Active noise control in large circular duct using an error sensors plane

L’Espérance, André; Bouchard, M.; Paillard, Bruno; Guigou, Caroline; Boudreau, Alex

doi:10.1016/s0003-682x(98)00060-7

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The multichannel FXLMS algorithm [2] has been widely used for ANC application. [4][5][6] To improve the performance of quiet zone, a multichannel delay-compensated FXLMS (Filtered-X Least Mean Square) algorithm [7,8] with faster convergence rate and better performance is selected for our multichannel ANC. The proposed multichannel ANC employes one reference microphone, two cancelling speakers and four error microphones, details on it are discussed in later section.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of a quiet zone using multichannel real-time active noise control system

Mu¹,

Ko²,

Rheem³

2016

The Journal of the Acoustical Society of Korea

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Generation of a quiet zone in noisy environment is undoubtedly of considerable realistic significance. This paper describes development and implementation of a multichannel real-time active noise control (ANC) system for 3 dimensional noisy environment to enhance the quiet zone performance in terms of size and noise cancellation gain. The proposed ANC system employes a multichannel delay-compensated filtered-X least mean square (FXLMS) algorithm; its real-time implementation is designed in TMS320C6713 digital signal processor (DSP) board. The system is evaluated for cancelling various tonal frequency noises in the range from 100 to 500 Hz, and the performance is then illustrated by measuring the quiet zone in terms of sound pressure level (SPL) attenuation. Experiment results show that a quiet zone of quiet with satisfactory size and maximum 24 dB noise attenuation is successfully generated.

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Section: Introductionmentioning

confidence: 99%

Performance improvement of a quiet zone using multichannel real-time active noise control system

Mu¹,

Ko²,

Rheem³

2016

The Journal of the Acoustical Society of Korea

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“…Such an active system is used in practice to complement passive isolation. Actually, the active control of vibrations in ship structures is related mainly to: active vibration isolation (mounting system) [3]; active control of noise in ducts and pipes (exhaust stack; fuel intake and cooling system) [4,5]; active control of vibration propagation in beam-type structures (drive shaft) [6,7] and active control of enclosed sound fields (airborne radiation of the engine) [8,9,10]. The paper fits into this context, deepening the problems relating to control of vibrations on the ship structure, especially in that places where noise is annoying to the crew.…”

Section: Introductionmentioning

confidence: 99%

Vibrations Control in Cruise Ships Using Magnetostrictive Actuators

Braghin

Cinquemani

Resta

2011

Structural Dynamics, Volume 3

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A big problem in cruise ships is related to noise and vibrations generated by engines and exhaust stacks. Reduction or control of ship noise has traditionally been implemented by passive means, such as by the use of vibration isolation mounts, flexible pipe-work, and interior acoustic absorbing materials. However, these passive noise control techniques are effective mostly for attenuating high-frequency noise, while they are generally ineffective for controlling the low-frequency one. This paper presents an active vibration control of ship bulkheads based on independent modal control technique using magnetostrictive actuators. In the first part of the research, a mock up of the vibrating bulkhead is reproduced in laboratory and a mechanical model of both the system and actuators has been realized. The modal control has then been simulated focusing on actuators and sensors position and number to improve the system's controllability and observability properties and hence allow to obtain optimal performances in terms of vibration reduction. The influence of boundary conditions has also been taken into account in order to be able to predict the control logic performances in the various possible scenarios.

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Vibration Control in Ship Structures

Koko

Akpan

Berry

et al. 2002

Encyclopedia of Smart Materials

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The dominant sources of noise radiation in water are from ship engines and machinery—the propeller cavitation noise, the noise radiation from propeller blades, and the hydrodynamic pressure fluctuations induced by turbulent water flow along the ship's hull. At speeds below propeller cavitation inception, a ship's acoustic signature is generally dominated by structurally transmitted noise from onboard machinery. Reduction or control of ship noise has traditionally been implemented by passive means, such as by the use of vibration isolation mounts, flexible pipe‐work, and interior acoustic absorbing materials. However, these passive noise control techniques are effective mostly for attenuating high‐frequency noise; they are generally ineffective for controlling low‐frequency noise. There are, on the other hand, active noise control methods that have been proven to be effective in controlling low‐frequency and tonal noise. These active control methods could be used instead of, or in combination with, passive techniques, for controlling or reducing ship noise. Active noise control (ANC) involves the reduction or elimination of noise by modification of the dynamic properties of a system or by noise cancellation through linear superposition of a secondary noise field of equal but opposite strength. An active noise control system will typically consist of all or some of the following ingredients: sensors, actuators, and controllers.

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Active noise control in large circular duct using an error sensors plane

Cited by 5 publications

References 11 publications

Performance improvement of a quiet zone using multichannel real-time active noise control system

Performance improvement of a quiet zone using multichannel real-time active noise control system

Vibrations Control in Cruise Ships Using Magnetostrictive Actuators

Vibration Control in Ship Structures

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