A study on interior sound design for ultra-compact EVs: fundamental consideration on quantitative evaluation by multi biological information for inside acoustic environment

抄録

The ultra-compact EV which has one or two seaters have been researched and developed for new eco-friendly transportation system recently. The main interior noise are road and wind noise in this vehicle which have a large impact on occupant comfort in the interior space. Because this vehicle has electric motor instead of engines. However, the countermeasure for interior noise of ultra-compact EV has not been done due to available space and increase weight of this vehicle. Therefore, regarding with active noise control for interior noise environment of ultra-compact EV, it is extremely important to provide ride comfort according to various situations and the space preference of a passenger to advance the high-value-adds of automobiles. We have been researched ride comfort of interior noise environment for ultra-compact EV by using brain wave measurement which is one of the biological information and quantitative evaluation of ride comfort by analyzed measured brain wave data. In this paper, we considered noise environment effect for driver using measured brain wave under the different noise condition during driving by driving simulator. In the experimental noise condition, we used road noise which is 70 dB at ear of driver considering driving situation and assumed noise reduction condition. From the experiment result, we proved that the brain wave measurement result was different when the participant drives under the different noise condition. In addition, from the result of the free description type questionnaire answer, drivers felt a burden during driving operation.