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Added stall hysteresis modeling, nose should fall through nicely in a stall now.

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This commit is contained in:
tony 2002-05-04 17:38:06 +00:00
parent cd041af9d8
commit be71e0f555
4 changed files with 36 additions and 6 deletions
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30
src/FDM/JSBSim/FGAircraft.cpp
View file

@ -103,8 +103,9 @@ FGAircraft::FGAircraft(FGFDMExec* fdmex) : FGModel(fdmex)
{
Name = "FGAircraft";
WingIncidence = 0.0;
impending_stall = 0.0;
impending_stall = stall_hyst = 0.0;
alphaclmin = alphaclmax = 0.0;
alphahystmin = alphahystmax = 0.0;
HTailArea = VTailArea = 0.0;
HTailArm = VTailArm = 0.0;
lbarh = lbarv = 0.0;
@ -130,6 +131,7 @@ FGAircraft::~FGAircraft()
bool FGAircraft::Run(void)
{
double twovel;
double alpha;
if (!FGModel::Run()) { // if false then execute this Run()
vForces.InitMatrix();
@ -158,13 +160,25 @@ bool FGAircraft::Run(void)
alphaw = Translation->Getalpha() + WingIncidence;
alpha=Translation->Getalpha();
if (alphaclmax != 0) {
if (Translation->Getalpha() > 0.85*alphaclmax) {
impending_stall = 10*(Translation->Getalpha()/alphaclmax - 0.85);
if (alpha > 0.85*alphaclmax) {
impending_stall = 10*(alpha/alphaclmax - 0.85);
} else {
impending_stall = 0;
}
}
}
if(alphahystmax != 0.0 && alphahystmin != 0.0) {
if( alpha > alphahystmax ) {
stall_hyst = 1;
} else if(alpha < alphahystmin) {
stall_hyst = 0;
}
}
return false;
} else { // skip Run() execution this time
@ -256,6 +270,11 @@ bool FGAircraft::Load(FGConfigFile* AC_cfg)
if (debug_lvl > 0) cout << " Maximum Alpha: " << alphaclmax
<< " Minimum Alpha: " << alphaclmin
<< endl;
} else if (parameter == "AC_HYSTLIMITS") {
*AC_cfg >> alphahystmin >> alphahystmax;
if (debug_lvl > 0) cout << " Hysteresis Start: " << alphahystmax
<< " Hysteresis End: " << alphahystmin
<< endl;
} else if (parameter == "AC_POINTMASS") {
*AC_cfg >> pmWt >> pmX >> pmY >> pmZ;
MassBalance->AddPointMass(pmWt, pmX, pmY, pmZ);
@ -346,6 +365,9 @@ void FGAircraft::bind(void)
&FGAircraft::GetAlphaW);
PropertyManager->Tie("systems/stall-warn-norm", this,
&FGAircraft::GetStallWarn);
PropertyManager->Tie("aero/stall-hyst-norm", this,
&FGAircraft::GetHysteresisParm);
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

8
src/FDM/JSBSim/FGAircraft.h
View file

@ -160,6 +160,11 @@ public:
inline double GetXYZep(int idx) const { return vXYZep(idx); }
inline double GetAlphaCLMax(void) const { return alphaclmax; }
inline double GetAlphaCLMin(void) const { return alphaclmin; }
inline double GetAlphaHystMax(void) const { return alphahystmax; }
inline double GetAlphaHystMin(void) const { return alphahystmin; }
inline double GetHysteresisParm(void) const { return stall_hyst; }
inline void SetAlphaCLMax(double tt) { alphaclmax=tt; }
inline void SetAlphaCLMin(double tt) { alphaclmin=tt; }
@ -193,7 +198,8 @@ private:
double HTailArea, VTailArea, HTailArm, VTailArm;
double lbarh,lbarv,vbarh,vbarv;
double alphaclmax,alphaclmin;
double impending_stall;
double alphahystmax, alphahystmin;
double impending_stall, stall_hyst;
double bi2vel, ci2vel,alphaw;
string AircraftName;

3
src/FDM/JSBSim/FGJSBBase.h
View file

@ -164,7 +164,8 @@ enum eParam {
FG_VBARH, //horizontal tail volume
FG_VBARV, //vertical tail volume
FG_GEAR_CMD,
FG_GEAR_POS
FG_GEAR_POS,
FG_HYSTPARM
};
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

1
src/FDM/JSBSim/FGState.cpp
View file

@ -575,6 +575,7 @@ void FGState::InitPropertyMaps(void)
ParamNameToProp[ "FG_VBARV" ]="metrics/vbarv-norm";
ParamNameToProp[ "FG_GEAR_CMD" ]="gear/gear-cmd-norm";
ParamNameToProp[ "FG_GEAR_POS" ]="gear/gear-pos-norm";
ParamNameToProp[ "FG_HYSTPARM" ]="aero/stall-hyst-norm";
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%