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

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Curtis L. Olson
Mon Dec 15 13:14:31 CST 1997

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