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flightgear/src/FDM/JSBSim/FGTurbine.cpp

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2002-08-29 13:26:49 +00:00
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Module: FGTurbine.cpp
Author: Jon S. Berndt
Date started: 08/23/2002
Purpose: This module models a turbine engine.
------------- Copyright (C) 2002 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 descends from the FGEngine class and models a Turbine engine based
on parameters given in the engine config file for this class
HISTORY
--------------------------------------------------------------------------------
08/23/2002 JSB Created
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
#include <vector>
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#include "FGTurbine.h"
namespace JSBSim {
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static const char *IdSrc = "$Id$";
static const char *IdHdr = ID_TURBINE;
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS IMPLEMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
FGTurbine::FGTurbine(FGFDMExec* exec, FGConfigFile* cfg) : FGEngine(exec)
{
Load(cfg);
PowerCommand=0;
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Debug(0);
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
FGTurbine::~FGTurbine()
{
Debug(1);
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
double FGTurbine::Calculate(double dummy)
{
double idle,mil,aug;
double throttle=FCS->GetThrottlePos(EngineNumber);
double dt=State->Getdt();
if( dt > 0 ) {
PowerCommand+=dt*PowerLag( PowerCommand,
ThrottleToPowerCommand(throttle) );
if(PowerCommand > 100 )
PowerCommand=100;
else if(PowerCommand < 0 )
PowerCommand=0;
} else {
PowerCommand=ThrottleToPowerCommand(throttle);
}
mil=MaxMilThrust*ThrustTables[1]->TotalValue();
if( PowerCommand <= 50 ) {
idle=MaxMilThrust*ThrustTables[0]->TotalValue();
Thrust = idle + (mil-idle)*PowerCommand*0.02;
} else {
aug=MaxAugThrust*ThrustTables[2]->TotalValue();
Thrust = mil + (aug-mil)*(PowerCommand-50)*0.02;
}
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ConsumeFuel();
return Thrust;
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}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
double FGTurbine::ThrottleToPowerCommand(double throttle) {
if( throttle <= 0.77 )
return 64.94*throttle;
else
return 217.38*throttle - 117.38;
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
double FGTurbine::PowerLag(double actual_power, double power_command) {
double t, p2;
if( power_command >= 50 ) {
if( actual_power >= 50 ) {
t=5;
p2=power_command;
} else {
p2=60;
t=rtau(p2-actual_power);
}
} else {
if( actual_power >= 50 ) {
t=5;
p2=40;
} else {
p2=power_command;
t=rtau(p2-actual_power);
}
}
return t*(p2-actual_power);
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
double FGTurbine::rtau(double delta_power) {
if( delta_power <= 25 )
return 1.0;
else if ( delta_power >= 50)
return 0.1;
else
return 1.9-0.036*delta_power;
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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void FGTurbine::doInlet(void)
{
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
void FGTurbine::doCompressor(void)
{
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
void FGTurbine::doBleedDuct(void)
{
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
void FGTurbine::doCombustor(void)
{
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
void FGTurbine::doTurbine(void)
{
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
void FGTurbine::doConvergingNozzle(void)
{
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
void FGTurbine::doTransition(void)
{
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
bool FGTurbine::Load(FGConfigFile *Eng_cfg)
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{
int i;
string token;
Name = Eng_cfg->GetValue("NAME");
cout << Name << endl;
Eng_cfg->GetNextConfigLine();
*Eng_cfg >> token >> MaxMilThrust;
*Eng_cfg >> token >> MaxAugThrust;
i=0;
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while( Eng_cfg->GetValue() != string("/FG_TURBINE") && i < 10){
ThrustTables.push_back( new FGCoefficient(FDMExec) );
ThrustTables.back()->Load(Eng_cfg);
i++;
}
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return true;
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}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
// 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 FGTurbine::Debug(int from)
{
if (debug_lvl <= 0) return;
if (debug_lvl & 1) { // Standard console startup message output
if (from == 0) { // Constructor
}
}
if (debug_lvl & 2 ) { // Instantiation/Destruction notification
if (from == 0) cout << "Instantiated: FGTurbine" << endl;
if (from == 1) cout << "Destroyed: FGTurbine" << 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
cout << IdSrc << endl;
cout << IdHdr << endl;
}
}
}
}