The influence of the surrounding air on the dynamics of fine granular material is becoming an increasingly topical area of research interest. While for large granular particles (diameter > 1 mm) the effect of the gas phase can usually be ignored, for smaller particles the ambient air can have a pronounced influence. One of the most striking examples of the effect of air was demonstrated in the ...

This paper presents the design and evaluation of a novel permanent magnet (PM) energy harvesting system for scavenging electrical energy from ambient vibrations. A two-phase tubular linear PM vibration energy harvester consisting of a mover attached with permanent magnets and a slotted stator with built-in two-phase electromagnetic coils is proposed to convert vibrational kinetic energy into el...

Q Associates performed a series of tests and benchmarks to determine the effect of data center and system vibration on the I/O performance of an end-to-end compute environment. These tests revealed that ambient vibration inherent in a world-class, raised floor data center caused performance degradation of up to 246% for random reads and up to 88% degradation for random writes for an enterprise ...

Thermo-elastic damping is a significant dissipation mechanism in high quality factor microstructures. In this paper, thermo-elastic damping of the in-plane vibration of fully clamped rectangular micro-plates has been studied. The governing equation of the micro-plate motion and heat conduction equation were derived. Then, The Galerkin method has been used to solve the coupled heat-displacement ...

The importance of energy harvesting is considered when the neglected ambient that graduated from different systems and dissipates around us, such as electromagnetic waves, heat, vibration, etc [...]

Underwater and in-air noise evaluations were completed in performance pool systems at Georgia Aquarium under normal operating conditions and with performance sound tracks playing. Ambient sound pressure levels at in-pool locations, with corresponding vibration measures from life support system (LSS) pumps, were measured in operating configurations, from shut down to full operation. Results indi...

In this paper, we present a room-level building occupancy estimation system (BOES) utilizing low-resolution vibration sensors that are sparsely distributed. Many ubiquitous computing and building maintenance systems require fine-grained occupancy knowledge to enable occupant centric services and optimize space and energy utilization. The sensing infrastructure support for current occupancy esti...

Application of deconvolution interferometry to earthquake data recorded inside a building is a powerful technique for monitoring parameters of the building, such as velocities of traveling waves, frequencies of normal modes, and intrinsic attenuation. In this study, we apply interferometry to ambient-vibration data, instead of using earthquake data, to monitor a building. The time continuity of...