Charles R. Farrar

TL;DR: The development, validation, and testing of a remote tap testing device that can be deployed by an aerial robot is described to enable cost-effective, safer and sustainable upgrade prioritization of railroad bridge inventories.

TL;DR: In this paper, a Lamb wave propagation-based Structural Health Monitoring (SHM) system is used to identify common features of undamaged paths, which can be used as a baseline for near real-time damage detection.

TL;DR: In this paper, the drift limits for low aspect ratio reinforced concrete shear walls are investigated by reviewing the open literature for appropriate experimental data, based on the geometry of structures d....

TL;DR: The relative baseline concept is proposed, in which measured Lamb waves are correlated between different sensor-actuator sets, as opposed to being correlated to pre-stored baseline data, and cross-correlation and power spectral density analysis techniques are performed on data sets recorded from composite and aluminum plates.

TL;DR: This paper presents recent developments in an extremely compact, wireless impedance sensor node for combined use with both impedance method and low-frequency vibrational data acquisition and recently extended the capability of this device by implementing low- frequencies A/D and D/A converters so that the same device can measure low- frequency vibration data.