| # Temporal sampling and peak-event time |
|
|
| ## Raw solver output |
|
|
| Each LS-DYNA simulation terminates at 0.03 s. D3PLOT is requested at a nominal |
| 0.0002-s interval. Actual floating-point state times can differ slightly from |
| the nominal values and are therefore stored explicitly. |
|
|
| ## Compact 17-state sequence |
|
|
| Compact conversion uses stride 10 on both nodal displacement and shell stress, |
| then appends the final available state when it is not already selected. Across |
| all released cases, both `time_indices` and `element_time_indices` equal: |
|
|
| `[0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 151]`. |
|
|
| The first 16 retained states therefore have a nominal spacing of 0.002 s. Index |
| 151 is the appended terminal state and can be separated from index 150 by much |
| less than 0.002 s. Consumers must use the stored `time` and `element_time` |
| arrays rather than reconstructing timestamps from an assumed uniform interval. |
|
|
| ## Discrete peak-event definition |
|
|
| Let T17 be the 17 retained states, Vvalid the valid-node set, and u_i(t) the |
| three-dimensional nodal displacement. The supplied peak-target builder uses |
| |
| `t* = argmax_(t in T17) max_(i in Vvalid) ||u_i(t)||_2`. |
| |
| The implementation flattens the node-by-retained-state magnitude array and |
| uses the first maximum returned by `torch.argmax`. The displacement field and |
| the shell von Mises effective-stress field at the same selected retained state |
| form the paired peak-event target. |
| |
| Accordingly, `t*` is quantized to the released 17-state grid. It is not an |
| interpolated time and is not guaranteed to equal the continuous-time maximum |
| over every raw solver state. |
| |
