Crimson Publishers-Mechanical Engineering

On Acoustic Properties of Duct Termination Exhausting Hot Flow by Utilizing FEM Simulation by Hans R in Evolutions in Mechanical Engineering_ Element Method Abstract Determination of the acoustical properties for hot flow duct openings is a classical problem in acoustics. The importance of this issue usually becomes apparent when Noise Radiation from engine exhaust systems or burner chimneys is considered. In the paper a Finite Element Method (FEM) simulation has been applied to investigate the effects of high temperature media on the sound propagation through open duct termination. This paper is an extension for the recent experimental work performed by paper authors on acoustical properties of duct terminations exhausting hot gas. In order to simulate the experimental conditions, commercial FEM software COMSOL has been used. The acoustic pressure reflection coefficient of the duct termination is calculated from the complex pressure values simulated at the location of two microphon...

Delay-Induced Synchronization on a Network of Euler’s Beams Indirectly Interconnected Via Piezoelectric Patches by Nana Nbendjo BR* in Evolutions in Mechanical Engineering_ Amplitude Death   Abstract In this paper, Amplitude Death (AD) phenomenon is reported in a network of Euler’s beams in- directly coupled via an electrical circuit consisting of piezoelectric patches. AD phenomenon appears in this system when global synchronization of all beams takes place. The occurrence of global synchronization, which was preceded by dynamical clustering, is dependent on the size of the network as well as on the load resistance of the electrical circuit which indirectly interacts with all the beams. The results further show that the AD state can be observed for relatively very weak coupling strength and large system-size. For more open access journals in  Crimson Publishers  Please click on link:  https://crimsonpublishers.com/ For more Articles on  Amplitude Death ...