| Subject name (in Hungarian, in English) | Technical Acoustics and Noise Control | |||
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Technical Acoustics and Noise Control
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| Neptun code | BMEGEÁTBG15 | |||
| Type | study unit with contact hours | |||
| Course types and number of hours (weekly / semester) | course type: | lecture (theory) | exercise | laboratory excercise |
| number of hours (weekly): | 2 | 0 | 1 | |
| nature (connected / stand-alone): | - | - | individual | |
| Type of assessments (quality evaluation) | exam | |||
| ECTS | 3 | |||
| Subject coordinator | name: | Dr. Suda Jenő Miklós | ||
| post: | adjunct | |||
| contact: | suda.jeno.miklos@gpk.bme.hu | |||
| Host organization | Department of Fluid Mechanics | |||
| http://www.ara.bme.hu | ||||
| Course homepage | http://www.ara.bme.hu/oktatas/tantargy/NEPTUN/BMEGEATBG15/ | |||
| Course language | hungarian, english | |||
| Primary curriculum type | mandatory | |||
| Direct prerequisites | Strong prerequisite | BMEGEÁTBG11 | ||
| Weak prerequisite | ||||
| Parallel prerequisite | ||||
| Milestone prerequisite | at least obtained 0 ECTS | |||
| Excluding condition | BMEGEÁTBG05, BMEGEÁTMKK3 | |||
Aim
The aim of the course is to present a description of phonological phenomena. To prepare students to perform basic acoustic and noise protection design and measurement tasks in mechanical engineering practice. With the acquired knowledge, students will be able to recognize simple engineering technical acoustic and noise reduction problems and solve tasks, perform simple noise protection planning and measurement tasks, and be able to independently develop their acoustic knowledge to solve more complex tasks. The knowledge of the subject lays the foundation for the successful completion of the master's level acoustics subjects.
Learning outcomes
Competences that can be acquired by completing the course
Knowledge
The student knows the subject of acoustics, the division of fields, the concept of sound, its dual nature, and the phenomena and sound that indicate this in different mediums, as well as as a function of frequency and effective sound pressure. The student knows the linear relationship between the variables describing the sound field, the mathematical and physical consequences of linearity, the speed of sound, the homogeneous acoustic wave equation. The student knows the general plane wave solution of the wave equation in free space, the trigonometric and exponential forms of harmonic waves, the solution of the wave equation in finite space, organ pipe and room eigen-frequencies. The student recalls the similarity of sound fields, the determination of the Helmholtz number from the similarity numbers of fluid mechanics, the important composition of harmonic waves, the concept of standing wave and beat. The student recalls acoustic resonators and their fields of application, critical frequency of Helmholtz resonator, harmonic analysis, sound spectrum, octave and third band resolution, concepts of pitch, tone, consonance and dissonance. The student recalls the energetic conditions in acoustics, volumetric sound energy density, sound intensity, sound power, effective sound pressure quantities, description with levels, operations with levels. The student is informed about the spherically symmetric sound field, monopole, dipole, longitudinal and lateral quadrupole sound sources, and acoustic source model laws. The student knows the description of sound propagation in free space, the far-field approximation of sound sources, the loss processes of sound waves in air, and the meteorological events influencing sound propagation. The student is informed with respect to the description of sound propagation across a medium boundary in the case of perpendicular and oblique incidence, transmission loss of single-layer walls, with parts controlled by stiffness, damping and mass, resonance and coincidence frequencies. The student is aware of the description of sound propagation processes in channels, higher modes, the acoustic effects of sudden channel cross-section change, sudden tube termination, exponential horn, expansion chamber, side branch resonator. The student is familiar with the calculation of sound fields with an energetic acoustic approach, the concept of direct and reflected sound field, the equivalent absorption area, the concepts of room constant and reverberation time. The student is aware of the subject of noise protection, the effect of noise on the human body, the meaning of subjective acoustic metrics, the general methodological principles of noise protection, the way of reducing noise of mechanical / fluid mechanical / thermal origin. The student has knowledge of noise abatement methods for free and bounded spaces and individual noise protection devices. The student has knowledge of acoustic measuring instruments, microphones, analyzers, the use of calibrators, the characteristics of an un-echoic room and a reverberation chamber, the determination of on-site noise exposure and the sound power of equipment. The student names the single value characteristics of sound propagation, the concepts of transmission loss, noise reduction, insertion loss and impedance.
