Concept

Torsional vibration

Publications associées (69)

Local activation of surface and hybrid acoustic waves in optical microwires

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Desmond Chow Ming Chia

Elastic vibrations in subwavelength structures have gained importance recently in fundamental light–matter studies and various optoacoustic applications. Existing techniques have revealed the presence of distinct acoustic resonances inside silica microwire ...

2018

Research on modal vibration suppression of maglev steel strip based on phase compensator

Yuanping Xu

In the process of vibration suppression of hot galvanized steel strip by using maglev technology, the flexible modal vibration control of steel strip is a challenging problem. Aiming at this problem, this paper proposes a phase compensation control algorit ...

2018

Transient study of a very-high-speed rotor through vibration modes

After a quick literature review of rotordynamics, bearing dynamics and rotor vibrations during acceleration, the rotor of a slotless permanent magnet synchronous motor is being studied through simulations. In a first modal analysis, the critical speeds of ...

2018

Bridge natural frequency estimation by extracting the common vibration component from the responses of two vehicles

Arka Prabhata Reksowardojo

Bridge natural frequencies are among fundamental properties of bridges. However, natural frequencies of most bridges remain unknown. Natural frequency identification through acceleration measurement with sensors installed on bridges is not practical if a l ...

Elsevier2017

Effects of chordwise flexibility on 2D flapping foils used as an energy extraction device

Guillaume Jeanmonod

The effects of chordwise pressure- and inertia-driven deformations on the power extraction potential of a kinematically constrained oscillating thin plate that undergoes a heaving and pitching motion are investigated. 2D fully coupled fluid-structure inter ...

Academic Press Ltd- Elsevier Science Ltd2017

Body vibration and its transmission in alpine ski racing

Kamiar Aminian, Benedikt Fasel

The aim of the study was to quantify the vibrations occurring at the lower limbs and the trunk during alpine ski racing. Four European Cup level athletes skied each three runs on a typical giant slalom course. For each turn, power spectral density (PSD) of ...

2016

Stabilization of electrodynamic bearings with active magnetic dampers

Qingwen Cui

Electrodynamic Bearings (EDBs) are a kind of passive magnetic bearings that exploits the interaction between the induced eddy currents in a conductor and a magnetic field to provide re-storing forces. They have been regarded as an appealing alternative to ...

EPFL2016

Gravity insensitive flexure pivots for watch oscillators

Simon Nessim Henein, Ilan Vardi, Lennart Rubbert, Mohammad Hussein Kahrobaiyan

Classical pivots have frictional losses leading to the limited quality factor of oscillators used as time bases in mechanical watches. Flexure pivots address these issues by greatly reducing friction. However, they have drawbacks such as gravity sensitivit ...

2016

Experimental mode shape determination of a cantilevered hydrofoil under different flow conditions

Mohamed Farhat, Eduard Egusquiza

The first three mode shapes of a cantilevered NACA0009 hydrofoil were experimentally investigated in air and under different flow conditions in a cavitation tunnel. First and second bending modes and first torsion mode were determined in resonance conditio ...

Professional Engineering Publishing2016

Design of a high-bandwidth tripod scanner for high speed atomic force microscopy

Georg Fantner, Nahid Hosseini, Maja Dukic Pjanic, Chen Yang, Jie Zhao

Tip-scanning high-speed atomic force microscopes (HS-AFMs) have several advantages over their sample-scanning counterparts. Firstly, they can be used on samples of almost arbitrary size since the high imaging bandwidth of the system is immune to the added ...

2016

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