Simon Nessim Henein

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Three-beam constant-force flexure-based translation stage

Simon Nessim Henein, Florent Cosandier

Flexure-based constant-force mechanisms belong to the category of zero-stiffness mechanisms. They present a non-zero elastic restoring force which does not depend on the deformation of the mechanism. However, their design and modeling are frequently comple ...

2025

Dynamic balancing of a flexure-based Watt's linkage horological oscillator

Simon Nessim Henein, Florent Cosandier, Hubert Pierre-Marie Benoît Schneegans

Mechanical watches are generally regulated by a balance and a spring constituting a harmonic oscillator. This mechanism is intrinsically force-balanced, which makes it essentially insensitive to gravity as well as to the linear accelerations of the watch. ...

Elsevier BV2025

Rectilinear Flexure-based Translation Stage Family with Minimized Parasitic Shift, High Support Stiffness and Large Range of Motion

Simon Nessim Henein, Florent Cosandier, Loïc Benoît Tissot-Daguette, Célestin Vallat

This article presents a novel family of exactly-rectilinear translation mechanisms, called the "QUADRISTAGE family", based on one-degree-of-freedom planar kinematics exclusively using pivot joints and rigid segments. Several variants are presented, some pr ...

Open Engineering Inc2025

Near-Zero Parasitic Shift Rectilinear Flexure Stages Based on Coupled n-RRR Planar Parallel Mechanisms

Simon Nessim Henein, Florent Cosandier

Flexure-based linear stages have become prevalent in precision engineering; however, most designs suffer from parasitic shifts that degrade positioning accuracy. Conventional solutions to mitigate these parasitic motions often compromise support stiffness, ...

MDPI AG2025

Zero-force rectilinear flexure-based translation stage: Experimental validations

Simon Nessim Henein, Florent Cosandier, Loïc Benoît Tissot-Daguette

Compliant mechanisms can advantageously be preloaded by buckled beams in order to reduce their motion stiffness, and therefore also their actuation forces. However, preloading compliant mechanisms has the side-effect of modifying the deformation of their f ...

2025

Residual stress chevron preloading amplifier for large-stroke stiffness reduction of silicon flexure mechanisms

Simon Nessim Henein, Florent Cosandier, Loïc Benoît Tissot-Daguette, Quentin Gubler

Residual stresses can be advantageously used to permanently preload flexure micro-mechanisms in order to modify their deflection and stiffness. This paper presents a new preloading chevron mechanism (PCM) used to amplify the preloading effect of thin film ...

IOP Publishing2025

Near-Zero Parasitic Shift Flexure Pivots Based on Coupled n-RRR Planar Parallel Mechanisms

Simon Nessim Henein, Florent Cosandier, Loïc Benoît Tissot-Daguette, Etienne Frédéric Gabriel Thalmann

Flexure pivots, which are widely used for precision mechanisms, generally have the drawback of presenting parasitic shifts accompanying their rotation. The known solutions for canceling these undesirable parasitic translations usually induce a loss in radi ...

2024

Barefoot Academic Teaching, Performing Arts as a pedagogical tool in Higher Education

Simon Nessim Henein, Ramiro Tau

This book delves into essential, yet often overlooked, aspects of educational and scientifi c practices: the involvement of the body in knowledge acquisition and production, the collective nature of creativity, and the potent role of improvisation in all l ...

Schibri-Verlag2024

Shape memory alloy mechanical actuator with reduced commutation time

Simon Nessim Henein, Charles Baur, Loïc Benoît Tissot-Daguette, Marjan Ghorbani

Using shape memory alloys (SMAs) as actuators offers several advantages, including high power density, large stroke capabilities, and friction elimination. These attributes make SMAs suitable for actuating flexure-based mechanisms in a wide array of extrem ...

2024

Design of a Flexure-Based Flywheel for the Storage of Angular Momentum and Kinetic Energy

Simon Nessim Henein, Florent Cosandier, Hubert Pierre-Marie Benoît Schneegans, Patrick Robert Flückiger

The flywheel is a widespread mechanical component used for the storage of kinetic energy and angular momentum. It typically consists of cylindrical inertia rotating about its axis on rolling bearings, which involves undesired friction, lubrication, and wea ...

2024

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Rectilinear Flexure-based Translation Stage Family with Minimized Parasitic Shift, High Support Stiffness and Large Range of Motion

Simon Nessim Henein, Florent Cosandier, Loïc Benoît Tissot-Daguette, Célestin Vallat

Open Engineering Inc2025