Ability
Able to solve simple engineering tasks in the field of technical acoustics. Able to perform simple noise protection design and measurement tasks. Able to further develop his knowledge of acoustics to solve more complex tasks. The student interprets the similarity of sound fields, the determination of the Helmholtz number from the similarity numbers of fluid science, the characteristic complex harmonic waves, the concept of standing wave and floating. The student identifies acoustic resonators, critical frequency of Helmholtz resonator, areas of application, harmonic analysis, tone spectrum, octave and third band resolution, concepts of pitch, tone, consonance and dissonance. The student evaluates the energetic conditions in acoustics, the volume sound energy density, sound intensity, sound power, effective sound pressure quantities, the level of writing, operations with levels, the concept of sound propagation, inhibition, noise reduction. The student interprets the characteristics of the spherically symmetric sound field, monopole, dipole, longitudinal and lateral quadrupole sound sources, and acoustic source model laws. The student interprets the description of sound propagation in free space, the remote approximation of point and line-like sound sources, the loss processes of sound waves in different materials, and the meteorological events influencing outdoor sound propagation. The student defines the description of sound propagation across a fluid boundary in the case of perpendicular and oblique falls, sound insulation of single-layer walls, with parts controlled by stiffness, damping and mass, resonance and coincidence frequencies. The student outlines the description of sound propagation processes in channels (higher modes, sudden channel cross-section change, sudden tube termination, exponential funnel, expansion drum, side branch resonator with acoustic effects). The student calculates sound fields with an energetic acoustic approach (knowledge of direct and reflected sound field, equivalent absorption surface, room constant and reverberation time). The student analyzes the subject of noise protection, the effect of noise on the human body, the meaning of subjective acoustic metrics, the general methodological principles of noise protection, noise of mechanical / fluid mechanical / thermal origin, and the way to reduce them. The student identifies noise reduction methods for free and confined spaces, and individual noise protection devices, acoustic measuring devices, microphones, analyzers, and calibration equipment important in mechanical engineering. The student distinguishes between the characteristics of a deaf room and a reverberation area, the tools required to determine the on-site noise load and the sound power of equipment. The student identifies the one-dimensional characteristics of sound propagation, the concepts of sound attenuation, noise reduction, insertion loss and impedance.
Attitude
The student initiates collaboration with the instructor and fellow students to expand knowledge. The student expands his knowledge with the continuous acquisition of knowledge and a wide-ranging attitude. The student is open to the in-depth use of modern information technology tools. The student seeks to learn about and routinely use the tools needed to solve fluid flow problems. The student strives for an independent, accurate, error-free and responsible solution. The student strives to apply the principles of reliable operation, productivity, cost and time efficiency, energy efficiency and environmental awareness in solving flow engineering tasks. The student develops the ability to align ethical engineering attitudes and long-term win-win considerations with market competition.
Independence and responsibility
The student independently thinks through the tasks and problems defined in the subject and solves them based on given resources. The student accepts well-founded critical remarks and criticisms. In some situations, as part of a team, the student works with your fellow students to solve tasks. The student supports a systematic approach and complex thinking in its thinking. The student is critical of engineering commitments of inadequate quality.
Teaching methodology
Lectures, presentation of the theoretical curriculum with computational examples, supplemented by laboratory exercises, written and oral communication, use of IT tools and techniques, optional independent and group work laboratory measurement tasks. Presentation of theory and numerical examples 14 times a week, two hours a week. Performing simple acoustic measurements in the laboratory exercises, from which a measurement report is prepared.
Support materials
Textbook
Gábor Koscsó: Technical Acoustics and Noise Reduction (electronic textbook), 2021, ISBN
Tamás Lajos: Fundamentals of Fluid Mechanics (in English). 2015, ISBN 978 963 12 2885 4.
