Machine Acoustics

Contact

Berroth, Joerg

Name

Joerg Berroth

Head of Systems Engineering - Modelling and Simulation

Phone

work
+49 241 80 95644

Email

E-Mail
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Content

The "Machine Acoustics and Dynamic Causes" course is offered as an elective subject for students in the Master degree program. This one-semester course pursues the question as to why vibrations can occur in mechanical engineering systems and under what circumstances these are audible to humans. Focus is placed on the basic interrelationships of machine acoustics. This includes in particular a system's excitation or excitability and the transfer and dissipation of sound energy. Examples will be used to discuss relevant problems surrounding acoustics in mechanical engineering and to impart an understanding of the overall acoustic system. Consideration of the options for noise reduction will then finally consolidate the contents of the previous lectures based on a practical example.

Organization

Dates:

  • each summer semester V2/2, SWS 4/ECTS credits 6

Venue:

  • Seminar room at the CWD, Campus-Boulevard 61 (ground floor)

Registration:

The lecture is given by:

Exam Info

  • Oral examination by appointment
  • More detailed information in RWTHmoodle

Lecture Topics

Basic concepts of technical acoustics

  • Sound values, levels
  • Evaluation of sound
  • Calculating using level values
  • Individual perception of sound: psychoacoustics
  • Estimation methods for natural frequencies
  • Considerations both in the time and frequency domains, FFT
  • The chain of acoustic transmission in machinery
Ramp-up Copyright: MSE Ramp-up

Excitation

  • Types of excitation
  • Interlocking excitations
  • Analysis of the vibration behavior in a drivetrain
  • Basics of simulating torsional oscillation / multi-body simulation
Carriers with measurement and carriers with FEM Copyright: MSE carrier measurement, FEM carriers

Structure-borne noise

  • Estimation methods for the structure-borne noise level
  • Measuring structure-borne noise / damping structure-borne noise
  • Transmission paths
  • Modeling structure-borne noise behavior, FEM / SEA
  • Validation, experimental modal analysis

Emission / airborne sound

  • Emission behavior of simple structures
  • Modeling emission behavior, BEM / SEA
  • Measuring sound intensity
  • Metrological sound isolation
Drivetrain Copyright: MSE Drivetrain

System analysis

  • Fundamental opportunities for noise reduction
  • Practical examples of acoustic optimization