Results 61 to 70 of about 1,427,549 (363)

Vibrations

, 2011
Before we can continue to the propagation of sound waves, we have to treat the principles of free and forced vibrations.
Postema, Michiel, Attenborough, Keith
openaire   +3 more sources

Modeling of the Through-the-Thickness Electric Potentials of a Piezoelectric Bimorph Using the Spectral Element Method

Sensors, 2014
An efficient spectral element (SE) with electric potential degrees of freedom (DOF) is proposed to investigate the static electromechanical responses of a piezoelectric bimorph for its actuator and sensor functions.
Xingjian Dong, Zhike Peng, Hongxing Hua, Guang Meng   +3 more
doaj   +1 more source

Influence of Heat Treatment on Microstructure and Mechanical Properties at Elevated Temperatures of Nonweldable Ni‐Based Alloy Printed by Fused Filament Fabrication

Advanced Engineering Materials, EarlyView.
The fused filament‐fabricated MAR‐M247 alloy without hot isostatic pressing shows the lowest porosity of 4%. Heat treatment at 1220 °C produces coarse precipitates and carbides. Specimens heat‐treated at 1220 °C exhibit higher tensile strength (683 MPa) and elongation (10%) at room temperature.
Haneen Daoud, Ying Zheng, Agata Kulig, Natalja Agarkov, Esma Mese, Wolfgang Hofmann, Peter Würtele, Uwe Glatzel   +7 more
wiley   +1 more source

Toughness of Confined Auxetic Foams

Advanced Engineering Materials, EarlyView.
Auxetic (negative Poisson's ratio) materials offer benefits such as impact mitigation, thermal insulation, vibration damping, and reduced shear strain, although their fracture mechanics are largely unexplored. This study investigates damage initiation and propagation in confined re‐entrant auxetic foams from polyurethane via experimental ...
Adrianos E. F. Athanasiadis, Oliver Duncan, Michal K. Budzik, Marcelo A. Dias   +3 more
wiley   +1 more source

Health effects associated with occupational exposure to hand-arm or whole body vibration

Journal of Toxicology and Environmental Health. Part B, Critical Reviews, 2018
Workers in a number of different occupational sectors are exposed to workplace vibration on a daily basis. This exposure may arise through the use of powered-hand tools or hand-transmitted vibration (HTV).
K. Krajnak
semanticscholar   +1 more source

Ag Cluster‐Modified K0.5Na0.5NbO3 Piezocatalyst for Enhanced Electrochemical Dinitrogen Reduction Reaction

Advanced Engineering Materials, EarlyView.
Ag cluster‐modified K0.5Na0.5NbO3 acts as an efficient piezocatalyst for electrochemical N2 reduction, enhanced by built‐in electric fields under mechanical actuation. Comparative studies between static and actuated electrodes reveal improved performance under dynamic conditions.
Benedict Witulski, Naina Goyal, David Patrun, Fabio Pires, Ziyaad Aytuna, Hamed Alaei, Olav Schiemann, Sanjay Mathur   +7 more
wiley   +1 more source

Machines’ Intelligent Fault Diagnosis Based on Hierarchical Refined Composite Generalized Multiscale Fluctuation Dispersion Entropy

Shock and Vibration
Vibration data from mechanical equipment contain extensive information distributed across multiple dimensions. Single-scale analysis fails to comprehensively reflect its damage characteristics, thereby reducing fault diagnosis accuracy.
Biwen Chen, Changsheng Chen, Zhenlai Ma, Guoping Li, Yi Zhang, Baoyue Li   +5 more
doaj   +1 more source

Multistable vibration energy harvesters: Principle, progress, and perspectives

Journal of Sound and Vibration, 2022
Shengxi Zhou, M. Lallart, A. Erturk
semanticscholar   +1 more source

Phase-detection distributed fiber-optic vibration sensor without fading-noise based on time-gated digital OFDR.

Optics Express, 2017
For a distributed fiber-optic vibration sensor (DFVS), the vibration signal extracted from the phase of backscattering has a linear response to the applied vibration, and is more attractive than that from the intensity term.
Dian Chen, Qingwen Liu, Zuyuan He
semanticscholar   +1 more source

Surface Modification of Sol–Gel Synthesized Ba0.85Ca0.15Zr0.1Ti0.9O3 using Stearic Acid Additives

Advanced Engineering Materials, EarlyView.
This study explores a novel approach to enhance the piezoelectric performance of lead‐free BCZT ceramics synthesized via the sol–gel method. By coating the BCZT powder with only a 0.69 nm stearic acid layer, the electromechanical response is significantly boosted up to 359 pC N−1, revealing promising implications for high‐performance sensor and ...
Michelle Weichelt, Maria Rita Cicconi, Isabella Klösel, Swantje Funk, Alexander Martin, Ken‐ichi Kakimoto, Tobias Fey   +6 more
wiley   +1 more source