fly/flightgear
1
0
Fork 0
Code Activity

JSBSim synchronization.

Browse source 
Added the ability to specify N1 & N2 spool up/down velocity via functions for turbines.
This commit is contained in:
Bertrand Coconnier 2018-01-13 19:48:35 +01:00
parent c9e276e5dd
commit bb315488e1
2 changed files with 43 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

33
src/FDM/JSBSim/models/propulsion/FGTurbine.cpp
View file

@ -59,7 +59,6 @@ IDENT(IdHdr,ID_TURBINE);
CLASS IMPLEMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
FGTurbine::FGTurbine(FGFDMExec* exec, Element *el, int engine_number, struct Inputs& input)
: FGEngine(engine_number, input), FDMExec(exec)
{
@ -198,8 +197,6 @@ double FGTurbine::Off(void)
double FGTurbine::Run()
{
double idlethrust, milthrust, thrust;
double spoolup; // acceleration in pct/sec
double sigma = in.DensityRatio;
double T = in.Temperature;
idlethrust = MilThrust * IdleThrustLookup->GetValue();
@ -208,18 +205,16 @@ double FGTurbine::Run()
Running = true;
Starter = false;
// adjust acceleration for N2 and atmospheric density
double n = N2norm + 0.1;
if (n > 1) n = 1;
spoolup = delay / (1 + 3 * (1-n)*(1-n)*(1-n) + (1 - sigma));
N1_factor = MaxN1 - IdleN1;
N2_factor = MaxN2 - IdleN2;
if ((Injected == 1) && Injection && (InjWaterNorm > 0)) {
N1_factor += InjN1increment;
N2_factor += InjN2increment;
}
N2 = Seek(&N2, IdleN2 + ThrottlePos * N2_factor, spoolup, spoolup * 3.0);
N1 = Seek(&N1, IdleN1 + ThrottlePos * N1_factor, spoolup, spoolup * 2.4);
N2 = Seek(&N2, IdleN2 + ThrottlePos * N2_factor,
N2SpoolUp->GetValue(), N2SpoolDown->GetValue());
N1 = Seek(&N1, IdleN1 + ThrottlePos * N1_factor,
N1SpoolUp->GetValue(), N1SpoolDown->GetValue());
N2norm = (N2 - IdleN2) / N2_factor;
thrust = idlethrust + (milthrust * N2norm * N2norm);
EGT_degC = in.TAT_c + 363.1 + ThrottlePos * 357.1;
@ -424,7 +419,9 @@ bool FGTurbine::Load(FGFDMExec* exec, Element *el)
while(function_element) {
string name = function_element->GetAttributeValue("name");
if (name == "IdleThrust" || name == "MilThrust" || name == "AugThrust" || name == "Injection")
if (name == "IdleThrust" || name == "MilThrust" || name == "AugThrust"
|| name == "Injection" || name == "N1SpoolUp" || name == "N1SpoolDown"
|| name == "N2SpoolUp" || name == "N2SpoolDown")
function_element->SetAttributeValue("name", string("propulsion/engine[#]/") + name);
function_element = el->FindNextElement("function");
@ -481,8 +478,22 @@ bool FGTurbine::Load(FGFDMExec* exec, Element *el)
InjectionLookup = GetPreFunction(property_prefix+"/Injection");
// Pre-calculations and initializations
N1SpoolUp = GetPreFunction(property_prefix+"/N1SpoolUp");
if (!N1SpoolUp)
N1SpoolUp = new FGSpoolUp(this, BypassRatio, 1.0);
N1SpoolDown = GetPreFunction(property_prefix+"/N1SpoolDown");
if (!N1SpoolDown)
N1SpoolDown = new FGSpoolUp(this, BypassRatio, 2.4);
N2SpoolUp = GetPreFunction(property_prefix+"/N2SpoolUp");
if (!N2SpoolUp)
N2SpoolUp = new FGSpoolUp(this, BypassRatio, 1.0);
N2SpoolDown = GetPreFunction(property_prefix+"/N2SpoolDown");
if (!N2SpoolDown)
N2SpoolDown = new FGSpoolUp(this, BypassRatio, 3.0);
delay = 90.0 / (BypassRatio + 3.0);
N1_factor = MaxN1 - IdleN1;
N2_factor = MaxN2 - IdleN2;
OilTemp_degK = in.TAT_c + 273.0;

22
src/FDM/JSBSim/models/propulsion/FGTurbine.h
View file

@ -247,7 +247,6 @@ private:
double MaxN1; ///< N1 at 100% throttle
double MaxN2; ///< N2 at 100% throttle
double IdleFF; ///< Idle Fuel Flow (lbm/hr)
double delay; ///< Inverse spool-up time from idle to 100% (seconds)
double N1_factor; ///< factor to tie N1 and throttle
double N2_factor; ///< factor to tie N2 and throttle
double ThrottlePos; ///< FCS-supplied throttle position - modified for local use!
@ -295,11 +294,32 @@ private:
FGFunction *MaxThrustLookup;
FGFunction *InjectionLookup;
FGFDMExec* FDMExec;
FGParameter *N1SpoolUp;
FGParameter *N1SpoolDown;
FGParameter *N2SpoolUp;
FGParameter *N2SpoolDown;
bool Load(FGFDMExec *exec, Element *el);
void bindmodel(FGPropertyManager* pm);
void Debug(int from);
friend class FGSpoolUp;
};
class FGSpoolUp : public FGParameter
{
public:
FGSpoolUp(FGTurbine* _turb, double BPR, double factor)
: turb(_turb), delay(factor * 90.0 / (BPR + 3.0)) {}
string GetName(void) const { return string(); };
double GetValue(void) const {
// adjust acceleration for N2 and atmospheric density
double n = std::min(1.0, turb->N2norm + 0.1);
return delay / (1 + 3 * (1-n)*(1-n)*(1-n) + (1 - turb->in.DensityRatio));
}
private:
FGTurbine* turb;
double delay; ///< Inverse spool-up time from idle to 100% (seconds)
};
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%