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Versione italiana
Academic year
Didactic period
Primo Semestre

Training objectives

The course aims to provide knowledge of the basic principles of acoustics in its specific mechanical engineering applications.
At the end of the course the student will be able to solve practical problems of sound propagation outdoors and indoors. Will be able also to assess the sound insulation and sound absorbing properties of materials used for the noise and vibration control.


Knowledge of Math and Physics

Course programme

The nature of sound, the acosutic waves and the quantities that characterize them. Anatomy and physiology of the ear-5 hours
Sound propagation outdoors-3 hours
Insulation and sound absorption. Phenomena of absorption, reflection and transmission . The airborne sound insulation : the law of mass , resonance effect and coincidence, light walls , double walls , composite walls-8 hours
Sound absorption, sound-absorbing materials-2 hours
Propagation of sound in enclosed spaces
Acoustics of enclosed spaces : geometric treatment , treatment efficiency and statistics , the theory of Sabine . Sound energy density in the system , the reverberation time . Other expressions of the reverberation time . Reverberant acoustic fields and semi- reverberant . Acoustic field in an industrial environment-4 hours
Instrumentation and measurement techniques
Measured and frequency analysis : microphones, time constants , filters, equivalent level . Principles of signal analysis , FFT . Sound intensity , sound power , sound intensity measurement instrumentation , practical applications. Measurement of sound power: legislative and regulatory references for the sound power , sound power measurement with measurement of sound pressure level ( ISO 3740-3747 series ) with technical and sound intensity (ISO 9614-1/2 )- 8 hours
Reclamation of noise sources
Mode noise generation , encapsulation , silencers ( reactive , dissipative , mixed) , acoustic screens , environmental treatments-4 hours
Numerical exercises - 10 hours
Laboratory experiences - 4 hours

Didactic methods

In the A.Y. 2020/21 the Course will be given by the web. In particular the more theoretical lessons will be pre-recorded and provided to the students in a repository under Google Classroom. The numerical exercises will be tought during streaming lessons which will also be recorded and made available. Pdf files of the completed exercises will be also produced and accessible to the students. The streaming lessons will be als he occasion for questions and answers reagarding the theory. The laboratory activity will be proposed in a remore mode by using pre-recorded material or by direct shooting and streaming. All in all it is estimated that half of the course will be given in streaming and half with pre-recorded material.

FIRST LESSON - Septembr 29th 2020 h . 8.30 link:

Learning assessment procedures

First a written test after which you will be able to sustain the oral examination.
The written test is designed to assess the student's ability to solve numerically a simple issue of Applied Acoustics; during the oral examination will occur the theoretical and practical knowledge of Applied Acoustics.
The rating is assigned on a scale from 18 to 30/30 according to the answers given by the students on written test and theory questions.
The exam will take place in remote mode with operational indications (platform, address etc..) given by to hte students a few days in andvance with respect to the exam's date.

Reference texts

The Course material and the recordings will be available on a platform besides the istitutional site.
Other recommended texts for study:
Manuale di Acustica Applicata, a cura di R. Spagnolo, Città Studi Edizioni, 2008;
L.Beranek, Noise and vibration control, Institute of Noise Control Engineering (1988).