Hybrid Filtered‐x Adaptive Vibration Control with Internal Feedback and Online Identification

Yang, Lijun; Liu, Shuyong; Zhang, Haipeng; Wu, Haiping; Li, Haifeng; Jiang, Jian

doi:10.1155/2018/9010567

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Researchers have conducted extensive research on the theoretical model and generation mechanism of target radiated noise modulation spectrum [9][10][11][12][13]. This includes the development of (quasi-)periodic smooth stochastic models and the automatic detection and extraction method of the modulation line spectrum, which has garnered significant attention [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The impact of shallow waveguides on the spectral characteristics of modulated spectral lines in underwater radiated noise produced by ships

Li,

Zhang,

Lin

et al. 2024

J. Phys.: Conf. Ser.

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The modulation spectrum line spectrum of undersea radiated noise from ships is a significant characteristic in the identification of ship targets. This research presents an analysis of the impact of waveguide dispersion effect and demodulation bandwidth on the intensity of modulation line spectrum, based on the theoretical framework of square demodulation method. The physical mechanism underlying this influence is derived and discussed. The examination of collected data and numerical simulations demonstrates that the extracted modulated line spectrum intensity in an unobstructed environment effectively utilizes the carrier’s energy and generally does not exhibit any abnormal loss during propagation. However, in a shallow sea dispersive waveguide, as the propagation distance increases, a transimission loss anomaly of over 3dB occurs in the modulated line spectrum. The theoretical derivation yields implications that can offer theoretical backing for the reduction of vibration and noise in underwater targets, extraction of faint signals from high-order line spectra in the distant field, and identification of targets.

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Section: Introductionmentioning

confidence: 99%

The impact of shallow waveguides on the spectral characteristics of modulated spectral lines in underwater radiated noise produced by ships

Li,

Zhang,

Lin

et al. 2024

J. Phys.: Conf. Ser.

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“…e weight coefficients of the adaptive controller are adjusted according to the adaptive algorithm that usually is LMS algorithm, so that the mean square value of the vibration response measured by sensor converges to the minimum direction. e developed FxLMS vibration control algorithm has advantages of good convergence and strong adaptability, and does not depend on the accurate model of controlled structure, which has become one of the hotspots of AVC algorithm research [2][3][4][5]. However, in the FxLMS control algorithm, the convergence rate and steadystate error of LMS algorithm are greatly affected by the step size μ.…”

Section: Introductionmentioning

confidence: 99%

Error Signal Differential Term Feedback Enhanced Variable Step Size FxLMS Algorithm for Piezoelectric Active Vibration Control

Wang

et al. 2020

Shock and Vibration

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FxLMS (Filtered-x Least Mean Square) algorithm is widely used in the field of AVC (active vibration control) for its good convergence and strong adaptability. However, the convergence rate and steady-state error are mutually restricted for the fixed step FxLMS algorithm. Increasing step size μ to accelerate the convergence rate will result in larger steady-state error and even cause control divergence. In this paper, a new DVSFxLMS (error signal Differential term feedback Variable Step size FxLMS) algorithm is proposed by establishing nonlinear function between μ and error signal, while using differential term of the error signal as the feedback control function. Subsequently, a DVSFxLMS controller is designed to carry out the AVC simulation and experiments on cantilever beam with PSA (piezoelectric stack actuator). Simulation and experimental results show that the proposed DVSFxLMS algorithm has faster convergence rate and smaller steady-state error than the traditional FxLMS algorithm, which also has strong antinoise ability and adaptive control ability to quickly track the variable external disturbance.

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A Novel Active Control Strategy with Decentralized Decoupling and Wavelet Packet Transformation: Design and Verification

Yang

Gao²,

Yang

et al. 2021

Applied Sciences

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Active vibration control (AVC) can solve many vibration problems. However, structural vibration in underwater vehicles often involves other factors such as complex excitation and path coupling, etc. At present, the traditional algorithm (e.g., multi Filtered-x Least Mean Square, M-FxLMS) usually cannot effectively process the multi-frequency excitation and the coupling effects of the multi-secondary path, which will affect its convergence and stability to a certain extent. Consequently, a novel strategy is presented in this paper, namely, the wavelet packet transformation decentralized decoupling M-FxLMS algorithm (WPTDDM-FxLMS), which can solve the structural vibration problems mentioned above. The multi-frequency control is converted into a single-frequency line spectrum control, and the feedback compensation factor is introduced in the identification of the secondary path, both of which can simplify the multi-path control system to the parallel single-path systems. Furthermore, the WPTDDM-FxLMS algorithm is applied to the AVC in a multi-input and multi-output system (MIMO) vibration platform. Finally, the simulation and experiments show that the wavelet packet can decompose the multi-frequency excitation into a line spectrum signal, and the improvement of the decentralized decoupling and the variable step-size can effectively reduce the computation amount and increase the convergence speed and accuracy. Overall, the novel algorithm is significant for multi-path coupling vibration control. It will have certain engineering application value in underwater vehicles.

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Hybrid Filtered‐x Adaptive Vibration Control with Internal Feedback and Online Identification

Cited by 3 publications

References 20 publications

The impact of shallow waveguides on the spectral characteristics of modulated spectral lines in underwater radiated noise produced by ships

The impact of shallow waveguides on the spectral characteristics of modulated spectral lines in underwater radiated noise produced by ships

Error Signal Differential Term Feedback Enhanced Variable Step Size FxLMS Algorithm for Piezoelectric Active Vibration Control

A Novel Active Control Strategy with Decentralized Decoupling and Wavelet Packet Transformation: Design and Verification

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