Symbolic generation of aircraft simulation programmes

The main features of a multi-purpose computer programme which provides the equations of motion of aircraft in symbolic form and can be used in various testing and simulation procedures are presented. The entries of the programme are compatible with ISO standards. Various possibilities are given to the users and, when appropriate, standard choices are suggested. Both kinematical and dynamical equations are derived. The standard variables of the problem are the actual geographical position of the reference point or cartesian coordinates, the velocity with respect to the atmosphere represented by its norm and its orientation with respect to the ground and to the aircraft and the body angular velocity. The parameters of the system, which appear in literal form, are the aircraft parameters and the various geographical and meteorological constants. The control variables can be described in terms of actuators position or can be given as controller outputs. Meteorological perturbations can also be considered as specific entries. The programme is written in C-language, but its output is a standard FORTRAN subroutine which can be used as such by the user. This programme can be used for simulation and design purposes for the vehicle and its control and navigation systems. It can also be used for air traffic control simulation and trajectory optimization. Coupled with a numerical linearization subroutine, it also proves useful for stability analysis.Anglai