Navigating EV Pass-by Noise Testing: Capturing AVAS Sounds with Precision
As EVs operate more quietly than traditional vehicles, Acoustic Vehicle Alerting Systems (AVAS) have become essential for road safety. However, this introduces new challenges in pass-by noise testing, where precise measurements are crucial for meeting regulations like UNECE R138. Standard testing methods may not be sufficient, selecting the right microphones is key to ensuring accuracy and reliability.
EVs Present a New Challenge for Noise Regulations
Electric vehicles (EVs), known for their quiet performance, introduce a new challenge in balancing noise reduction with pedestrian safety. Regulations from the European Union (EU) and other regulation currently require EVs to produce a certain amount of noise, unlike traditional vehicles where the focus has been on reducing noise pollution. To address this, Acoustic Vehicle Alert Systems (AVAS) have been made mandatory for EVs. These systems create audible sounds at low speeds, where EVs tend to be quieter. Many auto manufacturers have embraced this requirement, turning sound design into a key part of their brand identity. But what are the pros and cons of these new noise and sound regulations?
What are the minimum sound levels set by the new regulations for EVs/AVAS?
In Europe, the key regulations governing the minimum sound levels for electric vehicles (EVs) equipped with Acoustic Vehicle Alert Systems (AVAS) are Commission Delegated Regulation (EU) 2017/157, the EU Regulation on the Sound Level of Motor Vehicles (EU 540/2014), and ECE R138. These regulations establish the minimum sound level for AVAS at 56dB for speeds up to 20km/h. Depending on the comparison charts, this is similar to the sound of a home refrigerator, a dishwasher, or an electric toothbrush.
The Significance of Accurate Noise Measurement
Testing for minimum pass-by noise levels follows the same procedure as testing for maximum levels. Whether measuring minimum or maximum sound levels, precise noise measurement is crucial in pass-by noise testing. It is essential to use high-quality microphones that can capture a broad range of frequencies with minimal uncertainty. Our brochure on Pass-by Noise Testing, available for download on this page, outlines the various conditions under which tests should be conducted and suggests appropriate microphones and other equipment for carrying out the tests.
Key Takeaways from the Pass-by Noise Testing Guide:
- Environmental Noise Regulations
- Testing Methods and Challenges
- Importance of Microphone Selection
- Microphone and Test Equipment Recommendations
- Acoustic Vehicle Alert Systems (AVAS)
Achieving accurate pass-by noise measurements requires the right tools and expertise. At TME Systems, we provide high-performance acoustic solutions and expert guidance to help you meet industry standards with confidence. Contact us today to find the best measurement solutions for your EV noise testing needs.