Results 41 to 50 of about 41,109 (223)

High Frequency Longitudinal Damped Vibrations of a Cylindrical Ultrasonic Transducer

Shock and Vibration, 2014
Ultrasonic piezoelectric transducers used in classical nondestructive testing are producing in general longitudinal vibrations in the MHz range.
Mihai Valentin Predoi, Cristian Cătălin Petre, Ovidiu Vasile, Mihail Boiangiu   +3 more
doaj   +1 more source

NON-RIGID KINEMATIC EXCITATION FOR MULTIPLY-SUPPORTED SYSTEM WITH HOMOGENEOUS DAMPING

International Journal for Computational Civil and Structural Engineering, 2018
This paper continues the discussion of linear equations of motion. The author considers non-rigid kinematic excitation for multiply-supported system leading to the deformations in quasi-static response. It turns out that in the equation of motion written
Alexander G. Tyapin
doaj   +1 more source

Historical seismograms for unravelling a mysterious earthquake: The 1907 Sumatra Earthquake [PDF]

, 2010
History of instrumental seismology is short. Seismograms are available only for a little more than 100 years; high-quality seismograms are available only for the last 50 years and the seismological database is very limited in time. To extend the database,
Kanamori, Hiroo, Lee, William H. K., Rivera, Luis   +2 more
core   +2 more sources

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Investigating the relationship between simulation parameters and flow variables in simulating atmospheric gravity waves for wind energy applications [PDF]

Wind Energy Science
Wind farms, particularly offshore clusters, are becoming larger than ever before. Besides influencing the surface wind flow and the inflow for downstream wind farms, large wind farms can trigger atmospheric gravity waves in the inversion layer and the ...
M. A. Khan, D. Allaerts, S. J. Watson, M. J. Churchfield   +3 more
doaj   +1 more source

Master Equation for the Motion of a Polarizable Particle in a Multimode Cavity

, 2010
We derive a master equation for the motion of a polarizable particle weakly interacting with one or several strongly pumped cavity modes. We focus here on massive particles with complex internal structure such as large molecules and clusters, for which ...
Arimondo E, Aspelmeyer M, Boyd G D, Cohen-Tannoudji C, Domokos P, Dresselhaus M S, Gardiner C W, Helmut Ritsch, Hodgson N, Jaehne K, Klemens Hammerer, Knight P L, Kreibig U, Markus Arndt, Miffre A, Nagy D, Palik E D, Peter Asenbaum, Puri R R, Risken H, Romero-Isart O, Salzburger T, Schulze R J Genes C Ritsch H, Smirnov B M, Stefan Nimmrichter, Walls D F   +25 more
core   +1 more source

All‐in‐One Underwater Quality Evaluation Metamaterial With Mechanical Robustness, Sound Attenuation, and Diffuse Reflection

Advanced Science, EarlyView.
In this work, a bioinspired all‐in‐one underwater quality evaluation metamaterial, combining sound attenuation, diffuse reflection, and mechanical robustness, is proposed based on jumping spider locomotion and human skeletal biomechanics. Meanwhile, a CNN‑driven quality evaluation framework is established for theoretically dimension‐reduced ...
Hongze Li, Zhenyu Li, Jinshui Yang, Jianhao Wu, Yidan Chen, Linzhi Wu, Hong Hu, Penglin Gao, Yegao Qu   +8 more
wiley   +1 more source

Fundamental study of damping models with enhanced frequency independence in nonlinear seismic response analysis

Japan Architectural Review
Causal hysteretic damping, extended Rayleigh damping, and uniform damping models exhibit frequency‐independent damping ratios over a wide frequency range.
Akira Ota, Naohiro Nakamura, Kunihiko Nabeshima, Yoshihiro Mogi, Masafumi Kawabata   +4 more
doaj   +1 more source

INFLUENCE OF MATERIAL DAMPING ON THE RESPONSE OF UNDERGROUND STRUCTURES SUBJECTED TO EARTHQUAKE

Acta Polytechnica CTU Proceedings, 2020
The paper describes a finite element simulation of the response of a real underground structure subjected to earthquake using GEO5 FEM program. It concentrates on the influence of material damping with respect to a specific type of boundary condition ...
Veronika Pavelcová, Tereza Poklopová, Michal Šejnoha, Tomáš Janda   +3 more
doaj   +1 more source

Rayleigh Damping in the Free Troposphere

Journal of the Atmospheric Sciences, 2014
Abstract This paper explores whether cumulus drag (i.e., the damping of winds by convective momentum transport) can be described by an effective Rayleigh drag (i.e., the damping of winds on a constant time scale). Analytical expressions are derived for the damping time scale and descent speed of wind profiles as caused by unorganized ...
openaire   +1 more source