Publications associées à Damping factor

Electroacoustic absorbers for the low-frequency modal equalization of a room: what is the optimal target impedance for maximum modal damping, depending on the total area of absorbers?

Hervé Lissek, Etienne Thierry Jean-Luc Rivet, Sami Driss Karkar, Véronique Adam

Electroacoustic absorbers consist of loudspeakers, shunted with an electrical circuit designed to obtain a given acoustic impedance. Their design and principles are now well understood. Unidimensional experiments, using plane waves under normal incidence i ...

2014

Development of electroacoustic absorbers as soundproofing solutions for industrial ventilation systems

Hervé Lissek, Etienne Thierry Jean-Luc Rivet, Victor Desarnaulds

In many industrial environments, room and cavity modes may severely strengthen the annoyance of low frequency noises, such as in ventilation equipments. Moreover, there is an obvious technological gap in the state-of-the-art relative to low-frequency sound ...

2013

Design, Realization, and Experimental Test of a Coaxial Exponential Transmission Line Adaptor for a Half-Impulse Radiating Antenna

Nicolas Mora Parra

This paper describes the simulation, design, realization, and experimental test of a tapered transmission line (TL) for adapting a broad-band impulse generator to a radiating antenna, for a frequency range of 50 MHz-1 GHz. Two different taper geometries ar ...

Ieee-Inst Electrical Electronics Engineers Inc2013

ELECTROMAGNETIC CHARACTERIZATION OF MATERIALS FOR THE CLIC DAMPING RINGS

Carlo Zannini, Giovanni De Michele, Eirini Koukovini Platia, Giovanni Rumolo

The performance of the Compact LinearCollider (CLIC) damping rings (DR) is likely to be limited by collective effects due to the unprecedented brilliance of the beams. Coating will be used in both electron (EDR) and positron damping rings (PDR) to suppress ...

www.jacow.org2012

Study on room modal equalization at low frequencies with electroacoustic absorbers

Hervé Lissek, Romain Boulandet, Etienne Thierry Jean-Luc Rivet, Iris Rigas

Nowadays, requirements for acoustic treatments in rooms are ever more demanding in terms of performance and compactness. A recurring issue in closed spaces is the occurrence of standing waves and acoustic interferences at low frequencies. These unwanted ph ...

2012

Advanced control for modifying the acoustic impedance at the diaphragm of a loudspeaker

Hervé Lissek, Romain Boulandet, Etienne Thierry Jean-Luc Rivet

The control of low-frequency sound fields can be addressed efficiently through acoustic impedance matching. Basically, the diaphragm of electroacoustic transducers are used as refracting surface that controls the reaction of the boundaries in any surroundi ...

2012

Kerr effect in structured superluminal media

Luc Thévenaz, Sang Hoon Chin, Andrey Denisov

A comprehensive overview is presented about optical fiber-based tunable photonic delay lines, which have been steadily developed over the last decade for the realization of all-optically controlled timing functions. The most widely used techniques, such as ...

Society of Photo-Optical Instrumentation Engineers (SPIE)2012

Passive damping of composite blades using embedded piezoelectric modules or shape memory alloy wires: a comparative study

Véronique Michaud, Antoine Sigg, Andrea Bergamini

Emission reduction from civil aviation has been intensively addressed in the scientific community in recent years. The combined use of novel aircraft engine architectures such as open rotor engines and lightweight materials offer the potential for fuel sav ...

Institute of Physics2012

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Damping factor

Electroacoustic absorbers for the low-frequency modal equalization of a room: what is the optimal target impedance for maximum modal damping, depending on the total area of absorbers?

Feeding structure influence on performance of two UWB antennas near a human arm

Development of electroacoustic absorbers as soundproofing solutions for industrial ventilation systems

Design, Realization, and Experimental Test of a Coaxial Exponential Transmission Line Adaptor for a Half-Impulse Radiating Antenna

Electroacoustic metamaterials: achieving negative acoustic properties with shunt loudspeakers

ELECTROMAGNETIC CHARACTERIZATION OF MATERIALS FOR THE CLIC DAMPING RINGS

Study on room modal equalization at low frequencies with electroacoustic absorbers

Advanced control for modifying the acoustic impedance at the diaphragm of a loudspeaker

Kerr effect in structured superluminal media

Passive damping of composite blades using embedded piezoelectric modules or shape memory alloy wires: a comparative study

Graph Chatbot

Chattez avec Graph Search

Study on room modal equalization at low frequencies with electroacoustic absorbers

Advanced control for modifying the acoustic impedance at the diaphragm of a loudspeaker

Electroacoustic metamaterials: achieving negative acoustic properties with shunt loudspeakers

Design, Realization, and Experimental Test of a Coaxial Exponential Transmission Line Adaptor for a Half-Impulse Radiating Antenna

Feeding structure influence on performance of two UWB antennas near a human arm

Development of electroacoustic absorbers as soundproofing solutions for industrial ventilation systems

ELECTROMAGNETIC CHARACTERIZATION OF MATERIALS FOR THE CLIC DAMPING RINGS

Kerr effect in structured superluminal media

Electroacoustic absorbers for the low-frequency modal equalization of a room: what is the optimal target impedance for maximum modal damping, depending on the total area of absorbers?

Passive damping of composite blades using embedded piezoelectric modules or shape memory alloy wires: a comparative study