FlightGear: JSBSim::FGAtmosphere Class Reference

#include <FGAtmosphere.h>

Inherited by JSBSim::FGStandardAtmosphere.

Classes
struct	Inputs

Public Types
enum	eTemperature { eNoTempUnit =0 , eFahrenheit , eCelsius , eRankine , eKelvin }
	Enums for specifying temperature units. More...

enum	ePressure { eNoPressUnit =0 , ePSF , eMillibars , ePascals , eInchesHg }
	Enums for specifying pressure units. More...

Public Types inherited from JSBSim::FGJSBBase
enum	{ eL = 1 , eM , eN }
	Moments L, M, N. More...

enum	{ eP = 1 , eQ , eR }
	Rates P, Q, R. More...

enum	{ eU = 1 , eV , eW }
	Velocities U, V, W. More...

enum	{ eX = 1 , eY , eZ }
	Positions X, Y, Z. More...

enum	{ ePhi = 1 , eTht , ePsi }
	Euler angles Phi, Theta, Psi. More...

enum	{ eDrag = 1 , eSide , eLift }
	Stability axis forces, Drag, Side force, Lift. More...

enum	{ eRoll = 1 , ePitch , eYaw }
	Local frame orientation Roll, Pitch, Yaw. More...

enum	{ eNorth = 1 , eEast , eDown }
	Local frame position North, East, Down. More...

enum	{ eLat = 1 , eLong , eRad }
	Locations Radius, Latitude, Longitude. More...

enum	{ inNone = 0 , inDegrees , inRadians , inMeters , inFeet }
	Conversion specifiers. More...

Public Member Functions
	FGAtmosphere (FGFDMExec *)
	Constructor.

virtual	~FGAtmosphere ()
	Destructor.

bool	Run (bool Holding) override
	Runs the atmosphere forces model; called by the Executive.

bool	InitModel (void) override

Temperature access functions.
There are several ways to get the temperature, and several modeled temperature values that can be retrieved.
virtual double	GetTemperature () const
	Returns the actual, modeled temperature at the current altitude in degrees Rankine.

virtual double	GetTemperature (double altitude) const =0
	Returns the actual modeled temperature in degrees Rankine at a specified altitude.

virtual double	GetTemperatureSL () const
	Returns the actual, modeled sea level temperature in degrees Rankine.

virtual double	GetTemperatureRatio () const
	Returns the ratio of the at-current-altitude temperature as modeled over the sea level value.

virtual double	GetTemperatureRatio (double h) const
	Returns the ratio of the temperature as modeled at the supplied altitude over the sea level value.

virtual void	SetTemperatureSL (double t, eTemperature unit=eFahrenheit)
	Sets the Sea Level temperature.

virtual void	SetTemperature (double t, double h, eTemperature unit=eFahrenheit)=0
	Sets the temperature at the supplied altitude.

Pressure access functions.
virtual double	GetPressure (void) const
	Returns the pressure in psf.

virtual double	GetPressure (double altitude) const =0
	Returns the pressure at a specified altitude in psf.

virtual double	GetPressureSL (ePressure to=ePSF) const

virtual double	GetPressureRatio (void) const
	Returns the ratio of at-altitude pressure over the sea level value.

virtual void	SetPressureSL (ePressure unit, double pressure)
	Sets the sea level pressure for modeling.

Density access functions.
virtual double	GetDensity (void) const
	Returns the density in slugs/ft^3.

virtual double	GetDensity (double altitude) const
	Returns the density in slugs/ft^3 at a given altitude in ft.

virtual double	GetDensitySL (void) const
	Returns the sea level density in slugs/ft^3.

virtual double	GetDensityRatio (void) const
	Returns the ratio of at-altitude density over the sea level value.

Speed of sound access functions.
virtual double	GetSoundSpeed (void) const
	Returns the speed of sound in ft/sec.

virtual double	GetSoundSpeed (double altitude) const
	Returns the speed of sound in ft/sec at a given altitude in ft.

virtual double	GetSoundSpeedSL (void) const
	Returns the sea level speed of sound in ft/sec.

virtual double	GetSoundSpeedRatio (void) const
	Returns the ratio of at-altitude sound speed over the sea level value.

