Wiktor Wise
Electric vehicles (EVs) are known for being quieter than traditional cars, due to their motors having fewer moving parts. However, this lack of sound can create safety issues for drivers, pedestrians, and other road users. As a result, regulators have begun mandating that EVs emit some kind of sound, particularly at low speeds, to improve safety. This has led to the development of a new field of sound design for electric vehicles, with companies like Ford, Hyundai, and Nissan creating unique sounds for their electric cars. These sounds aim to provide functional feedback to drivers and alert pedestrians and other road users to the presence of the vehicle. The introduction of artificial sound to electric vehicles has sparked debate, with some arguing it will increase noise pollution, while others see it as an opportunity to craft a new soundscape for the future of transportation.
| Characteristics | Values |
|---|---|
| Purpose | To address safety concerns regarding acoustic perception of electric vehicles, particularly for pedestrians, cyclists, or visually impaired people |
| Methodology | User tests, Interactive Genetic Algorithms (IGA), analysis of variance, conjoint analysis |
| Considerations | Pleasantness, appropriateness, technical specifications, affective reactions, noise pollution |
| Recommendations | Continuous sound at low speeds, standardisation of tones, consideration of detection time measurements, interactive bi-objective optimisation process |
| Related Studies | Petiot et al. (2013, 2019), Misdariis et al. (2013), Parizet et al. (2013), Poveda-Martínez et al. (2017), Pedersen et al. (2011), Maier et al. (2011) |
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What You'll Learn
- Electric vehicle warning sounds and safety relating to acoustic perception
- The necessity and enthusiasm for adding sounds to electric vehicles
- The design of synthetic exterior vehicle sounds
- The emotional reactions to artificial exterior sounds
- The optimisation of the detectability of electric vehicle sounds
Electric vehicle warning sounds and safety relating to acoustic perception
As electric vehicles (EVs) and hybrid electric vehicles (HEVs) become more prevalent, safety relating to acoustic perception is an important issue that needs addressing. This is particularly true in relation to pedestrians, cyclists, and people with visual or auditory impairments.
The issue of safety regarding the quietness of electric vehicles has been recognised by various governments and organisations. Japan issued guidelines for electric vehicle warning devices in 2010, and the U.S. approved legislation in December of the same year. In 2011, the European Commission drafted a guideline for Acoustic Vehicle Alerting Systems (AVAS), recommending that vehicles provide an audible signal to pedestrians and vulnerable road users when travelling at low speeds (up to 20 km/h or 12 mph). In 2013, the European Parliament approved a draft law to tighten noise limits for cars and add alerting sounds to electric vehicles to improve safety for vulnerable road users.
To address this safety issue, car manufacturers have been developing warning sounds for their electric vehicles. For example, Nissan has developed the Vehicle Sound for Pedestrians (VSP) system, which emits a noise to alert pedestrians of an approaching vehicle, without distracting the car's occupants. Ford Motor Company is also working on a similar system for its future hybrids and electric vehicles.
There is a concern that adding artificial sounds to electric vehicles may lead to noise pollution, and there is a lack of consensus on what type of sound is appropriate. Studies have found that novice users prefer the sound of a traditional combustion engine, while experts tend to focus on the composition of the sound. The National Highway Traffic Safety Administration (NHTSA) in the U.S. has also raised concerns about the potential impact of unlimited driver-selectable sounds on compliance and safety.
Overall, while the addition of warning sounds to electric vehicles has the potential to improve safety for vulnerable road users, it is important to carefully consider the type and number of sounds used to avoid negative impacts on both the public and the industry.
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The necessity and enthusiasm for adding sounds to electric vehicles
The necessity of adding sounds to electric vehicles has been a topic of discussion as electric vehicles have gained popularity in the automobile market. While electric vehicles offer environmental benefits, they also pose safety concerns due to their quiet operation, particularly regarding pedestrians, cyclists, and individuals with visual impairments. The issue of acoustic perception and the potential risk of accidents have sparked initiatives to address this concern.
The addition of sounds to electric vehicles aims to enhance safety by making these vehicles more audible to vulnerable road users. In 2011, the European Commission drafted guidelines for acoustic vehicle alerting systems (AVAS), recommending the installation of audible signals in electric and hybrid vehicles. These systems are designed to generate continuous sounds at low speeds, during reversing, and when idling, improving their detectability and reducing the risk of accidents.
While the necessity of adding sounds to electric vehicles is generally acknowledged, there is little enthusiasm for it. Studies have shown a diversity of opinions regarding the pleasantness and appropriateness of different sounds. Novice users often prefer the sound of traditional combustion engines, while experts focus on composition-based aspects. The challenge lies in finding a suitable sound that addresses safety concerns without causing noise pollution or creating a confusing soundscape on the streets.
The process of determining the appropriate sound for electric vehicles is complex. Several factors must be considered, including technical specifications, emotional reactions, and the potential impact on noise pollution. The sound should provide adequate warning without being intrusive or detrimental to public health. It is essential to strike a balance between ensuring safety and maintaining a peaceful acoustic environment, especially in residential areas.
