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Structural mechanics

Simulation of Sound Propagation in Acoustics


Training eLearning Expert

Learn how to solve simulation tasks for room acoustics, absorption, sound transmission, sound radiation and fluid-structure interaction. This training is offered as a 3-day course or alternatively as a self-paced eLearning course.

3 days

Basic knowledge of Ansys Mechanical

Software used
Ansys Mechanical

  • Simulate acoustic applications from engineering practice using FEM
  • Investigate sound propagation and sound radiation of vibrating components
  • Understand influencing parameters to reduce sound radiation
  • Simulate measures for noise reduction in the concept phase


In the training, you will acquire the practical skills to simulate acoustic applications from engineering practice using FEM. Through the use of Ansys Mechanical, you will not only simulate the structural-mechanical vibration of engines, but also the sound that they generate.

After a brief introduction to the physical principles of technical acoustics, you will learn the most important aspects of modeling and solution settings working with classical tasks from the field of room acoustics with reverberant and absorbent boundaries. Complex systems are often sources of disruptive noise. This seminar teaches the fundamentals in order to better understand noise origination and noise radiation in motors, machines and systems. You will derive design criteria to ensure compliance with legal regulations and noise protection thresholds, thus exciting your customers with quieter products! The simulation of Fluid-Structure-Interaction (FSI) can demonstrate, for example, how the additional hydrodynamic mass of resonant water is represented with high precision with Ansys Mechanical acoustic elements will round out the training.

This course is aimed at project managers, calculation engineers and designers who would like to better understand vibro-acoustic matters in product development at an early stage using simulation technology in order to derive solution concepts to improve the acoustic performance.

Test the first module for 30 days free of charge

Get a first impression and test the first eLearning module of this training course without any obligation. No costs, no notice period.

Detailed agenda for this 3-day training

Day 1

01 Physical principles of technical acoustics

  • Properties of sound waves
  • Sound field variables: sound pressure, velocity, sound power
  • Overlapping of sources
  • Differentiation between airborne and structure-borne sound
  • Sound samples

02 Low-frequency room acoustics

  • Basic linear acoustics equation
  • Modeling, element selection and meshing
  • Acoustic boundary conditions and loads
  • Acoustic material parameters
  • Evaluating sound field variables
  • Exercise: Calculating cavity resonances
  • Exercise: Calculating frequency responses at microphone points
  • Exercise: Introduction to simple absorption properties

03 High-frequency room acoustics

  • Distinction from modal acoustics
  • Properties of a diffuse sound field
  • Defining the reverberation time
  • Demo: Calculating the diffuse sound field in a room

04 Measurement and simulation of porous, sound-absorbing media

  • Modeling porous, sound-transmitting media
  • Frequency-dependent materials
  • Measuring absorption properties
  • Absorption coefficient for vertical or diffuse cases of sound incidence
  • Exercise: Determining the degree of absorption in Kundt’s tube

Day 2

05 Machine acoustics and structure-borne sound

  • Properties of waves in solids
  • Basic machine acoustic equation
  • Structure-borne sound as a quick assessment criterion
  • Exercise: Vibration analysis of a plate
  • Transfer function – skillful handling of load variations

06 From anechoic chamber to acoustic free field

  • What is an acoustic free field?
  • Boundary conditions in Ansys: Absorbing Elements and Perfectly Matched Layers
  • Best practice for model development and networking
  • Use of analytical sources: Monopoles, dipole
  • Analysis settings and solver selection
  • HPC: Efficient handling of numerically large models
  • Elegant acoustic postprocessing: Free-field microphones outside the FE network
  • Exercise: Sound radiation of a spherical cap (~Loudspeaker)

07 Structure-borne sound, airborne sound and radiation level

  • Exercise: Sound radiation of a vibrating train wheel
  • Inefficient and efficient sound emitters
  • Coincidence frequency and radiation level
  • Exercise: Comparison of structure-borne and airborne sound power of a vibrating plate
  • Exemplary sound radiation of a pump

08 Calculation of acoustic waveguides

  • What is an acoustic waveguide?
  • What additional functions does Ansys offer?
  • Determination of acoustic power
  • Efficient modeling of perforated plates
  • Influence of temperature and flow velocity on sound propagation
  • Description of thermo-viscous losses in thin columns and tubes
  • Exercise: Calculation of an exhaust silencer
  • Demo: Calculation of a thermo-viscous resonator