Public Member Functions inherited from JSBSim::FGModel
	FGModel (FGFDMExec *)
	Constructor.

	~FGModel () override
	Destructor.

bool	InitModel (void) override

void	SetRate (unsigned int tt)
	Set the ouput rate for the model in frames.

unsigned int	GetRate (void)
	Get the output rate for the model in frames.

FGFDMExec *	GetExec (void)

void	SetPropertyManager (FGPropertyManager *fgpm)

virtual SGPath	FindFullPathName (const SGPath &path) const

const std::string &	GetName (void)

virtual bool	Load (Element *el)

Public Member Functions inherited from JSBSim::FGModelFunctions
virtual	~FGModelFunctions ()

void	RunPreFunctions (void)

void	RunPostFunctions (void)

bool	Load (Element el, FGFDMExec fdmex, std::string prefix="")

void	PreLoad (Element el, FGFDMExec fdmex, std::string prefix="")

void	PostLoad (Element el, FGFDMExec fdmex, std::string prefix="")

std::string	GetFunctionStrings (const std::string &delimeter) const
	Gets the strings for the current set of functions.

std::string	GetFunctionValues (const std::string &delimeter) const
	Gets the function values.

FGFunction *	GetPreFunction (const std::string &name)
	Get one of the "pre" function.

Public Member Functions inherited from JSBSim::FGJSBBase
	FGJSBBase ()
	Constructor for FGJSBBase.

virtual	~FGJSBBase ()
	Destructor for FGJSBBase.

void	PutMessage (const Message &msg)
	Places a Message structure on the Message queue.

void	PutMessage (const std::string &text)
	Creates a message with the given text and places it on the queue.

void	PutMessage (const std::string &text, bool bVal)
	Creates a message with the given text and boolean value and places it on the queue.

void	PutMessage (const std::string &text, int iVal)
	Creates a message with the given text and integer value and places it on the queue.

void	PutMessage (const std::string &text, double dVal)
	Creates a message with the given text and double value and places it on the queue.

int	SomeMessages (void) const
	Reads the message on the queue (but does not delete it).

void	ProcessMessage (void)
	Reads the message on the queue and removes it from the queue.

Message *	ProcessNextMessage (void)
	Reads the next message on the queue and removes it from the queue.

void	disableHighLighting (void)
	Disables highlighting in the console output.

Viscosity access functions.
struct JSBSim::FGAtmosphere::Inputs	in

static constexpr double	StdDaySLtemperature = 518.67

static constexpr double	StdDaySLpressure = 2116.228

static const double	StdDaySLsoundspeed = sqrt(SHRatioRengStdDaySLtemperature)

double	SLtemperature

double	SLdensity

double	SLpressure

double	SLsoundspeed

double	Temperature

double	Density

double	Pressure

double	Soundspeed

double	PressureAltitude

double	DensityAltitude

double	Viscosity

double	KinematicViscosity

static constexpr double	SutherlandConstant = 198.72

static constexpr double	Beta = 2.269690E-08

virtual double	GetAbsoluteViscosity (void) const
	Returns the absolute viscosity.

virtual double	GetKinematicViscosity (void) const
	Returns the kinematic viscosity.

virtual double	GetDensityAltitude () const

virtual double	GetPressureAltitude () const

virtual void	Calculate (double altitude)
	Calculate the atmosphere for the given altitude.

virtual double	CalculateDensityAltitude (double density, double geometricAlt)
	Calculates the density altitude given any temperature or pressure bias.

virtual double	CalculatePressureAltitude (double pressure, double geometricAlt)
	Calculates the pressure altitude given any temperature or pressure bias.

double	ConvertToRankine (double t, eTemperature unit) const
	Converts to Rankine from one of several unit systems.

double	ConvertFromRankine (double t, eTemperature unit) const
	Converts from Rankine to one of several unit systems.

double	ConvertToPSF (double t, ePressure unit=ePSF) const
	Converts to PSF (pounds per square foot) from one of several unit systems.

double	ConvertFromPSF (double t, ePressure unit=ePSF) const
	Converts from PSF (pounds per square foot) to one of several unit systems.

