For general information about creating an analysis system see Create Analysis System in the Mechanical User's Guide.
From the Toolbox drag an Explicit Dynamics or an LS-DYNA template to the Project Schematic.
Note: Explicit Dynamics analyses only support the mm, mg, ms solver unit system (see Solving Units in the LS-DYNA User's Guide for supported units in an LS-DYNA analysis).
The Explicit Dynamics solver is double precision (an LS-DYNA analysis can use single or double precision).