Statistical energy analysis (SEA) is commonly used in industry to predict high-frequency vibrational response of structures. Since only local modes are used in SEA, only high-frequency responses can be predicted. This study extends SEA to the middle-frequency region by additionally using global modes. Methods using impedance matrices that can be found by NASTRAN are developed. Then the results are post processed to determine coupling loss factors.
Yan, H., Parrett, A., & Nack, W. (2000). Statistical energy analysis by finite elements for middle frequency vibration. Finite Elements in Analysis and Design, 35(4), 297–304. https://doi.org/10.1016/S0168-874X(99)00071-2