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• (repositories = "HAL - Hyper Article on Line" AND subject = "[SPI:ACOU] Engineering Sciences/Acoustics")
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repositories = "HAL - Hyper Article on Line" > : "[SPI:ACOU] Engineering Sciences/Acoustics" (x)
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Found 1,116 documents, displaying page 1 of 112

Un réfrigérateur sonore

Author(s) : Duthil, P.
Description :
Repository : HAL - Hyper Article on Line
Language(s) : Undetermined

Effect of a free-surface fluid layer on vibroacoustic response of a plate

Author(s) : Génevaux, Jean-Michel
Description : This experimental study points out the modifications of the behavior of a coupled system due to the introduction of a viscous fluid film between a gas volume and a vibrating plate. The tested configuration is composed by a cylindrical volume of gas with rigid walls excepted for one of the circular e...
Repository : HAL - Hyper Article on Line
Language(s) : English

New structure of loudspeaker

Author(s) : Lemarquand, Guy
Description : We present a new structure of loudspeaker: the motor is ironless, the suspension is ferrofluidic, the moving part is piston like, with a concave dome. The absence of iron guarantees a small and constant inductance of the moving coil, as well as the absence of Eddy currents. The motor includes two ci...
Repository : HAL - Hyper Article on Line
Language(s) : English

Mechanical Properties of Ferrofluids in Loudspeakers.

Author(s) : Lemarquand, Guy , Ravaud, Romain , Lemarquand, Valérie , Depollier, Claude
Description : This paper describes the mechanical properties of ferrofluid seals in ironless electrodynamic loudspeakers. The motor is constituted of several outer stacked ring permanent magnets. The inner moving part is a piston. In addition, two ferrofluid seals are used which replace the classical suspension. ...
Repository : HAL - Hyper Article on Line
Language(s) : English

An ironless low frequency subwoofer functioning under its resonance frequency.

Author(s) : Merit, Benoit , Lemarquand, Guy , Nemoff, Bernard
Description : A low frequency loudspeaker (10Hz-100Hz) is described. Its structure is totally ironless in order to avoid nonlinear effects due to the presence of iron. The large diaphragm and the high force factor of the loudspeaker lead to its high efficiency. Efforts have been made for reducing the non-linearit...
Repository : HAL - Hyper Article on Line
Language(s) : English

In pursuit of increasingly linear loudspeaker motors

Author(s) : Merit, Benoit , Lemarquand, Guy , Lemarquand, Valérie
Description : In this paper, analytical calculations are used to study existing loudspeaker motors totally made of permanent magnets. When the iron is removed from a loudspeaker, Eddy currents and reluctant effects are also removed, improving the linearity of the loudspeaker. Performances of each proposed magneti...
Repository : HAL - Hyper Article on Line
Language(s) : English

Ironless and leakage free voice-coil motor made of bonded magnets

Author(s) : Remy, Mathias , Lemarquand, Guy , Castagnede, Bernard , Guyader, Gaël
Description : This paper reminds the drawbacks of classical voice-coil motors and presents a way to improve them. Two ironless and leakage free structures are presented, one using traditional sintered magnets and the other one using bonded magnets, giving the pros and cons of each solution. A 2D analytical model ...
Repository : HAL - Hyper Article on Line
Language(s) : English

Motor Nonlinearities in Electrodynamic Loudspeakers: Modelling and Measurement

Author(s) : Merit, Benoit , Lemarquand, Valérie , Lemarquand, Guy , Dobrucki, Andrzej
Description : This paper studies the motor nonlinearities of a classical electrodynamic loudspeaker. Measurements show the dependence of the voice-coil inductance with its position and with the driving current as well as the force factor dependence on the coil position. They allow the tuning of the parameters of ...
Repository : HAL - Hyper Article on Line
Language(s) : English

IRONLESS LOWFREQUENCY LOUDSPEAKER WORKING UNDER ITS RESONANCE FREQUENCY

Author(s) : Merit, Benoit , Lemarquand, Guy
Description : A soon achieved low frequency loudspeaker (10 Hz to 100 Hz) is described. To suppress the non-linearities and the drawbacks due to the motor, its structure is totally ironless. The large flat diaphragm and the high force factor of the loudspeaker lead to its high efficiency. Efforts have been made f...
Repository : HAL - Hyper Article on Line
Language(s) : English

An Ironless Large Displacement Flat Piston Loudspeaker

Author(s) : Remy, Mathias , Lemarquand, Guy , Guyader, Gaël
Description : This paper presents a small wide-band loudspeaker. Particular efforts have been made to reduce the nonlinearities of the loudspeaker as much as possible. The motor structure is completely ironless, the elastomer suspensions are replaced by ferrofluid seals and a monobloc carbon foam piston substitut...
Repository : HAL - Hyper Article on Line
Language(s) : English
1 2 3 4 5 > >>

Found 1,116 documents, displaying page 1 of 112