Publications associées à Machine de Hebern

Experimental Investigation of Enhanced Grooves for Herringbone Grooved Journal Bearings

Jürg Alexander Schiffmann, Patrick Hubert Wagner, Philipp Kaspar Bättig

This paper presents the results of a theoretical and experimental investigation of the potential of enhanced groove geometries to increase the bearing clearance of a Herringbone Grooved Journal Bearing (HGJB) supported rotor. The theoretical study investig ...

2022

Nonlinear study on a rigid rotor supported by herringbone grooved gas bearings: Theory and validation

Jürg Alexander Schiffmann, Patrick Hubert Wagner, Philipp Kaspar Bättig, Wanhui Liu

The nonlinear behavior of a rigid rotor supported by herringbone grooved journal gas bearings (HGJBs) was investigated in this study. The two-dimensional narrow groove theory (2D-NGT) was adopted to model the HGJBs. A set of integrated rotor-bearing state ...

2021

Rotor Position Estimation with Hall-Effect Sensors in Bearingless Drives

Yves Perriard, Juan Patricio Tomás Peralta Fierro

The estimation of rotor position is fundamental for the commissioning of magnetically-levitated drives. The sensors required for this measurement must be close to the rotor, often requiring constructive measures that may limit the application potential of ...

IEEE2020

Integrated, Eddy-Current-Based Sensing of Rotor Position for Magnetic Levitation

Yves Perriard, Sean Thomas, Juan Patricio Tomás Peralta Fierro

Magnetically-levitated drives are compelling in applications where long-lifetime operation or process chamber encapsulation is a requirement. To exploit these advantages, contactless position sensors are needed for position information of the rotor. Off-th ...

IEEE2020

Spatially Sampled Pressure Profile Measurements in Externally Pressurized Gas Journal Bearings

Jürg Alexander Schiffmann, Eliott Philippe Guenat, Karim Magdi Zakaria Abdelrahman Shalash

Externally pressurized gas journal bearings (EPGJB) are widely adopted to support high speed rotors. This paper presents novel experimental benchmark test data which enables EPGJB model validation. Axial and circumferential pressure profile measurements ar ...

2018

Closed-loop magnetic bearing and angular velocity control of a reaction sphere actuator

Yves Perriard, Leopoldo Rossini

This article presents the first closed-loop magnetic bearing and angular velocity experimental results of a reaction sphere actuator for satellite attitude control. The proposed reaction sphere is a permanent magnet spherical actuator whose rotor is suppor ...

Pergamon-Elsevier Science Ltd2015

Procédé pour spectroscopie RMN d'échantillons solides

Geoffrey Bodenhausen, Simone Ulzega, Marc Anthony Caporini

A method for performing magnetic resonance spectroscopy on solid sample containing nuclei of interest with spin quantum number I, comprising: subjecting the sample to a static magnetic field, spinning the sample at the magic angle and broad-band excitation ...

2013

Uniform broadband excitation of crystallites in rotating solids using interleaved sequences of delays alternating with nutation

Geoffrey Bodenhausen, Simone Ulzega, Marc Anthony Caporini

In solids that are spinning about the magic angle, trains of short pulses in the manner of Delays Alternating with Nutations for Tailored Excitation (DANTE) allow one to improve the efficiency of the excitation of magnetization compared to rectangular puls ...

Elsevier2012

Broadband excitation and indirect detection of nitrogen-14 in rotating solids using Delays Alternating with Nutation (DANTE)

Geoffrey Bodenhausen, Simone Ulzega, Marc Anthony Caporini

A train of short rotor-synchronized pulses in the manner of Delays Alternating with Nutations for Tailored Excitation (DANTE) applied to nitrogen-14 nuclei (I = 1) in samples spinning at the magic angle at high frequencies (typically nu(rot) = 62.5 kHz so ...

Elsevier2011

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Machine de Hebern

Experimental Investigation of Enhanced Grooves for Herringbone Grooved Journal Bearings

Nonlinear study on a rigid rotor supported by herringbone grooved gas bearings: Theory and validation

Rotor Position Estimation with Hall-Effect Sensors in Bearingless Drives

Integrated, Eddy-Current-Based Sensing of Rotor Position for Magnetic Levitation

Spatially Sampled Pressure Profile Measurements in Externally Pressurized Gas Journal Bearings

Engineering & Performance of DuoTurbo: Microturbine with Counter-Rotating Runners

Closed-loop magnetic bearing and angular velocity control of a reaction sphere actuator

Procédé pour spectroscopie RMN d'échantillons solides

Uniform broadband excitation of crystallites in rotating solids using interleaved sequences of delays alternating with nutation

Broadband excitation and indirect detection of nitrogen-14 in rotating solids using Delays Alternating with Nutation (DANTE)

Graph Chatbot

Chattez avec Graph Search

Integrated, Eddy-Current-Based Sensing of Rotor Position for Magnetic Levitation

Broadband excitation and indirect detection of nitrogen-14 in rotating solids using Delays Alternating with Nutation (DANTE)

Engineering & Performance of DuoTurbo: Microturbine with Counter-Rotating Runners

Procédé pour spectroscopie RMN d'échantillons solides

Uniform broadband excitation of crystallites in rotating solids using interleaved sequences of delays alternating with nutation

Experimental Investigation of Enhanced Grooves for Herringbone Grooved Journal Bearings

Nonlinear study on a rigid rotor supported by herringbone grooved gas bearings: Theory and validation

Rotor Position Estimation with Hall-Effect Sensors in Bearingless Drives

Closed-loop magnetic bearing and angular velocity control of a reaction sphere actuator

Spatially Sampled Pressure Profile Measurements in Externally Pressurized Gas Journal Bearings