Posted 130219 Change in schedule. Wolfgang's presentation of Project Work 4 is moved from Thursday to Monday, Feb 25 at 13:15. I continue with lectures as soon as Wolfgang has finished. At Thursday Feb 21, 11:00, after my lectures, I will try to arrange a guided tour through the division where we look at the lab. facilities and experience some acoustical demonstrations. /Patrik

Posted 130219 Here's the notes of the mid course evaluation meeting:

mid meeting

Posted 130115 This course page is updated for year 2013.

Posted 130115 Study period 3, 2012/2013: The lectures are generally scheduled Mondays 13:15-16:00, Thursdays 09:00-11:45. At least 2 hours of lectures each time and then time for information and consultation relating to the project work.

Posted 130115 The first lecture is Monday Jan 21, 2012, at 13:15 in the Teaching Laboratory at Applied Acoustics (Avd. för teknisk akustik).

How to find Applied Acoustics: Map

Posted 130115 The laboratory work is held study week 2. A booking list will be available Thursday in study week 1. /Patrik

Lectures

Download Moving Acoustics (software for Windows). It is a collection of animations and sounds, which demonstrate the physical processes behind acoustics, like wave propagation, sound sources, Snells law etc.

Lecture 1 Introduction

Lecture 2 Sound waves and acoustic sources

Lecture 3 Physical phenomena influencing sound propagation

Lecture 4 Sound propagation outdoors

Lecture 5 Waves and vibrations on solids

Lecture 6 Silencers

Lecture 6 Vehicle acoustics (Lars Ivarsson)

Lecture 6 Order analysis (Lars Ivarsson)

Lecture 6 Muffler design (Lars Ivarsson)

Lecture 7 Sound radiation from structures

Lecture 8 Vibration isolation (Lars Ivarsson)

Lecture 9 Sound fields in cavities

Lecture 10 Sound insulation part 1

Lecture 11 Sound insulation part 2

Lecture 12 Flanking transmission, Practical Building Acoustics

Lecture 12 Building Acoustics (Pontus Thorsson's presentation)

Lecture 13 Absorbers

Summary related to learning outcomes

Summary - the flow chart

Animations A collection with some of the Matlab-animations presented during the lectures.

Project work

General

The project work should be made in groups of two students. The written report will be graded. Send the written report by e-mail in pdf-format to Wolfgang Kropp.

Matlab or Octave is recommended for the analysis in the project work (for more information see below).

Reports

Some useful information:

Applied Acoustics' Report Writing Guidelines.

Grading of the reports.

Each project work description will be added in due time.

Slides of the Project work Introduction and Introduction to the first Project work.

Introduction.

Part 1

Project work description

Deadline for handing in the written report one week after your scheduled laboratory time.

Send the report pdf to wolfgang.kropp@chalmers.se

Lab. work description 1. Please, have a look at it before the lab.

R_A weighting function - MATLAB function for the a weighting.

Part 2

Deadline for handing in the written report: Feb 15, 2013, 23:59.

Send the report pdf to wolfgang.kropp@chalmers.se

Project work - Part 2

tailpipe_measurements.zip - Measured pressure and transfer functions in a zipped mat-file.

ISV_pw2_leastsquare.m - MATLAB function for solving the least-square problem.

idling_sounds.zip - wav-files with sound recorded in the passenger compartment and the two exterior receiving positions to give you an idea of what was recorded. It is hard to exactly recreate the sound that was present as your loudspeakers and gain will affect the sound --- however, the sound gives at least an indication of reality. NB! Use loudpeakers with a good bass or use headphones.

Tutorial explaining MATLAB's transpose operator - You only need this if you want to solve the least-square problem without the function we provided.

Introduction slides from the lecture.

Part 3

Deadline for handing in the written report: Feb 22, 2013, 23:59.

Sent the report pdf to wolfgang.kropp@chalmers.se

Project work - Part 3 incl. excerpts from the Nordic Prediction Method.

NPM_Functions.zip - Matlab functions for the Nordic Prediction Method.

