Modal Analysis and Experiment of a Lycium barbarum L. Shrub for Efficient Vibration Harvesting of Fruit

Jian Zhao, Satoru Tsuchikawa, Te Ma, Guangrui Hu, Yun Chen, Zhiwei Wang, Qingyu Chen, Zening Gao and Jun Chen
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Jian Zhao: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Xianyang 712100, China
Satoru Tsuchikawa: Graduate School of Bioagricultural Sciences, Nagoya University, Furo-Cho, Chikusa, Nagoya 464-8601, Japan
Te Ma: Graduate School of Bioagricultural Sciences, Nagoya University, Furo-Cho, Chikusa, Nagoya 464-8601, Japan
Guangrui Hu: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Xianyang 712100, China
Yun Chen: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Xianyang 712100, China
Zhiwei Wang: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Xianyang 712100, China
Qingyu Chen: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Xianyang 712100, China
Zening Gao: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Xianyang 712100, China
Jun Chen: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Xianyang 712100, China

Agriculture, 2021, vol. 11, issue 6, 1-14

Abstract: The most common harvesting method of Lycium barbarum L. ( L. barbarum ) is manual harvesting, resulting in low efficiency and high cost. Meanwhile, the efficiency of vibration harvesting, which is considered an efficient mechanical harvesting method, can be significantly improved if the optimized resonance frequency of the shrub can be obtained. To vibration harvest fruit efficiently, a 3D model of the shrub was established based on measurements of the shape parameters, and material mechanics models of the branches were established based on physical tests. The modal analysis of the shrub based on finite element method (FEM) simulation was performed to obtain the range of resonance frequency, and the modal experiment of the shrub using acceleration sensors and an impact hammer was conducted to obtain the accurate resonance frequency. Based on the results of the modal analysis and experiment, the optimized resonance frequency was determined to be 2 Hz. The field experiment showed that the fruit fell off when the branches were vibrated at this frequency. The results provide the design basis for the efficient vibration harvesting of L. barbarum .

Keywords: L. barbarum; modal analysis; material mechanics model; resonance frequency; FEM simulation; vibration harvesting; precision agriculture; agricultural machinery (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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