Adaptive vibration suppression of time-varying structures with enhanced FxLMS algorithm
Autor: | Wenchao Niu, Bin Li, Wei Wang, Chengzhe Zou |
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Rok vydání: | 2019 |
Předmět: |
0209 industrial biotechnology
Computer science Mechanical Engineering Vibration control Aerospace Engineering 02 engineering and technology 01 natural sciences Computer Science Applications Vibration Least mean squares filter Noise 020901 industrial engineering & automation Control and Systems Engineering Control theory 0103 physical sciences Signal Processing Harmonic Performance improvement Bang–bang control 010301 acoustics Civil and Structural Engineering |
Zdroj: | Mechanical Systems and Signal Processing. 118:93-107 |
ISSN: | 0888-3270 |
DOI: | 10.1016/j.ymssp.2018.08.009 |
Popis: | Filtered-x least mean square (FxLMS) control algorithm has been widely used for adaptive noise and vibration control. Yet, classical FxLMS controller is not applicable for time-varying system since the secondary path identified offline cannot reflect the system characteristics in real-time. In order to overcome this challenge, here online modelling of secondary path is realized by existing signals, i.e. no noise injection. In addition, FxLMS is further enhanced with variable step size that is adaptively adjusted via bang-bang controller. The adaptation of step size is aimed to achieve the balance between control efficiency and system stability. To verify the feasibility of proposed control algorithm, numerical and experimental efforts are undertaken for the buffeting suppression of vertical tail which is a typical time-varying system. Both results demonstrate that the proposed method is able to reduce the vibration response effectively for varied structures under harmonic and random excitations, while the classical FxLMS cannot. This performance improvement indicates that the online modeling of secondary path captures the system characteristics accurately and timely. Moreover, compared with the FxLMS controller with fixed step size, the control efficiency of the proposed method is also strengthened. These multiple enhancements of the performance of FxLMS controller reveal that online modeling and variable step size are favorable for adaptive vibration control of time-varying structures. |
Databáze: | OpenAIRE |
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