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JSBSim Flight Dynamics Model
1.1.11 (13 Feb 2022)
An Open Source Flight Dynamics and Control Software Library in C++
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JSBSim Flight Dynamics Model
1.1.11 (13 Feb 2022)
An Open Source Flight Dynamics and Control Software Library in C++
|
Lookup table class.
Models a one, two, or three dimensional lookup table for use in aerodynamics and function definitions.
For a single "vector" lookup table, the format is as follows:
The lookup="row" attribute in the independentVar element is option in this case; it is assumed that the independentVar is a row variable.
A "real life" example is as shown here:
The first column in the data table represents the lookup index (or "key"). In this case, the lookup index is aero/alpha-rad (angle of attack in radians). If alpha is 0.26 radians, the value returned from the lookup table would be 0.033.
The definition for a 2D table, is as follows:
The data is in a gridded format.
A "real life" example is as shown below. Alpha in radians is the row lookup (alpha breakpoints are arranged in the first column) and flap position in degrees is
The definition for a 3D table in a coefficient would be (for example):
[Note the "breakpoint" attribute in the tableData element, above.]
Here's an example:
In addition to using a Table for something like a coefficient, where all the row and column elements are read in from a file, a Table could be created and populated completely within program code:
The first column in the table, above, is thi (the lookup index, or key). The second column is the output data - in this case, "neta" (the Greek letter referring to combustion efficiency). Later on, the table is used like this:
#include <FGTable.h>
Inheritance diagram for FGTable: Collaboration diagram for FGTable:Public Member Functions | |
| FGTable (const FGTable &table) | |
| This is the very important copy constructor. More... | |
| FGTable (FGPropertyManager *propMan, Element *el, const std::string &prefix="") | |
| The constructor for a table. | |
| FGTable (int) | |
| FGTable (int, int) | |
| ~FGTable () | |
| Destructor. | |
| double | GetElement (int r, int c) const |
| std::string | GetName (void) const |
| unsigned int | GetNumRows () const |
| double | GetValue (double key) const |
| double | GetValue (double rowKey, double colKey) const |
| double | GetValue (double rowKey, double colKey, double TableKey) const |
| double | GetValue (void) const |
| double | operator() (unsigned int r, unsigned int c) const |
| FGTable & | operator<< (const double n) |
| FGTable & | operator<< (const int n) |
| void | operator<< (std::istream &) |
| Read the table in. More... | |
| void | Print (void) |
| void | SetColumnIndexProperty (FGPropertyNode *node) |
| void | SetRowIndexProperty (FGPropertyNode *node) |
| Public Member Functions inherited from FGParameter | |
| double | getDoubleValue (void) const |
| virtual bool | IsConstant (void) const |
| Public Member Functions inherited from FGJSBBase | |
| FGJSBBase () | |
| Constructor for FGJSBBase. | |
| virtual | ~FGJSBBase () |
| Destructor for FGJSBBase. | |
| void | PutMessage (const Message &msg) |
| Places a Message structure on the Message queue. More... | |
| void | PutMessage (const std::string &text) |
| Creates a message with the given text and places it on the queue. More... | |
| void | PutMessage (const std::string &text, bool bVal) |
| Creates a message with the given text and boolean value and places it on the queue. More... | |
| void | PutMessage (const std::string &text, int iVal) |
| Creates a message with the given text and integer value and places it on the queue. More... | |
| void | PutMessage (const std::string &text, double dVal) |
| Creates a message with the given text and double value and places it on the queue. More... | |
| int | SomeMessages (void) const |
| Reads the message on the queue (but does not delete it). More... | |
| void | ProcessMessage (void) |
| Reads the message on the queue and removes it from the queue. More... | |
| Message * | ProcessNextMessage (void) |
| Reads the next message on the queue and removes it from the queue. More... | |
| void | disableHighLighting (void) |
| Disables highlighting in the console output. | |
Additional Inherited Members | |
| Public Types inherited from FGJSBBase | |
