周俊,孙文涛,梁子安.收获期菊芋根-块茎离散元柔性模型研究[J].农业机械学报,2023,54(10):124-132.
ZHOU Jun,SUN Wentao,LIANG Zi'an.Construction of Discrete Element Flexible Model for Jerusalem Artichoke Root-Tuber at Harvest Stage[J].Transactions of the Chinese Society for Agricultural Machinery,2023,54(10):124-132.
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| 收获期菊芋根-块茎离散元柔性模型研究 [下载全文] |
| Construction of Discrete Element Flexible Model for Jerusalem Artichoke Root-Tuber at Harvest Stage [Download Pdf][in English] |
| 投稿时间：2023-03-06 |
| DOI：10.6041/j.issn.1000-1298.2023.10.011 |
| 中文关键词: 菊芋 收获 根-块茎 离散元法 柔性模型 参数标定 |
| 基金项目:国家重点研发计划项目(2019YFD0900701)和江苏省现代农机装备与技术示范推广项目（NJ2021-36) |
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| 中文摘要:目前，菊芋机械化收获过程中的清选及输送等环节作业参数设定缺乏适用的理论依据，以收获期菊芋根-块茎为研究对象，基于离散元方法建立了一种能反映根须柔性和块茎脱落力学特性的粘结模型并对其相关参数进行了标定。首先通过物理试验确定了菊芋根-块茎本征参数、基本接触参数及相关力学参数，然后在此基础上利用Hertz-Mindlin with bonding V2接触模型构建了菊芋根-块茎粘结模型，并通过单因素试验和响应曲面试验，分别标定了菊芋根颗粒之间和根与块茎颗粒之间法向粘结刚度、切向粘结刚度、临界法向应力、临界切向应力等粘结模型参数。菊芋根须三点弯曲及根-块茎拉伸试验结果表明，根须弯曲弹性模量仿真结果与实际测量值相对误差为4.29%；菊芋根-块茎抗拉力仿真结果与实际测量值相对误差为7.72%；菊芋块茎脱落试验结果表明，仿真试验与菊芋收获机实际田间作业相比，滚筒筛转速对菊芋块茎脱落率影响趋势一致，筛内物料筛分规律相符。所构建的菊芋根-块茎模型可用于菊芋机械化收获相关环节的分析研究。 |
| ZHOU Jun SUN Wentao LIANG Zi'an |
| Nanjing Agricultural University |
| Key Words:Jerusalem artichoke harvesting root-tuber discrete element method flexible model parameter calibration |
| Abstract:Currently, there is a lack of theoretical basis for setting operational parameters such as cleaning and conveying Jerusalem artichoke tubers during mechanical harvesting. A bonding model that reflected the root flexibility and tuber detachment mechanical characteristics was established by using the discrete element method, and its relevant parameters were calibrated. In the first step, the intrinsic, basic contact and associated mechanical parameters were determined through laboratory experiments. Next, based on these parameters, Hertz-Mindlin with bonding V2 contact model and Meta particle function was used to establish the flexible model for Jerusalem artichoke root-tuber. Single-factor experiment and response surface methodology were used to determine the bonding parameters such as normal stiffness, tangential stiffness, normal strength, and tangential strength between Jerusalem artichoke root particles and between root and tuber particles. Subsequently, the three-point bending and root-tuber tensile simulation experiments were carried out on the determined parameters. The error between the simulation results and the physical experiment values of the root flexural modulus was 4.29%. The error between the simulation results and the physical experiment values of the maximum allowable tensile resistance between the root and tuber was 7.72%. Finally, the calibrated model was used to simulate the Jerusalem artichoke tuber harvesting operation. The effect of drum screen rotary speed on the tuber shedding rate in the simulation and field experiments had a similar trend. The research demonstrated that the method used to establish the model was correct, and the calibration parameters were deemed reliable. As a result, the established Jerusalem artichoke root-tuber flexible model can be effectively employed for further simulation research pertaining to the mechanized harvesting process of Jerusalem artichokes. |
Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.
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