## I. Additional Tools

### 1. Materials

With the help of the Cpiezo button,the user can display properties of the materials stored in the materialsdatabase. Cpiezo is not a complete tool, but it ishelpful for simple cases. The values provided by the MATERIAL entry in the datafile are the best place to check material properties. Depending on the numberof properties, a given material is defined as elastic, fluid orpiezoelectric/magnetostrictive. After clicking on the Cpiezo button, the user must enter the name of the material.

For an elastic material, the longitudinal and transversespeeds are displayed.

For a fluid material, the longitudinal speed is displayed.

For a piezoelectric (magnetostrictive) material, it isassumed that the material belongs to the crystalline class 6mm. The constants sE,sD, cE, cD, d, g, h, e, eS,eT; bSand bT (sH, sB, cH,cB, d, g, h, e, mS, mT; cS and cT) and the coupling factors k33, k13,k15, and kT are displayed.

You can create lossy piezoelectric or magnetostrictivematerials from non-lossy ones, by specifying loss factors on the three mainconstants blocks (Mpiezo).

You can check that a piezoelectric or magnetostrictivematerial is effectively lossy (dissipating, not absorbing heat) (Ppiezo).

Materials Database button will soonbe available.

### 2. Expert

The Expert menu points to differenttools that are described below.

- Atlist: After running a solver, the user can output thedisplacements for a selected frequency, time or loading case, exactly as theoutput of the solver when the PRINTING level is set to1 or more. You can also output the displacement for several specific nodes anddegrees of freedom for all frequencies, times or loading cases. These actionsare driven by the program ATLIST.
- Tmono, Tdip2: For active and/or radiating structures, in case thedirectivity patterns file (.PAT file) is accidentallydeleted or corrupted, the user does not need to rerun the job. Because all valuable data is saved in the .SY4 file, the directivity patterns file can be recreated with the programs TDIP2 (2D structures, extrapolation method) or TMONO (when the fluid dampers stand in the far field).
- Trpcp, Trpcp2: For active structures, in case the parallel impedance file(.RPCP file) is accidentally deleted or corrupted, the user does not need to rerun the job. Because all valuable data is saved in the .SY4 file, the impedance file can be recreated with theprogram TRPCP. Alternatively, if the symmetriesdetected by the solver are incorrect, the user can force the symmetry factorwith the help of the TRPCP2 program.
- Sy4topst: ISOVAL requires the data stored inthe post-processing file .pst. This file is generatedby ATILA if a GENERATION PST entry has been provided in the .ati data file before using the solver (see Chapter III). If this command does not appear in the .ati file, it is possible to recreate the .pst file using the program sy4topst. Nevertheless, the stresses cannot be calculated using sy4topst. In that case, the user has to run the solver again.
- Sy4tosup: This program gives the parameters that are used in modal superposition and represents the transducer with the help of an equivalent electrical circuit. Performing an ANALYSIS MODAL of an in-vacuum structure with ATILA gives the resonance frequencies, noted fR(m) and the corresponding displacement fields, noted Umod(n,m), where m is the mode number of the finite elementanalysis and n is the reference node number of the finite element mesh N is the total number of nodes in the structure. Then, the in-vacuum structurebehavior can be represented by an equivalent electrical circuit, where the C0blocked capacitance is in parallel with NLOAD branches. Each branch representsone mode and contains a capacitance C(n,m)N2(n,m) in series with aninductance L(n,m)/N2(n,m), whose values are independent of the nodenumber n. Using the sy4tosup button, for a given nodenumber, the program gives the values of N(n,m), C(n,m) and L(n,m). Then, theprogram uses the parameters of the equivalent electrical circuit to recalculate the resonance and the antiresonance frequencies of the structure. If these frequencies are not equal to the resonance and antiresonance frequencies givenby an ANALYSIS MODAL RESANTIRES, it means that notenough NLOAD branches are taken into account in the equivalent electrical circuit. Thus, the user has to run the problem again an ANALYSIS MODAL with a higher number of NLOAD.
- Sy4toHar: Using the modal superposition that has been performed withan ANALYSIS MODAL, sy4tohar calculates the displacement at a given node and at a given frequency from thedata of the equivalent electrical circuit.
- Celepo, Cdisp: When dealing with modal analysis of periodic materials, some useful information may be extracted from raw data: dispersion curves canbe deduced from the different wave numbers and associated frequencies bycareful ordering (program CDISP); the phase speed and mean polarization of each wave number and associated frequencies can be calculated (program CELEPO); from the low-frequency limit of longitudinal and transversal waves, a set of equivalent orthotropic materialconstants can be extracted.

### 3. Options

The Options command changes thelanguage (English or French).It defines the language used for the entry input and output. In France, the default language is French; in other countries, it is English.