Optimal design of the response surface for the root cutting of a hydroponic lettuce harvesting tool

IF 1.9 3区工程技术 Q3 ENGINEERING, MANUFACTURING

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2024-01-09 DOI:10.1177/09544054231222046

Guohua Gao, Zhi Li, Zihua Zhang, Xiaofei Lu, Shaoyu Zhai, Zhenjiang Zhu

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Abstract

A new type of continuous harvester is designed to address the problems of high labor cost and low efficiency in the process of harvesting lettuce in greenhouse hydroponics. The designed harvester is mainly composed of three parts, namely, reciprocating cutter, driving mechanism, and belt conveyor. The response surface method is used to establish the mathematical model between the force acting on the lettuce roots and the reciprocating speed of the cutter, the inclination angle of the cutter, and the conveying speed of lettuce. The reliability of the mathematical model is verified, and the optimal parameter combination of the force on the lettuce root is obtained. Considering the actual harvesting method, the destruction rate, damage rate, and success rate of lettuce are used as the design indexes in the experiment. Results showed that the force on the lettuce stem is the smallest under the optimal parameter combination of the reciprocating motion speed of the cutting blade (100 mm/s), the inclination angle of the cutting blade (2.31°), and the conveying speed of the lettuce (64.49 mm/s). When the minimum force is 1.91 N, the destruction rate of lettuce harvest is 1.85%, the damage rate of lettuce is 3.71%, and the success rate of lettuce harvest is 94.44%. This study offers a potential solution for the automatic harvesting of hydroponic lettuce in a greenhouse.

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水培生菜收割工具切根响应面的优化设计

为解决温室水培生菜收获过程中人工成本高、效率低的问题，设计了一种新型连续收获机。所设计的收割机主要由三部分组成，即往复式切割器、驱动机构和皮带输送机。采用响应面法建立了作用在生菜根部的力与切刀往复速度、切刀倾斜角度和生菜输送速度之间的数学模型。验证了数学模型的可靠性，并得出了莴苣根部受力的最佳参数组合。考虑到实际的收割方式，将莴苣的破坏率、损坏率和成功率作为实验的设计指标。结果表明，在切割刀片往复运动速度（100 mm/s）、切割刀片倾斜角度（2.31°）和生菜输送速度（64.49 mm/s）的最佳参数组合下，生菜茎部受力最小。当最小力为 1.91 N 时，生菜收获的破坏率为 1.85%，生菜的损坏率为 3.71%，生菜收获的成功率为 94.44%。这项研究为温室中水培生菜的自动收割提供了一个潜在的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 工程技术-工程：机械

CiteScore

5.10

自引率

30.80%

发文量

167

审稿时长

5.1 months

期刊介绍： Manufacturing industries throughout the world are changing very rapidly. New concepts and methods are being developed and exploited to enable efficient and effective manufacturing. Existing manufacturing processes are being improved to meet the requirements of lean and agile manufacturing. The aim of the Journal of Engineering Manufacture is to provide a focus for these developments in engineering manufacture by publishing original papers and review papers covering technological and scientific research, developments and management implementation in manufacturing. This journal is also peer reviewed. Contributions are welcomed in the broad areas of manufacturing processes, manufacturing technology and factory automation, digital manufacturing, design and manufacturing systems including management relevant to engineering manufacture. Of particular interest at the present time would be papers concerned with digital manufacturing, metrology enabled manufacturing, smart factory, additive manufacturing and composites as well as specialist manufacturing fields like nanotechnology, sustainable & clean manufacturing and bio-manufacturing. Articles may be Research Papers, Reviews, Technical Notes, or Short Communications.