Conventions: free bodies and the linearized rigid motion
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5858 ## Conventions
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60+- **Free bodies.** The plates and disks are free, and the strikes impart momentum and angular momentum. The outputs are defined with the rigid motion linearized: the acceleration relative to the best-fit rigid frame plus that frame's translational and angular acceleration, which keeps the kick of the strike in the sound and leaves out the slow turning of the body that only an exact three-dimensional solution would show. For modal thin-plate solvers this is what they compute with their rigid modes included.
6061 - A challenge is never changed once solutions from others exist for it. A corrected or modified model gets a new identifier, for example a `-v2` suffix.
6162 - Identifiers (challenges, submissions, solutions) are lowercase letters, digits, and hyphens.
6263 - Field exports for visualization are HDF5 files on a grid recommended by the challenge; they are not scored. Files of a few megabytes live in plain git, larger ones in git LFS or at an external URL.