Finite Element Model Tuning Using Measured Mass Properties and Ground Vibration Test Data

A simple and efficient approach for tuning finite element models to match computed frequencies, mode shapes, and mass properties to the experimental data is introduced in this study. The model tuning procedure proposed in this study is based on a series of optimizations. This approach has been successfully applied to create an equivalent beam finite element model for the X-37 drogue chute test fixture with the X-planes pylon. The goal was a simple model capable of being analyzed in a captive carry configuration with the B-52H mother ship. This study has shown that natural frequencies, corresponding mode shapes, and mass properties from the updated finite element model achieved at the final optimization iteration have excellent agreement with corresponding measured data.