Abstract Noise is an environmental pollutant with recognized impacts on the psychological and physiological health of humans. Many porous materials are often limited by low sound absorption over a broad frequency range, delicacy, excessive weight thickness, poor moisture insulation, high temperature instability, lack readiness for volume commercialization. Herein, efficient robust lamella‐structure reported as acoustic absorber based self‐assembled interconnected graphene oxide (GO) sheets...

A recently-published equation for calculating the force between coaxial cylindrical magnets is presented in simplified form. The revised now very compact: it defined with fewer parameters and contains terms than original equation. new purely real, unlike which contained imaginary components. As a result of simplifications, demonstrably faster to evaluate original, improving its utility parametric optimization. reference implementation provided Matlab Mathematica.

In this paper we investigate twelve multi-directional/topological wall shear stress (WSS) derived metrics and their relationships with the formation of coronary plaques in both computational fluid dynamics (CFD) dynamic fluid-structure interaction (FSI) frameworks. While low WSS is one most established biomechanical markers associated atherosclerosis progression, alone it limited. Multi-directional topological have been shown to be important related mechanotransduction near-wall transport...

An experiment was performed to investigate the implementation of shaped PVDF modal sensors on a simply supported rectangular plate control specific modes vibration. The excited by steady-state harmonic point force while achieved two independent piezoelectric actuators bonded surface plate. A two-channel adaptive controller based multi-input multi-output filtered X LMS algorithm used provide feed-forward control. Two were such that (3,1) mode dominant structural observed sensors. With this...

In this paper, a variety of analytical/integral methods are compared for calculating the axial force between cylindrical magnet and "thick" solenoid that consists many turns both radially axially. Two newly developed techniques introduced: one being numerical integration-based other completely analytical. These to two techniques, each shown have various advantages in different contexts. One method particular is introduced be most computationally efficient majority actuator designs. This then...

In this study, the effect of shape stenosis on flow transition in an artery is investigated. Different shapes including round, oval, elongated, half-moon, bean-shape, and crescent with without eccentricity at a constant degree (73%) are studied. A computational model, validated against in-house Particle Image Velocimetry experimental results, used to investigate behavior. The results showed that length jet region after stenotic section varies significantly for different stenosis. Based...

The turbulence in the blood flow, caused by plaque deposition on arterial wall, increases combined effect of complex geometries and pulsatile flow. correlation between geometry, inlet flow induced a constricted artery is investigated this study. Pressure drop, velocity wall shear stress are determined for stenosed coronary models with three different degrees asymmetric stenosis heart working conditions. A Computational Fluid Dynamics model, validated against experimental data published...

Magnetic bearings use magnetic forces to support various machine components. Because of the non-contact nature this type suspension, bearing technology offers a number significant advantages over conventional bearings, such as rolling element and fluid film bearings. An active basically consists an electromagnetic actuator, position sensors, power amplifiers, feedback controller. All these components are characterized by nonlinear behavior therefore entire system is inherently nonlinear....

Local active noise control systems generate a zone of quiet at the physical error sensor using one or more secondary sources to cancel acoustic pressure and its spatial derivatives location. The resulting is generally limited in size as such, placement location desired attenuation required, which often inconvenient. Virtual sensors overcome this by projecting away from remote work described here investigates effectiveness virtual pure tone diffuse sound field. Stochastically optimal...

In the present study, optimal two-dimensional (2D) tripping technique for inducing a naturally fully developed turbulent boundary layer in wind tunnels has been investigated. Various techniques were tested, including wires of different diameters and changes roughness. Experimental measurements taken on flat plate tunnel at number locations along variety flow speeds using hot-wire anemometry to measure resulting from each method. The results have demonstrated that produce natural 2D...

Non-invasive measurement of pressure drop has great clinical significance for the treatment coronary artery diseases. The objective this study is to develop a relationship that can estimate in stenosed model as function different parameters such blood viscosity, length and diameter, flow rate profile, shape degrees stenosis. Experimental measurements from wide range stenosis critical simplified geometries along with unsteady profiles are employed evaluate equation. To calculate blockage term...

Abdominal aortic aneurysm (AAA) is a pathological condition characterised by localised dilation of the infrarenal aorta, which can be fatal if rupture occurs. Current diagnostic criteria for repair are not patient-specific, but computational modelling may help to predict potential growth and risk AAA accurately. This paper highlights how important using Windkessel effect fully-developed inflow velocity framework biomechanical analysis is; in other words, this research investigates different...