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SSD with base and enforced motion

This sequence of two examples shows how to set up an input file for large mass method. In the first file a rectangular plate is computed with base acceleration using *FREQUENCY_DOMAIN_SSD. In the second file for the same structure large mass method is applied with keywords *CONTROL_FREQUENCY_DOMAIN, *ELEMENT_MASS_NODE_SET and *BOUNDARY_SPC. Example 5.2 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.