Ejemplo n.º 1
0
// Dynamics model interface
bool LaeroModel::setCommandedHeadingD(const double h, const double hDps, const double maxBank)
{
   //-------------------------------------------------------
   // get data pointers
   //-------------------------------------------------------
   Simulation::Player* pPlr = static_cast<Simulation::Player*>( findContainerByType(typeid(Simulation::Player)) );

   bool ok = (pPlr != nullptr);
   if (ok) {

      //----------------------------------------------------
      // define local constants
      //----------------------------------------------------
      const double MAX_BANK_RAD = maxBank * Basic::Angle::D2RCC;
      //const double TAU = 2.0;  // time constant [sec]
      const double TAU = 1.0;  // time constant [sec]

      //-------------------------------------------------------
      // get current data
      //-------------------------------------------------------
      double velMps        = pPlr->getTotalVelocity();
      double hdgDeg        = pPlr->getHeadingD();
      double hdgErrDeg     = Basic::Angle::aepcdDeg(h - hdgDeg);
      double hdgErrAbsDeg  = std::fabs(hdgErrDeg);

      //-------------------------------------------------------
      // get absolute heading rate of change (hdgDotAbsDps)
      //-------------------------------------------------------
      double hdgDotMaxAbsRps = Eaagles::ETHGM * std::tan(MAX_BANK_RAD) / velMps;
      double hdgDotMaxAbsDps = hdgDotMaxAbsRps * Basic::Angle::R2DCC;

      double hdgDotAbsDps = hDps;
      if (hdgDotAbsDps > hdgDotMaxAbsDps) {
         hdgDotAbsDps = hdgDotMaxAbsDps;
      }

      double hdgErrBrkAbsDeg = TAU * hdgDotAbsDps;
      if (hdgErrAbsDeg < hdgErrBrkAbsDeg) {
         hdgDotAbsDps = hdgErrAbsDeg / TAU;
      }

      //-------------------------------------------------------
      // define direction of heading rate of change (hdgDotDps)
      //-------------------------------------------------------
      double hdgDotDps = sign(hdgErrDeg) * hdgDotAbsDps;
      psiDot = hdgDotDps * Basic::Angle::D2RCC;

      //-------------------------------------------------------
      // define bank angle as a function of turn rate
      //-------------------------------------------------------
      double phiCmdDeg = std::atan2(psiDot * velMps, Eaagles::ETHGM) * Basic::Angle::R2DCC;
      ok = flyPhi(phiCmdDeg);
   }

   return ok;
}
Ejemplo n.º 2
0
//------------------------------------------------------------------------------
// updateRAC -- update Robot Aircraft
//------------------------------------------------------------------------------
void RacModel::updateRAC(const LCreal dt)
{
   // Get our Player (must have one!)
   Simulation::Player* pp = static_cast<Simulation::Player*>( findContainerByType(typeid(Simulation::Player)) );
   if (pp == nullptr) return;

   // Acceleration of Gravity (M/S)
   LCreal g = ETHG * Basic::Distance::FT2M;

   // Set default commanded values
   if (cmdAltitude < -9000.0)
       cmdAltitude = static_cast<LCreal>(pp->getAltitudeM());
   if (cmdHeading < -9000.0)
       cmdHeading = static_cast<LCreal>(pp->getHeadingD());
   if (cmdVelocity < -9000.0)
       cmdVelocity = pp->getTotalVelocityKts();

   // ---
   // Compute delta altitude; commanded vertical velocity and
   // commanded flight path angle
   // ---

   // Max altitude rate 6000 ft /min converted to M/S
   double maxAltRate = (3000.0 / 60.0) * Basic::Distance::FT2M;

   // commanded vertical velocity is delta altitude limited to max rate
   double cmdAltRate = (cmdAltitude - pp->getAltitudeM());
   if (cmdAltRate > maxAltRate) cmdAltRate = maxAltRate;
   else if (cmdAltRate < -maxAltRate) cmdAltRate = -maxAltRate;

