Authors

Abstract

Currently, transplanting claws may cause damage to seedling stems or roots during the seedling extraction process. In this study, a dynamic simulation model of the seedling extraction process using transplanting claws was established and analyzed. Foam thickness and width along with the clamping torque were selected as experimental factors, while stem stress and deformation were used as evaluation indicators in a Box–Behnken response surface design. Based on variance analysis of the regression model, the significance of each factor and their interactions was determined, and corresponding regression equations were established. Subsequently, a multi-objective optimization of the regression models was performed using the NSGA-II algorithm, and optimal solutions were identified based on the Pareto frontier. The results show that the optimal parameter combination is obtained at a foam thickness of 6 mm, a foam width of 6.4 mm, and a clamping torque of 0.4 N·m. Under these conditions, the stem stress is 3.1893 MPa and the deformation is 0.8024 mm, which are in close agreement with the predicted values. These findings demonstrate that the combination of the NSGA-II algorithm and the Box–Behnken response surface method is effective for optimizing transplanting claw parameters. However, as this study is based solely on simulation, experimental validation using actual tomato seedlings is required before practical application, which will be addressed in future work.

Abstract in Chinese

目前，移栽爪取苗过程中容易对茎秆或苗坨造成损伤。本文通过建立移栽爪取苗过程动力学仿真模型并且进行仿真分析。以泡棉厚度、宽度、夹持扭矩为试验因素，以取苗成功后番茄茎秆被夹持处所受应力与形变量为试验指标进行 Box-Behnken 组合试验。根据回归模型的方差分析，确定各试验因素及其交互作用的显著性，建立试验指标对应的回归方程。基于 NSGA-Ⅱ算法对回归方程进行多目标优化，求解优化目标的帕累托（Pareto）前沿图。当泡棉厚度为 6mm，泡棉宽度为 6.4mm，夹持扭矩为 0.4N∙m 时为最优解，茎秆所受应力为3.1893MPa、形变量为0.8024mm，与预测值接近，证明NSGA-Ⅱ结合响应面法在移栽爪优化的可行性。