promote international cooperation within different specific fields of acoustics, provide assistance in organizing EAA events, suggest special issues for Acta Acustica or Acoustics in Practice, initiate studies and prepare documents such as strategies, policy statements, state-of-the-art assessments, reports, etc, within its defined technical field.

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Fundamentals of Machine Acoustics

Technical University of Darmstadt (TUDa)

Docent
  • Tobias Melz
Type
Lecture
Term
winter semester
Subject type
Elective
Study path
Master Mechanical and Process Engineering (Maschinenbau)
Specialisation/branch
Keywords
Introduction: Motivation, environmental pollution noise, human hearing, harmfulness limits, guidelines, noise assessment (emission and immission limits), noise types. Level calculation: motivation and definition of levels, reference values, level arithmetic, rating levels. Introduction to machine acoustics: vibrations, single-mass oscillator, impedance and admittance, wave equation of the sound field, solution of the wave equation for 1D-, 2D- and 3D-sound fields, types of radiators and laws of propagation (spherical radiator – line radiator – area radiator), reflection and absorption, interference, diffraction, relationship between displacement, vibration velocity, and acceleration. Signal processing: frequency analysis, frequency filter, third octave and octave filters, A-, C- and Z-weighting. Machine Acoustic measurement techniques: transducers, methods of sound power determination: free field method, reverberation field method, reference sound source method, sound intensity method. Fundamental equation of Machine Acoustics and engineering noise control: noise generation in force-excited and velocity-excited machine structures, direct and indirect sound generation, distinction between primary and secondary noise reduction.
Total ECTS credit
6.0
Examination
written exam
Language
Webpage
https://www.sam.tu-darmstadt.de
Last modified
May 2, 2022, 10:15 p.m.

The European Acoustics Association (EAA) is a non-profit entity established in 1992 that includes in its membership societies predominantly in European countries interested in to promote development and progress of acoustics in its different aspects, its technologies and applications. EAA gathers 33 societies of acoustics and serves more than 9000 individual members all over Europe. The European Acoustics Association (EAA) is an Affiliate Member of the International Commission for Acoustics (ICA) and of Initiative of Science in Europe (ISE).

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