft::SetXYZrp);
  PropertyManager->Tie("metrics/aero-rp-z-in", this, eZ, &FGAircraft::GetXYZrp, &FGAircraft::SetXYZrp);
  PropertyManager->Tie("metrics/eyepoint-x-in", this, eX, &FGAircraft::GetXYZep);
  PropertyManager->Tie("metrics/eyepoint-y-in", this, eY,&FGAircraft::GetXYZep);
  PropertyManager->Tie("metrics/eyepoint-z-in", this, eZ, &FGAircraft::GetXYZep);
  PropertyManager->Tie("metrics/visualrefpoint-x-in", this, eX, &FGAircraft::GetXYZvrp);
  PropertyManager->Tie("metrics/visualrefpoint-y-in", this, eY, &FGAircraft::GetXYZvrp);
  PropertyManager->Tie("metrics/visualrefpoint-z-in", this, eZ, &FGAircraft::GetXYZvrp);
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//    The bitmasked value choices are as follows:
//    unset: In this case (the default) JSBSim would only print
//       out the normally expected messages, essentially echoing
//       the config files as they are read. If the environment
//       variable is not set, debug_lvl is set to 1 internally
//    0: This requests JSBSim not to output any messages
//       whatsoever.
//    1: This value explicity requests the normal JSBSim
//       startup messages
//    2: This value asks for a message to be printed out when
//       a class is instantiated
//    4: When this value is set, a message is displayed when a
//       FGModel object executes its Run() method
//    8: When this value is set, various runtime state variables
//       are printed out periodically
//    16: When set various parameters are sanity checked and
//       a message is printed out when they go out of bounds
 
void FGAircraft::Debug(int from)
{
  if (debug_lvl <= 0) return;
 
  if (debug_lvl & 1) { // Standard console startup message output
    if (from == 2) { // Loading
      FGLogging log(LogLevel::DEBUG);
      log << "\n  Aircraft Metrics:\n"  << fixed;
      log << "    WingArea: " << WingArea  << "\n";
      log << "    WingSpan: " << WingSpan  << "\n";
      log << "    Incidence: " << WingIncidence << "\n";
      log << "    Chord: " << cbar << "\n";
      log << "    H. Tail Area: " << HTailArea << "\n";
      log << "    H. Tail Arm: " << HTailArm << "\n";
      log << "    V. Tail Area: " << VTailArea << "\n";
      log << "    V. Tail Arm: " << VTailArm << "\n";
      log << "    Eyepoint (x, y, z): " << vXYZep << "\n";
      log << "    Ref Pt (x, y, z): " << vXYZrp << "\n";
      log << "    Visual Ref Pt (x, y, z): " << vXYZvrp << "\n";
    }
  }
  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
    FGLogging log(LogLevel::DEBUG);
    if (from == 0) log << "Instantiated: FGAircraft\n";
    if (from == 1) log << "Destroyed:    FGAircraft\n";
  }
  if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
  }
  if (debug_lvl & 8 ) { // Runtime state variables
  }
  if (debug_lvl & 16) { // Sanity checking
  }
  if (debug_lvl & 64) {
    if (from == 0) { // Constructor
    }
  }
}
 
} // namespace JSBSim