Measurement of Stress Waves Propagation in Percussive Drilling
Sensors, 2021 This work describes the results of a test campaign aimed to measure the propagation of longitudinal, torsional, and flexural stress waves on a drill bit during percussive rock drilling.
Diego Scaccabarozzi, Bortolino Saggin
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Numerical Investigation on Torsional Mode Self-Excited Vibration of Guide Vane in a Reversible Pump-Turbine during Pump Mode’s Starting Up [PDF]
Journal of Applied Fluid Mechanics, 2022 In reversible pump-turbines, guide vane vibrations are considered to have potentially severe consequences of noise and structural damage. Unstable torsional mode self-excited vibrations of guide vanes have been reported at small guide vane openings ...
W. Kang, Q. Liang, L. Zhou, Z. Wang
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On sixfold coupled vibrations of thin-walled composite box beams [PDF]
, 2008 This paper presents a general analytical model for free vibration of thin-walled composite beams with arbitrary laminate stacking sequences and studies the effects of shear deformation over the natural frequencies.
Armanios +27 more
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Torsional Vibration Mitigation in Wind Turbines Using BESS in a Microgrid
IEEE Open Access Journal of Power and EnergyThe paper introduces a damping control scheme utilizing a battery energy storage system (BESS) to mitigate torsional vibrations for wind turbine generators (WTGs) in a microgrid.
Yi-Wei Chen, Yuan-Yih Hsu
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State Dependent Delayed Drill-string Vibration : Theory, Experiments and New Model [PDF]
, 2017 L.J. Pei would like to acknowledge NNSF of China (No.
Kapitaniak, Marcin Tomasz +4 more
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Torsional Vibration Suppression in Railway Traction Drives
IEEE Access, 2022 Torsional vibrations phenomena are self-excited vibrations that occur in the wheelset of railway powertrains due to the counter-phase oscillation of both wheels. Long-lasting events of this type may lead to the catastrophic failures. Therefore, torsional
Ahmed Fathy Abouzeid +5 more
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Development of a torsional vibration suppression device using permanent magnets
Nihon Kikai Gakkai ronbunshu, 2021 Dual mass flywheel (DMF) dampers are conventionally used for torsional vibration suppression in automobile powertrains. The torsional vibration in powertrains has increased in recent years owing to the widespread downsizing of internal combustion engines
Tomohiro MIYABE +3 more
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Radiative activity of magnetic white dwarf undergoing Lorentz-force-driven torsional vibrations
, 2011 We study radiative activity of magnetic white dwarf undergoing torsional vibrations about axis of its own dipole magnetic moment under the action of Lorentz restoring force. It is shown that pulsating white dwarf can convert its vibration energy into the
I. V. MOLODTSOVA +4 more
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Torsions, low-frequency vibrations, and vibration–torsion (“vibtor”) levels in the m-chlorotoluene cation [PDF]
The Journal of Chemical Physics, 2020 Zero-electron-kinetic-energy (ZEKE) spectra are presented for m-chlorotoluene (mClT), employing different low-lying torsional and vibration–torsional (“vibtor”) levels of the S1 state as intermediates. The adiabatic ionization energy is determined to be 71 319 cm−1 ± 5 cm−1 (8.8424 ± 0.0006 eV).
David J. Kemp +2 more
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Breakdown of the mirror image symmetry in the optical absorption/emission spectra of oligo(para-phenylene)s [PDF]
, 2005 The absorption and emission spectra of most luminescent, pi-conjugated, organic molecules are the mirror image of each other. In some cases, however, this symmetry is severely broken.
Andrew C. Grimsdale +9 more
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