Concept

Hélicoptère

Publications associées (50)

EXPERIMENTAL INVESTIGATION OF FLOW INSTABILITIES AND ROTATING STALL IN A HIGH-ENERGY CENTRIFUGAL PUMP STAGE

François Avellan, Maher Kayal, Mohamed Farhat, Laurent Fabre, Stefan Berten, Philippe Dupont

In centrifugal pumps, the interaction between the rotating impeller and the stationary diffuser generates specific pressure fluctuation patterns. When the pump is operated at off design conditions, these pressure fluctuations increase. The resulting rise o ...

ASME2009

Energy Management for Indoor Hovering Robots

Dario Floreano, Jean-Christophe Zufferey, James Roberts

Flying has an advantage when compared to ground based locomotion, as it simplifies the task of overcoming obstacles and allows for rapid coverage of an area while also providing a birds-eye-view of the environment. One of the key challenges that has preven ...

2008

Cavitation in Kármán Vortex Shedding from 2D Hydrofoil: Wall Roughness effects

François Avellan, Mohamed Farhat, Philippe Ausoni

The present study deals with the shedding process of the Kármán vortices in the wake of a NACA0009 hydrofoil at high Reynolds number. This research addresses the effects of the foil leading edge roughness on the wake dynamic with a special focus on the vor ...

2007

Dynamic response of chiral truss-core assemblies

Alessandro Spadoni

Periodic cellular configurations with negative Poisson's ratio have attracted the attention of several researchers because of their superior dynamic characteristics. Among the geometries with a negative Poisson's ratio, the chiral topology features localiz ...

SAGE Publications2006

Chiral hexagonal cellular sandwich structures: dynamic response

Alessandro Spadoni

Periodic cellular configurations with negative Poisson's ratio have attracted the attention of several researchers because of their superior dynamic characteristics. Among the geometries featuring a negative Poisson's ratio, the chiral topology possesses a ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2005

HELIMAP: Rapid Large Scale Mapping Using Handheld LiDAR/CCD/GPS/INS Sensors on Helicopters.

Jan Skaloud, Julien Vallet, Grégory Veyssiere

The HELIMAP is a portable mapping system for quick helicopter deployment. It integrates high accuracy navigation sensors (GPS/INS) with Airborne Laser Scanner (ALS) and high-resolution digital (CCD) camera. This paper presents the system hardware and softw ...

2005

Acoustic node calibration using helicopter sounds and Monte Carlo markov chain methods

Volkan Cevher

A Monte-Carlo method is used to calibrate a randomly placed sensor node using helicopter sounds. The calibration is based on using the GPS information from the helicopter and the estimated DOA's at the node. The related Cramer-Rao lower bound is derived an ...

2004

PID vs LQ Control Techniques Applied to an Indoor Micro Quadrotor

Roland Siegwart

The development of miniature flying robots has become a reachable dream thanks to the new sensing and actuating technologies. Micro VTOL1 systems represent a useful class of flying robots because of their strong abilities for small-area monitoring and buil ...

2004

High accuracy handheld mapping system for fast helicopter deployment

Jan Skaloud, Julien Vallet

This paper presents a self-contained, light and flexible mapping system that can be quickly deployed into inaccessible areas. Although designed to measure wind-transported snow volumes and the snow avalanche runoff over and experimental site, the system is ...

2002

3-DIMENSIONAL VARIABLE-ANGLE NUCLEAR-MAGNETIC-RESONANCE EXCHANGE SPECTROSCOPY WITHOUT ROTOR AXIS HOPPING

David Lyndon Emsley

Slow, large-amplitude chain motions play an important role in determining the macroscopic mechanical properties of polymers. Although such motions have been studied quantitatively by two-dimensional (2D) nuclear: magnetic resonance (NMR) exchange experimen ...

AMER INST PHYSICS1994

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