ISA constants
static constexpr double	Rstar = 8.31432 * kgtoslug / KelvinToRankine(fttom * fttom)
	Universal gas constant - ft*lbf/R/mol.

static constexpr double	Mair = 28.9645 * kgtoslug / 1000.0
	Mean molecular weight for air - slug/mol.

static constexpr double	g0 = 9.80665 / fttom
	Sea-level acceleration of gravity - ft/s^2.

static double	Reng = Rstar / Mair
	Specific gas constant for air - ft*lbf/slug/R.

static constexpr double	SHRatio = 1.4

virtual void	bind (void)

void	Debug (int from) override

Additional Inherited Members
static const std::string &	GetVersion (void)
	Returns the version number of JSBSim.

static constexpr double	KelvinToFahrenheit (double kelvin)
	Converts from degrees Kelvin to degrees Fahrenheit.

static constexpr double	CelsiusToRankine (double celsius)
	Converts from degrees Celsius to degrees Rankine.

static constexpr double	RankineToCelsius (double rankine)
	Converts from degrees Rankine to degrees Celsius.

static constexpr double	KelvinToRankine (double kelvin)
	Converts from degrees Kelvin to degrees Rankine.

static constexpr double	RankineToKelvin (double rankine)
	Converts from degrees Rankine to degrees Kelvin.

static constexpr double	FahrenheitToCelsius (double fahrenheit)
	Converts from degrees Fahrenheit to degrees Celsius.

static constexpr double	CelsiusToFahrenheit (double celsius)
	Converts from degrees Celsius to degrees Fahrenheit.

static constexpr double	CelsiusToKelvin (double celsius)
	Converts from degrees Celsius to degrees Kelvin.

static constexpr double	KelvinToCelsius (double kelvin)
	Converts from degrees Kelvin to degrees Celsius.

static constexpr double	FeetToMeters (double measure)
	Converts from feet to meters.

static double	PitotTotalPressure (double mach, double p)
	Compute the total pressure in front of the Pitot tube.

static double	MachFromImpactPressure (double qc, double p)
	Compute the Mach number from the differential pressure (qc) and the static pressure.

static double	VcalibratedFromMach (double mach, double p)
	Calculate the calibrated airspeed from the Mach number.

static double	MachFromVcalibrated (double vcas, double p)
	Calculate the Mach number from the calibrated airspeed.Based on the formulas in the US Air Force Aircraft Performance Flight Testing Manual (AFFTC-TIH-99-01).

static bool	EqualToRoundoff (double a, double b)
	Finite precision comparison.

static bool	EqualToRoundoff (float a, float b)
	Finite precision comparison.

static bool	EqualToRoundoff (float a, double b)
	Finite precision comparison.

static bool	EqualToRoundoff (double a, float b)
	Finite precision comparison.

static constexpr double	Constrain (double min, double value, double max)
	Constrain a value between a minimum and a maximum value.

static constexpr double	sign (double num)

static double	GaussianRandomNumber (void)

Static Public Attributes inherited from JSBSim::FGJSBBase
static char	highint [5] = {27, '[', '1', 'm', '\0' }
	highlights text

static char	halfint [5] = {27, '[', '2', 'm', '\0' }
	low intensity text

static char	normint [6] = {27, '[', '2', '2', 'm', '\0' }
	normal intensity text

static char	reset [5] = {27, '[', '0', 'm', '\0' }
	resets text properties

static char	underon [5] = {27, '[', '4', 'm', '\0' }
	underlines text

static char	underoff [6] = {27, '[', '2', '4', 'm', '\0' }
	underline off

static char	fgblue [6] = {27, '[', '3', '4', 'm', '\0' }
	blue text

static char	fgcyan [6] = {27, '[', '3', '6', 'm', '\0' }
	cyan text

static char	fgred [6] = {27, '[', '3', '1', 'm', '\0' }
	red text

static char	fggreen [6] = {27, '[', '3', '2', 'm', '\0' }
	green text

static char	fgdef [6] = {27, '[', '3', '9', 'm', '\0' }
	default text

static short	debug_lvl = 1

Protected Member Functions inherited from JSBSim::FGModel
bool	Upload (Element *el, bool preLoad)
	Uploads this model in memory.

