FGElectric.cpp

Go to the documentation of this file.

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 Module:       FGElectric.cpp
 Author:       David Culp
 Date started: 04/07/2004
 Purpose:      This module models an electric motor
 
 --------- Copyright (C) 2004  David Culp (davidculp2@comcast.net) -------------
 
 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
--------------------------------------------------------------------------------
 
This class descends from the FGEngine class and models an electric motor based on
parameters given in the engine config file for this class
 
HISTORY
--------------------------------------------------------------------------------
04/07/2004  DPC  Created
01/06/2005  DPC  Converted to new XML format
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
#include <iostream>
#include <sstream>
 
#include "FGFDMExec.h"
#include "FGElectric.h"
#include "FGPropeller.h"
#include "input_output/FGXMLElement.h"
 
using namespace std;
 
namespace JSBSim {
 
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS IMPLEMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
FGElectric::FGElectric(FGFDMExec* exec, Element *el, int engine_number, struct FGEngine::Inputs& input)
  : FGEngine(engine_number, input)
{
  Load(exec,el);
 
  Type = etElectric;
  PowerWatts = 745.7;
  hptowatts = 745.7;
 
  if (el->FindElement("power"))
    PowerWatts = el->FindElementValueAsNumberConvertTo("power","WATTS");
 
  string base_property_name = CreateIndexedPropertyName("propulsion/engine",
                                                        EngineNumber);
  exec->GetPropertyManager()->Tie(base_property_name + "/power-hp", &HP);
 
  Debug(0); // Call Debug() routine from constructor if needed
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
FGElectric::~FGElectric()
{
  Debug(1); // Call Debug() routine from constructor if needed
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
void FGElectric::Calculate(void)
{
  RunPreFunctions();
 
  if (Thruster->GetType() == FGThruster::ttPropeller) {
    ((FGPropeller*)Thruster)->SetAdvance(in.PropAdvance[EngineNumber]);
    ((FGPropeller*)Thruster)->SetFeather(in.PropFeather[EngineNumber]);
  }
 
  RPM = Thruster->GetRPM() * Thruster->GetGearRatio();
 
  HP = PowerWatts * in.ThrottlePos[EngineNumber] / hptowatts;
 
  LoadThrusterInputs();
  // Filters out negative powers when the propeller is not rotating.
  double power = HP * hptoftlbssec;
  if (RPM <= 0.1) power = max(power, 0.0);
  Thruster->Calculate(power);
 
  RunPostFunctions();
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
double FGElectric::CalcFuelNeed(void)
{
  return 0;
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
string FGElectric::GetEngineLabels(const string& delimiter)
{
  std::ostringstream buf;
 
  buf << Name << " HP (engine " << EngineNumber << ")" << delimiter
      << Thruster->GetThrusterLabels(EngineNumber, delimiter);
 
  return buf.str();
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
string FGElectric::GetEngineValues(const string& delimiter)
{
  std::ostringstream buf;
 
  buf << HP << delimiter
     << Thruster->GetThrusterValues(EngineNumber, delimiter);
 
  return buf.str();
}
 
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//
//    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 FGElectric::Debug(int from)
{
  if (debug_lvl <= 0) return;
 
  if (debug_lvl & 1) { // Standard console startup message output
    if (from == 0) { // Constructor
 
      cout << "\n    Engine Name: "         << Name << endl;
      cout << "      Power Watts: "         << PowerWatts << endl;
 
    }
  }
  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
    if (from == 0) cout << "Instantiated: FGElectric" << endl;
    if (from == 1) cout << "Destroyed:    FGElectric" << endl;
  }
  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