Structural Dynamics Toolbox

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Experimental Modal Analysis

Frequency domain identification

A complete methodology to solve the frequency domain output error problem is proposed. This includes advanced single pole MIMO estimation and model tuning strategies which fully replace traditional procedures based on stabilization diagrams. This iterative approach is both more intuitive and very often more accurate than methods found in other modal analysis packages. Identification functions include treatment of MIMO models, multiple modes, real and complex modes, reciprocity, non-proportional damping models, as well as transformations between pole/residue, state-space, second-order mass, damping, stiffness, or polynomial forms.

Data Visualization and Analysis

The iicom, iiplot graphical user interface for the visualization of Multiple-Input Multiple-Output (MIMO) datasets easily generates Bode plots, Nyquist plots, Multivariate Mode Indicator Function, complex residue phase spread, pole location, etc. Once the plots generated,simple mouse/key movements let you scan through the data set,get information on certain points, zoom, etc.
SDT 6 introduces a name based handling of datasets and a full revision of the property figure, which makes the interface much more general and suitable for post-processing of FEM responses.

Model format conversion

The SDT provides a full set of two way model format conversion functions for full order finite element models, truncated normal mode nor models traditionally used in structural dynamics, frequency response xf, pole/residue res, state space ss, polynomial transfer function tf. Transformations from frequency response xf to res, ss and nor are supported system identification phases. Transformations from xf and nor formats to full order finite element parameters correspond to finite element update problems. Other transformations have direct analytical expressions and are supported with an emphasis on providing numerically efficient solutions.