static std::string	CreateIndexedPropertyName (const std::string &Property, int index)

Protected Attributes inherited from JSBSim::FGModel
unsigned int	exe_ctr

unsigned int	rate

std::string	Name

FGFDMExec *	FDMExec

FGPropertyManager *	PropertyManager

Protected Attributes inherited from JSBSim::FGModelFunctions
std::vector< FGFunction * >	PreFunctions

std::vector< FGFunction * >	PostFunctions

FGPropertyReader	LocalProperties

static Message	localMsg

static std::queue< Message >	Messages

static unsigned int	messageId = 0

static constexpr double	radtodeg = 180. / 3.14159265358979323846

static constexpr double	degtorad = 3.14159265358979323846 / 180.

static constexpr double	hptoftlbssec = 550.0

static constexpr double	psftoinhg = 0.014138

static constexpr double	psftopa = 47.88

static constexpr double	ktstofps = 1.68781

static constexpr double	fpstokts = 1.0 / ktstofps

static constexpr double	inchtoft = 1.0/12.0

static constexpr double	fttom = 0.3048

static constexpr double	m3toft3 = 1.0/(fttomfttomfttom)

static constexpr double	in3tom3 = inchtoftinchtoftinchtoft/m3toft3

static constexpr double	inhgtopa = 3386.38

static constexpr double	slugtolb = 32.174049
	Note that definition of lbtoslug by the inverse of slugtolb and not to a different constant you can also get from some tables will make lbtoslug*slugtolb == 1 up to the magnitude of roundoff.

static constexpr double	lbtoslug = 1.0/slugtolb

static constexpr double	kgtolb = 2.20462

static constexpr double	kgtoslug = 0.06852168

static const std::string	needed_cfg_version = "2.0"

static const std::string	JSBSim_version = JSBSIM_VERSION " " __DATE__ " " __TIME__

static int	gaussian_random_number_phase = 0

Detailed Description

Definition at line 76 of file FGAtmosphere.h.

Member Enumeration Documentation

◆ ePressure

enum JSBSim::FGAtmosphere::ePressure

Enums for specifying pressure units.

Enumerator
eNoPressUnit
ePSF
eMillibars
ePascals
eInchesHg

Definition at line 83 of file FGAtmosphere.h.

◆ eTemperature

enum JSBSim::FGAtmosphere::eTemperature

Enums for specifying temperature units.

Enumerator
eNoTempUnit
eFahrenheit
eCelsius
eRankine
eKelvin

Definition at line 80 of file FGAtmosphere.h.

Constructor & Destructor Documentation

◆ FGAtmosphere()

JSBSim::FGAtmosphere::FGAtmosphere ( FGFDMExec * fdmex )

Constructor.

Definition at line 60 of file FGAtmosphere.cpp.

◆ ~FGAtmosphere()

JSBSim::FGAtmosphere::~FGAtmosphere ( )

virtual

Destructor.

Definition at line 72 of file FGAtmosphere.cpp.

Member Function Documentation

◆ bind()

void JSBSim::FGAtmosphere::bind ( void )

protectedvirtual

Reimplemented in JSBSim::FGStandardAtmosphere.

Definition at line 271 of file FGAtmosphere.cpp.

◆ Calculate()

void JSBSim::FGAtmosphere::Calculate ( double altitude )

protectedvirtual

Calculate the atmosphere for the given altitude.

Reimplemented in JSBSim::FGStandardAtmosphere.

Definition at line 107 of file FGAtmosphere.cpp.

◆ CalculateDensityAltitude()

virtual double JSBSim::FGAtmosphere::CalculateDensityAltitude	(	double	density,
		double	geometricAlt )

inlineprotectedvirtual

Calculates the density altitude given any temperature or pressure bias.