   // Compute commanded flight path angle (gamma)
   double cmdPitch = 0;
   LCreal vt = pp->getTotalVelocity();
   if (vt > 0) {
      cmdPitch = std::asin( cmdAltRate/vt );
   }

   // ---
   // Compute Max G
   // ---
   LCreal gmax = gMax;                     // Max g,s
   if(pp->getTotalVelocity() < vpMaxG) {
      gmax = 1.0f + (gMax - 1.0f) * (pp->getTotalVelocity() - vpMin) / (vpMaxG - vpMin);
   }

   // ---
   // Computer max turn rate, max/min pitch rates
   // ---
   LCreal ra_max = gmax * g / pp->getTotalVelocity();    // Turn rate base on vp and g,s (rad/sec)
   LCreal qa_max = ra_max;                           // Max pull up pitch rate (rad/sec)
   LCreal qa_min = -qa_max;                          // Max pushover pitch rate (rad/sec)
   if(gmax > 2.0) {
      // Max yaw rate (rad/sec)
      qa_min = -( 2.0f * g / pp->getTotalVelocity());
   }

   // ---
   // Get old angular values
   // ---
   const osg::Vec3 oldRates = pp->getAngularVelocities();
   //LCreal pa1 = oldRates[Simulation::Player::IROLL];
   LCreal qa1 = oldRates[Simulation::Player::IPITCH];
   LCreal ra1 = oldRates[Simulation::Player::IYAW];

   // ---
   // Find pitch rate and update pitch
   // ---
   double qa = Basic::Angle::aepcdRad(cmdPitch - pp->getPitchR()) * 0.1;
   if(qa > qa_max) qa = qa_max;
   if(qa < qa_min) qa = qa_min;

   // Find turn rate
   double ra = Basic::Angle::aepcdRad((cmdHeading  * Basic::Angle::D2RCC) - pp->getHeadingR()) * 0.1;
   if(ra > ra_max) ra = ra_max;
   if(ra < -ra_max) ra = -ra_max;

   // Damage
   double dd = pp->getDamage();
   if (dd > 0.5) {
      ra += (dd - 0.5) * ra_max;
      qa -= (dd - 0.5) * qa_max;
   }

   // Using Pitch rate, integrate pitch
   double newTheta = static_cast<LCreal>(pp->getPitch() + (qa + qa1) * dt / 2.0);

   // Use turn rate integrate heading
   double newPsi = static_cast<LCreal>(pp->getHeading() + (ra + ra1) * dt / 2.0);
   if(newPsi > 2.0*PI) newPsi -= 2.0*PI;
   if(newPsi < 0.0) newPsi += 2.0*PI;

   // Roll angle is proportional to max turn rate - filtered
   double pa = 0.0;
   double newPhi = 0.98 * pp->getRollR() + 0.02 * (ra / ra_max * (Basic::Angle::D2RCC * 60.0));

   // Find Acceleration
   double cmdVelMPS = cmdVelocity * (Basic::Distance::NM2M / 3600.0);
   double vpdot = (cmdVelMPS - pp->getTotalVelocity()) * 0.05;
   if(vpdot > maxAccel)  vpdot = maxAccel;
   if(vpdot < -maxAccel) vpdot = -maxAccel;

   // Compute new velocity (body coordinates)
   double newVP = pp->getTotalVelocity() + vpdot * dt;

   // Set our angular values
   pp->setEulerAngles(newPhi, newTheta, newPsi);
   pp->setAngularVelocities(pa, qa, ra);

   // Set our velocity vector (body coordinates)
   pp->setVelocityBody( static_cast<LCreal>(newVP), 0.0, 0.0);

   // Set our acceleration vector (body coordinates)
   pp->setAccelerationBody( static_cast<LCreal>(vpdot), 0.0, 0.0);
}