LaRCsim Files
Here is my attempt to organize descriptions of the various LaRCsim files required to implement the equations of flight. 99% of the following text is copied straight out of email from Bruce, source code comments, or the LaRCsim manual.
Core LaRCsim Header Files
- ls_generic.h:
- 1 LaRCSim generic parameters header file. Defines
the ``GENERIC'' structure which holds the current value of the
flight model parameters and states.
- ls_types.h:
- LaRCSim type definitions header file. Defines
the following types: SCALAR, VECTOR_3, and DATA.
- ls_constants.h:
- LaRCSim constants definition header file.
Defines various constants and various units conversions.
- ls_sim_control.h:
- LaRCSim simulation control parameters
header file
Core LaRCsim Routines
The following share the ls_generic.h, ls_types.h, and ls_constants.h header files.
- ls_accel.c:
- ls_accel() sums the forces and moments from aero,
engine, gear, transfer them to the center of gravity, and calculate
resulting accelerations.
- ls_step.c:
- ls_step() Integration routine for equations of
motion (vehicle states.) Integrates accels
velocities and velocities positions.
- ls_aux.c:
- ls_aux() Takes the new state information
(velocities and positions) and calculates other information, like
Mach, pressures & temps, alpha, beta, etc. for the new state. It
does this by calling atmos_62() ls_geodesy() and ls_gravity().
- atmos_62.c
- atmos_62() 1962 standard atmosphere table lookups.
- ls_geodesy.c
- ls_geoc_to_geod(lat_geoc, radius, lat_geod, alt,
sea_level_r) ls_geod_to_geoc(lat_geod, alt, sl_radius, lat_geoc)
since vehicle position is in geocentric lat/lon/radius, this
routine calculates geodetic positions lat/lon/alt ls_gravity -
calculates local gravity, based on latitude & altitude.
- ls_gravity:
- ls_gravity( SCALAR radius, SCALAR lat, SCALAR
*gravity ) Gravity model for LaRCsim.
Secondary LaRCsim Routines
The following routines help manage the simulation
- ls_model.c:
- ls_model() Model loop executive. Calls the user
supplied routines: inertias(), subsystems(), engine(), aero(), and
gear().
- default_model_routines.c:
- Provides stub routines for the
routines that are normally provided by the user.
Navion Specific Routines
- ls_cockpit.h:
- Header for cockpit IO. Stores the current
state of all the control inputs.
- navion_aero.c:
- aero() Linear aerodynamics model. Initializes
all the specific parameters if not initialized. The expected
outputs from aero() are the aerodynamic forces and moments about
the reference point, in lbs and ft-lbs, respectively, being stored
in the F_aero_v and M_aero_v vectors.
- navion_engine.c:
- engine() Calculate the forces generated by
the engine.
- navion_gear.c:
- gear() Landing gear model for example simulation.
- navion_init.c:
- model_init() Initializes navion math model
About this document ...
This document was generated using the LaTeX2HTML translator Version 96.1 (Feb 5, 1996) Copyright © 1993, 1994, 1995, 1996, Nikos Drakos, Computer Based Learning Unit, University of Leeds.
The command line arguments were:
latex2html -split 0 LaRCsim-notes.tex.
The translation was initiated by Curtis L. Olson on Mon Dec 15 13:14:31 CST 1997
Curtis L. Olson
Mon Dec 15 13:14:31 CST 1997