Calculated density for the specified geometric altitude given any temperature or pressure biases is passed in.

Parameters

density
geometricAlt

Reimplemented in JSBSim::FGStandardAtmosphere.

Definition at line 236 of file FGAtmosphere.h.

◆ CalculatePressureAltitude()

virtual double JSBSim::FGAtmosphere::CalculatePressureAltitude	(	double	pressure,
		double	geometricAlt )

inlineprotectedvirtual

Calculates the pressure altitude given any temperature or pressure bias.

Calculated pressure for the specified geometric altitude given any temperature or pressure biases is passed in.

Parameters

pressure
geometricAlt

Reimplemented in JSBSim::FGStandardAtmosphere.

Definition at line 243 of file FGAtmosphere.h.

◆ ConvertFromPSF()

double JSBSim::FGAtmosphere::ConvertFromPSF	(	double	t,
		ePressure	unit = ePSF ) const

protected

Converts from PSF (pounds per square foot) to one of several unit systems.

Definition at line 245 of file FGAtmosphere.cpp.

◆ ConvertFromRankine()

double JSBSim::FGAtmosphere::ConvertFromRankine	(	double	t,
		eTemperature	unit ) const

protected

Converts from Rankine to one of several unit systems.

Definition at line 195 of file FGAtmosphere.cpp.

◆ ConvertToPSF()

double JSBSim::FGAtmosphere::ConvertToPSF	(	double	t,
		ePressure	unit = ePSF ) const

protected

Converts to PSF (pounds per square foot) from one of several unit systems.

Definition at line 221 of file FGAtmosphere.cpp.

◆ ConvertToRankine()

double JSBSim::FGAtmosphere::ConvertToRankine	(	double	t,
		eTemperature	unit ) const

protected

Converts to Rankine from one of several unit systems.

Definition at line 169 of file FGAtmosphere.cpp.

◆ Debug()

void JSBSim::FGAtmosphere::Debug ( int from )

overrideprotectedvirtual

Reimplemented from JSBSim::FGModel.

Reimplemented in JSBSim::FGStandardAtmosphere.

Definition at line 307 of file FGAtmosphere.cpp.

◆ GetAbsoluteViscosity()

virtual double JSBSim::FGAtmosphere::GetAbsoluteViscosity ( void ) const

inlinevirtual

Returns the absolute viscosity.

Definition at line 199 of file FGAtmosphere.h.

◆ GetDensity() [1/2]

double JSBSim::FGAtmosphere::GetDensity ( double altitude ) const

virtual

Returns the density in slugs/ft^3 at a given altitude in ft.

Definition at line 145 of file FGAtmosphere.cpp.

◆ GetDensity() [2/2]

virtual double JSBSim::FGAtmosphere::GetDensity ( void ) const

inlinevirtual

Returns the density in slugs/ft^3.

This function may only be used if Run() is called first.

Definition at line 167 of file FGAtmosphere.h.

◆ GetDensityAltitude()

virtual double JSBSim::FGAtmosphere::GetDensityAltitude ( ) const

inlinevirtual

Definition at line 205 of file FGAtmosphere.h.

◆ GetDensityRatio()

virtual double JSBSim::FGAtmosphere::GetDensityRatio ( void ) const

inlinevirtual

Returns the ratio of at-altitude density over the sea level value.

Definition at line 176 of file FGAtmosphere.h.

◆ GetDensitySL()

virtual double JSBSim::FGAtmosphere::GetDensitySL ( void ) const

inlinevirtual

Returns the sea level density in slugs/ft^3.

Definition at line 173 of file FGAtmosphere.h.

◆ GetKinematicViscosity()

virtual double JSBSim::FGAtmosphere::GetKinematicViscosity ( void ) const

inlinevirtual

Returns the kinematic viscosity.

Definition at line 202 of file FGAtmosphere.h.

