Personne
Lennart Rubbert
Cette personne n’est plus à l’EPFL
Publications associées (16)
Flexible surgical device with controllable stiffness
The invention relates to a surgical device (10), comprising a tubular outer shaft (12,) and an inner element (14) having an elongated shape, the outer shaft comprising a distal (30a) and a proximal (30b) outer hinges, the inner element comprising an inner ...
2022Design of a compliant load cell with adjustable stiffness
Charles Baur, Lennart Rubbert, Michal Stanislaw Smreczak
Manipulation at the sub-micron scale often requires force-sensing capabilities of milli-to nanonewton forces. This article presents a novel design of a compliant load cell with mechanically adjustable stiffness. The system enables adapting force sensitivit ...
ELSEVIER SCIENCE INC2021General 2 degree of freedom isotropic harmonic oscillator and associated time base without escapement or with simplified escapement
Simon Nessim Henein, Ilan Vardi, Lennart Rubbert
A mechanical isotropic harmonic oscillator including a frame, a mass configured to oscillate, and three flexure rods, each flexure rod connecting the mass to the frame. ...
2019Theory and design of spherical oscillator mechanisms
Simon Nessim Henein, Roland Andreas Bitterli, Ilan Vardi, Lennart Rubbert, Mohammad Hussein Kahrobaiyan, Nicolas Ferrier, Billy Nussbaumer
In previous work, we showed that two degree of freedom oscillators can be advantageously applied to horological time bases since they can be used to eliminate the escapement mechanism. We subsequently examined planar two degree of freedom oscillators based ...
Elsevier2018Gravity-Insensitive Flexure Pivot Oscillators
Simon Nessim Henein, Ilan Vardi, Etienne Frédéric Gabriel Thalmann, Lennart Rubbert, Mohammad Hussein Kahrobaiyan
Classical mechanical watch plain bearing pivots have frictional losses limiting the quality factor of the hairspring-balance wheel oscillator. Replacement by flexure pivots leads to a drastic reduction in friction and an order of magnitude increase in qual ...
2018Higher-order continuation method for the rigid-body kinematic design of compliant mechanisms
Simon Nessim Henein, Lennart Rubbert
Compliant mechanisms are of great interest in precision engineering. In this paper we propose a higher order continuation method to help their rigid-body kinematic design. The method helps to investigate the choice of a mechanism configuration through the ...
Elsevier2017The Art of Flexure Mechanism Design
Simon Nessim Henein, Florent Cosandier, Lennart Rubbert, Murielle Richard
Flexure mechanism design is an art, and this book provides the theoretical and practical foundation for scientists and engineers to express their creativity in this field. Flexure mechanisms, also known as compliant mechanisms, rely on the elasticity of ma ...
EPFL Press2017Gravity 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 ...
2016XY ISOTROPIC HARMONIC OSCILLATOR AND ASSOCIATED TIME BASE WITHOUT ESCAPEMENT OR WITH SIMPLIFIED ESCAPEMENT
Simon Nessim Henein, Ilan Vardi, Lennart Rubbert
The mechanical isotropic harmonic oscillator comprises at least a two degree of freedom linkage supporting an orbiting mass with respect to a fixed base with springs having isotropic and linear restoring force properties. The oscillator may be used in a ti ...
2015GENERAL 2 DEGREE OF FREEDOM ISOTROPIC HARMONIC OSCILLATOR AND ASSOCIATED TIME BASE WITHOUT ESCAPEMENT OR WITH SIMPLIFIED ESCAPEMENT
Simon Nessim Henein, Ilan Vardi, Lennart Rubbert
The mechanical isotropic harmonic oscillator comprises at least a two degrees of freedom linkage supporting an orbiting mass with respect to a fixed base with springs having isotropic and linear restoring force properties wherein the mass has a tilting mot ...
2015