Waves Magazine - Free Online Magazine

Something quiet this way comes

Traditionally pass-by noise measurement is a requirement for all automotive manufacturers as part of product certification, with measurement procedures defined in local and regional standards to ensure that noise levels are not exceeded, but times change. The introduction of extremely quiet electric vehicles (EVs) and hybrid vehicles (HVs) introduces more changes and challenges than just a different propulsion method; ‘too loud’ now only covers half of the problem.

Today's proving ground for vehicles of the future

Mercedes-Benz’ decision to build a new proving ground was spurred by its global target of achieving homologation of all vehicles so that any vehicle will meet or exceed projected global standards regardless of country or region of origin, combined with the need for durability testing.

There and back again, an artist's tale

Jacob Kirkegaard is a Danish sound artist and composer whose work has been presented across the world in galleries, museums, international art exhibitions and concert spaces, and is represented in the permanent collection of LOUISIANA – Museum of Modern Art in Denmark. Jacob is also a founding member of the sound-art collective freq_out and the non-profit arts organization TOPOS. In 2016, Kirkegaard was the sound- artist-in-residency at St. John’s College, University of Oxford, UK...

Sound generation – Structure-borne sound: Part 1

Previous articles covered the transmission of sound through air and how it is picked up by human hearing. This article addresses sound generation, particularly the vibration of solids and how that leads to sound – using an acoustic guitar as an example.

What charge injection calibration is and is not

Charge injection calibration (CIC; invented and patented by Brüel & Kjær in the middle of the 90s) is a convenient method to verify the integrity of a condenser microphone measurement channel, including the microphone cartridge, without any need for operator interaction.

Acoustic camera gets down to work at Wave Engineering

The most recent addition to consultancy Wave Engineering’s acoustic measurement toolbox is a state-of-the-art BK Connect® Acoustic Camera. It’s already been put to good use distinguishing problem noise sources from other noise sources at industrial facilities, successfully finding leaks in modular wall systems and investigating sound isolation problems.

Sound Source Identification On A Clean-C Turbofan Engine

Identifying acoustic sound sources is a key issue for low-noise design of propulsion systems. The Japan Aerospace Exploration Agency and Brüel & Kjær have been involved in acoustic measurements using sub-scale models and full-scale systems.

Hurray for the... Rats?

Strange as it may seem in 2019, people are still being seriously injured or killed by landmines placed in wars that, in some cases, have been over for decades.

Five questions for Ricarda Nerche

A native of Dresden, Germany, 37-year old Application Engineer Ricarda Nerche lives in an old farmhouse with her husband, two daughters, four sheep and a cat.

The purrfect power

A purring cat is a contented cat, and although that is often the case, cats also purr when injured, frightened or giving birth.

Fidelity fights back

If you’ve been around long enough, you’ll remember when hi-fi meant sitting in front of two loudspeakers in a room, spending time dedicatedly listening to music – something many young people have never experienced. Today, premium audio increasingly means smart speakers, sound bars, and headphones. And nobody seems to sit anywhere for very long.

Phoenix Testlab preventing gaps in a 360° test lab

Based in Blomberg, Germany, Phoenix Testlab GmbH is an independent and accredited test laboratory and certification institute for products, systems, and components from various sectors of industry.

Sounds great

Customers care about the audio quality of the loudspeaker systems in their cars; it’s one of the key factors affecting a car purchasing decision. For most car drivers and passengers, listening to music is an integral part of the driving experience.

From diagnosis to solution – fast

What can be done with an interior noise problem? By applying advanced tools and methodologies, the cause of interior vehicle noise can be quickly developed and validated to derive a solution.

Acoustic camera gets down to work at Wave Engineering

The humble guru of structural dynamics

A brilliant mathematician, the Vold in Vold-Kalman, developer of groundbreaking algorithms, patent holder, published author, award winner and former infantryman – the knowledge, skills, experience and achievements of this ´60% retired` 72-year-old Norwegian are endless.