TECHNICAL ACOUSTICS
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- Versione italiana
- Academic year
- 2022/2023
- Teacher
- CHIARA VISENTIN
- Credits
- 9
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/11
Training objectives
- This course aims to provide the student with the knowledge required to carry out different activities in the field of applied acoustics and noise control engineering: in particular, within the fields of building and room acoustics, environmental acoustics, noise exposure in working places, and noise control engineering. The course provides students with tools and fundamental knowledge to:
- undertake acoustic analyses through prediction computations and experimental measurements,
- design acoustically comfortable buildings and carry out acoustic testing in buildings,
- carry out measurements in the outdoor environment and assessments of acoustic impact,
- design acoustic mitigations and treatments for noise reduction,
- design concert and speech halls, and analyze and assess their acoustic quality. Prerequisites
- As a prerequisite, students are required basic knowledge of the fundamentals of acoustics and sound propagation in free field and in confined environments:
- sound sources, sound acquisition, and basic signal processing;
- physical quantities and acoustic descriptors or parameters used in practice;
- sound propagation in the external environment (free field propagation);
- the acoustics of indoor spaces, concepts of reverberation, and sound pressure levels;
- mechanism of sound transmission (and insulation), absorption, and reflection;
- the basic principles for the measurement of sound. Course programme
- The course comprises 90 hours of lectures, classroom exercises, and laboratory workshops.
- Recalls of the basic concepts of the acoustic phenomenon, acoustic quantities, sound pressure levels, sound spectra, weighting filters, sound propagation in free-field conditions, and confined spaces.
- Theory of sound propagation in dissipative materials, Concepts of surface impedances and characteristics impedances. Characterization and modelling of fibrous and porous materials.
- Fundamentals of vibro-acoustics: sound radiation and transmission.
- Advanced room acoustics: sound propagation and perception in confined spaces. Model for acoustic communication in rooms and halls. Impulse response and acoustic descriptors for the assessment of the acoustic quality of halls for speech and music.
- Acoustic modeling and simulation. Introduction to prediction methods for environmental, building, and room acoustics and noise control engineering.
- Sound quality fundamentals: psychoacoustic metrics, subjective assessments, and definition of prediction models.
- Recalls of measuring instruments and signal processing. Theory of measurement of the fundamental acoustic quantities and descriptors (e.g., pressure, intensity, reverberation time). Laboratory workshop to carry out experimental tests, learning to use the instrumentation and acquisition software (e.g., acoustic intensity and sound power measurements, sound insulation and absorption measurements, impulse response and reverberation time measurements) and analyze and process measured data.
- Environmental acoustics legislation and regulation: assessment of environmental noise and acoustic impact evaluation ((e.g., transportation noise, industrial noise). Criteria for the planning, mitigation, and control of noise emissions. Acoustic classification of the territory.
- Legislation and regulations on buildings’ acoustic performances and requirements and indoor acoustic comfort.
- Noise and vibration in workplaces. Calculation of daily and weekly noise exposure levels.
- Workshops and excises about the design and evaluation of acoustic performances in buildings, through predictions and experimental measurements. Noise prediction in the outdoor environment, design of acoustic barriers and analysis of experimental data. Models and design approaches for indoor spaces for speech or music. Didactic methods
- Teaching will involve face-to-face, streaming, or mixed (in-person and streaming) lectures, practical exercises and measurements in the laboratory or on-site.
In addition to theoretical study, students will prepare technical reports on an assigned topic (subject of examination) for which they will use both provided software and laboratory equipment, working either in small groups or individually, with the support of the teaching tutors. Learning assessment procedures
- Oral examination and discussion the technical report developed during the course.
Reference texts
- Course readings
Manuale di Acustica, a cura di R. Spagnolo, UTET, 2007.
