https://doi.org/10.4081/jae.2023.1466

Fuzzy neural network PID control design of camellia fruit vibration picking manipulator

Vol. 54 No. 2 (2023)
    Published: 1 August 2023
    Camellia fruit picking machine, vibration frequency PID control, fuzzy wavelet neural network
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    Appendix: 45
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    Authors

    Ziyan Fan
    956931430@qq.com
    https://orcid.org/0000-0002-4781-666X
    College of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha, China.
    Lijun Li
    College of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha, China.
    Zicheng Gao
    College of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha, China.

    Due to the growth characteristics of the flowers and fruits of camellia in the same period, the vibrating camellia fruit picking machine needs to ensure the constant rotational speed of the vibrating hydraulic motor when the picking mechanism is operating, to achieve a constant vibration frequency, to ensure that the camellia fruit can smoothly fall off the branches through vibration. In contrast, the camellia fruit does not fall off. In this regard, this paper deduced the state space equation of the camellia fruit picking machine’s valve-controlled vibrating hydraulic motor system and designed a fuzzy wavelet neural network PID controller (FWNN PID controller) based on the traditional incremental PID control principle. Then the designed vibration picking manipulator control system was simulated under no-load, 5 s load conditions, and load start conditions with MATLAB/Simulink, a general PID controller and a fuzzy RBF neural network PID controller (FRBFNN PID controller) were used to contrast with it. The results show that the general PID controller has a slow response speed and poor robustness, while fuzzy neural network PID controllers (including FWNN PID controller and FRBFNN PID controller) have a fast response speed and strong robustness, which can well meet the requirements of a specific vibration frequency. Finally, a field test was carried out. The results show that the FWNN PID control is better than the FRBFNN PID control. Furthermore, the FWNN PID controller obviously reduced the drop rate of camellia flowers within 6% while ensuring the picking efficiency above 90%, which can well meet the needs of the camellia fruit picking operation.

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    How to Cite

    Fan, Z., Li, L. and Gao, Z. (2023) “Fuzzy neural network PID control design of camellia fruit vibration picking manipulator”, Journal of Agricultural Engineering, 54(2). doi: 10.4081/jae.2023.1466.
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