This tutorial will explain the pumping system speed of sound concept (how to account for acoustic velocity changes due to pipe wall flexibility and liquid properties), the definition of quarter-wave, half-wave, and higher order acoustic mode shapes, the importance of each mode shape, and examples of how to estimate these mode shapes and frequencies. The use of basic acoustics to identify and re...

This paper presents a new Gibbs sampling based approach for Bayesian model updating of a linear dynamic system based on modal data (natural frequencies and partial mode shapes of some of the dominant modes) obtained from a structure using multiple setups. Modal data from multiple setups pose a problem as mode shapes identified from multiple setups are normalized individually and the scaling fac...

This paper investigates the optimal design of 3D printed energy harvesters for railway bridges. The type harvester studied is a cantilever bimorph beam with mass at tip and load resistance. These parameters are adjusted to find that tunes fundamental frequency bridge. An analytical model based on variational formulation represent electromechanical behaviour device presented. optimisation proble...

Modular steel bridges are structures whose construction is based on regular prefabricated truss units. This presents several advantages, such as rapid and easy deployment, high adaptability to the terrain reduced costs. However, they generally face operational restrictions for span lengths greater than 60m. Recent technological innovations search overcome these limitations develop modular with ...

Recently, a variety of wireless structural health monitoring systems have been demonstrated as viable substitutes for traditional high-cost tethered monitoring systems. In this study, a prototype wireless sensing system is deployed upon the Voigt Bridge (La Jolla, CA) to validate its performance against a cabled monitoring system. Using 20 wireless sensors deployed over two spans of the bridge ...

We study the coupled problem of a liquid bridge connected to a porous surface and an impermeable surface, where the gap between the surfaces is an externally controlled function of time. The relative motion between the surfaces influences the pressure distribution and geometry of the liquid bridge, thus affecting the shape of liquid penetration into the porous material. Utilizing the lubricatio...