11/24/98 JSB Created
07/23/99 TP Added implementation of 1959 Standard Atmosphere
Moved calculation of Mach number to FGTranslation
+ Later updated to '76 model
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COMMENTS, REFERENCES, and NOTES
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FGAtmosphere::FGAtmosphere(FGFDMExec* fdmex) : FGModel(fdmex)
{
Name = "FGAtmosphere";
- lastIndex=0;
- h = 0;
+ lastIndex = 0;
+ h = 0.0;
+ psiw = 0.0;
htab[0]=0;
htab[1]=36089.239;
htab[2]=65616.798;
FGModel::InitModel();
Calculate(h);
- SLtemperature = temperature;
- SLpressure = pressure;
- SLdensity = density;
- SLsoundspeed = sqrt(SHRatio*Reng*temperature);
- rSLtemperature = 1.0/temperature;
- rSLpressure = 1.0/pressure;
- rSLdensity = 1.0/density;
+ SLtemperature = intTemperature;
+ SLpressure = intPressure;
+ SLdensity = intDensity;
+ SLsoundspeed = sqrt(SHRatio*Reng*intTemperature);
+ rSLtemperature = 1.0/intTemperature;
+ rSLpressure = 1.0/intPressure;
+ rSLdensity = 1.0/intDensity;
rSLsoundspeed = 1.0/SLsoundspeed;
+ temperature=&intTemperature;
+ pressure=&intPressure;
+ density=&intDensity;
+
useExternal=false;
return true;
if (!useExternal) {
h = Position->Geth();
Calculate(h);
- } else {
- density = exDensity;
- pressure = exPressure;
- temperature = exTemperature;
- }
+ }
if (turbType != ttNone) {
Turbulence();
if (psiw < 0) psiw += 2*M_PI;
- soundspeed = sqrt(SHRatio*Reng*temperature);
+ soundspeed = sqrt(SHRatio*Reng*(*temperature));
State->Seta(soundspeed);
i = lastIndex-1;
while (htab[i] > altitude) i--;
}
- } else if (altitude > htab[lastIndex+1]){
- if (altitude >= htab[7]){
+ } else if (altitude > htab[lastIndex+1]) {
+ if (altitude >= htab[7]) {
i = 7;
altitude = htab[7];
} else {
i = lastIndex+1;
- while(htab[i+1] < altitude) i++;
+ while (htab[i+1] < altitude) i++;
}
}
}
if (slope == 0) {
- temperature = reftemp;
- pressure = refpress*exp(-Inertial->SLgravity()/(reftemp*Reng)*(altitude-htab[i]));
- //density = refdens*exp(-Inertial->SLgravity()/(reftemp*Reng)*(altitude-htab[i]));
- density = pressure/(Reng*temperature);
+ intTemperature = reftemp;
+ intPressure = refpress*exp(-Inertial->SLgravity()/(reftemp*Reng)*(altitude-htab[i]));
+ //intDensity = refdens*exp(-Inertial->SLgravity()/(reftemp*Reng)*(altitude-htab[i]));
+ intDensity = intPressure/(Reng*intTemperature);
} else {
- temperature = reftemp+slope*(altitude-htab[i]);
- pressure = refpress*pow(temperature/reftemp,-Inertial->SLgravity()/(slope*Reng));
- //density = refdens*pow(temperature/reftemp,-(Inertial->SLgravity()/(slope*Reng)+1));
- density = pressure/(Reng*temperature);
+ intTemperature = reftemp+slope*(altitude-htab[i]);
+ intPressure = refpress*pow(intTemperature/reftemp,-Inertial->SLgravity()/(slope*Reng));
+ //intDensity = refdens*pow(intTemperature/reftemp,-(Inertial->SLgravity()/(slope*Reng)+1));
+ intDensity = intPressure/(Reng*intTemperature);
}
lastIndex=i;
- //cout << "Atmosphere: h=" << altitude << " rho= " << density << endl;
+ //cout << "Atmosphere: h=" << altitude << " rho= " << intDensity << endl;
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
}
}
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+void FGAtmosphere::UseExternal(void) {
+ temperature=&exTemperature;
+ pressure=&exPressure;
+ density=&exDensity;
+ useExternal=true;
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+void FGAtmosphere::UseInternal(void) {
+ temperature=&intTemperature;
+ pressure=&intPressure;
+ density=&intDensity;
+ useExternal=false;
+}
+
+
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void FGAtmosphere::bind(void)
{
+ typedef double (FGAtmosphere::*PMF)(int) const;
PropertyManager->Tie("atmosphere/T-R", this,
&FGAtmosphere::GetTemperature);
PropertyManager->Tie("atmosphere/rho-slugs_ft3", this,
PropertyManager->Tie("atmosphere/psiw-rad", this,
&FGAtmosphere::GetWindPsi);
PropertyManager->Tie("atmosphere/p-turb-rad_sec", this,1,
- &FGAtmosphere::GetTurbPQR);
+ (PMF)&FGAtmosphere::GetTurbPQR);
PropertyManager->Tie("atmosphere/q-turb-rad_sec", this,2,
- &FGAtmosphere::GetTurbPQR);
+ (PMF)&FGAtmosphere::GetTurbPQR);
PropertyManager->Tie("atmosphere/r-turb-rad_sec", this,3,
- &FGAtmosphere::GetTurbPQR);
+ (PMF)&FGAtmosphere::GetTurbPQR);
}
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