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Publications associées (18)

3D printed fiber-optic nanomechanical bioprobe

Sandor Kasas, Jiangtao Zhou

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 Ltd2023

Learning Dynamics of Spring-Mass Models with Physics-Informed Graph Neural Networks

Olga Fink, Vinay Sharma

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 Publishing2023

An Inertial Uni-Axial Interferometer-Based Accelerometer for Harsh Environments

Gerard Aliana Cervera

For high-impact devices, subsequent vibrations have as much influence on the deterioration of the mechanical structure as the impact itself. To mitigate the consequences of both impacts and resulting vibrations, it is crucial to accurately understand the p ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2022

Tuning stiffness nonlinearty: theory and applications

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

Perfect elasticity is not achievable in real-life situation, so spring stiffness is not perfectly constant. In this paper, we study the effect of modifying non-linear stiffness terms while keeping the nominal stiffness constant. We introduce three methods ...

ASME2020

Design and Thermal-Structural Analyses of Ancillary Components for the Optical Steering Mirror (M4) for the ITER ECH Upper Launcher

Timothy Goodman, René Chavan, Avelino Mas Sanchez, Matteo Vagnoni, Phillip Miguel Santos Silva

Each of the four ITER Electron Cyclotron Heating Upper Launcher (ECHUL) features eight transmission lines (TLs) that are used to inject 170-GHz microwave power into the plasma at a level of up to 1.31 MW (at the TL diamond window) per line. The millimeter ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2020

Design Analysis of a Shape Memory Alloy Bias-Spring Linear Actuator

Yves Perriard, Morgan Almanza, Sean Thomas

This paper aims to adapt the well established Brinson model for the thermoelastic behaviour of the Shape Memory Effect (SME) so as to compare it to a custom shape memory material modelled using an finite element modelling software. In this work, the Brinso ...

IEEE2019

Gravity-Insensitive Flexure Pivot Oscillators

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

Apparatus for treating excess intraocular fluid

Nikolaos Stergiopoulos, Constantinos Stergiopulos

Apparatus and methods are provided for treating diseases that produce elevated intraocular pressures, such as glaucoma, wherein the device operates on the principles of a Starling resistor, and includes a housing, a deformable structure and a spring mounte ...

2017

Structure of the T4 baseplate and its function in triggering sheath contraction

Henning Paul-Julius Stahlberg, Petr Leiman, Mikhail Shneyder, Ricardo Cesar Guerrero Ferreira, Christopher Browning, Nicholas Michael Ian Taylor

Several systems, including contractile tail bacteriophages, the type VI secretion system and R-type pyocins, use a multiprotein tubular apparatus to attach to and penetrate host cell membranes. This macromolecular machine resembles a stretched, coiled spri ...

Nature Publishing Group2016

Modeling, Characterization and Control of a Novel Torsional Shape Memory Alloy (SMA) Actuator

Jamie Paik, Zhenishbek Zhakypov, Jian-Lin Huang

Thermally activated shape memory alloy (SMA) actuators are direct-driven and produce high power density with design versatility. However, beyond their linear actuation in spring forms there is little variety and their application in robotics is limited by ...

Institute of Electrical and Electronics Engineers2016

Hand Impedance Measurements During Interactive Manual Welding With a Robot

Aude Billard, Mustafa Suphi Erden

This paper presents a study of hand impedance measurements comparatively across ten professional and 14 novice manual welders, when they are performing tungsten inert gas (TIG) welding interactively with the KUKA lightweight robot arm (LWR). The results sh ...

Ieee-Inst Electrical Electronics Engineers Inc2015

In-plane fabrication of insulated gold-tip probes for electrochemical and force spectroscopy molecular experiments

Nico de Rooij, Terunobu Akiyama, Peter Van der Wal, Sebastian Gautsch, Yexian Wu

A new and versatile fabrication process of insulated gold tip probes for atomic force microscopy (AFM) is presented by Wu et al. (In-plane fabricated insulated gold-tip probe for electrochemical and molecular experiments, in: 2013 IEEE 26th International C ...

Elsevier2014

In-Plane Fabricated Insulated Gold-Tip Probe For Electrochemical And Molecular Experiments

Nico de Rooij, Terunobu Akiyama, Peter Van der Wal, Sebastian Gautsch, Yexian Wu

In this contribution we present a scanning probe with a gold-tip completely encapsulated with insulator all the way to the apex. The probe fabrication is unique owing to an in-plane arrangement in which the width of the cantilever is defined by deep reacti ...

IEEE2013

Two-dimensional cantilever array with varying spring constants and tip radii for life-science applications

Nico de Rooij, Terunobu Akiyama, Peter Vettiger, Sebastian Gautsch, Frédéric Loizeau

A fabrication process for realising two-dimensional cantilever arrays for parallel force spectroscopy of biological samples is presented. The parallel optical atomic force microscopy readout system has been developed and presented elsewhere. The arrays are ...

2012

Adaptive Vibration Suppression System: An Iterative Control Law for a Piezoelectric Actuator Shunted by a Negative Capacitor

Tomas Sluka

An adaptive system for the suppression of vibration transmission using a single piezoelectric actuator shunted by a negative capacitance circuit is presented. It is known that by using a negative-capacitance shunt, the spring constant of a piezoelectric ac ...

Ieee-Inst Electrical Electronics Engineers Inc2012

An Active Uprighting Mechanism for Flying Robots

Dario Floreano, Jean-Christophe Zufferey, Adrien Briod, Adam Klaptocz, Ludovic Daler

Flying robots have unique advantages in the exploration of cluttered environments such as caves or collapsed buildings. Current systems however have difficulty in dealing with the large amount of obstacles inherent to such environments. Collisions with obs ...

Ieee-Inst Electrical Electronics Engineers Inc2012

Dynamic fracturing simulation of brittle material using the distinct lattice spring method with a full rate-dependent cohesive law

Jian Zhao, Gaofeng Zhao, Tohid Kazerani

A full rate-dependent cohesive law is implemented in the distinct lattice spring method (DLSM) to investigate the dynamic fracturing behavior of brittle materials. Both the spring ultimate deformation and spring strength are dependent on the spring deforma ...

Springer Vienna2010

Yield Stress of Multimodal Powder Suspensions: An Extension of the YODEL (Yield Stress mODEL)

Paul Bowen

The prediction of the rheological properties of concentrated suspensions is of great importance both in industrial processes (ceramics, cements, and pharmaceutics) and natural phenomena (debris flow, soil erosion). In a previous paper, we presented a new m ...

2007