Dr. Hervé Lissek - Journées d'automne SSA 2006 Active acoustic absorption General presentation - applications Dr. Hervé Lissek Laboratoire d’Electromagnétisme.

Slides:

Advertisements

Similar presentations

C. M. Johnson, P. H. Riley and C. R. Saha Thermo-acoustic engine converts thermal energy into sound energy by transferring heat between the working media.

Advertisements

| Page Angelo Farina UNIPR / ASK Industries | All Rights Reserved | Confidential Boundary conditions The external surface of the solid model.

The Fully Networked Car Geneva, 4-5 March Jean-Pierre Jallet Car Active Noise Cancellation for improved car efficiency, From/In/To car voice communication.

Living room acoustics You can use the heading from the model documentation for the title. © 2013 COMSOL. All rights reserved.

Sedan Interior Acoustics

ACTIVE CONTROL OF SOUND Professor Mike Brennan Institute of Sound and Vibration Research University of Southampton, UK.

J. Stuart Bolton Ph.D. Institute of Sound and Vibration Research, Southampton University, UK. Poroelastic materials and applied signal processing Professor.

Design of a Low-Noise 24 GHz Receiver Using MMICs Eric Tollefson, Rose-Hulman Institute of Technology Advisor: Dr. L. Wilson Pearson.

Sandra Rodiño Palacios – Statoil ASA

Design and performance of the Dual detector with large area capacitive readout 4 rd ILIAS-GW Meeting, October 8 th – 9 th 2007, Tuebingen Paolo Falferi.

Numerical Simulation Project University of Parma.

1 Filters Definition: A filter is a frequency selective system that allows energy at certain frequencies and attenuates the rest.

EE 5340/7340, SMU Electrical Engineering Department, © Carlos E. Davila, Electrical Engineering Dept. Southern Methodist University slides can be.

J. N. DenenbergActive Noise Cancellation1 NOISE CANCELLATION INTRODUCTION TECHNOLOGY APPLICATIONS DEMONSTRATION.

School of Mechanical Engineering, Universiti Sains Malaysia

BGA 2007 Different aspects of seismic amplitude decay in viscous magma Patrick Smith Supervisor: Jürgen Neuberg School of Earth and Environment, The University.

Low frequency coda decay: separating the different components of amplitude loss. Patrick Smith Supervisor: Jürgen Neuberg School of Earth and Environment,

The Future of Sound Reinforcement(?) Prof. David G. Meyer School of Electrical & Computer Engineering.

Lecture 4b Fiber Optics Communication Link 1. Introduction 2

Circuit Theory 2  Topics Impedance matching, Impedance transformation, Bandwidth and Noise.  How you will use these topics Understanding the rangefinder.

Experimental Equalization of a One-Dimensional Sound Field Using Energy Density and a Parametric Equalizer Micah Shepherd, Xi Chen, Timothy W. Leishman,

Mechanical amplifiers for the DUAL detector: lumped and distributed element design 3 rd ILIAS-GW Meeting, October 26 th – 27 th 2006, London Paolo Falferi.

Measurement and Instrumentation Dr. Tayab Din Memon Assistant Professor Dept of Electronic Engineering, MUET, Jamshoro. ACTIVE FILTERS and its applications.

Dr. Hervé Lissek EPFL - Laboratoire d’ElectroMagnétisme et d’Acoustique.

Frequency Characteristics of AC Circuits

ACTIVE NOISE CONTROL By Leonardo Andrés Zheng Xuezhi Active noise control implemented by adaptive filtering.

Implementation of a wideband phase shifter for phased array antennas MSc/M-Tech Electrical Engineering FSATIE/CPUT Vernon Davids Supervised by Dr. R. R.

Maximization of Flow through Intake & Exhaust Systems

Page 0 of 23 MELP Vocoders Nima Moghadam SN#: Saeed Nari SN#: Supervisor Dr. Saameti April 2005 Sharif University of Technology.

Electroacoustic absorbers low frequency absorption by hybrid sensor/shunt-based impedance control Dr. Hervé Lissek, Dr. Sami Karkar, Etienne Rivet (EPFL)

Estimation of Soil Permeability Using An Acoustic Technique Department of Civil Engineering The University of Mississippi University University, MS

ARENA Workshop, May, 2005 First Activities in Acoustic Detection of Particles in UPV M. Ardid, J. Ramis, V. Espinosa, J.A. Martínez-Mora, F. Camarena,

Adaptive shunted piezoelectric metacomposite: a new integrated technology for vibroacoustic control Dr M. Collet(1), Dr M. Ouisse(1), F. Tatéo, Pr M. Ichchou(2),

1 Sound Field Modeling in Architectural Acoustics using a Diffusion Equation Based Model N. Fortin 1,2, J. Picaut 2, A. Billon 3, V. Valeau 4, A. Sakout.

