ACTIVE NOISE CONTROL IN VIBROACOUSTIC CAVITY USING AN INERTIAL PIEZOELECTRIC ACTUATOR

초록

Managing medium-frequency noise in vibration-acoustic cavities is challenging due to complex sound fields and multiple-output speakers. Traditional active noise control (ANC) systems struggle in the medium-frequency range (above 200 Hz) due to structural coupling effects within a confined space. To address these limitations, we propose an innovative ANC methodology utilizing inertial piezoelectric actuators. Instead of relying on airborne sound waves, the methodology directly manipulates the vibration properties of structural elements. In this study, the ANC system integrates inertial actuators designed through finite element analysis to show a dynamic force of approximately 11.3 mN/Vpp within the operating frequency range of 400-800 Hz. The adaptive control algorithm of the system based on the FxLMS (Filtered-x Least Mean Square) method was implemented on a real-time digital signal processor to optimize noise suppression performance. Experimental verification was conducted in a vibration-acoustic cavity (700 × 650 × 450 mm3) with a vibrating aluminum panel on one side. Results have shown that the system is capable of mitigating multiple harmonic components, and can achieve noise reductions of up to 13 dB at the dominant frequency using only a single actuator. These findings highlight the potential of inertial actuator-based ANC systems as practical and cost-effective solutions for mid-frequency noise control in various industrial and automotive applications. Copyright © 2025 by ASME.

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