This page is related to the Acoustics part of the **Vibrations and acoustics** MECA-H-411 BRUFACE course.

For the Vibrations part, please visit Arnaud Deraemaeker’s page.

**Resources**

- Textbook in French
- Textbook in English
- 2019-2020 Powerpoint set in English: the course being now organized according to the inverted class principles, the slides are no longer presented
*as such*. You may use them as an alternative to the textbook and videos but**I do not**warrant their compatibility with the 2021-2022 course content. - I need help: a discussion page where you can raise questions and (hopefully) get answers !

**Video set and accompanying material**

- 000 – Introduction to the video series – 00’39
- 001 – Definitions – 7’45 – Textbook: section 2.1
- 002 – Relevance of acoustics – 4’12 – Textbook: section 2.4
- 003 – Scope of acoustics – 17’48 – Textbook 2.2 and 4.2
- To get a flavor of the scope of acoustic research and review up-to-date topics, you may want to take a look at the title of some of the latest publications in the Journal of the Acoustical Society of America and Journal of the Audio Engineering Society.
- According to your own area of interests, you may look at some of the following videos and additional material.
**Non-linear acoustics:**sonoluminescence, acoustic levitation. **Physiological acoustics:**physiology of hearing (EN, FR), physiology of phonation (EN, FR).**Bioacoustics:**snapping shrimp, singing mice.**Music and musical instruments:**violin, piano, cymbals.**Underwater acoustics:**acoustic thermometry of oceans climate.

- 004 – Hypotheses of linear acoustics – 10’30 – Textbook 4.1
- 005 – One-dimensional propagation – 18’00 – Textbook 4.3 and 4.4 (sections 4.5 and 4.6 are suggested as additional reading material)
- There is no video on
**chapter 5 (Fourier analysis)**because the basics of signal processing, Fourier series and Fourier transforms are assumed to be known. Please read chapter 5 or look at the corresponding slide set if you need a refresher. We’ll do some exercises in the classroom to get everyone up to speed on frequency domain analysis … which will be used throughout the course ! - 006 – Acoustics in the frequency domain – 23’34 – Textbook 6.1 to 6.4 + Section 5.3.2.
- Plane waves and spherical waves in the frequency domain – This topic will be covered in the classroom. Textbook 6.5 and 6.6.
**Note:**Classroom related material will normally only be posted AFTER the classroom. We make an exception here because I’d like to get feedback on videos like this one. It requires a lot of work and if students are not quite interested I will not do more of them. - Here is a note clarifying the definition of (1) instantaneous intensity and its spectrum, (2) active intensity, (3) spectral density of active intensity and its relationship with the cross-correlation of the pressure and velocity signals.
- If you are worried about the notion of phase reference, you may want to look at this note.

- Plane waves and spherical waves in the frequency domain – This topic will be covered in the classroom. Textbook 6.5 and 6.6.
- 007 – The decibel scale 16’57 – Textbook 7.1 and 7.2.
- Every student is requested to run a Fletcher-Munson-like auditory test and to report the results. Here is the Excel report template.

- 008 – More on acoustic levels: weighted levels, band levels, time-dependent levels, statistical levels, white & pink noise – Textbook 7.3 and 7.4
- 009 – Reflection under normal incidence
- 010 – Reflection under oblique incidence