1 TRACT erimental results obtained during fatigue testing of a lded lap-shear structural-joint specimen are d. In these experiments, the electro-mechanical mpedance technique was used for structural health ing, damage detection, and NDE. The test ns were instrumented with piezo-electric wafer ers, and the base E/M impedance signature was over the relevant frequency range. Fatigue testing lied t...

Deployment of Structural Health Monitoring (SHM) systems for permanent damage detection is limited by the availability of sensor technology. The development of a single board computer system is the focus for initial efforts in realizing a fully self-contained active sensor system utilizing impedance-based SHM. The active sensing system interrogates a structure utilizing a self-sensing actuator ...

The integrity and safety of metallic structures can be jeopardized by structural damage (e.g., yielding, cracking, impact, corrosion) that can occur any time. While various sensors have been proposed and validated for structural health monitoring, most sensors only provide data at a discrete point on the structure. Here, a carbon nanotube-polyelectrolyte sensing skin is proposed for monitoring ...

This paper presents the effects of instrument transformers connection points on the measured impedance by distance relays in the presence of Flexible Alternating Current Transmission System (FACTS) devices with series connected branch. Distance relay tripping characteristic itself depends on the power system structural conditions, pre-fault operational conditions, and especially the ground ...