The enthusiasm for adding sounds to electric vehicles may be subdued, but the focus on safety remains a priority. Manufacturers are working to develop systems that emit external sounds, and regulations are being established to ensure the effectiveness of these warning systems. The goal is to create a standardized approach that enhances safety without contributing to excessive noise levels, ultimately ensuring a harmonious coexistence between electric vehicles and vulnerable road users.
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The design of synthetic exterior vehicle sounds
To address these concerns, manufacturers have turned to active sound design (ASD) to create synthetic exterior vehicle sounds. ASD takes inputs from engine and vehicle speed, pedal input, exhaust noise, and vehicle vibrations to modify the interior and exterior noise of the vehicle. This allows manufacturers to enhance the perceived engine power and create a unique brand identity through sound.
One important aspect of synthetic exterior vehicle sound design is user preference and emotional reaction to different sounds. Studies have shown that novice users tend to prefer the sound of a traditional combustion engine, while experts focus more on the composition of the sound. Additionally, participants in studies have assessed sounds based on pleasantness and appropriateness, indicating a diverse range of opinions.
When designing synthetic exterior vehicle sounds, it is crucial to consider the potential for noise pollution. While adding sounds to electric vehicles can improve safety, it is important to strike a balance and ensure that the sounds do not negatively impact the experience of pedestrians, cyclists, and other drivers. This includes considering the volume and frequency of the sounds, as well as the ability to temporarily deactivate the sound when necessary, such as during quiet hours.
Furthermore, legislative guidelines play a significant role in shaping the design of synthetic exterior vehicle sounds. The European Commission, for example, has drafted guidelines for acoustic vehicle alerting systems (AVAS), recommending a continuous sound at low speeds and during reversing. These guidelines aim to ensure the safety of vulnerable road users while providing flexibility in the sound design process.
In conclusion, the design of synthetic exterior vehicle sounds involves a combination of technical expertise and an understanding of user preferences and emotional reactions. By leveraging active sound design, manufacturers can create sounds that enhance safety, provide a pleasant user experience, and establish a unique brand identity.
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The emotional reactions to artificial exterior sounds
As electric vehicles are becoming more common, safety relating to acoustic perception is an important issue. Electric vehicles are quiet, which can be a safety concern for pedestrians, cyclists, or visually impaired people. Adding artificial sounds to an electric vehicle raises the question of what kind of sound is appropriate. The emotional reactions to 17 artificial exterior sounds for electric vehicles were investigated in an experimental setting with 40 participants, including 34 novice users and six sound experts.
The participants' assessments of the sounds were analysed according to two semantic scales: pleasantness and appropriateness. There were considerable inter-individual differences in the ratings of pleasantness and appropriateness, indicating a great diversity of opinion about the sounds. Novice users indicated a preference for the sound of a traditional combustion engine, while participants overall saw the necessity but had little enthusiasm for adding sounds to electric vehicles.
Overall, the emotional reactions to artificial exterior sounds for electric vehicles are diverse and multifaceted. While adding sounds to electric vehicles can improve safety for vulnerable road users, it is important to carefully consider the potential emotional impact of these sounds on different individuals and groups. Further research and user testing are necessary to inform the design of sounds for electric vehicles that are both effective and emotionally appropriate.
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The optimisation of the detectability of electric vehicle sounds
Electric vehicles (EVs) are very quiet at low speeds, which can be hazardous for pedestrians, especially those who are visually impaired. While it is now mandatory to add external warning sounds, poor sound design can lead to noise pollution and annoyance. However, EVs may not be sufficiently detectable in urban areas due to the masking effect of background noise.
To address this issue, a method for designing EV warning sounds that considers both detectability and unpleasantness has been proposed. This method employs Interactive Genetic Algorithms (IGA) to optimise the characteristics of synthesised sounds. Experiments are conducted to define a set of Pareto-efficient sounds, and the sounds obtained with IGA are compared to different sound design proposals. This process allows for the extraction of design recommendations from IGA experiments, providing guidance on the optimisation of EV warning sounds.
Several studies have provided recommendations on the nature of EV warning sounds based on detection time measurements. These studies include Misdariis, Gruson, and Susini (2013); Robart and Parizet (2013); and Parizet et al. (2014). However, these recommendations must also consider potential noise pollution, which could negatively impact pedestrians, cyclists, and other road users.
The optimisation of EV warning sounds is a complex process that requires careful consideration of various factors. By utilising IGA and conducting thorough experiments, it is possible to design warning sounds that are both detectable and pleasant, ensuring the safety of vulnerable road users while minimising noise pollution.
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Frequently asked questions
Electric vehicles are almost silent at low speeds, which can be dangerous for pedestrians, cyclists, or visually impaired people. Adding sounds to electric vehicles at low speeds can help improve safety for vulnerable road users.
There are two main challenges in designing sounds for electric vehicles: detectability and unpleasantness. The sound should be audible above background noise to serve its purpose, but it should also not be annoying or cause noise pollution.
One method is to use Interactive Genetic Algorithms (IGA) to optimize the detectability and unpleasantness of the sounds. Another approach is to use an experimental protocol that involves user tests and listening tests to assess the performance of different sounds.
