The Critical Role of Wind Noise Testing in the EV Era

he increasing popularity and growing offering of electric vehicles (EVs), are changing many aspects associated with vehicle sound and acoustics (see our posts related to the in-cabin soundscape of the EV, for example). The classic issue of pass-by noise testing is no exception. Still a crucial aspect of automotive design and regulation, it has evolved to ensure that EVs (and other vehicles) not only meet the maximum noise limits set by various national and international regulations, but also adhere to new minimum noise requirements.

The Growing Role of Wind Noise Testing in EVs 

The shift to electric vehicles means greater emphasis on the passenger experience, particularly in terms of cabin noise. In the absence of traditional engine noise, wind noise assumes a more pronounced role, influencing the overall perception of vehicle quality and comfort. At speeds over 55 km/h (34 mph), wind noise becomes a significant contributor to the acoustic environment inside an EV, accounting for a considerable portion of the noise experience. 

This heightened impact of wind noise on passenger comfort makes precise and comprehensive wind noise testing a crucial factor in the design and development phase. Such testing not only aims to quantify the noise levels but also to understand their sources and the effectiveness of various noise mitigation strategies. The goal is to enhance the quietness and comfort of the EV cabin to satisfy the consumers who choose electric vehicles expecting a more quiet and luxurious driving experience. 

The Costly Necessity of Wind Tunnel Testing 

Wind tunnel testing offers a controlled environment to accurately simulate and measure the effects of wind on a vehicle. Wind tunnel testing allows automotive engineers to dissect and understand how aerodynamic factors—such as vehicle shape, the positioning of side mirrors, and the design of door seals—contribute to noise levels inside the cabin. The method is necessary to identify potential noise issues early in the design process, allowing for adjustments before production. However, the precision and insights provided by wind tunnel testing come at a high cost. The operation of wind tunnels, preparation of vehicles for testing, and the intricate setup required for accurate measurements all add up to a significant investment of both time and resources. 

The expense associated with wind tunnel testing makes it imperative to maximize the efficiency and effectiveness of each testing session. Accurate and reliable data collection is crucial as it informs decisions that can significantly impact the design and manufacturing process, ultimately affecting the success of the final product in the market. And as repeat testing is an unwanted expense, engineers need to get it right and capture the necessary data accurately on the first try. This makes choosing the right measurement microphones a very important subject. 

Microphone Selection is Critical 

The intricacies of wind noise testing demand the use of specialized equipment to capture accurate and meaningful data. The selection of microphones, in particular, is crucial to the success of these tests. Traditional microphones may not offer the sensitivity or specificity required to isolate and measure the subtle nuances of wind noise in electric vehicles. That’s why we’ve published a brochure introducing a range of microphones specially designed for the challenges of wind noise testing in EVs.  

Our Ultra-Thin Precision (UTP) microphones, for example, are engineered to capture detailed aerodynamic noises even in confined spaces or at minimal surface disruptions. These microphones combine the advantages of precision measurement with a small form factor, allowing engineers to conduct in-depth investigations into boundary layer and turbulence noise. 

All microphones covered in the brochure are engineered to provide precise, reliable measurements, enabling engineers to quickly and accurately capture data that is critical for evaluating and improving vehicle acoustics. By utilizing the right microphones, engineers can enhance the efficiency of wind tunnel tests, gaining valuable insights into wind noise sources and their impact on vehicle design. 

Download the brochure today 

Explore our recommendations for microphones and equipment designed for tackling the challenges of wind noise testing. By embracing innovative testing methodologies and leveraging specialized microphones, you’ll be able to make the most of your investments in wind tunnel testing.