# V. Pre-Processing and Non Graphic Procedures

## A. Introduction

ATILA can provide several differenttypes of numerical output:

- The user can create an ATILA data file from a file describing "super-elements" and instructions on how to divide them. This finite-element mesh generator,named MOSAIQUE, is a non-graphic preprocessor of the ATILA code that generatesall the necessary element and node data for ATILA. A super-element can be aone-dimensional, two-dimensional or three-dimensional element. It is possibleto assign different types of elements (triangle, quadrilateral, hexahedron, andprism) to a super-element.
- The user can display properties of the materials stored in thematerials database (CPIEZO program). He or she can create lossy piezoelectricor magnetostrictive materials from non-lossy ones, by specifying loss factorson the three main constants blocks (MPIEZO program). He or she can check that apiezoelectric or magnetostrictive material is effectively lossy (dissipating,not absorbing heat) (PPIEZO program).
- After running a solver, the user can output the displacements fora selected frequency, time or loading case, exactly as the output of the solverwhen the PRINTING level is set to 1 or more. He or she can also output thedisplacement for several specific nodes and degrees of freedom for allfrequencies, times or loading cases. These actions are driven by the ATLIST program.
- For active structures, in case the parallel impedance file(*.RPCP file) is accidentally deleted or corrupted, the user does not need torerun the job. Because all valuable data is saved in the *.SY4 file, thisimpedance file can be recreated with the TRPCP program. Alternatively, if thesymmetries detected by the solver are incorrect, the user can force thesymmetry factor with the help of the TRPCP2 program. When the structure ismagnetostrictive, it is preferable to deal with series impedance. The TRSLSprogram is thus useful to regenerate a series impedance file (*.RSLS file).
- For active and/or radiating structures, in case the directivitypatterns file (*.PAT file) is accidentally deleted or corrupted, the user doesnot need to rerun his job. Because all valuable data is saved in the *.SY4file, this directivity patterns file can be recreated with the TDIP2 program(2D structures, extrapolation method) or the TMONO program (when the fluiddampers stand in the far field).
- When dealing with modal analysis of periodic materials, someuseful information may be extracted from raw data: dispersion curves can bededuced from the different wave numbers and associated frequencies by carefulordering (CDISP program); the phase speed and mean polarization of each wavenumber and associated frequencies can be calculated (program CELEPO program);from the low-frequency (long wavelength) limit of longitudinal and transversalwaves, a set of equivalent orthotropic material constants can be extracted(HOMOGN program).