-/*******************************************************************************
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Module: FGRocket.cpp
Author: Jon S. Berndt
--------------------------------------------------------------------------------
09/12/2000 JSB Created
-********************************************************************************
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
-*******************************************************************************/
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
#include "FGRocket.h"
-/*******************************************************************************
-************************************ CODE **************************************
-*******************************************************************************/
+static const char *IdSrc = "$Id$";
+static const char *IdHdr = ID_ROCKET;
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+CLASS IMPLEMENTATION
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
-FGRocket::FGRocket(FGFDMExec* fdex, string enginePath, string engineName, int num) :
- FGEngine(fdex, enginePath, engineName, num)
+FGRocket::FGRocket(FGFDMExec* exec, FGConfigFile* Eng_cfg) : FGEngine(exec)
{
- //
+ string token;
+
+ Name = Eng_cfg->GetValue("NAME");
+ Eng_cfg->GetNextConfigLine();
+
+ while (Eng_cfg->GetValue() != string("/FG_ROCKET")) {
+ *Eng_cfg >> token;
+ if (token == "SHR") *Eng_cfg >> SHR;
+ else if (token == "MAX_PC") *Eng_cfg >> maxPC;
+ else if (token == "PROP_EFF") *Eng_cfg >> propEff;
+ else if (token == "MAXTHROTTLE") *Eng_cfg >> MaxThrottle;
+ else if (token == "MINTHROTTLE") *Eng_cfg >> MinThrottle;
+ else if (token == "SLFUELFLOWMAX") *Eng_cfg >> SLFuelFlowMax;
+ else if (token == "SLOXIFLOWMAX") *Eng_cfg >> SLOxiFlowMax;
+ else if (token == "VARIANCE") *Eng_cfg >> Variance;
+ else cerr << "Unhandled token in Engine config file: " << token << endl;
+ }
+
+ Debug(0);
+
+ EngineNumber = 0;
+ Type = etRocket;
+
+ PC = 0.0;
+ kFactor = (2.0*SHR*SHR/(SHR-1.0))*pow(2.0/(SHR+1), (SHR+1)/(SHR-1));
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+FGRocket::~FGRocket()
+{
+ Debug(1);
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+double FGRocket::Calculate(double pe)
+{
+ double Cf=0;
+
+ ConsumeFuel();
+
+ Throttle = FCS->GetThrottlePos(EngineNumber);
+
+ if (Throttle < MinThrottle || Starved) {
+ PctPower = Thrust = 0.0; // desired thrust
+ Flameout = true;
+ PC = 0.0;
+ } else {
+ PctPower = Throttle / MaxThrottle;
+ PC = maxPC*PctPower * (1.0 + Variance * ((double)rand()/(double)RAND_MAX - 0.5));
+ Cf = sqrt(kFactor*(1 - pow(pe/(PC), (SHR-1)/SHR)));
+ Flameout = false;
+ }
+
+ return Cf*maxPC*PctPower*propEff;
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+// 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 FGRocket::Debug(int from)
+{
+ if (debug_lvl <= 0) return;
+
+ if (debug_lvl & 1) { // Standard console startup message output
+ if (from == 0) { // Constructor
+ cout << " Engine Name: " << Name << endl;
+ cout << " Specific Heat Ratio = " << SHR << endl;
+ cout << " Maximum Chamber Pressure = " << maxPC << endl;
+ cout << " Propulsive Efficiency = " << propEff << endl;
+ cout << " MaxThrottle = " << MaxThrottle << endl;
+ cout << " MinThrottle = " << MinThrottle << endl;
+ cout << " FuelFlowMax = " << SLFuelFlowMax << endl;
+ cout << " OxiFlowMax = " << SLOxiFlowMax << endl;
+ cout << " Variance = " << Variance << endl;
+ }
+ }
+ if (debug_lvl & 2 ) { // Instantiation/Destruction notification
+ if (from == 0) cout << "Instantiated: FGRocket" << endl;
+ if (from == 1) cout << "Destroyed: FGRocket" << 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;
+ }
+ }
}