Iris Ramaj, Sebastian Romuli, Steffen Schock, Joachim Müller
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引用次数: 0
摘要
本研究采用离散元素法 (DEM) 作为计算方法,分析小麦(Triticum aestivum L., cv. 'Pionier')在压缩荷载下的体积行为。实验室压缩设备是获取压缩试验数据的基础。为确保精确的 DEM 预测,对两种不同含水量(12.4% 和 25.4% w.b.)的麦粒的物理、机械和相互作用特性进行了实验测定。构建了五个颗粒模型来表示麦粒的几何形状,其中由五个子球体组成的模型被认为是最合适的,确保了计算复杂性和模拟精度之间的最佳平衡。将 DEM 模拟的体积压缩结果与实验数据进行了比较,结果表明,在指定的适用范围内,体积应变、体积密度增加和体积可压缩性都非常吻合。模拟为了解作用在单个颗粒上的力和变形的时空变化提供了有价值的见解,从而加深了对不同压缩水平下体积行为的理解。研究发现,含水量对颗粒压缩力、变形能力和体积压缩特性有重大影响。总之,这项研究证明了 DEM 在预测小麦压缩下的体积行为方面的巨大潜力,为实际储藏和处理过程提供了宝贵的信息。
Discrete element modelling of bulk behaviour of wheat (Triticum aestivum L.) cv. ‘Pionier’ during compressive loading
In this study, the Discrete Element Method (DEM) was employed as a computational approach to analyse the bulk behaviour of wheat (Triticum aestivum L., cv. ‘Pionier’) under compressive loading. A laboratory compression apparatus was utilised as a basis for the acquisition of data from compression tests. To ensure accurate DEM predictions, the physical, mechanical, and interaction properties of wheat kernels were experimentally determined for two different moisture contents (12.4% and 25.4% w.b.). Five particle models were constructed to represent the geometric shape of the kernel, with the model composed of five sub-spheres identified as the most suitable, ensuring an optimal balance between computational complexity and simulation accuracy. The bulk compression results from DEM simulations were compared to experimental data, revealing a good agreement for volumetric strain, bulk density increase, and bulk compressibility within the specified range of applicability. Simulations provided valuable insights into temporal and spatial variations of forces and deformations acting on individual particles, thereby enhancing the understanding of bulk behaviour at different compression levels. The moisture content was found to significantly affect the particle compressive forces, deformation capabilities, and bulk compression characteristics. In conclusion, this study demonstrated the great potential of DEM in predicting the bulk behaviour of wheat under compression, providing valuable information for practical storage and handling processes.
期刊介绍:
Biosystems Engineering publishes research in engineering and the physical sciences that represent advances in understanding or modelling of the performance of biological systems for sustainable developments in land use and the environment, agriculture and amenity, bioproduction processes and the food chain. The subject matter of the journal reflects the wide range and interdisciplinary nature of research in engineering for biological systems.