7.3. HBM Cyclic Analysis: Postprocessing

In a regular HBM analysis, results for each harmonic are written into separate results (.rst) files. For an HBM cyclic analysis, however, note the following:

  1. The response is stored in cyclic coordinates (base and duplicate sector) and must be manipulated to get the physical DOFs response.

  2. The response at a node in cyclic coordinates is scattered across several nodes in the numerical model (one node for each time harmonic).

Two macros are provided to help postprocess those results:

  • HBMCYCMAPGET provides the mapping between any node from the primary stage and the corresponding nodes for higher harmonic stages.

  • HBMCYCEXPAND computes the time response amplitude at each frequency. It requires preliminary calls to the HBMCYCMAPGET and HBMCYCHIGET macros.

Example

The following example snippet and selected output show the HBM cyclic postprocessing at node 1 of the 3rd sector of the cyclic structure.

!!! HBM CYCLIC POSTPROCESSING

node_num = 1
sector   = 3
HBMCYCMAPGET,node_num,NH
HBMCYCHIGET,Nsec,EO,NH,'expa'
HBMCYCEXPAND,jobn,'U','Z',Nsec,NH,sector,'minmax'