Publications

Walsh, Timothy W.; Aquino, Wilkins A.; Kurzawski, Andrew K.; McCormick, Cameron M.; Sanders, Clay M.; Smith, Chandler B.; Treweek, Benjamin T.

Many engineering design problems can be formulated as decisions between two possible options. This is the case, for example, when a quantity of interest must be maintained below or above some threshold. The threshold thereby determines which input parameters lead to which option, and creates a boundary between the two options known as the decision boundary. This report details a machine learning approach for estimating decision boundaries, based on support vector machines (SVMs), that is amenable to large scale computational simulations. Because it is computationally expensive to evaluate each training sample, the approach iteratively estimates the decision boundary in a manner that requires relatively few training samples to glean useful estimates. The approach is then demonstrated on three example problems from structural mechanics and heat transport.

Walsh, Timothy W.; Akcelik, Volkan A.; Aquino, Wilkins A.; McCormick, Cameron M.; Sanders, Clay M.; Treweek, Benjamin T.; Kurzawski, Andrew K.; Smith, Chandler B.

The inverse methods team provides a set of tools for solving inverse problems in structural dynamics and thermal physics, and also sensor placement optimization via Optimal Experimental Design (OED). These methods are used for designing experiments, model calibration, and verfication/validation analysis of weapons systems. This document provides a user's guide to the input for the three apps that are supported for these methods. Details of input specifications, output options, and optimization parameters are included.