Lecture Outline Chapter 13 College Physics, 7 th Edition Wilson / Buffa / Lou © 2010 Pearson Education, Inc.

Yi HUANG Department of Electrical Engineering & Electronics

Advanced Simulation Techniques for the coupled Fatigue and NVH Optimization of Engines. K+P Software, Schönbrunngasse 24, A Graz / Austria Tel.:

Akustisches Kolloquium Electroacoustic absorption: towards room equalization in the low- frequency range Dr. Hervé Lissek EPFL STI IEL LTS2

University of Kurdistan Food Quality Evaluation Methods (FQEM) Lecturer: Kaveh Mollazade, Ph.D. Department of Biosystems Engineering, Faculty of Agriculture,

Present document contains informations proprietary to France Telecom. Accepting this document means for its recipient he or she recognizes the confidential.

Surface Acoustics Wave Sensors. Outline Introduction Piezoelectricity effect Fabrication of acoustic waves devices Wave propagation modes Bulk Wave sensor.

Ground Vibrations and Air Blasts: Causes, Effects and Abatement.

Mechanical Mode Damping for Parametric Instability Control

Passive isolation: Pre-isolation for FF quads A. Gaddi, H. Gerwig, A. Hervé, N. Siegrist, F. Ramos.

SOUND INSULATION. SOUND INSULATION: Is process whereby structures and materials are arranged to reduce the transmission of sound from one room or area.

MECHANICS OF SOUND ABSORPTION

SOUND ABSORBING MATERIALS. Sound absorption? Or sound proofing If the objective is to stop sound from entering or leaving a space, then you will most.

Wave Action Theory for Turning of Intake & Exhaust Manifold

Microwave Engineering Chapter 5.7 ~ 5.9

Antenna Matching Techniques

1 Opto-Acoustic Imaging 台大電機系李百祺. 2 Conventional Ultrasonic Imaging Spatial resolution is mainly determined by frequency. Fabrication of high frequency.

SUPERCONDUCTING VOICE COIL – A ROUTE TO INCREASE EFFICIENCY OF AN ELECTRODYNAMIC LOUDSPEAKER Ivan Djurek *1, Danijel Djurek *2, Branko Somek *1 *1 Faculty.

ACOUSTICS Aural Comfort & Noise.

Auditorium Acoustics 1. Sound propagation (Free field)

Single-element transducers properties

(plus some seismology)

Demonstration of Small Scale Solar Gas Turbine

Selected Topics in Engineering Acoustics

Microwave Engineering by David M. Pozar Ch. 4.1 ~ 4 / 4.6

The Doppler Effect PHY238Y Lecture 13 References:

OPTICAL SOURCE : Light Emitting Diodes (LEDs)

? If a tree fell in a wood and there was no-one there to hear it – would it make a sound?

An active resonant absorber for flexural waves in a rod

Modelling and simulation of a new variable stiffness holder

Design of Mufflers and Silencers

Kristopher Innanen and Arthur Weglein University of Houston

Flame, Sound and Feedback

Combining magma flow models with seismic signals

(plus some seismology)

Therapeutic equipment I

Presentation transcript:

Dr. Hervé Lissek - Journées d'automne SSA 2006 Active acoustic absorption General presentation - applications Dr. Hervé Lissek Laboratoire d’Electromagnétisme et d’Acoustique EPFL

Dr. Hervé Lissek - Journées d'automne SSA /22 Introduction: ANC “Usual” active noise control (ANC): aims at interfering a primary sound field (the unwanted noise) with a synthesized secondary sound field Efficient for harmonic sound in 1-D propagation, even more if stationary

Dr. Hervé Lissek - Journées d'automne SSA /22 Introduction: 3D ANC Contra-productive for complex 3D non- stationary noises

Dr. Hervé Lissek - Journées d'automne SSA /22 Introduction: Active absorber Aim of this research: design a broadband acoustic absorber Principle: active impedance control of a resonator contrôle1 surface active Z a1 absorption active

