Electric vehicles, being inherently quiet without the
typical combustion noises, pose a potential safety
concern, especially at low speeds. Consequently,
an Acoustic Vehicle Alerting System (AVAS) is mandatory
in many countries worldwide to warn pedestrians
of approaching electric vehicles. The development of
AVAS sounds involves conducting measurements on
an outside noise test track to verify compliance with
regulations. Various environmental parameters on the
test track can influence the transmission of sound from
the car’s AVAS speaker to the measurement
microphones.
This research delves into understanding the relationship
between the transmission of sound over short
distances and environmental parameters. Over a one-year
period, 122 measurements were conducted using a
specially designed dolly setup. The frequency response
function, which characterises the sound transmission, was
calculated to determine the dependencies and correlations
with environmental parameters.
The findings reveal a significant dependency on environmental
parameters, as indicated by a linear regression
model. Frequency-based correlation analysis indicates
variations in dependency across the spectrum.
Furthermore, the analysis suggests that sound transmission
is more effective in denser mediums, such as colder
air temperatures and higher air pressure. The density of
the medium, derived from the measured parameters,
exhibits a high dependency.
These results now enable predictions of sound transmission
on the outside noise test track under user-defined
environmental conditions using artificial intelligence. This
advancement not only enhances our comprehension of
variations in test track results but also facilitates the
prediction of future outcomes.
«
Electric vehicles, being inherently quiet without the
typical combustion noises, pose a potential safety
concern, especially at low speeds. Consequently,
an Acoustic Vehicle Alerting System (AVAS) is mandatory
in many countries worldwide to warn pedestrians
of approaching electric vehicles. The development of
AVAS sounds involves conducting measurements on
an outside noise test track to verify compliance with
regulations. Various environmental parameters on the
test track can influence...
»
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