Publications associées à A Morphing Cargo Drone for Safe Flight in Proximity of Humans

Data from: Optimal blade pitch control for enhanced vertical-axis wind turbine performance

Sébastien Le Fouest, Karen Ann J Mulleners

This directory contains open-source data obtained using a single-bladed H-type vertical-axis wind turbine prototype with individual blade pitching. This data results from the optimisation of the blade's pitching kinematics using a genetic algorithm at two ...

Zenodo2024

Lumped Drag Model Identification and Real-Time External Force Detection for Rotary-Wing Micro Aerial Vehicles

Alcherio Martinoli, Lucas Cédric Wälti

This work focuses on understanding and identifying the drag forces applied to a rotary-wing Micro Aerial Vehicle (MAV). We propose a lumped drag model that concisely describes the aerodynamical forces the MAV is subject to, with a minimal set of parameters ...

IEEE2024

Heading for the Abyss: Control Strategies for Exploiting Swinging of a Descending Tethered Aerial Robot

Frank Centamori, Josephine Anna Eleanor Hughes, Max Mirko Polzin

The use of aerial vehicles for exploration and data collection has the potential to significantly aid environmental monitoring in environments which are dangerous and hard to navigate. However, within these environments navigation can often be restricted b ...

2023

The effects of kinematics, flexibility, and planform on the vortex formation and aerodynamic performance of flapping wing flight

Alexander Gehrke

In this thesis, the aerodynamic challenges in flapping wing flight are addressed. In particular, the effects of different wing kinematics, flexibilities, and planforms on the the leading edge vortex development and aerodynamic performance are investigated. ...

EPFL2023

Sharp turning maneuvers with avian-inspired wing and tail morphing

Dario Floreano, Enrico Ajanic, Mir Alikhan Bin Mohammad Feroskhan, Valentin Wüest

Flight in dense environments, such as forests and cities requires drones to perform sharp turns. Although fixed-wing drones are aerodynamically and energetically more efficient than multicopters, they require a comparatively larger area to turn and thus ar ...

2022

Design and development of the efficient anguilliform swimming robot- MAR

Auke Ijspeert, Peter Eckert, Anouk Looijestijn

Propulsion of swimming robots at the surface and underwater is largely dominated by rotary propellers due to high thrust, but at the cost of low efficiency. Due to their inherently high speed turning motion, sharp propeller blades and generated noise, they ...

2020

Downside Up:Rethinking Parcel Position for Aerial Delivery

Dario Floreano, Przemyslaw Mariusz Kornatowski, Mir Alikhan Bin Mohammad Feroskhan, William John Stewart

The conventional approach to parcel placement in most delivery drone designs today is to place the parcel centrally beneath the drone's rotor plane. However, if the parcel is too large, this will result in an obstruction of the propeller slipstream, incurr ...

2020

Human-friendly solutions for last-centimeter drone delivery

Przemyslaw Mariusz Kornatowski

The popularity of delivery drones is constantly increasing due to their ability to deliver packages more rapidly and economically than current transportation methods. Consequently, drones have been employed by logistics companies for delivering payloads to ...

EPFL2020

A bioinspired Separated Flow wing provides turbulence resilience and aerodynamic efficiency for miniature drones

Stefano Mintchev, Matteo Di Luca

Small-scale drones have enough sensing and computing power to find use across a growing number of applications. However, flying in the low-Reynolds number regime remains challenging. High sensitivity to atmospheric turbulence compromises vehicle stability ...

AMER ASSOC ADVANCEMENT SCIENCE2020

Dynamic stall on an airfoil undergoing VAWT blade angle of attack variations

Sébastien Le Fouest, Karen Ann J Mulleners, Sabrina Henne

Vertical axis wind turbines have several attractive features in the context of energy production in urban areas, but the inherent aerodynamic complexity of the flow around them has challenged their development on a larger scale. They generally operate at l ...

2020

An origami-inspired cargo drone

Dario Floreano, Przemyslaw Mariusz Kornatowski, Stefano Mintchev

Multicopters stand to revolutionize parcel delivery because of their capability to operate in areas with unsuitable road infrastructure and precisely maneuver in cluttered environments. However, current multicopters for delivery can be dangerous for people ...

2017

Underwater propelling device for underwater vehicle

Alexander Bahr, Felix Stephan Schill

The present invention relates to an underwater propelling device (10) i a stator (20) comprising circumferential arrayed coils (35) and being adapted to generate a controlled electromagnetic field along an axial direction, a shaftless propellant rotor (30) ...

2016

A new ring‐shaped wind tunnel facility to study wind‐packing of snow

Michael Lehning, Christian Gabriel Sommer, Charles Fierz

A new wind tunnel was designed and built at SLF. The facility is ring-shaped to simulate an infinite fetch. This is important for experiments where the observed processes have a slow time scale (minutes to hours). The wind tunnel was developed to study the ...

University de Genève2016

Manufacturing 100-mu m-thick silicon solar cells with efficiencies greater than 20% in a pilot production line

Christophe Ballif, Antoine Descoeudres, Stefaan De Wolf

Reducing wafer thickness while increasing power conversion efficiency is the most effective way to reduce cost per Watt of a silicon photovoltaic module. Within the European project 20 percent efficiency on less than 100-mu m-thick, industrially feasible c ...

Wiley-VCH Verlag2015

Design of Flying Robots for Collision Absorption and Self-Recovery

Adam Klaptocz

Flying robots have the unique advantage of being able to move through the air unaffected by the obstacles or precipices below them. This ability quickly becomes a disadvantage, however, as the amount of free space is reduced and the risk of collisions incr ...

EPFL2012

Experimental Investigation of the Aeroelastic Stability of an Annular Compressor Cascade at Reverse Flow Conditions

Virginie Anne Chenaux

Compressor surge events are unsafe operating regimes yielding highly unsteady flow fields in which complex aeroelastic phenomena occur. If the blade flutter and forced response behaviour (i.e. aeroelastic stability) can be predicted reliably for normal flo ...

EPFL2012

Base case process development for energy efficiency improvement, application to a Kraft pulping mill. Part II: Benchmarking analysis

François Maréchal

A new procedure for benchmarking analysis has been developed to evaluate the energy efficiency of a chemical process. Benchmarking is performed to identify process inefficiencies before developing energy enhancement measures. The new procedure combines typ ...

2011

Simulation of Fuel Ethanol Production from Lignocellulosic Biomass

Daniel Favrat, Martin Gassner, François Maréchal, Suping Zhang

Models for hydrolysis, fermentation and concentration process, production and utilization of biogas as well as lignin gasification are developed to calculate the heat demand of ethanol production process and the amounts of heat and power generated from res ...

2009

Control of the Toycopter using a Flat Approximation

Dominique Bonvin, Philippe Müllhaupt, Jean Lévine

This paper considers a helicopter-like setup called the Toycopter. Its particularities reside first in the fact that the toycopter motion is constrained to remain on a sphere and second in the use of a variable rotational speed of the propellers to vary th ...

2008

Multichannel DC-DC Converter’s Efficiency Optimisation by variable Number of active Channels

Alfred Rufer, Sylvain Lemofouet-Gatsi, Lukas Fleischli

In the context of energy storage with supercapacitors, the so called round trip efficiency is an important factor that can be strongly affected by the characteristics or performances of the used converter. This paper presents a dedicated DC-DC converter, w ...

2006