A tantárgyleírás hatályossága
Hatályosság kezdete:
2026. March 21.
Hatályosság vége:
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| Subject name (Hungarian, English) |
Műszaki akusztika
Engineering Acoustics
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| Subject code | BMEVIHIMA11 | ||||||||||||
| Subject type | — | ||||||||||||
| Training Level | — | ||||||||||||
| Course types and hours (weekly/semester) |
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| Assessment type | vizsga | ||||||||||||
| Credits | 4 | ||||||||||||
| Subject coordinator |
DR. Fiala Péter
position: egyetemi docens
contact:
fiala.peter@vik.bme.hu
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| Responsible department |
Hálózati Rendszerek és Szolgáltatások Tanszék
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| Faculty | Villamosmérnöki és Informatikai Kar | ||||||||||||
| Subject website | — | ||||||||||||
| Primary curriculum type | — | ||||||||||||
| Direct prerequisites – Strong prerequisite | none | ||||||||||||
| Direct prerequisites – Weak prerequisite | none | ||||||||||||
| Direct prerequisites – Parallel prerequisite | none | ||||||||||||
| Direct prerequisites – Milestone prerequisite | none | ||||||||||||
| Direct prerequisites – Exclusion | none |
Objectives
Programme
Lectures
1. Basic notions of acoustics: descriptors of airborne sound (sound pressure and particle velocity), logarithmic quantities (notion of decibels and applications). The wave equation of sound, solution for plane and spherical waves.
2. Further characteristics of sound fields: the notion of acoustic impedance, acoustic intensity and specific impedance and their relationships.
3. One-dimensional modelling of acoustic systems. Lumped parameter elements: acoustic mass, acoustic capacity and acoustic resistance.
4. Longitudinal vibrations of rods, solution of the wave equation for low frequencies. Mechanical lumped parameter elements: spring, mass and resistance.
5. Acousto-mechanical-electrical analogies and their applications. Potential, limitations and application possibilities of concentrated parameter vibro-acoustic models.
6. Elementary radiators in acoustics: point source, line source and plane source. Notions, characteristics and calculations. Importance and calculation of the radiation impedance.
7. Electromechanical transducers. The electrodynamic transducer: construction , operation, characteristics and calculation.
8. Basic notions of speakers, their characterization and synthesis. Application of the most frequently used electrodynamic drivers in various speaker boxes.
9. Construction, operation, main types, characteristics and application of microphones.
10. Principles of sound propagation, reflection and absorption. Predominant parameters, calculation and design of sound insulating elements and systems.
11. Basics of room acoustics. Acoustic characteristics of rooms, notion and calculation of sound decay and reverberation.
12. Basic characteristics of condenser microphones, analogue circuit, band limitations. Measurement of very low sound pressures, noise analysis.
13. Methods and tools of sound intensity measurements, based on the pressure gradient and of the Microflown particle velocity sensor principle. Analysis of accuracy of various methods.
14. Sound pressure level meters, acoustic analyzers. Measuring methods of frequency response functions.
Exercises
1. Demonstrations of various sound fields. Calculation examples to shed light into the relationships of sound field characteristics.
2. Simple calculations with lumped parameter acoustic models, application for a Helmholtz resonator (for example, what is the operating mechanism of the special bottle of the Hungarian whistling abricot brandy?).
3. Application of analogies for simple dimensioning problems in vibro-acoustics, noise and vibration control.
4. Synthesis of sources by using superposition of elementary sources, demonstration of radiation problems. (Example: how can the annoyance caused by the Sziget Festival in Óbuda and Angyalföld be reduced?)
5. Calculation of the frequency response of a transducer. (What kind of speaker should I buy?)
6. Aspects of selection of condenser measuring microphones. Calibration methods of microphones.
7. Practical aspects of intensity measurements. Application of acoustic analyzers for the measurements of microphones and speakers.
1. Basic notions of acoustics: descriptors of airborne sound (sound pressure and particle velocity), logarithmic quantities (notion of decibels and applications). The wave equation of sound, solution for plane and spherical waves.
2. Further characteristics of sound fields: the notion of acoustic impedance, acoustic intensity and specific impedance and their relationships.
3. One-dimensional modelling of acoustic systems. Lumped parameter elements: acoustic mass, acoustic capacity and acoustic resistance.
4. Longitudinal vibrations of rods, solution of the wave equation for low frequencies. Mechanical lumped parameter elements: spring, mass and resistance.
5. Acousto-mechanical-electrical analogies and their applications. Potential, limitations and application possibilities of concentrated parameter vibro-acoustic models.
