The following lists provide a history of changes to TAMKIT.
v7.0.0
Added functionality to Fast Iterative Residual Kinetic Energy alter.
Minor bug fixes.
v6.3.0
No changes.
v6.2.0
Updated to NX Nastran 11.0.
v6.1.0
No changes.
v6.0.0
No changes.
v5.1.0
Updated to NX Nastran10.1.
v5.0.0
No changes.
v4.6.0
Updated to NX Nastran 9.0.
v4.5.0
No changes.
v4.4.0
Added evaluate_irke_dof.m.
Changed default for fast IRKE alter to write error norms.
Updated to NX 8.5.
v4.3.0
No changes for this release.
v4.2.0
Updated to NX 8.
v4.1.0
Minor documentation updates.
Fix TIER 986.
v4.0.0
Minor bug fixes.
Fix TIER 946, 947.
v3.2.0
Minor bug fixes.
Renamed wrt_irke_aset.m to pch2aset.m
Added alters for NX7.
v3.1.0
Minor documentation updates.
Fix TIER 762
v3.0.0
Ortho alter no longer writes large matrices to the OP4 file.
Minor documentation updates.
v2.60
Add NX6 and MSC v2007 alters.
Minor documentation updates.
v2.50
No changes since the last release.
v2.40
Minor bug fixes
v2.30
Added alters for NX Nastran 5.0
Minor bug fixes
v2.20
No changes since the last release.
v2.11
No changes since the last release.
v2.10
New Features/Enhancements
Initial release for IMAT.
The ortho alter has been modified to optionally calculate cross-orthogonality
and MAC measures between test and FEM as well as between TAM and FEM modes. It will optionally re-normalize the FEM mode shapes to unit modal mass, since this is typically more appropriate when comparing test and FEM modes. It can also calculate residual force vectors and a Minimum Rank stiffness matrix perturbation using the MRPT method. These can be used to localize the error in the analysis model.
The expand_modes alter has been added to expand measured mode shapes using either the TAM expansion matrices or a dynamic or SEREP method.The expanded mode shapes can be visualized in any Nastran post-processor and can be used to calculate modal effective mass of the measured modes. They can also be used to calculate residual forces as a means to localize errors in the analysis model. The alter will also calculate residual force vectors and a Minimum Rank stiffness matrix perturbation using the MRPT method. These can be used to localize the error in the analysis model.
The
compare_modes alter has been added to compare modes from two different models (with a common subset of grids). This is useful for studying the impact of test fixtures, or mass simulators on modal results.
The
iter_guyan alter has been modified to optionally calculate orthogonality error norms at each step.
The
effind alter has been added to implement an effective independence (EI) method to eliminate DOF from a large candidate set. This alter will optionally pre-multiply the mode shapes by the square root of the mass matrix, but does not reduce the mass at every step.
The
iter_rke and fast_iter_rke alters have been added to use an iterative residual kinetic energy (IRKE) method to iteratively add
DOF to a small starting set. The fast_iter_rke alter uses an alternative method for performing the Guyan reduction at each step. It can be an order
of magnitude faster than the standard method, but is limited to structures that are fixed to ground (no rigid body modes). Both versions of the alter
optionally calculate orthogonality error norms as DOF are added.
The
mass_weighted_effind alter has been added to use a mass-weighted effective independence (MWEI) method to eliminate DOF from a large candidate set. This alter performs a Guyan reduction and optionally calculates orthogonality error norms at each step.
References to the Matlab-based GUI driven Genetic Algorithm for Accelerometer Placement have been added. This tool optimally selects an accelerometer set from a candidate set of DOF. It maximizes the linear independence of the test-measured modeshapes by iteratively minimizing an objective function to select accelerometer locations. Accelerometer locations for
multiple FEM configurations can be simultaneously selected.