Day 3

09 FSI simulation of heavy, enclosed fluids

  • Energy consideration with coupled analyses
  • Consideration of free surfaces and sloshing (linear)
  • Exercise: Coupled modal analysis of a fluid filled tank
  • Exercise: Coupled frequency response of a fluid filled tank

10 FSI simulation of submerged structures

  • Coupled equations of Fluid-Structure interaction (FSI)
  • Strong coupling for heavy fluids and/or light structures
  • Best Practice Modeling for FSI with Ansys Mechanical
  • Exercise: Coupled modal analysis of a ship

11 Acoustic simulation in the time domain

  • Selecting element size and time step
  • Physical and numerical dispersion
  • Estimating the computing effort
  • Suitable models and tasks
  • Making simulation “audible”: Hearing sound pressure results
  • Demo: transient calculation of a tuning fork
  • Exercise: Simulating a distance sensor

12 Acoustic excitation of structures

  • Introduction into aeroacoustics
  • Design guidelines for Low-Noise Machines
  • Basic idea of automated comparison between simulation and measurement
  • Exercise: Acoustic Destruction of a Wineglass
  • Sound transmission: Transmittance and sound reduction index
  • Exercise: Simulating the sound reduction index on a window test bench

Your Trainers

Mike Feuchter
CAE Engineer, CADFEM Germany GmbH, Stuttgart
Dr.-Ing. Marold Moosrainer
Head of Professional Development, CADFEM Germany GmbH, Grafing
Mohamed Jegham
Engineering Services, CADFEM Germany GmbH, Grafing

Placement in the CADFEM Learning Pathway

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Test the first module for 30 days free of charge

Get a first impression and test the first eLearning module of this training course without any obligation. No costs, no notice period.

Not the right offer or date?

Whether eLearning, classroom courses, live online training or customized workshops - together we identify the best option for you.

Do you have questions on the training or the eLearning?

When will I receive the final confirmation for my training booking?

Straight after you sign up, an automatic confirmation of receipt will be sent to the email addresses you provided. Once you have successfully verified the data you provided, you will receive your personalized sign-up confirmation, containing further information on course fees, the billing address, etc., by email within two to three working days.  

As soon as the minimum number of attendees has been reached, you will receive a final training confirmation containing further information. If you have booked an on-site training, we recommend that you wait until you have received this final confirmation before booking your travel and accommodation.

If the minimum number of attendees is not reached, we reserve the right to cancel the training seven days before it is due to start at the latest. We are happy to inform you on changing your booking to an alternative date. Please note that we accept no liability for hotel or travel bookings that attendees have already made.

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Training places will generally be allocated based on the order in which attendees sign up. For this reason, we always recommend booking for your desired date as early as possible.

As long as a coures still has free places, it can be booked.

At what time do the training courses begin and end?

Usually the training courses start at 9:00 am and end at 5:00 pm of the respective local time. The actual course times will be stated in the booking confirmation. Please note that, depending on the training host, there may be a possible time shift between your and the provider's local time. Therefore all local times are provided with the valid time shift to Greenwich Mean Time (GMT). 

Can I test the eLearning offer without obligation?

To get a clear impression of our online learning format, we offer you a trial allowing you access to the starting module of an eLearning course of your choice. No costs, no cancellation period or anything similar. Moreover, with this free test access you can check all the technical requirements for a smooth learning process. You can easily request the free module from any eLearning course.

How much time should I allow for an eLearning course?

Each online course day comprises four eLearning modules. You should ideally allow 90 to 120 minutes of uninterrupted learning time for each module. This will allow you to acquire the knowledge provided by a module and to consolidate it through quiz questions and Ansys exercises. By dividing each module into micro learning units, you can also make good use of smaller time windows, such as on your commute.

For how long can I access the learning content?

Prerequisite for the use of the eLearning courses is the use of a personalized access to the CADFEM learning platform. When purchasing an eLearning course, access to the learning platform is 365 days. As a subscription user, access to the learning platform starts and ends with the start and end of the flat rate. With the start of a further learning product (Learning Subscription, training, eLearning), access to your content is extended by 365 days.

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