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Viennet Emmanuel

Professeur HES associé

Contrat principal

Professeur HES associé

Téléphone: +41 26 429 66 70

Bureau: E00.08

Haute école d'ingénierie et d'architecture de Fribourg
Boulevard de Pérolles 80, 1700 Fribourg, CH

Institut
SeSi - Sustainable Engineering Systems Institute

BSc HES-SO en Génie mécanique - Haute école d'ingénierie et d'architecture de Fribourg

Hydraulique de puissance
Systèmes d'entraînement
Modélisation de systèmes

2020

Robustness of the liebherr-aerospace eha technology for future flight control application ArODES Conference

Emmanuel Viennet, Henry Wider

Proceedings of the 12th International Fluid Power Conference, 12-14 October 2020, Dresden, Germany

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Résumé:

Future more electric aircraft (MEA) architectures require a new generation of power-by-wire actuators, e.g. Electro Hydrostatic Actuators (EHA). These units have to be capable of frontline operation of safety critical flight control surfaces over the entire aircraft life. Prove of robustness becomes a challenging objective. This paper illustrates the Liebherr-Aerospace EHA technology as well as methods for validation of robustness. It gives an insight regarding the design of a robust piston pump.

Preliminary design and testing of a servo-hydraulic actuation system for an autonomous ankle exoskeleton ArODES Conference

Emmanuel Viennet, Loïc Bouchardy

Proceedings of the 12th International Fluid Power Conference, 12-14 October 2020, Dresden, Germany

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Résumé:

The work presented in this paper aims at developing a hydraulic actuation system for an ankle exoskeleton that is able to deliver a peak power of 250 W, with a maximum torque of 90 N.m and maximum speed of 320 deg/s. After justifying the choice of a servo hydraulic actuator (SHA) over an electro hydrostatic actuator (EHA) for the targeted application, some test results of a first functional prototype are presented. The closed-loop unloaded displacement frequency response of the prototype shows a bandwidth ranging from 5 Hz to 8 Hz for displacement amplitudes between +/-5mm and +/- 20mm, thus demonstrating adequate dynamic performance for normal walking speed. Then, a detailed design is proposed as a combination of commercially available components (in particular a miniature servo valve and a membrane accumulator) and a custom aluminium manifold that incorporates the hydraulic cylinder. The actuator design achieves a total weight of 1.0 kg worn at the ankle.

2018

Noise and vibration reduction for an aerospace secondary controlled hydraulic motor ArODES Conference

Emmanuel Viennet

Proceedings of the 11th International Fluid Power Conference, 19-21 March 2018, Aachen, Germany

Lien vers la publication

Résumé:

During flight, passenger comfort is affected by noise emissions from various aircraft systems. Apart from jet engines one of the main sources of noise within the fuselage is the power control unit (PCU) for high-lift actuation. In preparation for take-off and landing this hydraulic motor is responsible for the extension and retraction of the slats and flaps. Along with the increase in operating pressure from 206bar (3,000psi) to 345bar (5,000psi) noise and vibration induced by fluid power systems became more striking. Consequently the aim of the BMWI founded research project “Move On” was to reduce the emissions of Liebherr’s power control unit. The results of these research activities are presented within this paper. It is shown how the noise emissions could be reduced in a secondary controlled hydraulic motor by means of a valve-plate and structure optimization. In addition the results of a noise measurement campaign, conducted by Airbus on an A350, are presented.

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