Time-domain filtered-x-Newton narrowband algorithms for active isolation of frequency-fluctuating vibration

Li, Yan; He, Liang; Shuai, Changgeng; Wang, Fei

doi:10.1016/j.jsv.2015.12.019

Cited by 23 publications

(5 citation statements)

References 12 publications

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“…By analyzing the vibration characteristics of the excitation source, blocking the vibration transmission or optimizing the structure of the excitation source to keep its frequencies far away from the natural frequencies of the research object, the resonance can also be avoided. For example, the engine was the main source of excitation that affects the vibration of the tractor [40] , and the transmission of the unbalanced inertia force of the engine on the tractor can be effectively reduced by installing a vibration isolator between the tractor engine and the chassis [41,42] . In addition, the topology optimization method is used to optimize the header frame to reduce resonance and realize lightweight design, which provided lightweight design basis for reducing the vibration of header frame, and provide reference for other types of machinery in the field of agricultural machinery to reduce weight and vibration.…”

Section: Comparison Of Results Before and After Optimizationmentioning

confidence: 99%

Vibration analysis and topology optimization of the header of full-feeding rice combine harvester

Tang,

Xu,

Zhu

et al. 2023

International Journal of Agricultural and Biological Engineering

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The header frame of full-feeding rice combine harvester was characterized by severe vibration due to the excitation force generated by the movement of each working part. In order to solve the problem, the parametric model of the header frame was established, and the accuracy of the finite element model was verified by comparison of the results of the free modal analysis and free vibration modal test based on Eigensystem Realization Algorithm (ERA). Then the constrained modal frequencies were calculated and compared with the external excitation source frequencies, the results showed that the first and eighth order modal natural frequencies were coupled with the excitation frequencies of the threshing cylinder and the engine respectively, which were apt to resonate. To avoid resonance and achieve lightweight design, topology optimization, and finite element analysis were carried out. The optimization results showed that the strength and rigidity meet the requirements and the weight was 14.17% lower than before. The first and eighth order modal natural frequencies were far away from the excitation frequencies range of the threshing cylinder and engine, and the frequencies were far away from the range of each excitation frequency, which effectively avoided the occurrence of resonance. Field experiments showed that the peak value of the vibration acceleration in the three directions of the 8 measuring points of the optimized header frame was significantly reduced, which effectively reduced the vibration of the header frame during harvest. This study provides a method for obtaining the vibration characteristics of key components of agricultural machinery and provides a reference for the weight and vibration reduction of header frames of rice, wheat, rape, and other crop combine harvesters.

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Section: Comparison Of Results Before and After Optimizationmentioning

confidence: 99%

Vibration analysis and topology optimization of the header of full-feeding rice combine harvester

Tang,

Xu,

Zhu

et al. 2023

International Journal of Agricultural and Biological Engineering

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“…The centralized control was first proposed as the multiple error (ME) ANC algorithm in Elliott's 1987 paper [28]. The MEANC algorithm could also be implemented by FxLMS or its variants [29][30][31][32] if the noise signal, known as reference signal, is collected. MEANC optimizes the residue over all channels such that each controller updates the coefficients by using data from all error microphones (see the cost function in Table 3 and diagram for the centralized ANC system with K loudspeakers/error microphones in Figure 6a).…”

Section: Centralized Fxlms Decentralized Fxlms Distributed Fxlmsmentioning

confidence: 99%

Some Practical Acoustic Design and Typical Control Strategies for Multichannel Active Noise Control

Chu

Sun

et al. 2022

Applied Sciences

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Active noise control (ANC) systems usually involve a large number of loudspeakers and error microphones in order to achieve noise reduction over an extended region of space. Although fundamentals of ANC theory and principles of ANC methods have been well-established over the past 40 years, applications of this technology are facing new challenges. A larger quiet zone with better noise reduction performance is always desirable in a variety of real-life scenarios. This paper presents several important factors that affect the performance of multichannel ANC systems in some popular applications such as windows with natural ventilation and quiet-zone around heads. The factors affecting acoustic design include the reflection of a baffle plate, arrangement of error sensors in open areas, and so on. In addition, different control strategies are compared and analyzed, including centralized, decentralized, and distributed strategies. All these strategies are discussed from the signal processing side, which should be considered after a proper acoustic design. One of the important aims of this paper is to provide practical guidance for acoustic design and discuss several typical control strategies for multichannel ANC systems.

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“…Slow convergence and even divergence will occur if the coupling in control channels is not properly dealt with (Xie et al, 2020a). Some control algorithms considering the crosscoupling effect (Kasbekar et al, 2015;Li et al, 2016;Shi et al, 2019;Xie et al, 2020aXie et al, , 2020b have been employed to remove the risk of divergence. However, the computational complexity will increase exponentially with the number of channels (Shi et al, 2019) and pose sharp challenges to a digital controller.…”

Section: Introductionmentioning

confidence: 99%

Active/passive vibration isolation with multi-axis transmission control: Analysis and experiment

Ren

Xie

et al. 2022

Journal of Vibration and Control

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It is necessary to cut off all vibration transmission paths for an active vibration isolation system. A greater suppression of local responses will result in a better overall attenuation. In order to realize impediment at possible transmission paths, a new scenario of multi-axis transmission control is proposed, in which the active/passive isolator attenuates vibration transmission at multi-degrees of freedom by vertical and horizontal actuators mounted orthogonally on the intermediate inertial mass. This scenario is able to weaken the cross-coupling of control action between isolators by the passive parts. In order to investigate the characteristics of multi-axis transmission control, the dynamic model of a partitioned isolation system with one active/passive isolator is established and the involved transmission control is analyzed. The numerical results show that the foundation vibration can be attenuated along with the decrease of vibrations of the intermediate inertial mass. It is further revealed by experimental results that the multi-axis transmission control at the intermediate inertial mass is necessary to achieve sufficient vibration attenuation in the foundation, whereas the control in a single axis is ineffective. These verified results imply that the active/passive isolation with local transmission path control makes it possible to apply decentralized control in a large active vibration isolation system.

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Time-domain filtered-x-Newton narrowband algorithms for active isolation of frequency-fluctuating vibration

Cited by 23 publications

References 12 publications

Vibration analysis and topology optimization of the header of full-feeding rice combine harvester

Vibration analysis and topology optimization of the header of full-feeding rice combine harvester

Some Practical Acoustic Design and Typical Control Strategies for Multichannel Active Noise Control

Active/passive vibration isolation with multi-axis transmission control: Analysis and experiment

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