APEI Automotive Audio Webinar

Direct Validation of Computational Acoustic Results for Automotive Cabin Simulations

January 19, 2021
9:00 AM Pacific (12:00 PM Eastern)

Overview

Over the last 20 years, Automotive Audio has changed dramatically with the design of true multichannel playback systems fully integrated and adjusted to the specific car. Today some of the most advanced sound technologies are being developed and applied in Automotive Audio. 
Expanding on its mission to furthering the knowledge and skills of professionals involved in audio development, the Audio Product Education Institute (APEI) will promote a new online event on its Automotive Audio pillar to explore and explain the practical approach in designing and implementing those systems.
Recently the role of audio in the automotive industry has significantly changed. Sound systems are used to design the sound of cars, including the sounds the car itself needs to generate to convey its motion to the driver, passengers, and even to the exterior world, signaling its presence. The impact of Battery Electric Vehicle’s (BEV’s) has a profound effect on the way we think about sound in and around vehicles and microphone challenges and use cases.
 
This event will be presented by Roger Shively (JJR Acoustics, LLC) APEI’s Automotive Pillar Chair. Following opening remarks, the event will feature two presentations from Mads Herring Jensen (Technical Product Manager, Acoustics, COMSOL), and Christof Faller (Managing Director, Illusonic GmbH), exploring simulation, visualization, tuning, and auralization topics.
 
Session 1: Modeling Strategies and Techniques in Car Cabin Acoustics (Mads Herring Jensen)
 
Simulation and virtual models plays an important role in the integration of sound systems into the car cabin environment as well as their calibration. This session looks at various modeling approaches and techniques used when assessing these systems. The low to mid frequency behavior is captured with a full wave models, while the high frequency behavior is typically captured with ray acoustics techniques. Emergence of new numerical methods and improved hardware shifts the frequency at which ray techniques are applied. The presentation also discusses boundary conditions as well as source characterization.
 
Session 2: Visualizing, Tuning, and Auralizing  Car Cabin Simulation Results (Christof Faller)
 
A useful method for visualizing the results from an FEA or Ray Tracing models is discussed. Impulse response information is taken directly from a simulation model or generated from amplitude and phase result and imported into an Illusonic tool for reviewing time and frequency data for each point in the results file. For automotive, the number of results point could be microphones set in an array for each listening position. The results data can be grouped for review and comparison to measured data for the purpose of model updates. They can also be grouped and averaged for a virtual equalization as well as auralization. This process will be reviewed and demonstrated.
Mads Herring Jensen

Technical Product Manager, Acoustics, COMSOL, Denmark

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.

Christof Faller

Managing Director, Illusonic GmbH, Switzerland

Christof Faller received an M.S. (Ing.) degree in electrical engineering from ETH Zurich, Switzerland, in 2000, and a Ph.D. degree for his work on parametric multichannel audio coding from EPFL Lausanne, Switzerland, in 2004. From 2000 to 2004 he worked in the Speech and Acoustics Research Department at Bell Labs Lucent and its spin-off Agere Systems, where he worked on audio coding for satellite radio, MP3 Surround, and the MPEG Surround international standard. He is currently managing director at Illusonic, a company he founded in 2006.

Roger Shively

JJR Acoustics, LLC - Seattle, WA USA

Roger is a Co-founder and Principal of JJR Acoustics. He has over 34 years of experience in engineering research and development, with significant experience in product realization and in launching new products at OEM manufacturers around the world. Before co-founding JJR Acoustics in 2011, Roger worked as Chief Engineer of Acoustic Systems as well as functional manager for North American and Asian engineering product development teams in the Automotive Division of Harman International Industries Inc; a journey that began in 1986.
 
 
Roger received his degree in Acoustical Engineering from Purdue University in 1983, and finished post-graduate work in the field of finite element analysis. He is a member of the Audio Engineering Society, Acoustical Society of America, and Society of Automotive Engineering. He has published numerous research papers and articles in the areas of transducers, automotive audio, psychoacoustics, and computer modeling. Roger also holds US and International Patents related to the design of advanced acoustic systems and applications particularly in the field of automotive audio. Roger is Co-Chair of the AES Automotive Audio Technical Committee.