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

Slides:

Advertisements

Similar presentations

Current techniques for measuring

Advertisements

Acoustic-Structural Interaction in a Tuning Fork

Patrick Smith Academic History PhD Project Title: Combining magma flow modelling and seismicity on Montserrat Supervisor: Prof. Jürgen Neuberg (aka Locko)

Absorptive Muffler with Shells

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

Noise & Vibrations xxx

PH0101 UNIT 2 LECTURE 31 PH0101 Unit 2 Lecture 3  Maxwell’s equations in free space  Plane electromagnetic wave equation  Characteristic impedance 

DO NOW 1.In an open tube resonator, there is a pressure ________ at both ends. 2.In a close tube resonator, there is a pressure _________ at the closed.

1 Design of Gridded-Tube Structures for the 805 MHz RF Cavity Department of Mechanical, Materials, and Aerospace Engineering M. Alsharoa (PhD candidate)

I.1 ii.2 iii.3 iv.4 1+1=. i.1 ii.2 iii.3 iv.4 1+1=

I.1 ii.2 iii.3 iv.4 1+1=. i.1 ii.2 iii.3 iv.4 1+1=

What is sound? define, define, define! Changes in air pressure Perception of the changes We can hear from about 15 changes per second to changes.

PHYS 218 sec Review Chap. 15 Mechanical Waves.

Fundamental Tones and Harmonics. A tight wire or string that vibrates as a single unit produces its lowest frequency, called its fundamental. A vibrating.

Kai Ming Li School of Mechanical Engineering Research in Environmental Acoustics Ray W. Herrick Laboratories.

Parameters, pulse parameters, attenuation, and resolution.

Wave Theory Essential Question: What is a wave?. Answer Me!!!  Give an example of a wave. Then describe what that wave carries.

Reflection A wave is reflected when it comes into contact with a barrier A wave is reflected when it comes into contact with a barrier Law of Reflection.

Wave Behavior BY JON. The Physics of Waves  All waves follow the laws of physics no matter what type  Waves can be reflected, refracted, diffracted.

The Catholic University of America Aldo Glean ENGR 518 Experimental Techniques for Graduate Students December 04, 2012 Measurement Of the Acoustic Properties.

Acoustic Analysis of the Viola By Meredith Powell Advisor: Professor Steven Errede REU 2012.

State Standards Addressed Waves: Waves have characteristic properties that do not depend on the type of wave. As a basis for understanding this concept:

1© Manhattan Press (H.K.) Ltd Stationary waves on a stretched string.

A taut wire or string that vibrates as a single unit produces its lowest frequency, called its fundamental.

Acoustics. Acoustics is the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration,

Separate branches of Mechanics and Biomechanics I. Periodic Motion. Mechanical waves. Acoustics.

Chapter 5: Normal Hearing. Objectives (1) Define threshold and minimum auditory sensitivity The normal hearing range for humans Define minimum audible.

Fundamentals of Audio Production. Chapter 1 1 Fundamentals of Audio Production Chapter One: The Nature of Sound.

Dept. of Mech. Engineering University of Kentucky 1 Wave Motion – Some Basics Sound waves are pressure disturbances in fluids, such as air, caused by vibration,

Copyright © 2009 Pearson Education, Inc. Lecture 1 – Waves & Sound b) Wave Motion & Properties.

Waves and Energy Transfer

Waves: An introduction

Waves and Sound Wave Characteristics.

The Physics of Musical Instruments

Chapter 14 Waves & Energy Transfer I. Waves Properties 1. A wave is a rhythmic disturbance that carries energy 1. A wave is a rhythmic disturbance that.

Radar is the most necessary instrument of modern age. Radar is of two types. 1-Continous high frequency radio wave. 2-Vibrational radio wave. In the first.

Waves! ________: are vibrations in space over time that carry ________ from one place to another. A ________ swinging back and forth on a string shows.

Wave Propagation Theories Study

Waves What do you know?. Types of waves Mechanical – need a medium or material to travel through ex. Water, slinky Mechanical – need a medium or material.

& Simple Harmonic Motion Any periodically repeating event. (Ex: waves, pendulums, heartbeats, etc.)

Chapter 14 Waves. I. What’s in a wave? A.A WAVE is a repeating disturbance or movement that transfers energy through matter or space. 1.Waves transfer.

Waves. What are waves? A wave is a transfer of energy from one place to another. Waves take many forms. Wave Characteristics include: –Amplitude –Wavelength.

Chapter 15: Wave Motion 15-2 Types of Waves: Transverse and Longitudinal 15-3 Energy Transported by Waves 15-4 Mathematical Representation of a Traveling.

ARCHITECTURAL ACOUSTICS

Sound. Review Sound is a mechanical wave Sound is a mechanical wave

Lecture 11 WAVE.

A taut wire or string that vibrates as a single unit produces its lowest frequency, called its fundamental.

Low frequency acoustic energy harvester and the interface circuit

Chapter 12 The Nature of Waves

SURFACE EFFECTS AND PROPAGATION CHARACTERISTICS

Waves & Energy Transfer

الفيزياء د/هالة مصطفى احمد.

Hamiltonian formalism, seismic waves, and seismic barriers

Hearing Biomechanics Standing waves.

Lesson 7 Notes Modeling Light.

UNIT IV Chapter 25 Vibrations and Waves.

What are waves? A wave is a transfer of energy from one place to another. Waves take many forms. Wave Characteristics include: Amplitude Wavelength Frequency.

Flame, Sound and Feedback

Think, Pair, Share Activity

Index Notation Sunday, 24 February 2019.

Solving Equations 3x+7 –7 13 –7 =.

الفيزياء الحيوية الطبية Medical Biophysics

Chapter 11 vocabulary Medium: matter through which a wave travels

CHARACTERISTICS OF SOUND

What are waves? A wave is a transfer of energy from one place to another. Waves take many forms. Wave Characteristics include: Amplitude Wavelength Frequency.

Wave Mechanics Physics 1.

Acoustic Holography Sean Douglass.

Chapter 13 – Waves II.

Presentation transcript:

J. Stuart Bolton Ph.D. Institute of Sound and Vibration Research, Southampton University, UK. Poroelastic materials and applied signal processing Professor of Mechanical Engineering Wave propagation and sound radiation Sound Field visualization Poroelastic materials Noise Control Americas Editor (with Patricia Davis) of the Journal of Sound and Vibration Funding from: 3M, Sony, Cummins Engines, Boeing, Raytheon Aircraft . . .

Optimization of Acoustic Treatments 3 foams , 2 air space, 3 panel F O A M 1 2 3 AIR Panel 2 Panel 3 Panel 1 Incidence 1 Tc Transmitted Reflection Rc Area I Z=0 Z=L1 Z= L2 L3 II L4 L5 III IV V VI VII Honeycomb panel solve for Area II Area IV Panel motion Area V Area III Area VI Area VII Apply b.c.’s at each interface

B&K Four-mic TL tube SEM – Thinsulate

Component Noise: e.g. Tire Radiation Analysis Procedure SPL & Sound Intensity on a hemisphere surrounding a tire [ Direct BEM ] radiation field characteristics based on Acoustic Radiation Mode (Acoustic Transfer Vector) Sound Power Radiation Efficiency Radiation Mode Contribution [ Structural Harmonic FEM ] structural wave propagation based on surface normal velocities

Acoustical Holography for Noise Source Identification: e. g Acoustical Holography for Noise Source Identification: e.g. rolling tire at 21 mph (128 Hz) n  3 Frequency # of nodes 164 Hz 8 (n=4) 140 Hz 6 (n=3) 115 Hz 4 (n=2) From Dispersion Curve