Study of the Acoustic Perceptibility of Vehicles Moving with a Constant Speed

The paper presents the results of an experiment on the assessment of subjective indicators of acoustic perceptibility by pedestrians (experts) of a vehicle approaching at a constant speed (TS) and some conclusions. Subjective indicators of perceptibility were defined as the distance between the vehicle and the expert, at the moment when the expert heard (recorded) the sound of an approaching car, as well as the time of the car's approach to the expert at that moment. Subjective indicators of perceptibility are compared with the objective parameters of car noise measured by the method of UN Regulation No. 138 — the sound pressure level, its frequency response, as well as the sound level. The study is motivated by the problem of traffic safety of electrified vehicles with low noise, which include, in particular, electric cars, electric scooters and electric scooters. This article publishes the first results of a research paper devoted to the problem of increasing the perceptibility of low-noise vehicles for pedestrians without damaging the acoustic ecology of cities and suburbs.