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BEM acoustics of a beam subjected to SSD

A rectangular beam is subjected to frequency domain acceleration. BEM acoustic analysis is coupled with SSD excitation via *FREQUENCY_DOMAIN_SSD. *FREQUENCY_DOMAIN_ACOUSTIC_BEM uses variational indirect BEM and raised cosine windowing technique for FFT. In the file domgeom.k the domain decomposition can be studied. Example 8.4 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.