Parameter

Values

Description

ODS

<YES, NO>

Default = NO

Typically, an Operating Deformed Shape (ODS) run requires the output for all the elements or all the grids for limited loading frequencies of interest. The specific frequencies may come from peak responses. Even though the recovery is needed for the limited number of frequencies, the full eigenvectors are needed to recover the displacement for all degree of freedom inside modal FRF solution. Usually the number of limited loading frequencies is much less than the number of eigenvectors. The recovery of eigenvectors takes significant amount of time for AMSES/AMLS eigensolvers. Furthermore, there is a need for huge disk space requirement to keep the full eigenvectors.

YES: Reduces both computational time and disk space utilization to recover the displacements for all degree of freedom. In this process, Optistruct would keep some of the AMSES/AMLS scratch space in disk. After the modal FRF solution, this tree structure would be used to recover operating deformed shape at limited frequencies and the scratch space from AMLS/AMSES would be deleted soon after.

NO: Eigen vectors from AMLS/AMSES would be directly recovered for the required degree of freedom. Also, the scratch space of AMSES/AMLS would not be stored in the disk.