Incorporating Jon S. Berndt's flight model code.

diff --git a/FDM/JSBsim.cxx b/FDM/JSBsim.cxx
new file mode 100644 (file)
index 0000000..9ae6d66
--- /dev/null
+++ b/FDM/JSBsim.cxx
@@ -0,0 +1,227 @@
+// JSBsim.cxx -- interface to the JSBsim flight model
+//
+// Written by Curtis Olson, started February 1999.
+//
+// Copyright (C) 1999  Curtis L. Olson  - curt@flightgear.org
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+// $Id$
+// (Log is kept at end of this file)
+
+
+#define FDM_MAIN
+#include <FDM/JSBsim/FGFDMExec.h>
+#undef FDM_MAIN
+
+#include "JSBsim.hxx"
+
+#include <Aircraft/aircraft.hxx>
+#include <Controls/controls.hxx>
+#include <Debug/logstream.hxx>
+#include <Include/fg_constants.h>
+#include <Math/fg_geodesy.hxx>
+
+
+// Initialize the JSBsim flight model, dt is the time increment for
+// each subsequent iteration through the EOM
+int fgJSBsimInit(double dt) {
+    FG_LOG( FG_FLIGHT, FG_INFO, "Starting initializing JSBsim" );
+
+    FDMExec = new FGFDMExec();
+    FG_LOG( FG_FLIGHT, FG_INFO, "  created FDMExec" );
+
+    Aircraft->LoadAircraft("X15");
+    FG_LOG( FG_FLIGHT, FG_INFO, "  loaded aircraft" );
+
+    State->Reset("reset00");
+    FG_LOG( FG_FLIGHT, FG_INFO, "  loaded initial conditions" );
+
+    State->Setdt(dt);
+    FG_LOG( FG_FLIGHT, FG_INFO, "  set dt" );
+
+    FG_LOG( FG_FLIGHT, FG_INFO, "Finished initializing JSBsim" );
+
+    return 1;
+}
+
+
+// Run an iteration of the EOM (equations of motion)
+int fgJSBsimUpdate(FGInterface& f, int multiloop) {
+    double save_alt = 0.0;
+
+    // lets try to avoid really screwing up the JSBsim model
+    if ( f.get_Altitude() < -9000 ) {
+       save_alt = f.get_Altitude();
+       f.set_Altitude( 0.0 );
+    }
+
+    // copy control positions into the JSBsim structure
+    FCS->SetDa( controls.get_aileron() );
+    FCS->SetDe( controls.get_elevator() + controls.get_elevator_trim() );
+    FCS->SetDr( controls.get_rudder() );
+    FCS->SetDf( 0.0 );
+    FCS->SetDs( 0.0 );
+    FCS->SetThrottle( controls.get_throttle( 0 ) );
+    // FCS->SetBrake( controls.get_brake( 0 ) );
+
+    // Inform JSBsim of the local terrain altitude
+    // Runway_altitude =   f.get_Runway_altitude();
+
+    // old -- FGInterface_2_JSBsim() not needed except for Init()
+    // translate FG to JSBsim structure
+    // FGInterface_2_JSBsim(f);
+    // printf("FG_Altitude = %.2f\n", FG_Altitude * 0.3048);
+    // printf("Altitude = %.2f\n", Altitude * 0.3048);
+    // printf("Radius to Vehicle = %.2f\n", Radius_to_vehicle * 0.3048);
+
+    State->Setsim_time(State->Getsim_time() + State->Getdt() * multiloop);
+    FDMExec->Run();
+
+    // printf("%d FG_Altitude = %.2f\n", i, FG_Altitude * 0.3048);
+    // printf("%d Altitude = %.2f\n", i, Altitude * 0.3048);
+    
+    // translate JSBsim back to FG structure so that the
+    // autopilot (and the rest of the sim can use the updated
+    // values
+
+    fgJSBsim_2_FGInterface(f);
+
+    // but lets restore our original bogus altitude when we are done
+    if ( save_alt < -9000.0 ) {
+       f.set_Altitude( save_alt );
+    }
+
+    return 1;
+}
+
+
+// Convert from the FGInterface struct to the JSBsim generic_ struct
+int FGInterface_2_JSBsim (FGInterface& f) {
+
+    return 1;
+}
+
+
+// Convert from the JSBsim generic_ struct to the FGInterface struct
+int fgJSBsim_2_FGInterface (FGInterface& f) {
+
+    // Velocities
+    f.set_Velocities_Local( State->GetVn(), State->GetVe(), State->GetVd() );
+    // f.set_Velocities_Ground( V_north_rel_ground, V_east_rel_ground, 
+    //                      V_down_rel_ground );
+    // f.set_Velocities_Local_Airmass( V_north_airmass, V_east_airmass,
+    //                             V_down_airmass );
+    // f.set_Velocities_Local_Rel_Airmass( V_north_rel_airmass, 
+    //                          V_east_rel_airmass, V_down_rel_airmass );
+    // f.set_Velocities_Gust( U_gust, V_gust, W_gust );
+    // f.set_Velocities_Wind_Body( U_body, V_body, W_body );
+
+    // f.set_V_rel_wind( V_rel_wind );
+    // f.set_V_true_kts( V_true_kts );
+    // f.set_V_rel_ground( V_rel_ground );
+    // f.set_V_inertial( V_inertial );
+    // f.set_V_ground_speed( V_ground_speed );
+    // f.set_V_equiv( V_equiv );
+
+    /* ***FIXME*** */ f.set_V_equiv_kts( State->GetVt() );
+    // f.set_V_calibrated( V_calibrated );
