Publications related to Central force

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A first aspect of the invention relates to a force sensor assembly (1) comprising:- a support (3) adapted to be attached to a frame (5);- a force sensor (9) attached at a proximal end to said support (3) and adapted to deform in response to a force along a measurement axis (2);- an end effector (11) attached at a distal end of said force sensor (9) and adapted to come into contact with a test piece, said end effector (11) having a mass (m);- a compensating system (13) comprising a counterweight (15) having

Biomolecular condensates are cellular phase-separated droplets that usually exhibit a viscoelastic mechanical response, a behavior rationalized by modeling the complex molecules that make up a condensate as stickers and spacers, which assemble into a network-like structure. Condensates usually exhibit a solidification over a long period of time (days), a phenomenon described as aging. The emergence of such a long timescale of evolution from microscopic processes, as well as the associated microscopic reorga

Metal–organic frameworks (MOFs) are promising materials for adsorption and separation, but accurately predicting water adsorption remains a major challenge in molecular simulation. Classical force fields, such as UFF, often fail to capture the strong, directional hydrogen-bonding interactions between water and MOFs, while high-throughput density functional theory (DFT) calculations are computationally prohibitive. Here, we develop a transferable machine-learning potential (MLP) for water adsorption in Al-ba

Dataset Description This dataset accompanies the article “3D Numerical Modeling of Compressible and Cohesive Granular Flow Impact on Narrow Obstacles” published in Computational Particle Mechanics. It includes appendix material, and raw numerical time-series data with corresponding plots. The simulations were performed using the 3D Material Point Method (MPM) with a finite-strain cohesive Cam-Clay–type constitutive model (see publication for details). The dataset provides, for each simulation case: I

Magnetic nulls are locations where the magnetic field vanishes. They determine to a large degree the magnetic connectivity in a system, and are sites of magnetic reconnection. We describe a novel approach to understanding movement, appearance, and disappearance of nulls in magnetic fields. This approach is based on the concept of isotropes, or lines where the field direction is constant. These lines are streamlines of a vector field whose flux is sourced by the topological indices of nulls, and can be conce

Metal–organic frameworks (MOFs) are promising materials for gas adsorption and separation owing to their tunable structures and large capacities. Given the ubiquity of water vapor in the environment, predicting water adsorption within MOFs is critical, but the classical force fields, such as the UFF, often fail. To overcome this problem, we propose a strategy to fine-tune a machine learning potential (MLP) from the pretrained MACE model for water adsorption within MOFs. We test our strategy on a dataset of

Biomolecular condensates are cellular phase-separated droplets that usually exhibit a viscoelastic mechanical response. A behavior rationalized by modeling the complex molecules that make up a condensate as stickers and spacers, which assemble into a network-like structure. Condensates usually exhibit a solidification over a long period of time (days), a phenomenon described as aging. The emergence of such a long timescale of evolution from microscopic processes, as well as the associated microscopic reorga

Hydraulic fractures are driven by an internal fluid pressure exceeding the minimum compressive stress, propagating in a direction perpendicular to the latter. This class of tensile fractures has gained interest over the last fifty years due to the development of multiple engineering applications. Among these industrial applications are well-stimulation treatments by hydraulic fracturing used in the oil and gas industry to enhance the permeability of tight reservoirs. The same technique is used in geothermal

This master thesis investigates the effects of different roof fences on the performance of a wind turbine placed behind them by creating an idealized urban environment in a wind tunnel. Five types of fences have been tested. The 5 configurations are no fence, vertical fences, porous fences, angled fences, and curved fences. Each type of fence is divided into 3 or 4 sub-categories. The vertical fences are divided into 3 different heights. The porous fences are divided into 3 different porosities. Curved fenc

The explosive growth of machine learning in the age of data has led to a new probabilistic and data-driven approach to solving very different types of problems. In this paper we study the feasibility of using such data-driven algorithms to solve classic physical and mathematical problems. In particular, we try to model the solution of an inverse continuum mechanics problem in the context of linear elasticity using deep neural networks. To better address the inverse function, we start first by studying the s

Grippers, currently used in Industry, are not suited for clean room application. Thus, a novel type of smart gripper is being designed using Shape Memory Alloys (SMA). In the development of this Smart Gripper, the modelling of the material is quite critical. The aim of this project would be to design a working test bench so as to characterize the material based on its transition temperatures and stress-strain behaviours. The student must find an appropriate test bench solution that would be adapted to model

A mallet finger is an injury that affects the extensor tendon at the Distal interphalangeal joint (DIP). It results from a hyperflexion of the said tendon which can result in a stretching or tearing of the tendon or an avulsion of the tendon’s insertion on the dorsal lip of the distal phalanx base. This kind of injury leads to the apparition of an imbalance in the force distribution in the extensor between the proximal and distal interphalangeal joint. Mallet Finger injuries are mostly seen in young and mid

