Automotive NVH trends and its subsequent challenges
One of the most prominent trends in the automotive industry is electrification. By phasing out the internal combustion engine, our driving experience is changing. Noise and vibrations are no longer masked by this traditional driveline, which gives rise to new challenges in the field of noise & vibration engineering. A spread focus on various dominant noise sources and a significant increase in the frequency range of interest results in an overload of the traditional NVH engineering process with increasing cost and time-shortages.
Modular way of working
Most automotive NVH divisions are shifting to a more modular approach to cope with this. Therefore, component models (either simulated or measured) need to be of sufficient quality to be useful for NVH engineering/prediction in a multi-kHz frequency range. Also, active sources, such as the (e-)driveline and auxiliary systems, require to be characterized in such way that their vibration description is a property of the component itself.
The VIBES Methodology enables this modular way of working. Engineers are able to obtain modular descriptions of individual components which are valid in a large frequency range, typically up to 3000Hz or higher. Blocked Forces are being used as the independent quantities describing the active vibrations of the source. Component models and blocked forces are coupled together using Dynamic Substructuring.
With our DIRAC software, engineers can measure component models and obtain Virtual Points, ensuring compatibility with simulation models and with the added benefit of giving insight in the model quality and reliability. This allows for creating powerful hybrid assemblies and cherry-picking the best component modeling approach on a case-by-case basis.
Our SOURCE solution allows for obtaining independent blocked forces. By combining DIRAC and SOURCE, we combine measurement and simulation and significantly improve the quality of sound and vibration prediction for automotive assemblies.