A.P. Dowling, J.E. Ffowcs Williams: Sound and sources of sound, Ellis Horwood Limited, 1990, ISBN: 0-85312-400-0
Lecture notes
Gábor Koscsó: Technical Acoustics and Noise Reduction (electronic textbook), 2021, ISBN
Dr. Tibor Szentmártony Dr. Imre Kurutz: Basics of Technical Acoustics, manuscript, Textbook, Budapest, 2005,
note number: J 4-970
Solved Problems and Test Question on “Technical Acoustics and Noise Control”
(http://www.ara.bme.hu/oktatas/tantargy/NEPTUN/BMEGEATBG15/) 2015.
Online material
https://mersz.hu/ (Gábor Koscsó: Technical Acoustics and Noise Reduction (electronic textbook), 2021)
Examples, list of questions: http: // www.ara.bme.hu/oktatas/tantargy/NEPTUN/BMEGEATBG15
Validity of the course description
| Start of validity: | 2025. January 1. |
| End of validity: | 2029. July 15. |
General rules
The assessment of the formulated learning outcomes is based on the participation in the measurements, the measurement protocols and the results of the written and oral exam. The necessary condition for obtaining the signature is to participate in the measurements and to submit the measurement reports separately at least at a sufficient level, by the deadline. If a measurement task is completed correctly, 10 points can be awarded. The sufficient level is 40% of the maximum score, 4 points per protocol. A maximum of 20 points can be obtained during the 2 measurement tasks to be held during the semester. The measurement and the report cannot be replaced afterwards.
Assessment methods
Detailed description of mid-term assessments
| Mid-term assessment No. 1 | ||
| Type: | formative assessment, simple | |
| Number: | 2 | |
| Purpose, description: | The assessment of the formulated learning outcomes is based on the participation in the measurements, the measurement protocols and the results of the written and oral exam. The necessary condition for obtaining the signature is to participate in the measurements and to submit the measurement reports separately at least at a sufficient level, by the deadline. If a measurement task is completed correctly, 10 points can be awarded. The sufficient level is 40% of the maximum score, 4 points per protocol. A maximum of 20 points can be obtained during the 2 measurement tasks to be held during the semester. The measurement and the report cannot be replaced afterwards. | |
Detailed description of assessments performed during the examination period
Elements of the exam:
| Written partial exam | ||
| Obligation: | mandatory (partial) exam unit, failing the unit results in fail (1) exam result | |
| Description: | The assessment of the formulated learning outcomes is based on the participation in the measurements, the measurement protocols and the results of the written and oral exam. Written performance evaluation (exam part 1): The minimum requirement for the written exam is to complete at least 40% of the maximum score (80 points). In the written exam, the theoretical and practical parts of the curriculum are taken into account. | |
| Oral partial exam | ||
| Obligation: | mandatory (partial) exam unit, failing the unit results in fail (1) exam result | |
| Description: | The assessment of the formulated learning outcomes is based on the participation in the measurements, the measurement protocols and the results of the written and oral exam. Oral Performance Assessment (Exam Part 2): The minimum requirement for the oral exam (rating passed or failed) is to achieve an appropriate rating. In the exam, the theoretical and practical parts of the curriculum are taken into account. A maximum of 15 separate examination points may be awarded for the oral examination. | |
| Inclusion of mid-term results | ||
| Obligation: | mandatory (partial) exam unit, failing the unit results in fail (1) exam result | |
| Description: | Inclusion of mid-year results: A maximum of 20 points can be awarded for the 2 measurement tasks performed during the diligence period. The final grade is determined on the basis of the sum of the scores given for the measurement reports, the written and the oral exam (maximum 100 points). The assessment of the formulated learning outcomes is based on the participation in the measurements, the measurement protocols and the results of the written and oral exam. | |
The weight of mid-term assessments in signing or in final grading
| ID | Proportion |
|---|---|
| Mid-term assessment No. 1 | 100 % |
The condition for signing is that the score obtained in the mid-year assessments is at least 40%.
