Reduced order structural model results

A `ReducedStructuralModel`

object contains the
stiffness matrix K, mass matrix M, mesh, multipoint constraint reference locations, and IDs of
retained degrees of freedom.

To expand this data to a full solution that includes displacement, velocity, and
acceleration, use `reconstructSolution`

.

Reduce a structural model by using the `reduce`

function. This
function returns structural results obtained using the Craig-Bampton reduced order method as a
`ReducedStructuralModel`

object.

`reconstructSolution` | Recover full-model transient solution from reduced-order model results |

`StructuralModel`

| `reconstructSolution`

| `reduce`

| `structuralBC`

| `structuralSEInterface`