Date started: 01/21/99
Called by: FGAircraft
- ------------- Copyright (C) 1999 Jon S. Berndt (jsb@hal-pc.org) -------------
+ ------------- 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
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
-#ifdef FGFS
-# include <simgear/compiler.h>
-# ifdef SG_HAVE_STD_INCLUDES
-# include <fstream>
-# else
-# include <fstream.h>
-# endif
-#else
-# if defined(sgi) && !defined(__GNUC__) && (_COMPILER_VERSION < 740)
-# include <fstream.h>
-# else
-# include <fstream>
-# endif
-#endif
-
#include "FGEngine.h"
#include "FGTank.h"
#include "FGPropeller.h"
#include "FGNozzle.h"
-#include <input_output/FGXMLParse.h>
-#include <math/FGColumnVector3.h>
+#include "FGRotor.h"
+#include "models/FGPropulsion.h"
+#include "input_output/FGXMLParse.h"
+#include "math/FGColumnVector3.h"
+
+#include <iostream>
+#include <fstream>
+#include <cstdlib>
+
+using namespace std;
namespace JSBSim {
-static const char *IdSrc = "$Id$";
+static const char *IdSrc = "$Id: FGEngine.cpp,v 1.40 2010/10/15 11:32:41 jberndt Exp $";
static const char *IdHdr = ID_ENGINE;
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Type = etUnknown;
X = Y = Z = 0.0;
EnginePitch = EngineYaw = 0.0;
- SLFuelFlowMax = SLOxiFlowMax = 0.0;
+ SLFuelFlowMax = 0.0;
MaxThrottle = 1.0;
MinThrottle = 0.0;
+ FuelDensity = 6.0;
+ unsigned int i;
ResetToIC(); // initialize dynamic terms
FDMExec = exec;
- State = FDMExec->GetState();
Atmosphere = FDMExec->GetAtmosphere();
FCS = FDMExec->GetFCS();
Propulsion = FDMExec->GetPropulsion();
Name = engine_element->GetAttributeValue("name");
+ Load(engine_element, PropertyManager, to_string(EngineNumber)); // Call ModelFunctions loader
+
// Find and set engine location
local_element = engine_element->GetParent()->FindElement("location");
// Load thruster
local_element = engine_element->GetParent()->FindElement("thruster");
if (local_element) {
- if (!LoadThruster(local_element)) exit(-1);
+ try {
+ if (!LoadThruster(local_element)) exit(-1);
+ } catch (std::string str) {
+ throw("Error loading engine " + Name + ". " + str);
+ }
} else {
cerr << "No thruster definition supplied with engine definition." << endl;
}
+ // Build and initialize the feed tank vector.
+ for (i=0; i<(Propulsion->GetNumTanks()); i++) {
+ SourceTanks.push_back(0);
+ }
+
// Load feed tank[s] references
local_element = engine_element->GetParent()->FindElement("feed");
if (local_element) {
while (local_element) {
- AddFeedTank((int)local_element->GetDataAsNumber());
+ int tankID = (int)local_element->GetDataAsNumber();
+ FGTank* tank = Propulsion->GetTank(tankID);
+ if (tank) {
+ AddFeedTank(tankID, tank->GetPriority());
+ FuelDensity = tank->GetDensity();
+ } else {
+ cerr << "Feed tank " << tankID <<
+ " specified in engine definition does not exist." << endl;
+ }
local_element = engine_element->GetParent()->FindNextElement("feed");
}
} else {
cerr << "No feed tank specified in engine definition." << endl;
}
- char property_name[80];
- snprintf(property_name, 80, "propulsion/engine[%d]/set-running", EngineNumber);
- PropertyManager->Tie( property_name, (FGEngine*)this, &FGEngine::GetRunning,
- &FGEngine::SetRunning );
+ string property_name, base_property_name;
+ base_property_name = CreateIndexedPropertyName("propulsion/engine", EngineNumber);
+
+ property_name = base_property_name + "/set-running";
+ PropertyManager->Tie( property_name.c_str(), this, &FGEngine::GetRunning, &FGEngine::SetRunning );
+ property_name = base_property_name + "/thrust-lbs";
+ PropertyManager->Tie( property_name.c_str(), Thruster, &FGThruster::GetThrust);
+ property_name = base_property_name + "/fuel-flow-rate-pps";
+ PropertyManager->Tie( property_name.c_str(), this, &FGEngine::GetFuelFlowRate);
+
+ PostLoad(engine_element, PropertyManager, to_string(EngineNumber));
+
+ //cout << "Engine[" << EngineNumber << "] using fuel density: " << FuelDensity << endl;
Debug(0);
}
void FGEngine::ResetToIC(void)
{
- Thrust = 0.0;
Throttle = 0.0;
Mixture = 1.0;
Starter = false;
- FuelNeed = OxidizerNeed = 0.0;
+ FuelExpended = 0.0;
Starved = Running = Cranking = false;
PctPower = 0.0;
TrimMode = false;
FuelFlow_gph = 0.0;
FuelFlow_pph = 0.0;
+ FuelFlowRate = 0.0;
FuelFreeze = false;
}
// derived class' Calculate() function before any other calculations are done.
// This base class method removes fuel from the fuel tanks as appropriate,
// and sets the starved flag if necessary.
