STRAT: a Sketched-truss Recognition and Analysis Tool

The statically-determinate, pin-connected truss is a basic structural element used by engineers to create larger and more complex systems. Truss analysis and design are topics that virtually all students who study engineering mechanics are required to master, many of whom may experience difficulty with initial understanding. The mathematics used to analyze truss systems typically requires lengthy hand calculations or the assistance of proprietary computer-aided design (CAD) programs. To expedite work in this domain, we propose: STRAT (Sketched-Truss Recognition and Analysis Tool), a freehand sketch recognition system for solving truss problems. The STRAT system allows users to rapidly determine all of the unknown forces in a truss, using only a hand-drawn sketch of the truss itself. The focus of this article covers the design methodology and implementation of the STRAT system. Results from a preliminary user study are also presented.