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ERP for a simplified engine model

This is a simplified engine model with base acceleration. It shows how to run equivalent radiated power (ERP) problems with *FREQUENCY_DOMAIN_SSD_ERP and how to postprocess with *DATABASE_FREQUENCY_BINARY_D3SSD. Example 5.4 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.