Dr. Hervé Lissek - Journées d'automne SSA /22 Introduction: Active absorber Aim of this research: design a broadband acoustic absorber Principle: active impedance control of a resonator Assessed applications: room acoustics active noise attenuation (harmonic noise sources) low frequency control, modal control

Dr. Hervé Lissek - Journées d'automne SSA /22 Building acoustics: room acoustics Reflection coeffiction r function of Z ms Reflection factor R function of Z ms Absorption factor  function of r (R), then of Z ms WiWi W r =RWi  F v

Dr. Hervé Lissek - Journées d'automne SSA /22 Building acoustics: sound insulation Mechanical impedance of the material: Sound insulation depends on Z ms

Dr. Hervé Lissek - Journées d'automne SSA /22 Principle of passive damping Acoustic interface : Z a (  )= (R ms + j  M ms +(j  C ms ) -1 )/S(R,M,C system,  = resonance (): Z a (  r )= R ms /S proportional to Z c = .c (characteristic impedance) param of absorption S (absorbing area) M ms (material mass) C ms (material suspension) R ms (losses) Acoustic field S

Dr. Hervé Lissek - Journées d'automne SSA /22 Principle of passive resonance (): Z a (  r )= R ms /S proportional to Z c = .c (characteristic impedance) Note: when Z a =Z c (impedance matching)  transparency : the material is totally absorbent factors of absorption S (absorbing area) M ms (material mass) C ms (material suspension) R ms (losses) Acoustic field S

Dr. Hervé Lissek - Journées d'automne SSA /22 Specifications of active acoustic absorbers Acoustic resonator  resonance: frequency f r, quality factor Q The aim of active absorption: allow the modification of f r and Q, by way of simple (electric) control  modification of the properties of the absorber: make it more absorbent at resonance (acoustic impedance Z a to match characteristic impedance Z c of the medium) make it absorbent over a wider frequency range possibility to shift the resonance frequency

Dr. Hervé Lissek - Journées d'automne SSA /22 behaviour of passive absorption f r =30 Hz Z a (  =  r ) ~ ½ Z c factors of absorption S (absorbing area) M ms (material mass) C ms (material suspension) R ms (losses) aim: enhance losses

Dr. Hervé Lissek - Journées d'automne SSA /22 Ideal behaviour of active absorption Z a (  =  r ) = Z c  TOTAL ABSORPTION ff factors of absorption S (absorbing area) M ms (material mass) C ms (material suspension) variable R ms aim: enhance bandwidth

Dr. Hervé Lissek - Journées d'automne SSA /22 Principle of active absorption GOAL: Active control : modification of R ms Z a (  )= (R ms (controlled)+ j  M ms +(j  C ms ) -1 )/S 2 =Z c

Dr. Hervé Lissek - Journées d'automne SSA /22 Principle of active resonance shift GOAL: Active control : modification of f r Z a (  )= (R ms + j  M ms (controlled) +(j  C ms (controlled)) -1 )/S 2

Dr. Hervé Lissek - Journées d'automne SSA /22 Application: « active materials » q qq PP “Resonator” = electrodynamic loudspeaker

Dr. Hervé Lissek - Journées d'automne SSA /22 Calculations normalized acoustic admittance (Z c /Z a ) as feedback gains increase

Dr. Hervé Lissek - Journées d'automne SSA /22 Calculations absorption coefficient (  f°(Z a )) as feedback gains increase

Dr. Hervé Lissek - Journées d'automne SSA /22 Experimental results

Dr. Hervé Lissek - Journées d'automne SSA /22 Experimental results measured normalized admittance

Dr. Hervé Lissek - Journées d'automne SSA /22 Experimental results measured absorption coefficients

Dr. Hervé Lissek - Journées d'automne SSA /22 Conclusion Validation of the concept of active materials: calculations promise good performances, even without specific transducer (usual loudspeaker) experimental results show good tendency not much expensive in regards with the acoustic gains: cheap actuators (usual loudspeakers) cheap sensors (back-electret microphones) simple electric control (discrete components)

Dr. Hervé Lissek - Journées d'automne SSA /22 Perspectives Optimization in progress : dedicated transducers enhanced control assess energy transfer Potential transfer of technology: industries concerned with non- stationary broadband or narrow band noises  optimize the concept within applied frameworks aircraft engines (SNECMA) electric industry railway industry buildings etc...

Dr. Hervé Lissek - Journées d'automne SSA 2006 THANK YOU FOR YOUR ATTENTION