Results 11 to 20 of about 792,957 (313)

Wind Speed Spectrum of a Moving Vehicle under Turbulent Crosswinds

open access: yesApplied Sciences, 2023
Wind loads have become one of the key influencing factors for the running safety of vehicles and comfort of passengers. The investigation of the wind speed spectrum characteristics of a moving vehicle under turbulent crosswinds is of great importance ...
Qingsong Duan
doaj   +1 more source

Effect of a Novel Tooth Pitting Model on Mesh Stiffness and Vibration Response of Spur Gears

open access: yesMathematics, 2022
The existence of pitting failure has a direct influence on the time-varying mesh stiffness (TVMS) and thus changes the vibration properties of the gears.
Jingyu Hou   +3 more
doaj   +1 more source

Locating and imaging composite damage based on frequency spectrum detection of lamb waves

open access: yesFrontiers in Physics, 2022
Lamb wave is widely concerned in damage detection of composite structures due to its long propagation distance and strong sensitivity to damage. In order to solve the problem of damage information extraction, high-precision imaging positioning of damage ...
Wenchao Zhang   +3 more
doaj   +1 more source

Measuring the Amount of Mechanical Vibration During Lathe Processing [PDF]

open access: yesTransactions of the VŠB-Technical University of Ostrava, Mechanical Series, 2015
The article provides basic information regarding the measurement and evaluation of mechanical vibration during the processing of material by lathe work. The lathe processing can be characterized as removing material by precisely defined tools.
Štefánia SALOKYOVÁ
doaj   +1 more source

Hawking spectrum and high frequency dispersion [PDF]

open access: yesPhysical Review D, 1996
We study the spectrum of created particles in two-dimensional black hole geometries for a linear, hermitian scalar field satisfying a Lorentz non-invariant field equation with higher spatial derivative terms that are suppressed by powers of a fundamental momentum scale $k_0$. The preferred frame is the ``free-fall frame" of the black hole.
Corley, S., Jacobson, T.
openaire   +3 more sources

Connection Between Damping Torque Analysis and Energy Flow Analysis in Damping Performance Evaluation for Electromechanical Oscillations in Power Systems

open access: yesJournal of Modern Power Systems and Clean Energy, 2022
The damping performance evaluation for electro-mechanical oscillations in power systems is crucial for the stable operation of modern power systems. In this paper, the connection between two commonly-used damping performance evaluation methods, i.e., the
Yong Hu   +4 more
doaj   +1 more source

Alpha peak activity in resting-state EEG is associated with depressive score

open access: yesFrontiers in Neuroscience, 2023
IntroductionDepression is a serious psychiatric disorder characterized by prolonged sadness, loss of interest or pleasure. The dominant alpha peak activity in resting-state EEG is suggested to be an intrinsic neural marker for diagnosis of mental ...
Peng Zhou   +15 more
doaj   +1 more source

Vibration Resonance Spectrometry (VRS) for the Advanced Streaming Detection of Rotor Unbalance

open access: yesMachines, 2023
Determination of the diagnosis thresholds is crucial for the fault diagnosis of industry assets. Rotor machines under different working conditions are especially challenging because of the dynamic torque and speed.
Matthew T. Gerdes   +5 more
doaj   +1 more source

Case depth in SAE 1020 steel using barkhausen noise [PDF]

open access: yesMaterials Research, 2013
The most widely used thermochemical process for surface hardening of steels is case hardening. Using several different heat treatments, martensitic surface layers were formed on SAE 1020 steel into which carbon had been diffused.
Alessandra Drehmer   +2 more
doaj   +3 more sources

Fundamentals for measurement of film thickness adhered on lubricating surface using ultrasonic method

open access: yesNihon Kikai Gakkai ronbunshu, 2023
In order to obtain the fundamental information for the measurement of thin oil film thickness adhered on lubrication surface using ultrasonic method, the ultrasonic calculation considering the scattering attenuation at each interface and the influence of
Akitoshi TAKEUCHI
doaj   +1 more source

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