Active Control of Broadband Noise Inside a Car Using a Causal Optimal Controller

Zhu, Liping; Yang, Tiejun; Li, Xinhui; Pang, Lihong; Zhu, Ming

doi:10.3390/app9081531

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Through a large number of research and analysis, it is found that the excitation frequency that can cause vehicle cab vibration to generate interior noise is about 10∼300 Hz (Guo et al, 2019). Among them, the vibration noise generated mainly by the overall structure of the cab is approximately in the frequency range of 10∼30 Hz, and the interior noise generated mainly by the metal wall panels of the cab is approximately in the frequency range of 30∼200 Hz (Abouel-Seoud, 2019; Zhang et al, 2018; Zhu et al, 2019). Usually below 250 Hz, the structural noise of the automobile is dominant (Mohanty et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Influence of the inclination angle on the sound field in an irregular enclosure containing two elastic walls

Cui

Luo

et al. 2021

Journal of Vibration and Control

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The sound field model of an irregular enclosure with two elastic walls and an inclined wall is established by the modal theory. The modal parameters of the irregular enclosure are obtained by the envelope rectangular technique. The influence of the inclination wall angle on the sound field in the irregular enclosure is discussed. When the inclination angle is increased from 0° to 45°, the resonance frequencies of the acoustic enclosure are basically reduced in the frequency range of 0∼250 Hz. When the inclination angle is increased from 0° to 45° every 15° interval, the amplitude of a certain acoustic mode itself decreases, while the amplitudes of the acoustic modes coupled to it basically increase. The acoustic potential energy peaks in the enclosure basically shift to the low frequency with the increase of the inclination angle. Furthermore, the change trend of the acoustic potential energy is regular in the low-order modes, but relatively chaotic in the high-order modes. In addition, in order to verify that the accurate description of the primary sound field is the basis of effective noise control, the two-elastic plate model is deliberately treated as one-elastic plate model, and its influence on the performance of active noise control is discussed. Also, if the multi-elastic plate model is regarded as a simplified automobile cab, the research results can be used for the preliminary acoustic design of the cab; that is, the research results can be used for the acoustic design of similar models.

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Section: Discussionmentioning

confidence: 99%

Influence of the inclination angle on the sound field in an irregular enclosure containing two elastic walls

Cui

Luo

et al. 2021

Journal of Vibration and Control

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“…A problem with using equation (17a) to determine the filter coefficients is that they will result in acausal filters (Zhu et al, 2019) because of the time delay in the physical system between the inputs to the shakers and the measured responses from the low–pass-filtered accelerometer signals. To compensate for this delay, a pure time delay normalΔ is added to the reference signal boldx to give the desired signal dk, (k=1,2).…”

Section: The Control Systemmentioning

confidence: 99%

On the adaptive synchronous control of a large-scale dual-shaker platform system

Yang

et al. 2022

Journal of Vibration and Control

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There is an ever-increasing requirement for higher power vibrating platforms to test large-scale structures. Whilst this may be achieved with a single shaker, this is an expensive option. An alternative solution is to drive a platform with two or more smaller shakers. To do this effectively, however, requires the identical amplitude and phase response of the shakers. In practice, due to manufacturing tolerances and uneven loading, this is not possible without a control system. The design and implementation of such a system is the objective of this paper. An adaptive FxLMS algorithm is used in the synchronous control of a dual-shaker system, considering the dynamic coupling between the shakers. A simulation is presented to verify the effectiveness of the control algorithm before the control system is integrated with practical a dual-shaker system driving a vibrating platform. It is shown that there are significant differences between the controlled and the uncontrolled system, demonstrating the efficacy of the control approach.

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“…Other types of noise sources, such as road noise, have a broadband nature but have some characteristics independent of the vehicle speed. In this case, also to limit stability problems, the main strategy regards the use of fixed precalculated filter coefficients [7,16]. Some more innovative algorithms can be found in the literature [17], but they are limited to experimental tests in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of Least Mean Squared-Based Adaptive Algorithms for Active Noise Control System in a Small Confined Space

Mori,

Santoni,

Fausti

et al. 2023

Applied Sciences

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Active noise control (ANC) is a technique applied to eliminate an unwanted sound by superposing a signal of equal amplitude and opposite phase, sometimes defined as an anti-noise signal, computed through an adaptive algorithm. The study described herein aims to evaluate and compare the performance of some of the most popular algorithms based on the least mean squares (LMS) approach applied to a multichannel active noise control system in a small, enclosed space. The comparison is conducted through an experimental evaluation of the ANC algorithms’ performance, carried out on a tractor cabin in a hemi-anechoic chamber, generating the unwanted sound field using a dodecahedron sound source placed outside the enclosure, emitting narrowband and broadband signals. The experimental analysis and the comparison with the results obtained in a free field condition have made it possible to show certain practical limitations when implementing the algorithms. The results show that the feed-forward systems allow for greater stability, avoiding the acoustic feedback from the control loudspeakers to the reference microphone when this is outside the cabin, while the feedback system is the slowest configuration to converge, requiring an internal modeling of the reference signal. With random signals, the feed-forward systems concentrate their performance in the range above 500 Hz, while the feedback system becomes ineffective.

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Active Control of Broadband Noise Inside a Car Using a Causal Optimal Controller

Cited by 8 publications

References 23 publications

Influence of the inclination angle on the sound field in an irregular enclosure containing two elastic walls

Influence of the inclination angle on the sound field in an irregular enclosure containing two elastic walls

On the adaptive synchronous control of a large-scale dual-shaker platform system

The Effectiveness of Least Mean Squared-Based Adaptive Algorithms for Active Noise Control System in a Small Confined Space

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