Frequency mismatch in narrowband active noise control

Jeon, Hyeonjin; Kim, Shin-Wook; Park, Minwoo; Lee, Woo-Geun; Chang, Tae‐Gyu; Kuo, Sen M.

doi:10.1109/icassp.2010.5495864

Cited by 8 publications

(3 citation statements)

References 10 publications

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“…The spectral distortion is mainly caused by the physical characteristics of the electro-acoustic coupling devices such as a microphone and a speaker. Within narrow frequency range of a single engine noise, the fluctuations of frequency response generally do not show more than several decibels as exemplified in [4,[14][15][16]. Critical distortion exists out of the operation range, in the sub bass frequency range lower than 50 Hz.…”

Section: ( )|mentioning

confidence: 99%

The Derivation of the Stability Bound of the Feedback ANC System That Has an Error in the Estimated Secondary Path Model

Moon¹,

Chang²

2018

Applied Sciences

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This paper investigates the stability problem of the feedback active noise control (ANC) system, which can be caused by the modeling error of the electro-acoustic path estimation in its feedback mechanism. A stability analysis method is proposed to obtain the stability bound as a form of a closed-form equation in terms of the delay error length of the secondary path, the ANC filter length, and the primary noise frequency. In the proposed method, the system's open loop magnitude and phase response equations are separately exploited and approximated within the Nyquist stability criterion. The stability bound of the proposed method is verified by comparing both the original Nyquist stability condition and the simulation results.

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Section: ( )|mentioning

confidence: 99%

The Derivation of the Stability Bound of the Feedback ANC System That Has an Error in the Estimated Secondary Path Model

Moon¹,

Chang²

2018

Applied Sciences

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“…This difference is referred to as frequency mismatch (FM), and will degrades the performance of ANC systems. The effects of FM and solution to the problems have been recently studied in (Jeon et al, 2010;Kuo & Puvvala, 2006;Xiao et al, 2005;. Another signal processing challenge is ANC for sources with nonlinear behavior.…”

Section: Review On Signal Processing Challengesmentioning

confidence: 99%

Applications of Adaptive Filtering: Recent Advancements in Active Noise Control

Tahir¹,

Mitsuhashi²,

Akinori³

2011

Adaptive Filtering Applications

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“…They explained that the worst performance of noise reduction results from increased FM in terms of the steady-state transfer function of the controller from the primary noise to the residual noise. Jeon and Chang (2010) presented the robustness of a narrowband ANC system. This research investigated the effects of FM combined with the phase error of the estimated secondary-path model.…”

Section: Frequency Mismatchmentioning

confidence: 99%

Active control of pressure pulsation in a switched inertance hydraulic system

Pan

Johnston

Hillis

2013

Proceedings of the Institution of Mechanical Engineers, Part I:

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The nature of digital hydraulic systems may cause pressure pulsation problems. For example, switched inertance hydraulic systems (SIHS), which are applied to adjust or control flow and pressure by a means that does not rely on dissipation of power, have noise problems due to the pulsed nature of the flow. An effective method to reduce the pulsation is important to improve system performance and increase efficiency. Although passive systems to reduce the noise have been shown to be effective in many situations, their attenuation frequency range is limited and they may be bulky. Furthermore, attenuation devices based on expansion chambers, accumulators or hoses are likely to be unsuitable for SIHS as they add compliance to the system and would impair the dynamic response. This thesis is concerned with issues relating to the development of an active noise canceller for attenuating the pressure pulsation which is caused primarily by pulsed flow from high-speed valves in SIHS.Active control methods are widely and successfully applied in the area of structureborne noise (SBN) and air-borne noise (ABN) cancellation. The idea is using the intentional superposition of waves to create a destructive interference pattern such that a reduction of the unwanted noise occurs. However, applications for fluid-borne noise (FBN) attenuation based on the 'Active noise control (ANC) principle' are rare due to the restriction of the hardware and experimental apparatus in previous researches.In this thesis, an adaptive controller has been developed for active control of pressure pulsation in hydraulic system. The principle of the adaptive LMS filter and details of the controller design are described and the implementation was carried out through simulation. The designed controller was applied on a vibration test rig initially prior to the hydraulic testing in order to investigate its advantages and limitations in practice.Extensive testing on a switched inertance hydraulic rig proved that the controller, which used a piezoelectric valve with fast response and good bandwidth, is effective and that it has several advantages over previous methods, being effective for low frequency cancellation, with a quick response, and is robust and versatile. II A novel method for the accurate measurement of unsteady flowrate in a pipe was proposed. This was applied and validated on a pipe, and was shown to give good results. This method solves the difficulty for measuring the unsteady flowrate currently by using easy-measured signals, such as pressures. It can be used widely for predicting the unsteady flowrate along the pipe. III ACKNOWLEDGEMENTS

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Frequency mismatch in narrowband active noise control

Cited by 8 publications

References 10 publications

The Derivation of the Stability Bound of the Feedback ANC System That Has an Error in the Estimated Secondary Path Model

The Derivation of the Stability Bound of the Feedback ANC System That Has an Error in the Estimated Secondary Path Model

Applications of Adaptive Filtering: Recent Advancements in Active Noise Control

Active control of pressure pulsation in a switched inertance hydraulic system

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