COMSOL Day: Acoustics (ONLINE)

June 24, 2020 8:30 AM - 4:30 PM CEST

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Join us for a full-day online event with a special focus on acoustics. You will have the opportunity to meet with COMSOL technical staff and customers, engage in product demonstrations, and gain insight into upcoming projects and focuses within acoustics research and industry.

Topics include the analysis of loudspeakers, ultrasound and non-destructive testing (NDT), microacoustics, and room acoustics. We will also address topics like optimization, meshing, and solving of large acoustic models.

During the day you can also join a Tech Café to discuss a given topic or acoustics in general. Engineers from COMSOL will be able to answer your questions and present best practices. Fellow attendees are also free to contribute with their own solution approaches, advice, and observations.

Feel free to invite your colleagues. View the schedule below and register for free today!

Schedule

8:15

Please join us 10 minutes before the presentation starts to settle in and make sure that your audio and visual capabilities are working.

8:30

During this session, you will get an introduction to the latest news and trends in acoustics simulation. We will also briefly discuss some of the future developments and ideas for the Acoustics Module.

9:40
Invited speakers
René Christensen, GN Hearing

Vibroacoustic Simulation and Optimization of Hearing Aids

Hearing aids are complex vibroacoustic systems and inherently require the use of multiphysics to be modeled and simulated. The hearing aid includes a receiver (a microspeaker) as well as one or several microphones. Both acoustic and vibrational feedback paths exist between the two. Via the use of simulations, engineers can better track the effects coming from the different forces, torques, and acoustic pressures, and an optimized design can be found for a given hearing aid situation. This will be demonstrated, as well as some emerging techniques in the field of shape and topology optimization — all kept within the framework of COMSOL Multiphysics® exclusively.

Lars Lindemose, Brüel & Kjær Sound & Vibration Measurement A/S

Diffuse Sound Field

Creating a diffuse sound field in reverberation rooms entails a number of prerequisites, such as multiple sources, careful setup of both equipment and deflecting panels, and subsequently some postprocessing. An attempt to do the same in effectively one go using finite element modeling is presented, and simulated results are compared to real measured values.

10:20
Break
10:35
Parallel Session
Ultrasound & NDT

Get an overview of the capabilities for modeling the propagation of acoustic waves in coupled fluid and solid media in the COMSOL® software. The applications include nondestructive testing (NDT) units, flowmeters, and piezoelectric transducers.

Material Properties

High-fidelity numerical simulations are only achieved if material properties are well described. In acoustics, knowing the damping properties of fluids and structures can be challenging. For porous materials, the challenge may be even higher, as data provided by manufacturers is often sparse. Using COMSOL Multiphysics®, it is possible to estimate your material parameters from experimental measurements through optimization. Moreover, the properties of any gas mixture, like moist air, can be computed from first principles with thermodynamics.

Tech Café: Simulation Apps

Simulation apps enable you to expand your modeling and give more control to your colleagues who require simulations for their designs and processes. You can create user-specific modeling environments that are best suited to their simulation needs while also being easy enough for them to use, even if they are not modeling experts. During this Tech Café, you can discuss how best to develop simulation apps with COMSOL engineers, who will also be answering your specific questions.

11:50
Invited speakers
Martin Olsen, Harman International

Simulation of Sound Field Control Technologies in Automotive Listening Spaces

The future of automotive audio systems is expected to introduce profound changes in both the user's perception of and expectations to transportation, as well as in the physical boundaries of the listening space. To address these new conditions, the investigation of emerging technologies is aided by the mathematical modeling of physics. In this presentation, examples are shown of different aspects of the research approach involving acoustical simulations that come before the technology development process.

Per Christian Sejersbøl Jensen, Audio and Acoustics Ole Wolff Electronics

Practical Applications of COMSOL® in Microspeaker Development and Implementation

In this presentation, Per will give examples of how Ole Wolff is using COMSOL Multiphysics® in application support and transducer design. One way to achieve this is through the use of customized apps created with the Application Builder.

12:30
Break for Lunch
13:00
Parallel Session
Loudspeakers

The virtual multiphysics development, design, and optimization of loudspeakers has reached a very mature state within the last five years. You will learn about the capabilities and latest modeling approaches available in COMSOL Multiphysics®, which will allow you to have a full virtual testing environment.

Microacoustics

Acoustic propagation in structures with submillimeter features is the norm in consumer products like mobile devices, protective grills of loudspeakers, hearing aids, and perforates used in muffler systems. Common to all is that the inclusion of thermoviscous losses is essential to correctly predict the response. You will be introduced to the modeling techniques used to capture these effects in simulations.

Tech Café: Meshing

Generating a mesh is a foundation for simulations, and generating a mesh that is both fine enough to capture the physical phenomenon and give accurate results and computationally efficient is a compromise and requires different meshing techniques. During this Tech Café, you can discuss how best to generate a mesh for your application with COMSOL engineers, who will also be answering your specific questions.

14:15
Invited speakers
Cheol-Ho Jeong, DTU - Technical University of Denmark

Toward Accurate Boundary Modeling in Room Acoustics Simulations

Although many room acoustics simulation methods have been well established, simulation results will never be accurate with inaccurate and inappropriate boundary input data. This talk addresses how we can improve the quality of input data for room acoustics simulations and how much we can improve the accuracy of room acoustics simulations with more accurate boundary modeling, both in geometrical acoustics and wave-based simulations.