◆ GetPressure() [1/2]

virtual double JSBSim::FGAtmosphere::GetPressure ( double altitude ) const

pure virtual

Returns the pressure at a specified altitude in psf.

Implemented in JSBSim::FGStandardAtmosphere.

◆ GetPressure() [2/2]

virtual double JSBSim::FGAtmosphere::GetPressure ( void ) const

inlinevirtual

Returns the pressure in psf.

Definition at line 144 of file FGAtmosphere.h.

◆ GetPressureAltitude()

virtual double JSBSim::FGAtmosphere::GetPressureAltitude ( ) const

inlinevirtual

Definition at line 207 of file FGAtmosphere.h.

◆ GetPressureRatio()

virtual double JSBSim::FGAtmosphere::GetPressureRatio ( void ) const

inlinevirtual

Returns the ratio of at-altitude pressure over the sea level value.

Definition at line 153 of file FGAtmosphere.h.

◆ GetPressureSL()

virtual double JSBSim::FGAtmosphere::GetPressureSL ( ePressure to = ePSF ) const

inlinevirtual

Definition at line 150 of file FGAtmosphere.h.

◆ GetSoundSpeed() [1/2]

double JSBSim::FGAtmosphere::GetSoundSpeed ( double altitude ) const

virtual

Returns the speed of sound in ft/sec at a given altitude in ft.

Definition at line 152 of file FGAtmosphere.cpp.

◆ GetSoundSpeed() [2/2]

virtual double JSBSim::FGAtmosphere::GetSoundSpeed ( void ) const

inlinevirtual

Returns the speed of sound in ft/sec.

Definition at line 183 of file FGAtmosphere.h.

◆ GetSoundSpeedRatio()

virtual double JSBSim::FGAtmosphere::GetSoundSpeedRatio ( void ) const

inlinevirtual

Returns the ratio of at-altitude sound speed over the sea level value.

Definition at line 192 of file FGAtmosphere.h.

◆ GetSoundSpeedSL()

virtual double JSBSim::FGAtmosphere::GetSoundSpeedSL ( void ) const

inlinevirtual

Returns the sea level speed of sound in ft/sec.

Definition at line 189 of file FGAtmosphere.h.

◆ GetTemperature() [1/2]

virtual double JSBSim::FGAtmosphere::GetTemperature ( ) const

inlinevirtual

Returns the actual, modeled temperature at the current altitude in degrees Rankine.

Returns: Modeled temperature in degrees Rankine.

Definition at line 109 of file FGAtmosphere.h.

◆ GetTemperature() [2/2]

virtual double JSBSim::FGAtmosphere::GetTemperature ( double altitude ) const

pure virtual

Returns the actual modeled temperature in degrees Rankine at a specified altitude.

Parameters

altitude The altitude above sea level (ASL) in feet.

Returns: Modeled temperature in degrees Rankine at the specified altitude.

Implemented in JSBSim::FGStandardAtmosphere.

◆ GetTemperatureRatio() [1/2]

virtual double JSBSim::FGAtmosphere::GetTemperatureRatio ( ) const

inlinevirtual

Returns the ratio of the at-current-altitude temperature as modeled over the sea level value.

Definition at line 122 of file FGAtmosphere.h.

◆ GetTemperatureRatio() [2/2]

virtual double JSBSim::FGAtmosphere::GetTemperatureRatio ( double h ) const

inlinevirtual

Returns the ratio of the temperature as modeled at the supplied altitude over the sea level value.

Definition at line 126 of file FGAtmosphere.h.

◆ GetTemperatureSL()

virtual double JSBSim::FGAtmosphere::GetTemperatureSL ( ) const

inlinevirtual

Returns the actual, modeled sea level temperature in degrees Rankine.

Returns: The modeled temperature in degrees Rankine at sea level.

Definition at line 118 of file FGAtmosphere.h.

◆ InitModel()

bool JSBSim::FGAtmosphere::InitModel ( void )

overridevirtual

Reimplemented from JSBSim::FGModelFunctions.

Reimplemented in JSBSim::FGStandardAtmosphere.

Definition at line 79 of file FGAtmosphere.cpp.

