Improved Interior Acoustic Environment for Ultra-compact EVs (Fundamental Consideration of 1/f Fluctuation Including Music for Evaluation of Ride Comfort)

Since 2012, one-or two-seater ultra-compact electric vehicles, which have become easy-to-use mobility solutions for everyone, have been researched and actively developed.Even though it is extremely important to provide the ride comfort according to various situations and space preference of the passenger to advance the high-value-adds of automobiles, interior noise has not been researched sufficiently.In the study of the improvement of interior comfort, a technique to make the noise less noticeable is by using the music output of a second sound source.We conducted numerical experiments and calculated the fluctuation coefficient to select highly relaxing music.Moreover, we considered the quantitative evaluation of the comfort in the interior by using the human biological information as the initial stage of the comfort in the inside space of a car for various passengers.Furthermore, we studied music by real-time analysis to consider the relationship between the variation in the fluctuation coefficient, range of frequency, and time course.

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