+    // f.set_V_calibrated_kts( V_calibrated_kts );
+
+    f.set_Omega_Body( State->GetP(), State->GetQ(), State->GetR() );
+    // f.set_Omega_Local( P_local, Q_local, R_local );
+    // f.set_Omega_Total( P_total, Q_total, R_total );
+    
+    // f.set_Euler_Rates( Phi_dot, Theta_dot, Psi_dot );
+    // ***FIXME*** f.set_Geocentric_Rates( Latitude_dot, Longitude_dot, Radius_dot );
+
+    // Positions
+    double lat = State->Getlatitude();
+    double lon = State->Getlongitude();
+    double alt = State->Geth();
+    double lat_geoc, sl_radius;
+    fgGeodToGeoc( lat, alt * FEET_TO_METER, &sl_radius, &lat_geoc );
+
+    FG_LOG( FG_FLIGHT, FG_DEBUG, "lon = " << lon << " lat = " << lat 
+           << " lat_geoc = " << lat_geoc
+           << " alt = " << alt 
+           << " sl_radius = " << sl_radius * METER_TO_FEET);
+           
+    f.set_Geocentric_Position( lat_geoc, lon, sl_radius * METER_TO_FEET + alt );
+    f.set_Geodetic_Position( lat, lon, alt );
+    f.set_Euler_Angles( State->Getphi(), State->Gettht(), State->Getpsi() );
+
+    // Miscellaneous quantities
+    // f.set_T_Local_to_Body(T_local_to_body_m);
+    // f.set_Gravity( Gravity );
+    // f.set_Centrifugal_relief( Centrifugal_relief );
+
+    f.set_Alpha( State->Getalpha() );
+    f.set_Beta( State->Getbeta() );
+    // f.set_Alpha_dot( Alpha_dot );
+    // f.set_Beta_dot( Beta_dot );
+
+    // f.set_Cos_alpha( Cos_alpha );
+    // f.set_Sin_alpha( Sin_alpha );
+    // f.set_Cos_beta( Cos_beta );
+    // f.set_Sin_beta( Sin_beta );
+
+    // f.set_Cos_phi( Cos_phi );
+    // f.set_Sin_phi( Sin_phi );
+    // f.set_Cos_theta( Cos_theta );
+    // f.set_Sin_theta( Sin_theta );
+    // f.set_Cos_psi( Cos_psi );
+    // f.set_Sin_psi( Sin_psi );
+
+    // ***ATTENDTOME*** f.set_Gamma_vert_rad( Gamma_vert_rad );
+    // f.set_Gamma_horiz_rad( Gamma_horiz_rad );
+
+    // f.set_Sigma( Sigma );
+    // f.set_Density( Density );
+    // f.set_V_sound( V_sound );
+    // f.set_Mach_number( Mach_number );
+
+    // f.set_Static_pressure( Static_pressure );
+    // f.set_Total_pressure( Total_pressure );
+    // f.set_Impact_pressure( Impact_pressure );
+    // f.set_Dynamic_pressure( Dynamic_pressure );
+
+    // f.set_Static_temperature( Static_temperature );
+    // f.set_Total_temperature( Total_temperature );
+
+    /* **FIXME*** */ f.set_Sea_level_radius( sl_radius * METER_TO_FEET );
+    /* **FIXME*** */ f.set_Earth_position_angle( 0.0 );
+
+    /* ***FIXME*** */ f.set_Runway_altitude( 0.0 );
+    // f.set_Runway_latitude( Runway_latitude );
+    // f.set_Runway_longitude( Runway_longitude );
+    // f.set_Runway_heading( Runway_heading );
+    // f.set_Radius_to_rwy( Radius_to_rwy );
+
+    // f.set_CG_Rwy_Local( D_cg_north_of_rwy, D_cg_east_of_rwy, D_cg_above_rwy);
+    // f.set_CG_Rwy_Rwy( X_cg_rwy, Y_cg_rwy, H_cg_rwy );
+    // f.set_Pilot_Rwy_Local( D_pilot_north_of_rwy, D_pilot_east_of_rwy, 
+    //                        D_pilot_above_rwy );
+    // f.set_Pilot_Rwy_Rwy( X_pilot_rwy, Y_pilot_rwy, H_pilot_rwy );
+
+
+    return 0;
+}
+
+
+// $Log$
+// Revision 1.1  1999/02/05 21:29:38  curt
+// Incorporating Jon S. Berndt's flight model code.
+//

diff --git a/FDM/JSBsim.hxx b/FDM/JSBsim.hxx
new file mode 100644 (file)
index 0000000..0e9bdb1
--- /dev/null
+++ b/FDM/JSBsim.hxx
@@ -0,0 +1,52 @@
+// JSBsim.hxx -- interface to the "JSBsim" flight model
+//
+// Written by Curtis Olson, started February 1999.
+//
+// Copyright (C) 1999  Curtis L. Olson  - curt@flightgear.org
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+// $Id$
+// (Log is kept at end of this file)
+
+
+#ifndef _JSBSIM_HXX
+#define _JSBSIM_HXX
+
+#include <FDM/JSBsim/FGFDMExec.h>
+
+#include <Aircraft/aircraft.hxx>
+
+
+// reset flight params to a specific position 
+int fgJSBsimInit(double dt);
+
+// update position based on inputs, positions, velocities, etc.
+int fgJSBsimUpdate(FGInterface& f, int multiloop);
+
+// Convert from the FGInterface struct to the JSBsim generic_ struct
+int FGInterface_2_JSBsim (FGInterface& f);
+
+// Convert from the JSBsim generic_ struct to the FGInterface struct
+int fgJSBsim_2_FGInterface (FGInterface& f);
+
+
+#endif // _JSBSIM_HXX
+
+
+// $Log$
+// Revision 1.1  1999/02/05 21:29:38  curt
+// Incorporating Jon S. Berndt's flight model code.
+//