◆ Run()

bool JSBSim::FGAtmosphere::Run ( bool Holding )

overridevirtual

Runs the atmosphere forces model; called by the Executive.

Can pass in a value indicating if the executive is directing the simulation to Hold.

Parameters

Holding if true, the executive has been directed to hold the sim from advancing time. Some models may ignore this flag, such as the Input model, which may need to be active to listen on a socket for the "Resume" command to be given.

Returns: false if no error

Reimplemented from JSBSim::FGModel.

Definition at line 94 of file FGAtmosphere.cpp.

◆ SetPressureSL()

void JSBSim::FGAtmosphere::SetPressureSL	(	ePressure	unit,
		double	pressure )

virtual

Sets the sea level pressure for modeling.

Parameters

pressure	The pressure in the units specified.
unit	the unit of measure that the specified pressure is supplied in.

Reimplemented in JSBSim::FGStandardAtmosphere.

Definition at line 135 of file FGAtmosphere.cpp.

◆ SetTemperature()

virtual void JSBSim::FGAtmosphere::SetTemperature	(	double	t,
		double	h,
		eTemperature	unit = eFahrenheit )

pure virtual

Sets the temperature at the supplied altitude.

Parameters

t	The temperature value in the unit provided.
h	The altitude in feet above sea level.
unit	The unit of the temperature.

Implemented in JSBSim::FGStandardAtmosphere.

◆ SetTemperatureSL()

void JSBSim::FGAtmosphere::SetTemperatureSL	(	double	t,
		eTemperature	unit = eFahrenheit )

virtual

Sets the Sea Level temperature.

Parameters

t	the temperature value in the unit provided.
unit	the unit of the temperature.

Reimplemented in JSBSim::FGStandardAtmosphere.

Definition at line 162 of file FGAtmosphere.cpp.

Member Data Documentation

◆ Beta

double JSBSim::FGAtmosphere::Beta = 2.269690E-08

staticconstexprprotected

Definition at line 225 of file FGAtmosphere.h.

◆ Density

double JSBSim::FGAtmosphere::Density

protected

Definition at line 219 of file FGAtmosphere.h.

◆ DensityAltitude

double JSBSim::FGAtmosphere::DensityAltitude

protected

Definition at line 222 of file FGAtmosphere.h.

◆ g0

double JSBSim::FGAtmosphere::g0 = 9.80665 / fttom

staticconstexprprotected

Sea-level acceleration of gravity - ft/s^2.

This constant is defined to compute the International Standard Atmosphere. It is by definition the sea level gravity at a latitude of 45deg. This value is fixed whichever gravity model is used by FGInertial.

Definition at line 268 of file FGAtmosphere.h.

◆ in

struct JSBSim::FGAtmosphere::Inputs JSBSim::FGAtmosphere::in

◆ KinematicViscosity

double JSBSim::FGAtmosphere::KinematicViscosity

protected

Definition at line 226 of file FGAtmosphere.h.

◆ Mair

double JSBSim::FGAtmosphere::Mair = 28.9645 * kgtoslug / 1000.0

staticconstexprprotected

Mean molecular weight for air - slug/mol.

Definition at line 262 of file FGAtmosphere.h.

◆ Pressure

double JSBSim::FGAtmosphere::Pressure

protected

Definition at line 219 of file FGAtmosphere.h.

◆ PressureAltitude

double JSBSim::FGAtmosphere::PressureAltitude

protected

Definition at line 221 of file FGAtmosphere.h.

◆ Reng

double JSBSim::FGAtmosphere::Reng = Rstar / Mair

staticprotected

Specific gas constant for air - ft*lbf/slug/R.

Definition at line 270 of file FGAtmosphere.h.

◆ Rstar

double JSBSim::FGAtmosphere::Rstar = 8.31432 * kgtoslug / KelvinToRankine(fttom * fttom)

staticconstexprprotected

Universal gas constant - ft*lbf/R/mol.

Definition at line 260 of file FGAtmosphere.h.