The weight of partial exams in grade
| Type: | Proportion |
|---|---|
| Written partial exam | 80 % |
| Oral partial exam | 15 % |
| Inclusion of mid-term results | 20 % |
Determination of the grade
| Grade | ECTS | The grade expressed in percents |
|---|---|---|
| very good (5) | Excellent [A] | above 90 % |
| very good (5) | Very Good [B] | 85 % - 90 % |
| good (4) | Good [C] | 70 % - 85 % |
| satisfactory (3) | Satisfactory [D] | 55 % - 70 % |
| sufficient (2) | Pass [E] | 40 % - 55 % |
| insufficient (1) | Fail [F] | below 40 % |
The lower limit specified for each grade already belongs to that grade.
Attendance and participation requirements
Must be present at at least 70% (rounded down) of lectures.
At least 85% of laboratory practices (rounded down) must be actively attended.
Special rules for improving, retaken and replacement
The special rules for improving, retaken and replacement shall be interpreted and applied in conjunction with the general rules of the CoS (TVSZ).
| Can the submitted and accepted partial performance assessments be resubmitted until the end of the replacement period in order to achieve better results? | ||
| yes | ||
| Taking into account the previous result in case of improvement, retaken-improvement: | ||
| out of multiple results, the best one is to be taken into account | ||
| The way of retaking or improving a partial assessment for the first time: | ||
| partial assesment(s) in this group can be improved or repeated once up to the end of the repeat period | ||
| Completion of unfinished laboratory exercises: | ||
| missed laboratory practices must be performed in the teaching term at pre-arranged appointment | ||
| Repetition of laboratory exercises that performed incorrectly (eg.: mistake in documentation) | ||
| incorrectly performed laboratory practice (e.g. Incomplete/incorrect report) can be corrected upon improved re-submission | ||
Study work required to complete the course
| Activity | hours / semester |
|---|---|
| participation in contact classes | 42 |
| preparation for laboratory practices | 14 |
| elaboration of a partial assessment task | 8 |
| exam preparation | 21 |
| additional time required to complete the subject | 5 |
| altogether | 90 |
Validity of subject requirements
| Start of validity: | 2025. January 1. |
| End of validity: | 2029. July 15. |
Primary course
The primary (main) course of the subject in which it is advertised and to which the competencies are related:
Mechanical engineering
Link to the purpose and (special) compensations of the Regulation KKK
This course aims to improve the following competencies defined in the Regulation KKK:
Knowledge
- Student is familiar with the general and specific mathematical, scientific and social principles, rules, contexts and procedures needed to operate in the field of engineering.
- Student has the comprehensive knowledge of global social and economic processes.
- Student has the knowledge of the theories and contexts of fundamental importance in the field of engineering and of the terminology which underpins them.
Ability
- Student has the ability to apply the general and specific mathematical, scientific and social principles, rules, relationships and procedures acquired in solving problems in the field of engineering.
- Student has the ability to apply the theories and related terminology in an innovative way when solving problems in a given field of engineering.
- Student has the ability to approach and solve specific problems within student's field of specialisation in a multi-disciplinary and interdisciplinary manner.
Attitude
- Student is open and receptive to learning, embracing and authentically communicating professional, technological development and innovation in engineering.
- Student embraces the professional and ethical values associated with the technical discipline.
- Student seeks to contribute to the development of new methods and tools in the field of engineering. A deepened sense of vocation.
Independence and responsibility
- Student shares her acquired knowledge and experience through formal, non-formal and informal information transfer with those in her field.
- Student evaluates the work of student's subordinates and contributes to their professional development by sharing critical comments.
- Student has the ability to work independently on engineering tasks.
Prerequisites for completing the course
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Knowledge type competencies
(a set of prior knowledge, the existence of which is not obligatory, but greatly facilitates the successful completion of the subject) |
none |
|
Ability type competencies
(a set of prior abilities and skills, the existence of which is not obligatory, but greatly contributes to the successful completion of the subject) |
none |