+// This version of the fuel consumption code should never see an oxidizer tank.
void FGEngine::ConsumeFuel(void)
{
if (TrimMode) return;
unsigned int i;
- double Fshortage, Oshortage, TanksWithFuel, TanksWithOxidizer;
+ double Fshortage, FuelNeeded;
FGTank* Tank;
- bool haveOxTanks = false;
- Fshortage = Oshortage = TanksWithFuel = TanksWithOxidizer = 0.0;
-
- // count how many assigned tanks have fuel
- for (i=0; i<SourceTanks.size(); i++) {
- Tank = Propulsion->GetTank(SourceTanks[i]);
- if (Tank->GetType() == FGTank::ttFUEL){
- if (Tank->GetContents() > 0.0) ++TanksWithFuel;
- } else if (Tank->GetType() == FGTank::ttOXIDIZER) {
- haveOxTanks = true;
- if (Tank->GetContents() > 0.0) ++TanksWithOxidizer;
+ unsigned int TanksWithFuel = 0;
+ Fshortage = FuelNeeded = 0.0;
+ double FuelToBurn;
+ unsigned int CurrentPriority = 1;
+ vector <int> FeedList;
+ Starved = false;
+
+ FuelToBurn = CalcFuelNeed();
+ if (FuelToBurn == 0.0) return;
+
+ // Count how many fuel tanks with the current priority level have fuel.
+ // If none, then try next lower priority. Build the feed list.
+ while ((TanksWithFuel == 0) && (CurrentPriority <= Propulsion->GetNumTanks())) {
+ for (i=0; i<Propulsion->GetNumTanks(); i++) {
+ if (SourceTanks[i] != 0) {
+ Tank = Propulsion->GetTank(i);
+ if (Tank->GetType() == FGTank::ttFUEL) {
+ if ((Tank->GetContents() > 0.0) && ((unsigned int)Tank->GetPriority() == CurrentPriority)) {
+ ++TanksWithFuel;
+ FeedList.push_back(i);
+ }
+ } else {
+ cerr << "No oxidizer tanks should be used for this engine type." << endl;
+ }
+ }
}
+ if (TanksWithFuel == 0) CurrentPriority++;
}
- if (TanksWithFuel==0 || (haveOxTanks && TanksWithOxidizer==0)) {
+
+ // No fuel found at any priority!
+ if (TanksWithFuel == 0) {
Starved = true;
return;
}
- for (i=0; i<SourceTanks.size(); i++) {
- Tank = Propulsion->GetTank(SourceTanks[i]);
- if (Tank->GetType() == FGTank::ttFUEL) {
- Fshortage += Tank->Drain(CalcFuelNeed()/TanksWithFuel);
- } else if (Tank->GetType() == FGTank::ttOXIDIZER) {
- Oshortage += Tank->Drain(CalcOxidizerNeed()/TanksWithOxidizer);
- }
+ // Remove equal amount of fuel from each feed tank.
+ FuelNeeded = FuelToBurn/TanksWithFuel;
+ for (i=0; i<FeedList.size(); i++) {
+ Tank = Propulsion->GetTank(FeedList[i]);
+ Tank->Drain(FuelNeeded);
}
- if (Fshortage < 0.00 || Oshortage < 0.00) Starved = true;
- else Starved = false;
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
double FGEngine::CalcFuelNeed(void)
{
- FuelNeed = SLFuelFlowMax*PctPower*State->Getdt()*Propulsion->GetRate();
- return FuelNeed;
-}
-
-//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-double FGEngine::CalcOxidizerNeed(void)
-{
- OxidizerNeed = SLOxiFlowMax*PctPower*State->Getdt()*Propulsion->GetRate();
- return OxidizerNeed;
+ double dT = FDMExec->GetDeltaT()*Propulsion->GetRate();
+ FuelFlowRate = SLFuelFlowMax*PctPower;
+ FuelExpended = FuelFlowRate*dT;
+ return FuelExpended;
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-void FGEngine::AddFeedTank(int tkID)
+void FGEngine::AddFeedTank(int tkID, int priority)
{
- SourceTanks.push_back(tkID);
+ SourceTanks[tkID] = priority;
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
{
string token, fullpath, localpath;
string thruster_filename, thruster_fullpathname, thrType;
- double P_Factor = 0, Sense = 0.0;
string enginePath = FDMExec->GetEnginePath();
string aircraftPath = FDMExec->GetFullAircraftPath();
ifstream thruster_file;
FGColumnVector3 location, orientation;
string separator = "/";
-# ifdef macintosh
- separator = ";";
-# endif
-
fullpath = enginePath + separator;
localpath = aircraftPath + separator + "Engines" + separator;
Thruster = new FGPropeller(FDMExec, document, EngineNumber);
} else if (thrType == "nozzle") {
Thruster = new FGNozzle(FDMExec, document, EngineNumber);
+ } else if (thrType == "rotor") {
+ Thruster = new FGRotor(FDMExec, document, EngineNumber);
} else if (thrType == "direct") {
Thruster = new FGThruster( FDMExec, document, EngineNumber);
}
- Thruster->SetdeltaT(State->Getdt() * Propulsion->GetRate());
+ Thruster->SetdeltaT(FDMExec->GetDeltaT() * Propulsion->GetRate());
Debug(2);
return true;
projects / flightgear.git / blobdiff