Sandia 2022 IMAC Four Unit Frame Dynamic Substructuring Results

At IMAC XL Sandia presented results using the Transmission Simulator to create a hybrid assembly of the four unit frame with the thin wing set.

This was complete using hardware:

With connections only used at the four corner points on the interface.

Substructuring Schematic

The team used the traditional Transmission Simulator method performing 3 tests to complete their hybrid predictions.

Testing was completed on:

For each data set testing was performed with a scanning LDV system.

To complete substructuring three experimental sets of data were used to fit modal modes for each substructure

Constraints were defined connecting the wing/plate substructure to a lone plate and the frame/plate substructure the same.

The null space function was used to determine our localization matrix L

L-matrix used to enforce constraints on equations of motion and predict system assembly response

Predictions led to low frequency and damping error with room to improve on modes with elastic transmission simulator motion.