  This note introduces an unsupervised learning algorithm to debug errors in
finite element (FE) simulation models and details how it was productionised.
The algorithm clusters degrees of freedom in the FE model using numerical
properties of the adjacency of its stiffness matrix. The algorithm has been
deployed as a tool called `Model Stability Analysis' tool within the commercial
structural FE suite Oasys GSA (www.oasys-software.com/gsa). It has been used
successfully by end-users for debugging real world FE models and we present
examples of the tool in action.
