Course detail
Vibration, Noise and Bioacoustics
FSI-RVHAcad. year: 2015/2016
Vibrations and noise are a general accompaniment to all machinery operations. The whole chain encompassing the vibration sources, transfer paths of the structure, noise emitters on the machine surface and ambient acoustic environment needs to be analyzed. Bioacoustics is dealing with human organs and the organs of the other living creatures, whose function is connected to use of acoustic waves generally on using of acoustics. Bioacoustics is dealing especially with the human voice production and hearing perception.
Basic areas of examination:
Acoustic variables, wave equation and its solution, spectra of vibro-acoustic quantities, acoustic properties of open and closed spaces, mechanical and aerodynamical sound sources.
Experimental analysis of acoustic variables, identification of sources of vibrations and noise.
Passive and active methods of noise reduction.
Vibroacoustic systems of machines - deterministic models (finite element method FEM, boundary element method BEM), statistical models (statistical energy analysis SEA), hybrid models (FEM + SEA).
Biomechanics of the human voice and hearing.
Language of instruction
Number of ECTS credits
Mode of study
Guarantor
Learning outcomes of the course unit
Prerequisites
acoustic wave, acoustic quantities (pressure, intensity, power), acoustic signal spectra, experimental analysis of the acoustic quantities, acoustic fields, spectral and modal properties of acoustic cavities.
Mathematics:
matrix algebra, linear algebra, differential equations, basics of finite element method.
Co-requisites
Planned learning activities and teaching methods
Assesment methods and criteria linked to learning outcomes
The claims for accreditation:
100 % attendance on the exercises. In case of the orderly excused absence is necessary to solve a alternate problem. Accreditation is carried out by means of the written test at the term end. The test consists of ten questions covered the most important areas of the course. A correct answer to less than half of the questions is cause not to give the accreditation. At the end of the semester, each student must submit the required number of resolved dynamic problems.
Participation on the exercises is compulsory. Head of exercises carry out continuous check of student’s presence, their activity and fundamental knowledge. A not excused presence in the exercise is a reason not to give the accreditation.
Definite form of the fulfilment of these claims defines the head of exercises in the term begin.
Course curriculum
2. Spectra of acoustic variables : band pass, tracking,
multispectra
3.Acoustic properties of a closed areas
4.-5. Biomechanics of a human voice and hearing
6.Experimental identification of machine acoustic power
7.Aerodynamic noise sources, principles and examples
8.Passive methods of vibration and noise reduction
9.Principle of reactive dampers of pipe systems
10-11.Deterministic models of vibroacoustic machine systems:
- the coupling structure of vibroacoustic machine systems
- the methods of solution (FEM and BEM)
12-13. Statistical models of vibroacoustic systems (method SEA)
Work placements
Aims
Specification of controlled education, way of implementation and compensation for absences
Recommended optional programme components
Prerequisites and corequisites
Basic literature
Nový, R.: Hluk a chvění, České vysoké učení technické, Praha, 2009 (CS)
Titze, I. R., Alipour, F.: The Myoelastic Aerodynamic Theory of Phonation, National Center for Voice and Speech, Denver and Iowa City, 2006 (EN)
Recommended reading
Lyon, R. H., DeJong, R.G: Theory and Application of Statistical Energy Analysis, Butterwortth-Heinemann, Boston, 1995 (EN)
Mišun, V.: Vibrace a hluk, Vysoké učení technické, Brno, 1998 (CS)
Ohayon, R., Soize, C.: Structural Acoustic and Vibration, Academic Press, London, 1998 (EN)
Rossin, T. D., editor: Springer Handbook of Acoustics, Springer, Würzburg, 2007 (EN)
Classification of course in study plans
Type of course unit
Lecture
Teacher / Lecturer
Syllabus
2. Linear and decibel representation, spectra of acoustic variables: band, tracking, multispectra
3. Acoustic properties of open and closed spaces
4. Mechanical and aerodynamical sound sources - principles and examples
5. Biomechanics of human voice production
6. Biomechanics of human voice – vocal folds and their functions
7. Biomechanics of a human hearing
8. Psychoacoustic noise criteria
9. Experimental identification of acoustic variables
10. Passive and active methods of vibration and noise reduction
11. Deterministic models of vibroacoustic systems: Finite element method (FEM)
12. Deterministic models of vibroacoustic systems: Boundary element method (BEM)
13. Statistical models of vibroacoustic systems (statistical energy analysis SEA), hybrid models (FEM + SEA)
Computer-assisted exercise
Teacher / Lecturer
Syllabus
2. Spectral and modal properties of cavities
3. Acoustic wave propagation in open space, acoustic sources
4. Vocal tract organ, spectral and modal properties
5. Vocal folds and their functions
6. Experimental analysis of voice, formants of vowels
7. Human ear: computer modeling
8. Noise source identification, acoustic emitters
9. Acoustic power emitted by the machine
10.-11. Modeling of vibroacoustic systems using FEM
12. Statistical models, modeling using the SEA
13. Credit