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Appl. Sci. 2019, 9(8), 1531; https://doi.org/10.3390/app9081531

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

College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
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Author to whom correspondence should be addressed.
Received: 8 March 2019 / Revised: 7 April 2019 / Accepted: 8 April 2019 / Published: 12 April 2019
(This article belongs to the Special Issue Active and Passive Noise Control)
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Abstract

This paper investigates active broadband noise control inside vehicles with a multichannel controller. The noncausal inversion of a practical nonminimum-phase secondary path is formulated, and its influence on noise-reduction performance is analyzed. Based on multiple coherence between reference signals and undesired noise, a novel formulation for identifying primary paths with correlated excitation signals is presented and a causal optimal controller is proposed. Meanwhile, the proposed controller can be used as an accurate predictor to estimate the maximal achievable noise reduction and provide a reference to improve the control systems. The robustness of the proposed algorithm is examined by varying the uncertainty of primary paths. Finally, the performance of the proposed causal optimal controller is validated using the data measured in a car. The results show that the proposed algorithm outperforms traditional algorithms and achieves a significant broadband noise reduction in time-invariant systems. View Full-Text
Keywords: active noise control; broadband noise; nonminimum-phase secondary path active noise control; broadband noise; nonminimum-phase secondary path
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Zhu, L.; Yang, T.; Li, X.; Pang, L.; Zhu, M. Active Control of Broadband Noise Inside a Car Using a Causal Optimal Controller. Appl. Sci. 2019, 9, 1531.

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