Evaluation of measurement value and uncertainty of sound pressure level difference obtained by active device noise reduction

Wrona, Stanisław; Pawełczyk, Marek

doi:10.1016/j.measurement.2016.10.050

Cited by 20 publications

(8 citation statements)

References 14 publications

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“…The average sound pressure level reduction at monitoring microphones, not used for control, was equal to 5.3 dB for 1200 rpm and 4.0 dB for 1000 rpm. Both results from monitoring microphones and hand-held sound pressure meter confirmed that the noise is reduced globally in the whole room [26]. Figures 8 and 9 show the Power Spectral Densities (PSDs) of signals from microphones and control signals, respectively.…”

Section: Resultsmentioning

confidence: 56%

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Performance Evaluation of Active Noise Control for a Real Device Casing

2020

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Reduction of noise generated by devices is an important problem, both in industrial environments where high sound pressure levels may damage hearing, and in households where the sound pressure level is usually moderate, but may cause discomfort and stress. Classically used passive methods often have poor performance for low frequencies. Alternatively, active control can be used to improve noise reduction in this frequency range. In the proposed approach, noise generated by devices may be reduced by controlling vibrations of the casing. The authors previously confirmed the performance of the proposed active control approach using a dedicated noise-canceling casing. Herein, we describe further development and application of the method to an off-the-shelf washing machine. Electrodynamic actuators were installed on four walls of the washing machine. The performance of the control systems was experimentally evaluated during the real spinning phase and the results are reported here.

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Section: Resultsmentioning

confidence: 56%

“…They were placed at 1.7 m above the floor. The observed noise reduction level at a specific location significantly depends on chosen location due to room acoustics [26]. At some locations, the room acoustics may cause even destructive interference of the primary noise.…”

Section: Methodsmentioning

confidence: 99%

Performance Evaluation of Active Noise Control for a Real Device Casing

2020

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“…The room microphones are placed in four arbitrarily selected irregular locations in the enclosure, at greater distances from the casing. Each position corresponds to a possible location of a listener [16]. To control vibrations of the active casing, inertial mass actuators EX-1 are used.…”

Section: The Laboratory Setupmentioning

confidence: 99%

Active Structural Acoustic Control of an Active Casing Placed in a Corner

et al. 2019

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Electric appliances used in workplaces and everyday life often generate a low-frequency noise, which affects human body systems. Passive methods employed to reduce noise are not effective at low frequencies. The classical approach to active noise control practically involves the generation of local zones of quiet, whereas at other areas the noise is reinforced. Moreover, it usually requires a large number of secondary sound sources. Hence, an active casing approach has been developed. The active casing panels’ vibrations are controlled to reduce the device noise emission. Efficiency of this method has been previously confirmed by the authors and the results have been reported in multiple journal publications. However, in the previous research experiments, the active casing was placed at a distance from the enclosure walls. In this research, the active casing is located in a corner and such placement is intentionally used to facilitate the active control system’s operation. The noise reduction performance is investigated at multiple configurations, including a range of distances from the corner and different error microphone arrangements. The analysis of both primary and secondary paths is given. Advantages and drawbacks of different active casing configurations are presented and discussed.

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“…Under certain conditions, it can provide global noise reduction with low energy demand. However, this approach is out of the scope of this paper and the reader is referred to other publications dedicated to it [15,16,17,18].…”

Section: The Exemplary Scenariomentioning

confidence: 99%

Shaping zones of quiet in a large enclosure generated by an active noise control system

Wrona

Diego

Pawełczyk

2018

Control Engineering Practice

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Performance of an Active Noise Control (ANC) system strongly depends on sensors and actuators spatial arrangement. It determines both achieved Noise Reduction (NR) levels and spatial distribution of obtained zones of quiet, making it an essential problem. However, if the acoustic field in the enclosure can be appropriately modelled, then optimization algorithms can be employed to find efficient configuration of the ANC system, enhancing its performance according to a formulated cost function and constraints. This paper proposes a complete method for enhancing NR levels and shaping zones of quiet generated with an ANC system by optimization of sensors and actuators arrangement. A Memetic Algorithm (MA) is utilized. The MA itself and its proposed operators are described. The optimization problem formulation is derived and discussed. As a control algorithm, Distributed Multiple Error Filtered-x Least Mean Square (DMEFxLMS) is used. Extensive simulation results are presented for an exemplary real enclosure. The model of the acoustic environment has been obtained by real-world experiments, resulting in identification of 36864 acoustic responses in total. Practically feasible cost function and constraints are evaluated. Advantages and limits of the method are pointed out and discussed.

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Evaluation of measurement value and uncertainty of sound pressure level difference obtained by active device noise reduction

Cited by 20 publications

References 14 publications

Performance Evaluation of Active Noise Control for a Real Device Casing

Performance Evaluation of Active Noise Control for a Real Device Casing

Active Structural Acoustic Control of an Active Casing Placed in a Corner

Shaping zones of quiet in a large enclosure generated by an active noise control system

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