◆ SHRatio

double JSBSim::FGAtmosphere::SHRatio = 1.4

staticconstexprprotected

Definition at line 273 of file FGAtmosphere.h.

◆ SLdensity

double JSBSim::FGAtmosphere::SLdensity

protected

Definition at line 218 of file FGAtmosphere.h.

◆ SLpressure

double JSBSim::FGAtmosphere::SLpressure

protected

Definition at line 218 of file FGAtmosphere.h.

◆ SLsoundspeed

double JSBSim::FGAtmosphere::SLsoundspeed

protected

Definition at line 218 of file FGAtmosphere.h.

◆ SLtemperature

double JSBSim::FGAtmosphere::SLtemperature

protected

Definition at line 218 of file FGAtmosphere.h.

◆ Soundspeed

double JSBSim::FGAtmosphere::Soundspeed

protected

Definition at line 219 of file FGAtmosphere.h.

◆ StdDaySLpressure

double JSBSim::FGAtmosphere::StdDaySLpressure = 2116.228

staticconstexpr

Definition at line 214 of file FGAtmosphere.h.

◆ StdDaySLsoundspeed

const double JSBSim::FGAtmosphere::StdDaySLsoundspeed = sqrt(SHRatio*Reng*StdDaySLtemperature)

static

Definition at line 215 of file FGAtmosphere.h.

◆ StdDaySLtemperature

double JSBSim::FGAtmosphere::StdDaySLtemperature = 518.67

staticconstexpr

Definition at line 213 of file FGAtmosphere.h.

◆ SutherlandConstant

double JSBSim::FGAtmosphere::SutherlandConstant = 198.72

staticconstexprprotected

Definition at line 224 of file FGAtmosphere.h.

◆ Temperature

double JSBSim::FGAtmosphere::Temperature

protected

Definition at line 219 of file FGAtmosphere.h.

◆ Viscosity

double JSBSim::FGAtmosphere::Viscosity

protected

Definition at line 226 of file FGAtmosphere.h.

The documentation for this class was generated from the following files:

Classes

Public Types

Public Member Functions

Viscosity access functions.

ISA constants

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ ePressure

◆ eTemperature

Constructor & Destructor Documentation

◆ FGAtmosphere()

◆ ~FGAtmosphere()

Member Function Documentation

◆ bind()

◆ Calculate()

◆ CalculateDensityAltitude()

◆ CalculatePressureAltitude()

◆ ConvertFromPSF()

◆ ConvertFromRankine()

◆ ConvertToPSF()

◆ ConvertToRankine()

◆ Debug()

◆ GetAbsoluteViscosity()

◆ GetDensity() [1/2]

◆ GetDensity() [2/2]

◆ GetDensityAltitude()

◆ GetDensityRatio()

◆ GetDensitySL()

◆ GetKinematicViscosity()

◆ GetPressure() [1/2]

◆ GetPressure() [2/2]

◆ GetPressureAltitude()

◆ GetPressureRatio()

◆ GetPressureSL()

◆ GetSoundSpeed() [1/2]

◆ GetSoundSpeed() [2/2]

◆ GetSoundSpeedRatio()

◆ GetSoundSpeedSL()

◆ GetTemperature() [1/2]

◆ GetTemperature() [2/2]

◆ GetTemperatureRatio() [1/2]

◆ GetTemperatureRatio() [2/2]

◆ GetTemperatureSL()

◆ InitModel()

◆ Run()

◆ SetPressureSL()

◆ SetTemperature()

◆ SetTemperatureSL()

Member Data Documentation

◆ Beta

◆ Density

◆ DensityAltitude

◆ g0

◆ in

◆ KinematicViscosity

◆ Mair

◆ Pressure

◆ PressureAltitude

◆ Reng

◆ Rstar

◆ SHRatio

◆ SLdensity

◆ SLpressure

◆ SLsoundspeed

◆ SLtemperature

◆ Soundspeed

◆ StdDaySLpressure

◆ StdDaySLsoundspeed

◆ StdDaySLtemperature

◆ SutherlandConstant

◆ Temperature

◆ Viscosity