A fast vibration-level adjustment method for low-frequency vibration calibration based on modified filtered-x least mean square algorithm

Li, Chao; Chen, Zhangwei

doi:10.1177/0020294019881727

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…For the Fx-LMS with fixed step, the steady-state and convergence have restricted each other. To reduce the time of the vibration-level adjustment in low-frequency band, Li and Chen (2020) proposed a modified Fx-LMS algorithm. It does not require a pre-identification of the controlled system and has reduced calculated quantities.…”

Section: Introductionmentioning

confidence: 99%

Active vibration hybrid control strategy based on multi-DOFs piezoelectric platform

Pu,

Fu,

Wang

et al. 2023

Journal of Intelligent Material Systems and Structures

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With the increasing requirements for vibration isolation in multiple degrees of freedom (multi-DOFs), active control strategy is becoming more meaningful. However, the vibration isolation performance is limited by the time delay of feedback control, and cannot meet higher requirements. Therefore, this paper proposes a multi-DOFs active vibration hybrid control (AVHC) strategy based on a piezoelectric platform. The AVHC integrates the adaptive feedforward control based on the modified recursive least squares (MRLS) algorithm, and the feedback control based on the integral force feedback (IFF) algorithm. To achieve advanced response, the ground-based vibration signal is offset by the MRLS algorithm. To further reduce the coupling of multi-DOFs, the feedback and feedforward coordinates are fused through the matrix transformation, and the signals are linearly superimposed by the AVHC. The experimental results show that the AVHC can further reduce the resonance peaks of the three translational directions ( X/ Y/ Z) compared with the feedback (FB) control. The resonance peaks are reduced from 14.6 dB (FB) to 3.11 dB (AVHC), from 14.56 dB (FB) to 5.14 dB (AVHC), and from 12.44 dB (FB) to 3.78 dB (AVHC) in X/ Y/ Z directions, respectively. The attenuation rates are improved by 73.36%, 66.19%, and 63.10% in X/ Y/ Z directions, respectively.

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Section: Introductionmentioning

confidence: 99%

Active vibration hybrid control strategy based on multi-DOFs piezoelectric platform

Pu,

Fu,

Wang

et al. 2023

Journal of Intelligent Material Systems and Structures

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show abstract

“…However, the low-frequency vibration of an electromagnetic standard vibration actuator (EVA) can generally be divided into three frequency bands of displacement characteristics, velocity characteristics, and acceleration characteristics, and the displacement feedback does not have the ability to effectively suppress waveform distortion in each frequency band (Zhang et al, 2017). Moreover, the time-domain feedback control (Chen and Liaw, 1999) and high harmonic active injection method (Li and Chen, 2020; Qiu et al, 2021), and modern control methods such as fuzzy control (Rana, 2011), robust control (Ito et al, 2000; Uchiyama et al, 2009), and x-filtered adaptive LMS algorithm (Li et al, 2022) have all achieved effective improvements of vibration waveforms. All the methods above are realized on the premise that there is an appropriate sensor capable of detecting low-frequency vibration.…”

Section: Introductionmentioning

confidence: 99%

Waveform harmonic suppression technology for electromagnetic standard vibration actuators based on current feedback control

Cui

Bian

et al. 2022

Journal of Vibration and Control

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To realize high-precision calibration of vibration sensors, the total harmonic distortion (THD) of the output waveform of a standard vibration actuator should be as small as possible, so a harmonic suppression technique based on current feedback control is presented. A low-cost, easy-to-implement feedback control loop of driving current is established in an electromagnetic standard vibration actuator (EVA), and the rationality of driving current in place of acceleration in the acceleration characteristic frequency band to achieve the feedback is analyzed. The influence of different values of the key parameters on the system is studied, and the acceleration characteristic frequency band of low-frequency vibration is effectively extended so that the THD of the output waveform is immensely alleviated. The effectiveness of the proposed method is verified by experiments and compared with traditional control methods, the harmonic distortion of acceleration waveform can be reduced by more than 40% without using any feedback sensors, which proves the superiority of the current feedback control method.

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“…A narrowband FxLMS algorithm (Kuo and Morgan, 1999) can be used to cancel the harmonics. However, one of the prominent drawbacks of the FxLMS algorithm in multiple narrowband disturbance cancellation is that two convolution operations of a high-order finite impulse response (FIR) filter must be carried out for each narrowband disturbance, which increases much computational consumption especially when the number of the harmonics is large (Li and Chen, 2020).…”

Section: Introductionmentioning

confidence: 99%

A novel adaptive control algorithm for the rejection of harmonics in a standard vibrator

Mao

Chen

2020

Journal of Vibration and Control

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Because of the nonlinear factors in the standard vibrators, the output waveform of the vibrators is usually distorted, especially in the low-frequency band. Traditionally, the harmonic distortion is suppressed by improved design of the vibrator and feedback control. However, these approaches can just suppress the harmonics to some extent. There are still residual harmonic components which cannot be eliminated. In this article, an adaptive control algorithm is proposed to eliminate the harmonics of the vibration calibration system by injecting harmonic components into the control input signal. Weighting vectors of the harmonic components are adaptively updated based on a modified filtered-x least mean square (MFxLMS) algorithm, which has both strong robustness and much less computational complexity. The convergence properties of the proposed MFxLMS algorithm are investigated, and it is further implemented in a real-time controller. Experimental results on a standard vibrator show excellent performances for harmonic cancellation. The harmonic distortion is close to 0% after the implementation of the proposed algorithm.

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A fast vibration-level adjustment method for low-frequency vibration calibration based on modified filtered-x least mean square algorithm

Cited by 8 publications

References 28 publications

Active vibration hybrid control strategy based on multi-DOFs piezoelectric platform

Active vibration hybrid control strategy based on multi-DOFs piezoelectric platform

Waveform harmonic suppression technology for electromagnetic standard vibration actuators based on current feedback control

A novel adaptive control algorithm for the rejection of harmonics in a standard vibrator

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