- 學位論文
場域型主動噪音控制應用於頭枕與挖土機駕駛艙
Active Noise Control with Quiet Zone for Headrest and Earth-moving Machine Cabin
摘要
本篇論文使用主動噪音控制技術(Active Noise Control, ANC)來產生出局部的靜音區(Quiet Zone)，以降低噪音。我們在座椅的頭枕(Headrest)上，放置ANC系統所需之麥克風以及喇叭，並透過數位訊號處理器(Digital Signal Processor, DSP)運行有限脈衝響應(Finite Impulse Response, FIR)濾波器為主的單通道以及多通道前饋式主動噪音控制系統(Single/Multiple Channel Feedforward ANC)，以達到消除寬頻噪音的目的。在頭枕系統上，使用80~800 Hz的限制頻寬白噪音(Band-limited White Noise)做為噪音源，並透過虛擬量測技術(Virtual Sensing Technique)將靜音區轉移至耳朵的位置，使得耳朵位置的降噪效果得到近一步的提升。我們也將此技術應用於挖土機駕駛艙(Earth-moving Machine Cabin)，以消除挖土機引擎怠速噪音，實驗結果發現，本技術可以在挖土機駕駛頭部可移動範圍內，達到15dBC以上的消噪效果。本文也提出了方法來減少前饋式主動噪音控制系統參考麥克風與誤差麥克風的距離，透過即時數位訊號處理的實驗證明其效果，並探討噪音源方向的影響。
並列摘要
This thesis, presents the development of Active Noise Control (ANC) system to create the Quiet Zone (QZ) at the desired area by placing several microphones and loudspeakers on the headrest. Both single channel and multiple channel feedforward ANC systems based on Finite Impulse Response (FIR) filters are processed by Digital Signal Processor. In headrest ANC system, 80~800 Hz band-limited white noise is used for the noise source. The virtual sensing technique is developed to transfer the QZ from the error microphones to ear locations, the noise reduction performance can be improved. ANC system is also applied on the earth-moving machine cabin to reduce the engine noise. The noise reduction performances more than 15 dBC can achieved to cover the moving range of driver’s head. This thesis presents the methods to reduce the processing delay of feedforward ANC system. Can make the distance from the reference microphone to the error microphone short enough to enable placing the reference microphone on the headrest system. In this paper we also explore the effect of the noise source direction.
參考文獻
延伸閱讀
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