| enum | { eL = 1, eM, eN } |
| Moments L, M, N. | |
| enum | { eP = 1, eQ, eR } |
| Rates P, Q, R. | |
| enum | { eU = 1, eV, eW } |
| Velocities U, V, W. | |
| enum | { eX = 1, eY, eZ } |
| Positions X, Y, Z. | |
| enum | { ePhi = 1, eTht, ePsi } |
| Euler angles Phi, Theta, Psi. | |
| enum | { eDrag = 1, eSide, eLift } |
| Stability axis forces, Drag, Side force, Lift. | |
| enum | { eRoll = 1, ePitch, eYaw } |
| Local frame orientation Roll, Pitch, Yaw. | |
| enum | { eNorth = 1, eEast, eDown } |
| Local frame position North, East, Down. | |
| enum | { eLat = 1, eLong, eRad } |
| Locations Radius, Latitude, Longitude. | |
| enum | { inNone = 0, inDegrees, inRadians, inMeters, inFeet } |
| Conversion specifiers. | |
| Static Public Member Functions inherited from FGJSBBase | |
| static const std::string & | GetVersion (void) |
| Returns the version number of JSBSim. More... | |
| static constexpr double | KelvinToFahrenheit (double kelvin) |
| Converts from degrees Kelvin to degrees Fahrenheit. More... | |
| static constexpr double | CelsiusToRankine (double celsius) |
| Converts from degrees Celsius to degrees Rankine. More... | |
| static constexpr double | RankineToCelsius (double rankine) |
| Converts from degrees Rankine to degrees Celsius. More... | |
| static constexpr double | KelvinToRankine (double kelvin) |
| Converts from degrees Kelvin to degrees Rankine. More... | |
| static constexpr double | RankineToKelvin (double rankine) |
| Converts from degrees Rankine to degrees Kelvin. More... | |
| static constexpr double | FahrenheitToCelsius (double fahrenheit) |
| Converts from degrees Fahrenheit to degrees Celsius. More... | |
| static constexpr double | CelsiusToFahrenheit (double celsius) |
| Converts from degrees Celsius to degrees Fahrenheit. More... | |
| static constexpr double | CelsiusToKelvin (double celsius) |
| Converts from degrees Celsius to degrees Kelvin. More... | |
| static constexpr double | KelvinToCelsius (double kelvin) |
| Converts from degrees Kelvin to degrees Celsius. More... | |
| static constexpr double | FeetToMeters (double measure) |
| Converts from feet to meters. More... | |
| static double | PitotTotalPressure (double mach, double p) |
| Compute the total pressure in front of the Pitot tube. More... | |
| static double | MachFromImpactPressure (double qc, double p) |
| Compute the Mach number from the differential pressure (qc) and the static pressure. More... | |
| static double | VcalibratedFromMach (double mach, double p) |
| Calculate the calibrated airspeed from the Mach number. More... | |
| 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). More... | |
| static bool | EqualToRoundoff (double a, double b) |
| Finite precision comparison. More... | |
| static bool | EqualToRoundoff (float a, float b) |
| Finite precision comparison. More... | |
| static bool | EqualToRoundoff (float a, double b) |
| Finite precision comparison. More... | |
| static bool | EqualToRoundoff (double a, float b) |
| Finite precision comparison. More... | |
| 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 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) |
| Static Protected Attributes inherited from FGJSBBase | |
| static Message | localMsg |
| static std::queue< Message > | Messages |
| static unsigned int | messageId = 0 |
| 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 | 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/(fttom*fttom*fttom) |
| static constexpr double | in3tom3 = inchtoft*inchtoft*inchtoft/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. More... | |
| 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 |
This is the very important copy constructor.
| table | a const reference to a table. |
Definition at line 82 of file FGTable.cpp.
Here is the caller graph for this function:| void operator<< | ( | std::istream & | in_stream | ) |
Read the table in.
Data in the config file should be in matrix format with the row independents as the first column and the column independents in the first row. The implication of this layout is that there should be no value in the upper left corner of the matrix e.g:
0 10 20 30 ...
-5 1 2 3 4 ...
...
For multiple-table (i.e. 3D) data sets there is an additional number key in the table definition. For example:
0.0
0 10 20 30 ...
-5 1 2 3 4 ...
...
Definition at line 573 of file FGTable.cpp.
1.8.17