Effective excitation conditions for the intense motion of the ginkgo seed-stem system during mechanical vibration harvesting

Zhou, Jie; Li, Xu; Zhao, Jiawei; Hang, Xiaochen; Zhou, Hu

doi:10.1016/j.biosystemseng.2022.01.014

Cited by 15 publications

(8 citation statements)

References 29 publications

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“…ω i is the ith order modal frequency, and the modal oscillation of the response is φ i . For φ i , where i ranges from 1 to N, we can transform the physical coordinates into modal coordinates [16][17][18][19].…”

Section: Modal Analysis Theorymentioning

confidence: 99%

The dynamic investigation of intrinsic vibration characteristics of a stranding machine by the finite element method

et al. 2023

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In response to the design problems of violent vibration and noise when a stranding machine is running at high speed, this project completed a motion simulation and vibration analysis based on the prototype FB-650C-2 bow-type stranding machine produced by Fuchuan Mechanical and Electrical Technology Co. The modal analysis was carried out in ANSYS to obtain the first eight orders of inherent frequencies and vibration patterns, combined with excitation force analysis to verify whether the rotating parts could avoid the resonant frequency when operating. Harmonic response analysis was carried out based on the modal state to calculate the steady-state forced vibration of the structure, and the variation curve of response value (usual deformation) with frequency and the cloud diagrams of stress distribution of each component at the rotation frequency were obtained. Suggestions for improving vibration and reducing noise were made based on the experimental and analytical results.

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Section: Modal Analysis Theorymentioning

confidence: 99%

The dynamic investigation of intrinsic vibration characteristics of a stranding machine by the finite element method

et al. 2023

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“…It has also been observed that the frequency of excitation impacts the rate at which fruits detach. A higher exciting frequency results in more efficient transfer of vibration energy from the exciter to the fruit, leading to a higher fruit detachment rate [14][15][16][17]. This seems like an apt statement; however, the amplitude of the exciting force is ignored.…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of the Double-Symmetric Eccentric Exciter for Fruit Tree Vibration Harvest

Jiao,

Luo,

Tang

et al. 2024

Agriculture

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The amplitude of excitation force from exciters used in fruit tree vibration harvesting remains constant at a given frequency, leading to poor fruit detachment ratio and tree damage. A solution has been proposed through the development of a Double-Symmetric Eccentric Exciter (DSEE). This new exciter allows for the adjustment of excitation force amplitude while maintaining a constant frequency by varying the phase angle of the DSEE. To validate the effectiveness of the DSEE, vibration tests were conducted on fruit trees using different parameter exciting forces. Acceleration sensors were employed to measure the vibration accelerations of the tree branches. The experimental results revealed that when a fixed frequency excitation force with a constant phase angle was applied to the trunk, the vibration acceleration of branches exhibited inconsistent variations due to differences in the vibration differential equation parameters of each branch. Furthermore, it was observed that increasing the phase angle of the DSEE at a fixed frequency led to larger vibration accelerations in every branch. This signifies that adjusting the phase angle of the DSEE can effectively increase the amplitude of the exciting force. Consequently, the ability to control both the amplitude and frequency of the excitation force independently can mitigate issues such as low fruit harvest rates and minimize damage to fruit trees.

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“…Modal parameter identification can provide references for dynamic response prediction (Oh et al, 2017;Li and Yang, 2007), fault diagnosis (Wang and Qi, 2016;Chandra and Sekhar, 2016), safety evaluation (Mao et al, 2019;Herman and Peeters, 2003), and structural optimization (Zhu et al, 2019c;Jung et al, 2015;Zhou et al, 2022b). As one of the famous parameter identification methods in time domain, the subspace identification method has been widely used in the fields of aerospace, mechanical, and civil engineering (Reynders, 2012;Zhu et al, 2019aZhu et al, , 2019bXu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Automatic modal identification based on similarity filtering and fuzzy clustering

Jiang

Wang

et al. 2023

Journal of Vibration and Control

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Artificially determining the model order is necessary for time domain modal identification, which affects the identification efficiency and accuracy. An automatic identification method is proposed to determine the best estimation of the model order. Based on the covariance-driven stochastic subspace identification method (SSI-COV), the singular value decomposition of the Toeplitz matrix is carried out to determine the range of the lower triangular matrix. The similarity coefficient and distance function are introduced to cluster the modes, and the poles of the false modes are removed to obtain the clustering stabilization diagram. The model order is taken as the number of clustering centers of the fuzzy c-means (FCM) algorithm, and all the poles of the stabilization diagram are clustered to get the modal parameters of each order. The effectiveness of the proposed method is verified by adopting a thin-walled cylindrical column, a triangular-prism truss in simulation, and a flexible beam in experiment. The robustness of the method is illustrated by adding white noise to the simulated response data. The advantage of the clustering stabilization diagram is demonstrated by comparing with the traditional stabilization diagram.

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Effective excitation conditions for the intense motion of the ginkgo seed-stem system during mechanical vibration harvesting

Cited by 15 publications

References 29 publications

The dynamic investigation of intrinsic vibration characteristics of a stranding machine by the finite element method

The dynamic investigation of intrinsic vibration characteristics of a stranding machine by the finite element method

Design and Testing of the Double-Symmetric Eccentric Exciter for Fruit Tree Vibration Harvest

Automatic modal identification based on similarity filtering and fuzzy clustering

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