The increasing diversity of modern drive trains increases the effort of acoustic development. How to meet these challenges will be discussed at the Automotive Acoustics Conference.
Alternative drives, lightweight structures and smaller engines present a great challenge to acoustic engineers. To meet the rapid dynamics of technical progress, the developers are faced with the task of effectively reducing not only the noise of the powertrain, but also of many other components. On the other hand, in some places it is even necessary to substitute dropping noises. Lightweight structures, alternative drives and smaller engines thus bring with it new hurdles on the way to a comfortable NVH level. Better measurement analyzes and faster calculation methods are important tools and central topics in the expert discussion.
Perhaps the most important platform for this discussion is the Automotive Acoustic Conference, whose 51st edition with 220 participants is currently taking place in Zurich / Rüschlikon. Half of the trade visitors come from non-German-speaking countries, which underscores the international character of the conference, as Dr. Alexander Heintzel, editor-in-chief of the ATZ-MTZ-Gruppe, emphasized in his greeting. The longest arrivals had the many participants from Japan - who also made the largest foreign group - from China, Taiwan, South Korea, India and South Africa.
New, disturbing noises
Dr. Léon Gavric, Vice President, PSA Groupe's Senior Expert NVH, was the first speaker to predict that the increasing regulatory pressure on combustion engines, combined with technical improvements in electric drives and battery performance, would increase demand for electric vehicles. The lack of masking of many sounds from the internal combustion engine will put more emphasis on various systems and devices, wind noise, rolling noise and tire noise. The NVH requirements are correspondingly large in comparison to vehicles with internal combustion engines. A completely new, but crucial NVH challenge in electric cars is to control the "whine" in the electric drive. Disturbing noises such as squeaks, rattles and sums are also prohibited in the quiet BEV area.
In the same vein dr. Ralf Bocksch, NVH Project Coordinator, Daimler, and responsible for the EQC electric Mercedes brand: "The sound makes the difference." The biggest task is to reduce road noise: Although the battery mass has positive effects on the body structure, harder chassis and tires lead to more acoustic effects from the road. Experience from current electric cars from Mercedes had been the starting point for the NVH development of the new EQC. Based on this basis, damping and insulating parts were developed by adopting the structural concept of the model GLC. After a stringent, goal-oriented development process, the EQC succeeded in developing a quiet, comfortable and characteristic sound.
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