Many stone masonry structures that were constructed in the past centuries are now counted towards the cultural heritage. The low strength and brittle behavior make these heterogeneous structures very vulnerable to various natural or man-made disasters such as earthquakes. In order to ensure their structural safety and to implement appropriate interventions, engineers need to understand the failure mechanism and to estimate the force and deformation capacity. Since it is difficult to obtain detailed material

The first practical, portable “dynamometer”, designed in 1798 by Regnier, was used to quantify the muscular strength of men and animals. It was promptly used by ethnologists to test the strength of the “savages”. A smaller improved model (Collin dynamometer) is still sold to medical and para-medical practitioners. With the development of agricultural and industrial machinery from the beginning of the 19th c., the need arose to measure not only the force between a motor and a load, but also the work done and

Spring balances, based on Hooke’s law, have been used for weighing since the early 18th century. At the end of the century, naturalists such as Buffon felt the need to quantify the muscular force of men (humans) and animals. The first practical, portable “dynamometer” was designed in 1798 by Regnier, in Paris, using for the first time an oval, closed spring and displaying the indication of the maximum force, tension (“loins”) or compression (“hand”). It was promptly used by ethnologists to test the strength

Although inorganic thick-film materials are usually very stable, load sensors (i.e. force, torque and pressure) based on the piezoresistive effect of thick-film resistors often exhibit some drift, with major contributions stemming from a) temperature changes or gradients, coupled with the temperature coefficient of resistance (TCR) of the sensing bridge resistors, and b) ill- defined mechanical boundary conditions, due to insufficient decoupling, plastic deformation used materials, friction or loading error

Physical interaction between humans and robots arises a large set of challenging problems involving hardware, safety, control and cognitive aspects, among others. In this context, the cooperative (two or more people/robots) transportation of bulky loads in manufacturing plants is a practical example where these challenges are evident. In this paper, we address the problem of teaching a robot collaborative behaviors from human demonstrations. Specifically, we present an approach that combines: probabilistic

Unreinforced masonry (URM) structures are known to be rather vulnerable to seismic loading. Modern URM buildings with reinforced concrete (RC) slabs might, however, have an acceptable seismic performance for regions of low to moderate seismicity. In particular in countries of moderate seismicity it is often difficult to demonstrate the seismic safety of modern URM buildings by means of force-based design methods. Displacement-based design methods are known to lead to more realistic and less conservative res

This experiment is the first test of the concept for a novel attitude determination sensor in freefall, that utilizes the Earth

s gravity gradient as a reference. Current sensors require multiple optical heads with access on all faces of a satellite that might point towards the Earth [1]. Earth sensors determine the Earth vector by sensing the position of the Earth’s horizon, detecting the Earth

s IR emission against the background of space [2]. The gravity-gradient based approach does not require optical a

This semester project comes within the scope of studies at the nanometre scale. The experimental techniques used in this work are related to atomic force microscopy, which gives a direct access to the topography and forces of the studied systems. The goal of this project is to study dependence of local humidity and ambient on hydrophobic interactions by a series of systematic experiments on several samples. The experimental part of the semester project consists in the execution of force measurements with an

Central force

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Force and torque sensor assemblies

Entropic clustering of stickers induces aging in biocondensates

Generalized Machine Learning Potentials for Predicting Low-Pressure Water Adsorption in Flexible Al-Based Metal–Organic Frameworks

Dataset for 3D Numerical Modeling of Compressible and Cohesive Granular Flow Impact on Narrow Obstacles

A Topological Approach to Magnetic Nulls

Generalized Machine Learning Potentials for Water Adsorption in Al-Based Metal–Organic Frameworks Considering Framework Flexibility

Entropic Clustering of Stickers Induces Aging in Biocondensates

Ascent and movement of buoyant fluids in the lithosphere

Effect of roof fence shape on the performance of a roof-mounted horizontal axis wind turbine

Inverse Modelling and Predictive Inference in Continuum Mechanics: a Data-Driven Approach

Design and fabrication of miniaturized shape memory alloy gripper prototype

Design of a measuring device for Mallet Finger treatment

2D meso-scale modeling of masonry elements using cohesive elements

Force and Work Measurements: The Beginnings

Early Dynamometers (from Muscle to Steam Power)

Thick-film Load-sensing bridges – Effect of Temperature and Mechanical Boundary Conditions

Learning Force and Position Constraints in Human-robot Cooperative Transportation

Towards displacement-based seismic design of modern unreinforced masonry structures

Gravity Gradient Earth Sensor experiment on REXUS 11

Atomic Force Measurements of Hydrophobic Interactions