Structural Health Evaluation Modular Assembly

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Implementation of structural health monitoring systems on to large scale civil structures continues to face many challenges. The general SHM paradigm, in data-driven modes, calls for at least two learning cases: the structure in some reference state, and the structure in its target damaged state(s). Because of the complexity of civil structures in geometry, material composition, construction, and operational/environmental conditions, the task of developing a robust understanding of how to develop an optimal SHM system design for acquiring data and transforming it into a decision is daunting. The SHEMA structure developed by the UCSD structural health monitoring group will provide a controllable design testbed with which to bridge the gap between nascent SHM solution ideas and and large scale civil structure implementation.

What makes SHEMA unique is its modularity. The SHEMA structure was conceived and designed as an amorphous modular test-bed for numerous monitoring approaches from vibration to acoustic to ultrasonic guided wave system identification research. This is accomplished by the custom designed beams and joints that allow for rapid alterations in structural configuration. In essence, researchers can perform baseline measurements on a configuration, and then switch-out a "healthy" component (beam / joint) for one that contains a damage feature (crack, hole, etc.) in a way that preserves a desired level of robustness to isolate certain effects as appropriate.

The overarching objective is to develop an understanding of how various SHM measurement and feature extraction process, across multiple time scales, compare in various performance assessment metrics on a controllable yet complex structure.