Extract the Rigid Body Properties of a Structure from Measured FRFs
The FEMtools Rigid Body Properties Extractor (Ft-RBPE) is a FEMtools add-on tool for extracting the rigid body properties of a structure from a set of measured Frequency Response Functions (FRFs). The following properties are obtained from the low-frequency portion of measured accelerances:
Center of gravity locations (CoG)
Mass moments of inertia (MoI)
The rigid body properties can be used to validate a finite element model, for substructuring or motion analysis.
The Ft-RBPE is installed and used as an add-on to the FEMtools Framework or any other FEMtools configuration.
The rigid body properties are obtained by dedicated experimental testing (FRFs) and can be used as reference values for validating a finite element models. Other applications include:
Automated model updating using rigid body properties as reference target.
Reduce components to lumped masses for model substructuring in structural dynamics simulations or motion analysis.
Generation of rigid body modes for modal-based synthesis.
Easy to Use – A single control window is used for all settings, data visualization and table with results.
Cost Effective – Using the same equipment for experimental modal analysis, FRFs are inexpensive to obtain compared to traditional experimental methods that use dedicate machinery to identify CoG and MoI.
Robust Solutions – Rigid body properties are obtained from a (redundant) set of FRFs using curve fitting and straightforward equation solving. Assess the uncertainty of the results using error estimators.