Results 31 to 40 of about 1,070,708 (345)

A Dumbbell Shaped Piezoelectric Motor Driven by the First-Order Torsional and the First-Order Flexural Vibrations

Actuators, 2020
A piezoelectric motor driven by the first-order torsional and first-order flexural (T/F) vibrations is designed, fabricated, and tested in this study. The actuating force is generated by the torsional vibration of the dumbbell-shaped vibrator, while the ...
Jianye Niu, Jiang Wu, Qiming Liu, Li Chen, Shijie Guo   +4 more
doaj   +1 more source

Mitigation of Torsional Vibrations in Drilling Systems: A Robust Control Approach

IEEE Transactions on Control Systems Technology, 2019
Stick-slip vibrations decrease the performance, reliability, and fail safety of drilling systems. The aim of this paper is to design a robust output-feedback control approach to eliminate torsional stick-slip vibrations in drilling systems.
T. Vromen, C. Dai, N. van de Wouw, T. Oomen, P. Astrid, A. Doris, H. Nijmeijer   +6 more
semanticscholar   +1 more source

Vibration measurement for crack and rub detection in rotors

Metrology and Measurement Systems, 2020
Shaft-stator rub and cracks on rotors, which have devastating effects on the industrial equipment, cause nonlinear and in some cases chaotic lateral vibrations.
Hajnayeb Ali, Shirazi Kourosh Heidari, Aghaamiri Reza   +2 more
doaj   +1 more source

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, Bank, Bank, Chandra, Cortinez, Dancila, Gjelsvik, Jaehong Lee, Jones, Kollar, Lee, Librescu, Librescu, Machado, Mitra, Namshik Ahn, Piovan, Qin, Rand, Shadmehri, Song, Thuc Phuong Vo, Timoshenko, Vlasov, Vo, Vo, Vo, Weaver   +27 more
core   +2 more sources

Counter torque control of torsional vibration suppression device using permanent magnets

Nihon Kikai Gakkai ronbunshu, 2022
A periodic reversal spring (PRS) with permanent magnets is proposed to suppress the torsional vibration of automobile powertrains. Results of numerical dynamic simulations pertaining to automobile powertrains from a previous study show that the magnetic ...
Tomohiro MIYABE, Norio YONEZAWA, Masafumi NANBA, Yasumitsu OSADA   +3 more
doaj   +1 more source

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
doaj   +1 more source

Bifurcation Analysis of a Coupled Nose Landing Gear-Fuselage System [PDF]

, 2014
Under certain conditions during takeoff and landing, pilots may sometimes experience vibrations in the cockpit. Because the cockpit is located right above the nose landing gear, which is known to potentially be prone to self-excited vibrations at certain
Krauskopf, Bernd, Lowenberg, Mark H, Neild, Simon A, Terkovics, Nandor   +3 more
core   +2 more sources

Torsional Vibration Mitigation in Wind Turbines Using BESS in a Microgrid

IEEE Open Access Journal of Power and Energy
The 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
doaj   +1 more source

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, Juan M. Guerrero, Iban Vicente-Makazaga, Iker Muniategui-Aspiazu, Aitor Endemano-Isasi, Fernando Briz   +5 more
doaj   +1 more source

A New Efficient Adaptive Control of Torsional Vibrations Induced by Switched Nonlinear Disturbances

International Journal of Applied Mathematics and Computer Sciences, 2019
Torsional vibrations induced in drilling systems are detrimental to the condition of the machine and to the effectiveness of the engineering process. The cause of vibrations is a nonlinear and unknown friction between a drill string and the environment ...
M. Wasilewski, D. Pisarski, R. Konowrocki, C. Bajer   +3 more
semanticscholar   +1 more source