Prediction of bruise susceptibility of harvested kiwifruit (Actinidia chinensis) using finite element method
Prediction of bruise susceptibility of harvested kiwifruit (Actinidia chinensis) using finite element method
复制标题
用有限元法预测采收的猕猴桃（Actinidia chinensis）的瘀伤敏感性
DOI：
10.1016/j.postharvbio.2019.02.013
复制
发表时间：
2019-06-01
影响因子：
7
通讯作者：
Hong, Xuezhen
中科院分区：
文献类型：
--
作者：
Du, Dongdong;Wang, Bo;Hong, Xuezhen
挫伤是水果最常见的机械损伤之一，但难以定量检测。本研究采用有限元法对猕猴桃采收后的损伤敏感性进行了预测。通过压缩试验，测定了不同成熟时间的果肉弹塑性材料性能，包括杨氏模量、生物屈服应力和切线模量。在此基础上，建立了多尺度的果皮体模型，并建立了果皮的有限元模型。采用有限元法成功地模拟了跌落场景，结果显示模拟与高速摄像机记录同时进行。基于有限元模拟的结果表明，随着成熟时间的延长，青霉的青霉伤敏感性增加，但不同落点高度对青霉伤敏感性的影响程度相近。此外，水平取向比垂直取向更容易引起瘀伤。精度分析结果表明，沙漏能量在任何模拟情景下都保持在很低的水平（< 5%）。在初始速度、最大变形长度和接触时间上，模拟与高速摄像机记录的最大误差分别为5.0%、19.0%和11.9%。与实验测量结果相比，模拟的最大误差为瘀伤体积的17.1%和瘀伤敏感性的18.3%。结果表明，有限元法预测果实损伤敏感性是可靠的，是进一步研究果实损伤的有效方法。
Bruising is one of the most common mechanical damages of fruit, but it is difficult to detect quantitatively. In this study, the finite element method (FEM) was utilized to predict the bruise susceptibility of harvested kiwifruit. The elastic-plastic material properties of fruit flesh at different ripening times, including Young's modulus, bio-yield stress and tangent modulus, were measured using the compression test. Then the fruit were modeled as a multiscale body of flesh and skin, and a finite element model was developed for dropped fruit. The drop scenarios were successfully simulated by FEM, and the results showed simultaneous activities of the simulation and high speed camera recordings. Results of FEM-based simulation showed that the bruise susceptibility increased with ripening time, but that different drop heights resulted in similar levels of bruise susceptibility. In addition, the horizontal orientation would cause higher bruise susceptibility than the vertical orientation. Results of accuracy analysis showed that the hourglass energy in any of the simulation scenarios kept in a very low level (< 5%). The maximum errors between simulation and high speed camera recordings were 5.0%, 19.0% and 11.9% for initial velocity, maximum deformed length and contact time, respectively. Compared with experimental measurement, the maximum errors of simulation were 17.1% for bruise volume and 18.3% for bruise susceptibility. The results confirmed the FEM was reliable for prediction of bruise susceptibility of the fruit, and would be an effective approach to further investigate the bruise damage.