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Scheda Riassuntiva
Anno Accademico 2020/2021
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 051489 - ROOM ACOUSTICS
  • 051487 - MODULE 1: FUNDAMENTALS OF ROOM ACOUSTICS
Docente Cairoli Maria
Cfu 5.00 Tipo insegnamento Modulo Di Corso Strutturato

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (Mag.)(ord. 270) - MI (263) MUSIC AND ACOUSTIC ENGINEERING*AZZZZ051489 - ROOM ACOUSTICS
Ing Ind - Inf (Mag.)(ord. 270) - MI (474) TELECOMMUNICATION ENGINEERING - INGEGNERIA DELLE TELECOMUNICAZIONI*AZZZZ051489 - ROOM ACOUSTICS
Ing Ind - Inf (Mag.)(ord. 270) - MI (481) COMPUTER SCIENCE AND ENGINEERING - INGEGNERIA INFORMATICA*AZZZZ051489 - ROOM ACOUSTICS

Obiettivi dell'insegnamento

This course aims to provide the basic knowledge and tools that are needed for the analysis of the various stages of acoustic spatialization in enclosures, from generation; to propagation; to reception; to perception; in various human activities. This course will enable students to gather an in-depth understanding of acoustics phenomena in encosures (buildings, auditoria, etc.) and, in particular,  to understand definitions and physical concepts behind the various related acoustic features. Physical modelling and mathematical formulation for analysing the sound will be also covered. 


Risultati di apprendimento attesi

The students will acquire:

- Knowledge of basic theory on sound generation and propagation;

- Knowledge of sound propagation in rooms, sound perception, acoustic regulation and sound absorbents;

and will develop the following skills:

- they will be able to understand and analyse acoustic phenomena in buildings;

- they will be able to understand the physical background and be ready to take in new theories that will be needed in the future.


Argomenti trattati

Oblique planar wave in a finite volume limited by perfectly rigid surfaces: vibrations in the cavity, frequencies and natural modes of the room (axial, tangential, oblique).

Absorption influence on the vibration modes of the room, damped vibration and resonance peaks. Research of natural frequencies for a free damped vibrational motion. Forced vibration: the reverberant field as a linear combination of the dumped natural motions. Reverberant field: the transient attack, steady state, the sound tail.

Diffuse sound field: hypothesis, sound intensity on the boundary as function on energy density, mean free path e time between two reflections. Sound energy balance equation: split contribution of direct and reverberant fields

Steady state solution: total energy density function of equivalent absorption area; reverberant field energy density function of room index. Energy density decay, assumption of continuity of the reflections, the Sabine equation for T60. The energy density of the hypothesis of discontinuity reflections: Eyring equation for T60. SPL Difference, normalized value.

Acoustic human perception: phone diagram and A-scale correction for dBA. Sound Levels

Building Acoustics:  Buildings sound protection; impact sound and air born sound; noise from HVAC systems.

Design of sound protections from outdoor  and indoor air borne sound, from impact sound.

Room sound quality: sound absorption, measurement of sound absorption: impedance tube , reverberant room, Rating of sound absorption, sound absorption systems, Helmholtz Resonators and hollowed panels

Geometrical acoustics:  reflection, diffraction and diffusion. Sound diffusers, acoustic mirrors.

Geometrical Room Acoustic: fundamentals

Modelling Room Acoustics performance

Room acoustics design principles.


Prerequisiti

In-depth knowledge of Calculus and linear algebra are required, with reference to complex numbers, derivatives, integrals, ordinary and partial derivatives equations, and matric operations. Knowledge of continuum mechanics basic principia and constitutive laws is warmly advised.


Modalità di valutazione

Final written and oral examination on the main course topics.  In the written examination, the student has to answer to four open questions aiming to assess the ability of:

  • understanding and analysing acoustic phenomena;
  • understanding and analysing basic acoustic phenomena in buildings;

Correction and discussion on the written answers constitute the oral examination.


Bibliografia

Forme didattiche
Tipo Forma Didattica Ore di attività svolte in aula
(hh:mm)
Ore di studio autonome
(hh:mm)
Lezione
32:30
48:45
Esercitazione
17:30
26:15
Laboratorio Informatico
0:00
0:00
Laboratorio Sperimentale
0:00
0:00
Laboratorio Di Progetto
0:00
0:00
Totale 50:00 75:00

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
Disponibilità di materiale didattico/slides in lingua inglese
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese
Disponibilità di supporto didattico in lingua inglese
schedaincarico v. 1.6.5 / 1.6.5
Area Servizi ICT
27/09/2020