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Appendix 2: Non radial loading paths (1)
One can impose actualized coordinates, temperatures or pressures on fixed DOF, or concentrated forces on non fixed DOF, without using the preprocessor. All the histories of force or displacement are then possible. A radial history is no more compulsory. The imposed forces and displacements multipliers are no more used.
The imposed forces are saved on the file n° 32 (*.LOA), the actualized imposed coordinates on the file n° 31 (*.DEP) and the values of multipliers FMULT and DMULT on the format file n°33 (*.LIC, see APPENDIX 3 : NON RADIAL LOADING PATHS (2)). The variable IPRES orders the reading.
| IPRES | = 0 no effect |
| = 1 or 3 or 18 or 38 orders the reading of the imposed DOF on the file n° 31 (in INIDDL) | |
| = 2 or 3 or 6 or 28 or 38 orders the reading of the imposed forces on the file n° 32 (in NORME1) | |
| = 5 or 6 or 8 or 18 orders the reading of the imposed accelerations on the file n° 33 (in INIDDL) (?? Toujours correct ??? … le fichier 33 est le fichier *.LIC !!!) |
Remark 1: a new method has been implemented to read the files DEP and LOA (not the LIC). But if you add 200 to IPRES, you can still use the old method to read the files (rewind the file at the beginning of each time step).
Remark 2: IPRES = 5 or 6 is only used in dynamic analysis.
It is now possible to impose a periodic solicitation by giving only points on the first period (t in [0, T]). For each step, Lagamine calculates the phase as a function of time and frequency FREQ, then reads the corresponding entry in the .loa or .dep file (according to IPRES value).
The files n° 31, 32 have a special format. This one is identical for the two files (for n°33 file, see appendix 3) :
| 1st group (3I5, G10.0) | |
|---|---|
| NPAS | Number of definition moments of the imposed values |
| NENR | Number of definitions at each moment |
| IFOR | = 1 if the format of the group 2.2. is read |
| = 0 if the format by default of the group 2.2. is used | |
| FREQ | > 0 → Frequency of solicitation (if periodic one: then we will write in the .loa or .dep file only values at the times between 0 sec and T= FREQ-1). < 0 → Period of solicitation (if periodic one: then we will write in the .loa or .dep file only values at the times between 0 sec and T=-FREQ) = 0 → If FREQ is null or omitted, periodicity will be ignored. |
| If IFOR = 1 (A70) | |
| FORMT | Format of the group 2.2., in parentheses ex. (2I5, G15.0) |
| 2nd group: NPAS groups of (NENR + 1) lines | |
| 1st line (G10.0) | |
| Time | Definition moment of the imposed values. This moment is compared to the accumulated time, sum of the DELTAT given in the command file. A linear interpolation is realized if a computation step is situated between two definition moments. |
| 2nd to NENR lines (2I5, G10.0 or FORMT) | |
| INODE | Node number |
| IDDL | DOF number where the value is imposed  imposed DOF on fixed DOF only imposed force on free DOF only |
| VALIM | Imposed value (DOF or force) |
