Dabrowski Z., Stankiewicz B.

Current car’s technological development represents the similar level. The field for producers’ competition becomes convenience of vehicle. One of comfort measure for users is level of noise in its interior. Recent years development of ANC systems makes possible to use it to decrease noise level in passenger car. As the subject is very important, an attempt to create such system was taken. The task necessary to develop working system, can be divided to three stages: - preliminary research of object in which we want to decrease noise level - essential calculations and numerical simulations - technical design, building the system and testing it in real conditions Last stage is the most expensive. In order to avoid possible big losses, very often it was preceded by extended laboratory research. This paper concerns only two first stages of the whole project mentioned above - it is kind of report of realized researches and analyses. In the paper is presented research it was realized in different brands and types of passenger cars. It relies on acquisition of acoustic pressure in different points of interior, as well as vibrations of some elements of car body, suspension or engine. Results from numerical simulations (modeling real active noise control system) are presented. Different versions of control algorithm are analyzed, beginning from the simplest one to normalized least mean square algorithm. It is studied measurement points, which can be used in real system. Modification of active noise control algorithm, which increases theoretical performance of ANC system, is proposed in the paper. Conclusions drawn in the paper indicate aims of future works.