Detailed Description

Models a rocket nozzle.

Configuration File Format:

<nozzle name="{string}">
  <pe unit="{PSF}"> {number}  </pe>
  <area unit="{FT2 | M2 | IN2}"> {number}  </area>
</nozzle>

Configuration parameters are:

    pe -      Nozzle design exit pressure.
    area -    Nozzle area at the exit plane.

All parameters MUST be specified.

Author: Jon S. Berndt

Definition at line 78 of file FGNozzle.h.

#include <FGNozzle.h>

Inheritance diagram for FGNozzle:

Collaboration diagram for FGNozzle:

Public Member Functions
	FGNozzle (FGFDMExec exec, Element el, int num=0)
	Constructor.

	~FGNozzle ()
	Destructor.

double	Calculate (double vacThrust)

std::string	GetThrusterLabels (int id, const std::string &delimeter)

std::string	GetThrusterValues (int id, const std::string &delimeter)

Public Member Functions inherited from FGThruster
	FGThruster (FGFDMExec FDMExec, Element el, int num)
	Constructor.

virtual	~FGThruster ()
	Destructor.

virtual double	GetEngineRPM (void) const

double	GetGearRatio (void)

std::string	GetName (void)

virtual double	GetPowerRequired (void)

double	GetReverserAngle (void) const

virtual double	GetRPM (void) const

double	GetThrust (void) const

eType	GetType (void)

virtual void	ResetToIC (void)

virtual void	SetEngineRPM (double rpm)

void	SetName (std::string name)

void	SetReverserAngle (double angle)

virtual void	SetRPM (double rpm)

Public Member Functions inherited from FGForce
	FGForce (FGFDMExec *FDMExec)
	Constructor.

virtual	~FGForce ()
	Destructor.

const FGColumnVector3 &	GetActingLocation (void) const

double	GetActingLocationX (void) const

double	GetActingLocationY (void) const

double	GetActingLocationZ (void) const

double	GetAnglesToBody (int axis) const

const FGColumnVector3 &	GetAnglesToBody (void) const

virtual const FGColumnVector3 &	GetBodyForces (void)

double	GetBodyXForce (void) const

double	GetBodyYForce (void) const

double	GetBodyZForce (void) const

const FGColumnVector3 &	GetLocation (void) const

double	GetLocationX (void) const

double	GetLocationY (void) const

double	GetLocationZ (void) const

const FGColumnVector3 &	GetMoments (void) const

double	GetPitch (void) const

TransformType	GetTransformType (void) const

double	GetYaw (void) const

void	SetActingLocation (const FGColumnVector3 &vv)

void	SetActingLocation (double x, double y, double z)
	Acting point of application.

void	SetActingLocationX (double x)

void	SetActingLocationY (double y)

void	SetActingLocationZ (double z)

void	SetAnglesToBody (const FGColumnVector3 &vv)

void	SetAnglesToBody (double broll, double bpitch, double byaw)

void	SetLocation (const FGColumnVector3 &vv)

void	SetLocation (double x, double y, double z)

void	SetLocationX (double x)

void	SetLocationY (double y)

void	SetLocationZ (double z)

void	SetPitch (double pitch)

void	SetTransformType (TransformType ii)

void	SetYaw (double yaw)

const FGMatrix33 &	Transform (void) const

void	UpdateCustomTransformMatrix (void)

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

virtual	~FGJSBBase ()
	Destructor for FGJSBBase.

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

Additional Inherited Members
Public Types inherited from FGThruster
enum	eType { ttNozzle , ttRotor , ttPropeller , ttDirect }

Public Types inherited from FGForce
enum	TransformType { tNone , tWindBody , tLocalBody , tInertialBody , tCustom }

Public Types inherited from 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...

Static Public Member Functions inherited from FGJSBBase
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 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)

Public Attributes inherited from FGThruster
struct JSBSim::FGThruster::Inputs	in

Static Public Attributes inherited from 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

Static Protected Member Functions inherited from FGJSBBase
static std::string	CreateIndexedPropertyName (const std::string &Property, int index)

Protected Attributes inherited from FGThruster
int	EngineNum

double	GearRatio

std::string	Name

double	PowerRequired

double	ReverserAngle

double	Thrust

double	ThrustCoeff

eType	Type

Protected Attributes inherited from FGForce
FGFDMExec *	fdmex

std::shared_ptr< FGMassBalance >	MassBalance

FGMatrix33	mT

TransformType	ttype

FGColumnVector3	vActingXYZn

FGColumnVector3	vFn

FGColumnVector3	vMn

FGColumnVector3	vOrient

FGColumnVector3	vXYZn

Static Protected Attributes inherited from FGJSBBase
static constexpr double	radtodeg = 180. / M_PI

static constexpr double	degtorad = M_PI / 180.

static constexpr double	hptoftlbssec = 550.0

static constexpr double	psftoinhg = 0.014138

static constexpr double	psftopa = 47.88

static constexpr double	fttom = 0.3048

static constexpr double	ktstofps = 1852./(3600*fttom)

static constexpr double	fpstokts = 1.0 / ktstofps

static constexpr double	inchtoft = 1.0/12.0

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__

Constructor & Destructor Documentation

◆ FGNozzle()

FGNozzle	(	FGFDMExec *	exec,
		Element *	el,
		int	num = `0`
	)

Constructor.

Definition at line 54 of file FGNozzle.cpp.

                    : FGThruster(FDMExec, nozzle_element, num)
{
  if (nozzle_element->FindElement("area"))
    Area = nozzle_element->FindElementValueAsNumberConvertTo("area", "FT2");
  else {
    const string s("Fatal Error: Nozzle exit area must be given in nozzle config file.");
    cerr << s << endl;
    throw BaseException(s);
  }
 
  Thrust = 0;
  Type = ttNozzle;
 
  Debug(0);
}

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◆ ~FGNozzle()

~FGNozzle ( )

Destructor.

Definition at line 73 of file FGNozzle.cpp.

{
  Debug(1);
}

Member Function Documentation

◆ Calculate()

double Calculate ( double vacThrust )

virtual

Reimplemented from FGThruster.

Definition at line 80 of file FGNozzle.cpp.

{
  Thrust = max((double)0.0, vacThrust - in.Pressure*Area);
 
  vFn(1) = Thrust * cos(ReverserAngle);
 
  return Thrust;
}

◆ GetThrusterLabels()

string GetThrusterLabels	(	int	id,
		const std::string &	delimeter
	)

virtual

Reimplemented from FGThruster.

Definition at line 91 of file FGNozzle.cpp.

{
  std::ostringstream buf;
 
  buf << Name << " Thrust (engine " << id << " in lbs)";
 
  return buf.str();
}

◆ GetThrusterValues()

string GetThrusterValues	(	int	id,
		const std::string &	delimeter
	)

virtual

Reimplemented from FGThruster.

Definition at line 102 of file FGNozzle.cpp.

{
  std::ostringstream buf;
 
  buf << Thrust;
 
  return buf.str();
}

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

Detailed Description

Configuration File Format:

Configuration parameters are:

Public Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

◆ FGNozzle()

◆ ~FGNozzle()

Member Function Documentation

◆ Calculate()

◆ GetThrusterLabels()

◆ GetThrusterValues()