6. Elementary radiators in acoustics: point source, line source and plane source. Notions, characteristics and calculations. Importance and calculation of the radiation impedance.
7. Electromechanical transducers. The electrodynamic transducer: construction , operation, characteristics and calculation.
8. Basic notions of speakers, their characterization and synthesis. Application of the most frequently used electrodynamic drivers in various speaker boxes.
9. Construction, operation, main types, characteristics and application of microphones.
10. Principles of sound propagation, reflection and absorption. Predominant parameters, calculation and design of sound insulating elements and systems.
11. Basics of room acoustics. Acoustic characteristics of rooms, notion and calculation of sound decay and reverberation.
12. Basic characteristics of condenser microphones, analogue circuit, band limitations. Measurement of very low sound pressures, noise analysis.
13. Methods and tools of sound intensity measurements, based on the pressure gradient and of the Microflown particle velocity sensor principle. Analysis of accuracy of various methods.
14. Sound pressure level meters, acoustic analyzers. Measuring methods of frequency response functions.
Exercises
1. Demonstrations of various sound fields. Calculation examples to shed light into the relationships of sound field characteristics.
2. Simple calculations with lumped parameter acoustic models, application for a Helmholtz resonator (for example, what is the operating mechanism of the special bottle of the Hungarian whistling abricot brandy?).
3. Application of analogies for simple dimensioning problems in vibro-acoustics, noise and vibration control.
4. Synthesis of sources by using superposition of elementary sources, demonstration of radiation problems. (Example: how can the annoyance caused by the Sziget Festival in Óbuda and Angyalföld be reduced?)
5. Calculation of the frequency response of a transducer. (What kind of speaker should I buy?)
6. Aspects of selection of condenser measuring microphones. Calibration methods of microphones.
7. Practical aspects of intensity measurements. Application of acoustic analyzers for the measurements of microphones and speakers.
The aim of the subject is to get acquainted the students with the basic principles of acoustics, especially of technical acoustics, and their internal relationships; to present the processes taking place in acoustic systems; and to hand over the basic knowledge required for practical applications, measurements and acoustic design. The core of the subject is the field of audio, with special regard to acoustic transducers, their analysis and synthesis. Next to the physical principles of sound generation and recording, other subjects such as room acoustics as well as the control and reduction of airborne and structure-borne sound is also concerned. The subject forms the basis of successful acquirement of other subjects of the Minor Audio and Studio Technologies.
Learning outcomes
Ez a tantárgy a KKK rendeletben meghatározott, következő kompetenciák fejlesztését szolgálja:
Knowledge
No learning outcomes recorded.
Skills
No learning outcomes recorded.
Attitudes
No learning outcomes recorded.
Autonomy and responsibility
No learning outcomes recorded.
Oktatási módszertan
Lectures and excercises, consisting of many demostrations.
Tanulástámogató anyagok
Online források
F. Fahy: Foundations of engineering acoustics. Academic Press, London, 2000.
Recommended preliminary knowledge for completing the subject
Knowledge type competencies
(azon előzetes ismeretek összessége, amelyek megléte nem kötelező, de a tantárgy eredményes teljesítését nagyban elősegíti)
Mathematics, Physics
Skill type competencies
(azon előzetes képességek és készségek összessége, amelyek megléte nem kötelező, de a tantárgy eredményes teljesítését nagyban elősegíti)
nincs
Recommended (non-compulsory) preliminary competencies
(azon ajánlott (nem kötelező) előzetesen megszerzendő kompetenciák összessége, amelyek jelentősen hozzájárulnak a tantárgy eredményes teljesítéséhez)
Mathematics, Physics
General rules
Requirements:
a. A szorgalmi időszakban:
Successful (grade 2) fulfilment of a written examination (NZH).
b. A vizsgaidőszakban:
Oral exam.
c. Early exam is possible in the substitution period (first week after the lectures).
Additional possibilities:
In case of insufficient grade or missing of the written examination :
1 substitute written examination in the lecture weeks, 1 extra substitute written examination in the substitution period (first week after the lectures).
Assessment methods
In-term assessments
No detailed assessments provided.
Weight of in-term assessments
No weights provided.
Exam-period assessments
No detailed assessments provided.
Weight of exam elements
No weights provided.
Grade calculation
No grade thresholds provided.
Attendance requirements
No attendance requirements provided.
Rules for retake and resubmission
Not provided.
Short description
Not provided.
Detailed description
Not provided.
Recommended courses
Not provided.
Workload to complete the subject
No workload breakdown provided.
Validity of subject requirements
Requirements valid from:
—
Requirements valid until:
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Curriculum placement
No curriculum placements recorded for this subject version.