New legislation states that H/EVs should emit 'non-vehicle based sounds' using devices such as speakers fitted to the vehicle.
A challenge for the NVH experts is to come up with appropriate methods for evaluating the exterior sounds of H/EVs so that they comply with the legislation to ensure pedestrians' safety and reinforce the vehicle brand (as desired by the vehicle manufacturer).
How do we evaluate future electric vehicle sounds?
- Formulate a methodology for evaluating EV sounds by critically reviewing the academic literature, vehicle legislation, and manufacturer’s requirements.
- Test, validate and improve the proposed methodology
- ensuring pedestrians’ safety (being appropriately detectable and complying with the legislators) and,
- reinforcing the brand image (as desired by the manufacturer)
A methodology was proposed to holistically evaluate EV exterior sounds for the criteria of pedestrians’ safety and brand reinforcement, by suggesting an experimental approach that assesses − detectability of these sounds and emotional evaluation of the vehicle based on listening to its sounds.
An initial methodology, constituting experimental guidelines for evaluating EV exterior sounds, was formulated by critically reviewing the knowledge base (literature, legistaion and manufacturers). An iterative process tested and further improved the developed methodology using evaluation experiments. Refer to the flowchart below: