Active Noise Control of Air Conditioning System Noise

Abstract

A HVAC (Heat Ventilation Air Condition) system of the passenger seat in the autonomous bus is used for heating and cooling of the seat. The compressor of the HVAC system generates the operating noise, and the noise makes passengers annoyance. The frequency spectrum of the compressor noise composes of operating frequency and its harmonics components. The frequency band of operating frequencies is low, and that of harmonic frequencies is high. Active noise control (ANC) has been used for the reduction of low-frequency noise while a passive method using absorption material has been used for the attenuation of high-frequency harmonic noise. However, some part of harmonic components at low-frequency band among harmonic components is not able to reduce by using absorption materials. In this paper, a new ANC method is proposed for the reduction of the noise level of low-frequency harmonic components based on the harmonic filtered x- LMS (HFX-LMS) algorithm. The novel method is successfully applied to the noise control of the compressor of the HVAC system of the passenger seat in the autonomous bus.