src/Systems/vacuum.cxx

   1 // vacuum.cxx - a vacuum pump connected to the aircraft engine.
   2 // Written by David Megginson, started 2002.
   3 //
   4 // This file is in the Public Domain and comes with no warranty.
   5
   6 #include "vacuum.hxx"
   7 #include <Main/fg_props.hxx>
   8
   9
  10 VacuumSystem::VacuumSystem ()
  11 {
  12 }
  13
  14 VacuumSystem::~VacuumSystem ()
  15 {
  16 }
  17
  18 void
  19 VacuumSystem::init ()
  20 {
  21                                 // TODO: allow index of pump and engine
  22                                 // to be configured.
  23     _serviceable_node = fgGetNode("/systems/vacuum[0]/serviceable", true);
  24     _rpm_node = fgGetNode("/engines/engine[0]/rpm", true);
  25     _pressure_node = fgGetNode("/environment/pressure-inhg", true);
  26     _suction_node = fgGetNode("/systems/vacuum[0]/suction-inhg", true);
  27 }
  28
  29 void
  30 VacuumSystem::bind ()
  31 {
  32 }
  33
  34 void
  35 VacuumSystem::unbind ()
  36 {
  37 }
  38
  39 void
  40 VacuumSystem::update (double dt)
  41 {
  42     // Model taken from steam.cxx
  43
  44     double suction;
  45
  46     if (!_serviceable_node->getBoolValue()) {
  47         suction = 0.0;
  48     } else {
  49         double rpm = _rpm_node->getDoubleValue();
  50         double pressure = _pressure_node->getDoubleValue();
  51         suction = pressure * rpm / (rpm + 10000.0);
  52         if (suction > 5.0)
  53             suction = 5.0;
  54     }
  55     _suction_node->setDoubleValue(suction);
  56 }
  57
  58 // end of vacuum.cxx