Experimental study and numerical modeling of vibrational characteristics of a 500W PEM fuel cell stack [PDF]
Hydrogen, Fuel Cell & Energy Storage, 2022 A PEM fuel cell is considered a system with a complex mechanical structure due to a large number of components with different dimensions and materials. Understanding this structure is essential to design fuel cells against dynamic loads such as shock and
mohammad Mohammadi* +2 more
doaj +1 more source
Investigation Into the Galloping Characteristics of Multispan Iced Covered Conductors
IEEE Access, 2022 A full multispan two-degree-of-freedom (2-DOF) iced covered transmission line model is presented. Taking multispan conductors as the research object, based on the Hamiltonian principle, a nonlinear galloping model of multispan conductors considering the ...
Jia-Yan Zheng +2 more
doaj +1 more source
A characteristic frequency of two mutually interacting gas bubbles in an acoustic field [PDF]
, 2001 Transition frequencies of two spherical gas bubbles interacting in an acoustic field are discussed theoretically. In the present study, transition frequency is defined as the frequency of external sound for which the phase difference between a bubble's ...
Alvarez +27 more
core +2 more sources
Natural Frequencies of Human Corticothalamic Circuits [PDF]
Journal of Neuroscience, 2009 The frequency tuning of a system can be directly determined by perturbing it and by observing the rate of the ensuing oscillations, the so called natural frequency. This approach is used, for example, in physics, in geology, and also when one tunes a musical instrument. In the present study, we employ transcranial magnetic stimulation (TMS) to directly
M. Rosanova +5 more
openaire +2 more sources
Natural frequency analysis of cracked beam
Vietnam Journal of Mechanics, 1997 The model of cracked one-dimensional structure has been treated as two uniform beams connected by an equivalent rotation spring at the crack location.
Nguyen Tien Khiem, Dao Nhu Mai
doaj +1 more source
Buildings, 2021 Historic buildings have a high architectural value and their maintenance, repair and rehabilitation require a special approach. This approach is mainly based on the buildings’ performance under non-destructive tests such as operational modal analysis ...
Suzana Ereiz +3 more
doaj +1 more source
Collective frequency variation in network synchronization and reverse PageRank [PDF]
, 2016 A wide range of natural and engineered phenomena rely on large networks of interacting units to reach a dynamical consensus state where the system collectively operates.
Arenas, Alex +3 more
core +4 more sources
Evaluation of sand p–y curves by predicting both monopile lateral response and OWT natural frequency
Studia Geotechnica et Mechanica, 2022 Extending the use of the p–y curves included in the regulation codes API and DNV to design large-diameter monopiles supporting offshore wind turbines (OWTs) was unsuccessful as it resulted in an inaccurate estimation of the monopile behavior.
Amel Douifi +3 more
doaj +1 more source
Frequency shifts in natural vibrations in pantographic metamaterials under biaxial tests [PDF]
, 2017 In this paper a 2D continuum model, thought as the homogenized limit of a microstructured pantographic sheet, is studied. The microstructure is characterized by two families of parallel fibers, whose deformation measures account for bending, elongation ...
Battista, Antonio +3 more
core +1 more source
Photonic superdiffusive motion in resonance line radiation trapping - partial frequency redistribution effects [PDF]
, 2007 The relation between the jump length probability distribution function and the spectral line profile in resonance atomic radiation trapping is considered for Partial Frequency Redistribution (PFR) between absorbed and reemitted radiation. The single line
A. R. Alves-Pereira +18 more
core +2 more sources