Rasmus E. Christiansen, DTU - Technical University of Denmark

Topology Optimization Enables the Design of Intricate Geometries for Acoustic Wave Control

The rigorous engineering of physical systems, such as carefully designing the acoustic components in a microphone, is a cornerstone in the development of new and improved devices.

Present-day engineering solutions often rely on parameter studies and human intuition, both of which have clear limitations, regularly resulting in suboptimal devices. Topology optimization offers an alternative design framework, providing unprecedented design freedom.

In recent years, topology optimization has been integrated into commercial software, e.g., COMSOL Multiphysics®, allowing for topology-optimization-based device design fully inside the framework. This talk discusses how using topology optimization enables the design of nonintuitive intricate geometries for (exotic) acoustic wave propagation control.

14:55
Break
15:10
Parallel Session
Optimization and Product Design

Sensitivity analysis can be used to identify important parameters that can then be changed manually or automatically using optimization. Optimization of these parameters enhances the performance of your product. In the case of manufacturing uncertainties, it is possible to compute several objectives and optimize for the worst of them. You will see several examples of how optimization can be set up in the COMSOL® user interface.

Acoustics Simulation in the Automotive Industry

Simulations are heavily used in many application areas in the automotive industry, ranging from cabin acoustics and muffler design to the vibrational analysis of components in an NVH setting. You will learn how you can use acoustics simulations in these various application areas. The focus will be on multiphysics phenomena like acoustic-structure interaction (ASI) and convected acoustics.

Tech Café: Solving Large Acoustics Models

When solving large acoustics models, it can be beneficial to tune the solvers for performance, stability, or memory consumption. This can, in many cases, be achieved using one of the predefined solver suggestions. The mesh and other options are also important. During this Tech Café, you can discuss how best to set up the solver configuration for your application with COMSOL engineers, who will also be answering your specific questions.

16:10
Closing Remarks

COMSOL Speakers

Thure Ralfs
COMSOL
Thure Ralfs is the managing director of COMSOL's Danish office. Before joining COMSOL in 1997, he worked with various technical software. Thure has an MSc and MBA from the Technical University of Denmark.
Mads J. Herring Jensen
COMSOL
Mads Herring Jensen joined COMSOL in 2011 and is the technical product manager for the Acoustics Module. Before starting at COMSOL, he worked in the hearing aid industry for five years as an acoustic finite element expert. Mads has a PhD in computational fluid dynamics from the Technical University of Denmark.
Andres Garcia
COMSOL
Andres Garcia joined COMSOL in 2019 as a development engineer for the Acoustics Module. Before joining COMSOL, he worked as a simulation expert in various automotive and aerospace companies. Andres holds an MS from the Technical University of Madrid.
Kirill Shaposhnikov
COMSOL
Kirill Shaposhnikov works at COMSOL as a development engineer in the acoustics group. He has a degree in applied mathematics from South-Russian State Polytechnic University and a PhD in mechanical engineering from the Vienna University of Technology. His interests focus on applied mathematics, mathematical physics, and numerical analysis.

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COMSOL Day Details

Invited Speakers

Martin Olsen
Harman International Lifestyle

Martin Olsen is employed as a senior principal engineer, at Harman International - Lifestyle, where he works in the field of automotive acoustical research and technology development. His present research areas include spatial sound field control utilizing arrays of loudspeakers and microphones in the automotive domain, numerical modeling, and virtual acoustics.

René Christensen
GN Hearing

René Christensen is a senior specialist at GN Hearing and holds a PhD in microacoustics in hearing aids. He has worked in the field of computational vibroacoustics for around 15 years with a focus on such products as loudspeakers and hearing aids, but also with a focus on the academic side of the modeling of physical phenomena and collaborating with professors and students in Denmark and internationally. In recent years, he has worked toward making shape and topology optimization more approachable for the industry in general.

Per Christian S. Jensen
Ole Wolf Electronics

Per Christian Sejersbøl Jensen has a background in music production and has been working at Ole Wolff as an engineer since 2014. Ole Wolff is a Danish company that develops microtransducers for headphones, earphones, IoT devices, and various consumer products.

Cheol-Ho Jeong
DTU Elektro

Dr. Cheol-Ho Jeong has been an assistant/associate professor of acoustic technology at DTU Elektro since 2007. His research interest covers computational room acoustics; auditory virtual reality; acoustic metamaterials; and the multimodal perception of sound in spaces, including environmental acoustics.

Lars Lindemose
Brüel & Kjær Sound & Vibration Measurement A/S

Lars Lindemose has worked in the audio industry for 10+ years and has done mathematical modeling of speakers at Analog Devices and audio driver design at Libratone. He presently works with Brüel & Kjær Sound & Vibration Measurement A/S as a development engineer of acoustic transducers.

Rasmus E. Christiansen
DTU

Rasmus E. Christiansen holds a PhD degree (2016) from the Technical University of Denmark (DTU). His PhD fellowship was focused on the development, application, and experimental validation of topology-optimization-based methods for wave propagation problems within acoustics. He currently works as a postdoctoral researcher in the TopOpt group at DTU, where he works on developing and applying simulation-based inverse design tools to wave propagation problems; examples being the design of metallic nanoparticles for enhancing solar cell efficiency (through the SunTune project) and the design of passive photonic structures for optical data processing and terabit communication (through the NATEC project). He recently visited Massachusetts Institute of Technology, where he worked with Professor Steven G. Johnson's group on light-matter interaction problems, treating phenomena such as Raman scattering.