//
// This file is in the Public Domain and comes with no warranty.
-#include "pitot.hxx"
+#include <simgear/constants.h>
+
#include <Main/fg_props.hxx>
#include <Main/util.hxx>
+#include "pitot.hxx"
PitotSystem::PitotSystem ( SGPropertyNode *node )
:
- name("pitot"),
- num(0)
+ _name(node->getStringValue("name", "pitot")),
+ _num(node->getIntValue("number", 0))
{
- int i;
- for ( i = 0; i < node->nChildren(); ++i ) {
- SGPropertyNode *child = node->getChild(i);
- string cname = child->getName();
- string cval = child->getStringValue();
- if ( cname == "name" ) {
- name = cval;
- } else if ( cname == "number" ) {
- num = child->getIntValue();
- } else {
- SG_LOG( SG_SYSTEMS, SG_WARN, "Error in systems config logic" );
- if ( name.length() ) {
- SG_LOG( SG_SYSTEMS, SG_WARN, "Section = " << name );
- }
- }
- }
-}
-
-PitotSystem::PitotSystem ( int i )
-{
- num = i;
- name = "pitot";
}
PitotSystem::~PitotSystem ()
PitotSystem::init ()
{
string branch;
- branch = "/systems/" + name;
+ branch = "/systems/" + _name;
- SGPropertyNode *node = fgGetNode(branch.c_str(), num, true );
+ SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
_serviceable_node = node->getChild("serviceable", 0, true);
_pressure_node = fgGetNode("/environment/pressure-inhg", true);
_density_node = fgGetNode("/environment/density-slugft3", true);
_velocity_node = fgGetNode("/velocities/airspeed-kt", true);
+ _slip_angle = fgGetNode("/orientation/side-slip-rad", true);
_total_pressure_node = node->getChild("total-pressure-inhg", 0, true);
}
# define PSFTOINHG (1/INHGTOPSF)
#endif
-#ifndef KTTOFPS
-# define KTTOFPS 1.68781
-#endif
-
void
PitotSystem::update (double dt)
// velocity in the body axis.
double p = _pressure_node->getDoubleValue() * INHGTOPSF;
double r = _density_node->getDoubleValue();
- double v = _velocity_node->getDoubleValue() * KTTOFPS;
+ double v = _velocity_node->getDoubleValue() * SG_KT_TO_FPS;
+ v *= cos(_slip_angle->getDoubleValue());
+ if (v < 0.0)
+ v = 0.0;
double q = 0.5 * r * v * v; // dynamic
_total_pressure_node->setDoubleValue((p + q) * PSFTOINHG);
}