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Simon Nessim Henein

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Related publications (103)

Theory and design of spherical oscillator mechanisms

Simon Nessim Henein, Nicolas Ferrier, Roland Andreas Bitterli, Billy Nussbaumer, Mohammad Hussein Kahrobaiyan, Ilan Vardi, Lennart Rubbert

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 ...

2018

Flexure-Pivot Oscillator Restoring Torque Nonlinearity and Isochronism Defect

Simon Nessim Henein, Mohammad Hussein Kahrobaiyan, Etienne Frédéric Gabriel Thalmann

Flexure pivot based oscillators can advantageously replace the hairspring and balance wheel, the time base used in mechanical watches, by drastically reducing friction. However, flexure pivots have drawbacks including gravity sensitivity and restoring torq ...

AMER SOC MECHANICAL ENGINEERS2018

Two degree of freedom mechanical oscillator

Simon Nessim Henein, Mohammad Hussein Kahrobaiyan, Ilan Vardi

Mechanical oscillator (10) comprising an inertial body (101) joined to a support (100) by means of an elastic system (102, 103, 104, 105, 106, 107) arranged to provide the inertial body (101) with substantially no degrees of freedom in translation and with ...

2018

Programmable Multistable Mechanisms: Synthesis and Modeling

Simon Nessim Henein, Ilan Vardi, Mohamed Gamal Abdelrahman Ahmed Zanaty

2018

Mechanical oscillator

Simon Nessim Henein, Mohammad Hussein Kahrobaiyan, Ilan Vardi

wherein k1, k3, k5 . . . are constants and θ is an angle of inclination of said third axis (x, P) of said inertial body with respect to a direction of said third axis (xr) when said inertial body is in said resting position. ...

2018

Horloge neuchâteloise du XXIe siècle équipée de l’oscillateur IsoSpring

Simon Nessim Henein, Ilan Vardi

2018

Echappements à impulsion virtuelle

Simon Nessim Henein, Roland Andreas Bitterli, Etienne Frédéric Gabriel Thalmann, Ilan Vardi, Laura Marie Lucie Convert

L’échappement à détente est reconnu pour sa performance chronométrique, mais il n’est pas sécurisé pour la montre-bracelet. Plusieurs échappements ont été proposés pour adapter cet échappement à la montre, dont l’échappement Robin récemment sécurisé par Au ...

2018

Programmable Constant-Force Multistable Mechanisms

Simon Nessim Henein, Mohamed Gamal Abdelrahman Ahmed Zanaty

Programmable multistable mechanisms exhibit stability behavior whereby the stiffness and the number of stable states can be controlled via programming inputs. In this paper, we report the zero stiffness behavior of a 2-degree of programming (DOP) T-combine ...

AMER SOC MECHANICAL ENGINEERS2018

Device for controlled puncturing of an object

Simon Nessim Henein, Charles Baur, Mohamed Gamal Abdelrahman Ahmed Zanaty

The present invention relates to a device (1) for puncturing an object, in particular a bodily vein (V), comprising: - a body (2) defining an inner cavity (3) with at least one opening (31) and - a perforating needle (4) extending in said cavity (3) and be ...

2018

Experimental Characterization of a T-Shaped Programmable Multistable Mechanism

Simon Nessim Henein, Mohamed Gamal Abdelrahman Ahmed Zanaty

Programmable multistable mechanisms (PMM) exhibit a modifiable stability behavior in which the number of stable states, stiffness, and reaction force characteristics are controlled via their programming inputs. In this paper, we present experimental charac ...

2018

Gravity-Insensitive Flexure Pivot Oscillators

Simon Nessim Henein, Mohammad Hussein Kahrobaiyan, Etienne Frédéric Gabriel Thalmann, Ilan Vardi, Lennart Rubbert

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 ...

2018

Système multistable programmable

Simon Nessim Henein, Mohamed Gamal Abdelrahman Ahmed Zanaty

Système multistable comprenant un premier organe élastique (1) de rang r=1 comprenant des première (2) et deuxième (3) extrémités et une zone de liaison (4) entre les première (2) et deuxième (3) extrémités, et (n-1) autres organes élastiques (10, 100) de ...

2018

Une horloge mécanique sans tic-tac

Simon Nessim Henein, Ilan Vardi

Le mécanisme à échappement des montres mécaniques, utilisé depuis la Renaissance, devient-il obsolète ? Un nouveau principe d'oscillateur promet des mouvements horlogers plus efficaces. Et plus silencieux... L'essentiel: - Les montres mécaniques sont moins ...

2017

An Analytical Model for Beam Flexure Modules Based on Timoshenko Beam Theory

Simon Nessim Henein, Mohammad Hussein Kahrobaiyan, Mohamed Gamal Abdelrahman Ahmed Zanaty

Short beams are the key building blocks in many compliant mechanisms. Hence, deriving a simple yet accurate model of their elastokinematics is an important issue. Since the Euler-Bernoulli beam theory fails to accurately model these beams, we use the Timos ...

2017

VivoForce instrument for retinal microsurgery

Simon Nessim Henein, Charles Baur, Marine Chantal Elisabeth Geneviève Clogenson, Sebastian Krzysztof Fifanski, José Luis Rivera Gutiérrez

2017

La R&D commune entreprises-université dans l'industrie horlogère de 1900 à nos jours

Simon Nessim Henein, Ilan Vardi

2017

Higher-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 ...

2017

Une horlogerie mécanique sans tic-tac

Simon Nessim Henein, Ilan Vardi

2017

The isostatic 3-body problem: a complete solution

Simon Nessim Henein, François Barrot, Florent Cosandier, Johannes Richard Cornelis Geerit Kruis, Ilan Vardi

Kinematic couplings are used when two rigid bodies need to be repeatedly and accurately positioned with respect to each other. They allow for sub-micron positioning repeatability by suppressing play and reducing strains in the bodies. Typical applications ...

2017

Surgical Anatomy of the Human Round Window Region: Implication for Cochlear Endoscopy Through the External Auditory Canal

Simon Nessim Henein, Demetri Psaltis

Objective: To enable development of an endoscope for cellular-level optical imaging of the inner ear. Study Design: A prospective study of 50 cadaveric human temporal bones to define detailed surgical anatomy of the round window (RW) region and the range o ...

Lippincott, Williams & Wilkins2016

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