| DESIGN OF FILTER LENGTH OF ORDER FILTER AND ITS APPLICATION TO FILTERED-X ALGORITHM FOR ACTIVE NOISE CANCELLATION OF INTERIOR NOISE INSIDE AN EXCAVATOR CABIN
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| Jiseon Baek 1, Changhoon Lee 1, Jinhwan Yoo 1, Sang-Kwon Lee 1, Kisoo Choi 2, Seongjae Kim 2, Hyeongho Kim 2 |
1Inha University
2DOOSAN Infracore |
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| ABSTRACT |
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This paper presents a novel method to determine the filter length. Major interior noises inside an excavator
cabin are hydraulic pump noise. The filtered x-LMS (FxLMS) algorithm using a notch filter has been widely applied to ANC
of engine noise inside the cabin of a passenger car. A notch adaptive filter is a comb-type filter and is useful to attenuate a
steady-state pure tone. When the rotating speed of the crankshaft accelerates steadily in sweep mode, instantaneous
frequencies of the hydraulic pump noise and cooling fan noise inside an excavator cabin increase steadily. The FxLMS
algorithm using a notch filter can be stably applied to the ANC of the interior noise inside an excavator cabin in steady sweep
mode. However, when a hydraulic pump is operated in dynamic mode, the rotating speed of the crankshaft fluctuates rapidly
due to rapid change of the working load, and instantaneous frequencies of the hydraulic pump noise are also periodic and
fluctuate rapidly. The FxLMS algorithm using an order filter is effective for ANC of the noise in which the instantaneous
frequency rapidly fluctuates. For effective application of the order filter to ANC of non-stationary noise, the filter length
should be optimally determined. |
| Key Words:
Excavator, Active noise cancellation, Engine noise, Hydraulic pump noise, Order filter, FxLMS
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Corresponding Author.
Sang-Kwon Lee , Email. 
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