Active control of pump noise of dishwashers using FxLMS algorithm

Un-su Tark, Han-Eum Oh, Chinsuk Hong, and Weui-Bong Jeong

doi:10.7776/ASK.2021.40.1.046

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2021 Vol.40, Issue 1 Preview Page Next Page

Research Article

Active control of pump noise of dishwashers using FxLMS algorithm FxLMS 알고리듬 기법을 이용한 식기 세척기의 펌프 소음 능동 제어

January 2021. pp. 46-54

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Abstract

본 논문에서는 가정용 식기세척기의 저주파 대역 방사 소음 저감을 위하여 능동 소음 제어를 수행하였다. 먼저 식기세척기의 소음 환경 분석을 통해 펌프 소음이 저주파 대역 방사 소음에 가장 크게 기여하고 있음을 확인하였고 이를 고려하여 참조 신호를 선정하였다. 참조 신호는 음향피드백을 방지하기 위해 가속도계를 이용하여 펌프 몸체에 부착하여 획득하였다. 오차 신호 센서는 식기세척기 전방 1 m, 높이 0.5 m에 위치한 마이크로폰으로 선정하였다. 다음으로 제어기 설계를 위해 식기세척기의 작동 회전수 2,500 rpm, 2,600 rpm, 2,800 rpm에 대하여 오차 신호와 참조 신호를 측정하고, 2차 경로 전달함수를 측정하였다. 그리고 설계된 제어기를 Digital Signal Processor(DSP) 장비에 탑재 시켜 제어 성능을 시험으로 확인하였다. 시험 결과 펌프 작동 주파수의 7차 배수 성분에서는 회전수 별로 1.93 dB, 4.43 dB, 5.15 dB 만큼 줄었고 12차 배수 성분에서는 회전수 별로 6.67 dB, 2.34 dB, 4.28 dB 만큼 줄었다. 그리고 overall Sound Pressure Level(SPL)은 회전수 별로 0.84 dB, 2.58 dB, 1.48 dB 만큼 줄었다.

키워드

식기 세척기

능동 소음 제어

오차 신호

참조 신호

Filtered-x Least Mean Square (FxLMS) 알고리듬

Digital Signal Processor (DSP)

In this paper, active noise control was performed to reduce radiated noise in the low frequency band of dishwashers. First, through an analysis of the noise environment of the dishwasher, it was confirmed that the pump noise contributed the most to the radiated noise in the low frequency band, From the result of the noise environment analysis, the reference signal was selected to be the vibration signal of the pump body. The reference signal was obtained by using the accelerometer on the pump body, which can prevent acoustic feedback. The error signal sensor was selected as a microphone located at 1 m in front of the dishwasher and 0.5 m in height. And to design the controller, the error signal and the reference signal were measured at the operational rpms of the dishwasher at 2,500 rpm, 2,600 rpm and 2,800 rpm, and the secondary path transfer function was measured. The designed controller was mounted on Digital Signal Processor (DSP) equipment, and the control performance was verified experimentally. As a result of the measurement at the 3 operational rpms, the 7^th multiple component of pump operating frequency decreased by 1.93 dB, 4.43 dB, 5.15 dB per rpm, and the 12^th multiple component decreased by 6.67 dB, 2.34 dB, 4.28 dB per rpm. And overall Sound Pressure Level (SPL) decreased by 0.84 dB, 2.58 dB, 1.48 dB by rpm.

Keywords

Dishwaher

Active noise control

Error signal

Reference signal

Filtered-x Least Mean Square (FxLMS) Algorithm

Digital Signal Processor (DSP)

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Information

Publisher :The Acoustical Society Of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 40
No :1
Pages :46-54
Received Date :2020. 12. 09
Revised Date :2020. 12. 24
Accepted Date : 2021. 01. 11
DOI :https://doi.org/10.7776/ASK.2021.40.1.046

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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