Results 91 to 100 of about 4,342 (233)
Laser &Photonics Reviews, EarlyView.An etchless lithium niobate (LN) metasurface with a slanted periodic TiO2 grating enables efficient and narrowband second‐harmonic generation (SHG) thanks to the light confinement in the LN film granted by quasi‐bound‐state‐in‐the‐continuum (q‐BIC) modes.
Yaping Hou +10 more
wiley +1 more source
Vibration Attenuation of Cantilever Beam Using Electromagnetic Delayed Feedback
International Journal of Mechanical System Dynamics, EarlyView.ABSTRACT This study presents a combined analytical and numerical investigation of a single‐input single‐output delayed feedback controller designed to suppress vibrations in a cantilever beam actuated by an electromagnet positioned beneath its free end. An analytical model was developed using the linearized equation of motion for a transversely excited
Mohammad Alabdullah, Khaled Alhazza
wiley +1 more source
Free Material Optimization with Fundamental Eigenfrequency Constraints
, 2009 The goal of this paper is to formulate and solve free material optimization problems with constraints on the smallest eigenfrequency of the optimal structure.
Leugering, G +2 more
core +1 more source
Near‐resonant excitation of the Adriatic barotropic modes: The seiche events of December 2019
Quarterly Journal of the Royal Meteorological Society, EarlyView.This study examines severe flooding in the northern Adriatic Sea in December 2019, which existing forecasting systems failed to predict. Analysis of wind and sea‐level data, alongside reanalysis datasets and a high‐resolution hydrodynamic model, revealed a wind‐induced resonance mechanism.
Marco Bajo +3 more
wiley +1 more source
Structural Symmetry, Multiplicity, and Differentiability of Eigenfrequencies
CoRRThis work investigates the multiplicity and differentiability of eigenfrequencies in structures with various symmetries. In particular, the study explores how the geometric and design variable symmetries affect the distribution of eigenvalues, distinguishing between simple and multiple eigenvalues in 3-D trusses.
Shiyao Sun, Kapil Khandelwal
openaire +2 more sources
Nonlinear Response‐History Analyses of Masonry and Mixed Structures With HybriDFEM
Earthquake Engineering &Structural Dynamics, Volume 55, Issue 8, Page 1694-1709, 10 July 2026.ABSTRACT The hybrid discrete‐finite element (HybriDFEM) method, previously developed to perform static and modal analysis in discrete and coupled discrete‐finite element models, is extended to nonlinear response‐history analyses. The equations of motion for the HybriDFEM model are solved through various numerical time‐integration schemes, both explicit
Igor Bouckaert +2 more
wiley +1 more source
Eigenfrequency loci crossings, veerings and mode splittings of overhanged cantilevers
, 2019 Eigenfrequency loci veering, which indicates strong mode coupling and sometimes mode localization, is a much sought-after property in the applications of mass sensing and opto/electromechanics.
Liu Y, 张吟
core
Strong Mode Coupling and Maximum Directional Absorption in Reciprocal Bianisotropic Metasurfaces
Nanophotonics, Volume 15, Issue 12, 25 June 2026.Symmetry breaking in q‐BIC dielectric metasurfaces enables strong electromagnetic coupling between electric and magnetic modes, leading to their hybridization and Rabi‐like splitting. This mechanism produces pronounced reciprocal bianisotropy and dual‐band asymmetric absorption under opposite illumination directions, offering a compact framework for ...
L. M. Máñez‐Espina +3 more
wiley +1 more source
Performance optimization of large stroke flexure hinges for high stiffness and eigenfrequency [PDF]
, 2013 Two flexure hinge types are optimized for high support stiffness and high first unwanted eigenfrequency for two different working ranges, ±5.7° and ±20°. We show how multiple performance specifications lead to different designs with different performance.
Brouwer, Dannis Michel +3 more
core
Investigation of critical frequencies of the centrifugal compressor rotor with taking into account stiffness of bearings and seals [PDF]
Журнал інженерних наук, 2017 In this paper the implementation of the mathematical model for rotor free oscillations of centrifugal machines is considered with the use of the computer program “Critical frequencies of the rotor”.
I. V. Pavlenko +4 more
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