A Study on Active Noise Control by Giant Magnetostrictive Actuator

(Fundamental Consideration on Noise Reduction for Low Frequency Noise in Cabin)

Abstract

The ultra-compact EV has been new transportation system in Japan recently. The vehicle uses an electric motor as a power source instead of a gasoline engine or a diesel engine, it not only has a low environmental impact, but also does not generate noise from the engine. Therefore, the noise input into the vehicle mainly consists of road noise from the tires and wind noise. For the interior noise problem, we focused on a giant magnetostrictive actuator, which is small in size and generates a high output and proposed an active noise control system using the wall vibration generated by the giant magnetostrictive actuator, thereby confirming the silencing effect. In this study, we used an experimental vehicle exterior and conducted noise reduction experiment using feed forward control by all pass filter. In the experiment, we changed phase degree of phase compensate in all pass filter and considered noise reduction effect by each phase degree.