Introduction slides from the lecture.

Part 4

Deadline for handing in the written report: Mar 8, 2013, 23:59.

Send the report pdf to wolfgang.kropp@chalmers.se

Project work - Part 4.

Introduction slides from the lecture.

Laboratory work

The laboratory work is included in project work part 1.

Written Exam

Basic knowledge and understanding will be evaluated in the written exam.

Exam 070316 and Suggestions of answers

Exam 080310 and Suggestions of answers

Exam 090309 and Suggestions of answers

Exam 100309 and Suggestions of answers

Exam 110319 and Suggestions of answers

Exam 120310 and Suggestions of answers

Exam 130316 and Suggestions of answers

Matlab and Octave

It is recommended to use either Matlab or Octave for your project work.

Chalmers students can obtain Matlab here.

The free software Octave is a good alternative to Matlab. The language and all basic functions which will be used in the course are identical in Matlab and Octave.

Suggested reading

Some nice-to-know-things for the use of MATLAB (or Octave) in ISV. This is a summary of the short Matlab introduction which was given in the lectures.

Matlab introduction for ISV. This presents an introduction into how to do some common tasks related to acoustics in MATLAB. It also shows some common pitfalls and how to avoid them. Also available as an m-file for possible code reuse.

General Matlab tutorial (optional reading) by Pekalska and van der Glas, Delft Univ. of Techn. Possibly relevant sections are marked.

General Matlab tutorial (optional reading) by Griffiths, Univ. of Dundee. Possibly relevant sections are marked.

Even more Matlab tutorials can be found atMathworks' website.

Additional material

Here are some additional material for the interested reader.

The use of complex notation. Some examples to refresh your memory.

The use of logarithms. Some examples to refresh your memory.

Introduction to sound and vibration by Wolfgang Kropp and Krister Larsson. In this text you will find brief description of the importance of acoustics as discipline, it main applications and its relation to our daily life at work and at home.

The three-dimensional wave equation by Pontus Thorsson. A full derivation of the three-dimensional wave equation in solids and fluids.

Suggestions of literature

Here are some suggestions of literature for the interested and for future use. Notice that non of these textbooks are official course literature (the lecture notes posted on this home page are the official course literature). The comments after each book are my very own subjective statements. /Patrik

Building Acoustics / Tor Erik Vigran (357 pages)

A very good book about building acoustics that is up-to-date (most other books are not). The book gives a deep understanding of the underlaying physics and state-of- the-art formulas for engineers. Is also available on Norwegian (see below).

Engineering Noise Control - theory and practice / D.A. Bies (700 pages)

A very extensice book covering a wide range of topics. It was perviously course literature in the course "Engineering Acoustics" a couple of years ago. It was sometimes critisised by Students for being wordy.

Noise and Vibration Control / Leo L. Beranek (650 pages)

A very extensice book covering a wide range of topics. As an example, it contains an extensive and very good chapter on mufflers including effects of flow. However, it is not as up to date as the books of Bies or Vigran.

På svenska:

Bygningsakustikk - et grunnlag av Tor Erik Vigran (300 sidor)

En mycket bra bok om byggnadsakustik som är up-to-date (till skillnad från de flesta andra). Boken ger en djupare fysikalsisk förståelse och dags-aktuella formler för ingenjörer. Den var tidigare kurslitteratur i den numera avvecklade kursen Akustik, hus. Finns bara på norska, men det är inga problem om man kan svenska.

Ljud och Vibrationer av Boden, Carlsson, Glav, Wallin och Åbom (400 sidor)

En bok som täcker både luftljud och strukturljud med lutning åt akustik för maskininriktningen. Boken täcker mycket vilket leder till att de fysikaliska beskrivningarna ibland är korta - den djupare förståelsen kan vara svårt att få.

Byggnadsakustik - en praktisk handbok av Leif Åkerlöf (300 sidor)

En handbok för den som redan har förstått - boken ger ingen hjälp till att lära sig något nytt.