Concept
Ressort de torsion
Publications associées (53)
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Sustainable development has emerged as a paramount consideration in various fields of industry, including construction, to preserve the environment and its finite resources. Lightweight structures, such as fiber-polymer composite structures, address both s ...
EPFL2023Learning Dynamics of Spring-Mass Models with Physics-Informed Graph Neural Networks
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We propose a physics-informed message-passing graph neural network (GNN) for learning the dynamics of springmass systems. The proposed method embeds the underlying physics directly into the message-passing scheme of the GNN. We compare the new scheme with ...
Research Publishing20233D printed fiber-optic nanomechanical bioprobe
Sandor Kasas, Jiangtao Zhou, Yiping Wang, Yuguang Chen
Ultrasensitive nanomechanical instruments, e.g. atomic force microscopy (AFM), can be used to perform delicate biomechanical measurements and reveal the complex mechanical environment of biological processes. However, these instruments are limited because ...
IOP Publishing Ltd2023Optical measurement method for mechanical time base characterization
Simon Nessim Henein, Etienne Frédéric Gabriel Thalmann
The recent adoption of silicon components by the mechanical watch industry has triggered the search for new time bases to advantageously replace the traditional balance and hairspring oscillator. In particular, flexure-based oscillators manufactured in sil ...
2021Optical rotating torque sensor with nano newton-meter resolution based on a hanging torsion wire
Simon Nessim Henein, Etienne Frédéric Gabriel Thalmann, Billy Nussbaumer
This article presents a novel torque measuring setup working in the nano newton-meter range. The central novelty is a long (1 meter range) thin (diameter of a few tens of micrometers) metallic wire used instead of the relatively stiff torsion zone of the s ...
2021Accurate buoyancy and drag force models to predict particle segregation in vibrofluidized beds
The segregation of large intruders in an agitated granular system is of high practical relevance, yet the accurate modeling of the segregation (lift) force is challenging as a general formulation of a granular equivalent of a buoyancy force remains elusive ...
AMER PHYSICAL SOC2021Flexure Pivot Oscillator With Intrinsically Tuned Isochronism
Simon Nessim Henein, Ilan Vardi, Etienne Frédéric Gabriel Thalmann, Mohammad Hussein Kahrobaiyan
The most important property for accurate mechanical time bases is isochronism: the independence of period from oscillation amplitude. This paper develops a new concept in isochronism adjustment for flexure-based watch oscillators. Flexure pivot oscillators ...
2020Flexure Pivot Oscillators for Mechanical Watches
Etienne Frédéric Gabriel Thalmann
It appears that the concerted efforts of the watchmaking industry are leading towards a limit in mechanical watch accuracy. The general consensus in horology is that the time base's quality factor, a dimensionless number that characterizes the oscillator d ...
EPFL2020Additive manufacturing by template-assisted 3D electrodeposition: Nanocrystalline nickel microsprings and microspring arrays
Johann Michler, Laszlo Pethö, Patrik Schürch
In this work, we demonstrate that template-assisted electrodeposition is a viable route for fabricating fully metallic 3D micro-architectures with tailored properties. Firstly, we show that the process can be controlled with the aid of a 3D time-dependent ...
ELSEVIER2020Conceptual design of a rotational mechanical time base with varying inertia
Simon Nessim Henein, Etienne Frédéric Gabriel Thalmann
Flexure pivot oscillators have the potential to advantageously replace the traditional balance wheel-spiral spring oscillator used in mechanical watches due to their significantly lower friction. However, they have inherent nonlinear elastic properties tha ...
2019