Automotive NVH Testing with ACS

April 20, 2022 - Author: Randy Rozema - Director, Acoustics & Vibration

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EVs Present New Challenges in Automotive NVH Testing

In the world of automotive engineering, addressing unwanted vehicle noise has been a longstanding challenge. Squeaks, rattles, and excessive road noise can detract from the driving experience, emphasizing the importance of reducing Noise, Vibration, and Harshness (NVH). With the rise of Electric Vehicles (EVs), this challenge becomes even more complex due to their inherently quieter nature compared to traditional gas-powered vehicles.

To shed light on the importance of automotive NVH testing, Randy Rozema, Director, Acoustics & Vibration, walks us through different facets of the process. He emphasizes the critical role of NVH testing, especially in the context of electric vehicles, discusses the required equipment and facilities, and underscores the valuable insights engineers can glean from test data. This discussion takes place in the Assembly Audible podcast.

The transition from internal combustion engines to electrification in the automotive sector amplifies the need for NVH testing. Electric motor noise lacks the masking quality of traditional engines, making previously unnoticed sounds more apparent. This shift requires addressing new challenges such as airbag noise and interior compartment noise, which were historically overshadowed by the car engine sound.

When it comes to NVH testing and addressing these challenges, it requires specialized equipment and facilities tailored to the unique characteristics of electric vehicles. Randy mentions the necessity of anechoic or semi-anechoic rooms for precise electric vehicle sound level measurements, as well as reverberation rooms for conducting sound absorption tests. Additionally, coupling these rooms together allows for assessing transmission loss through materials used in vehicle construction.

This will require specialized equipment like shaker systems to be employed to evaluate the buzz, squeak, and rattle aspects of automotive NVH, ensuring a high-quality driving experience. Randy emphasizes the importance of NVH testing in enhancing the overall EV performance and customer satisfaction.

Listen to the full-length podcast here.