Ji-Tae Kim , Huisu Hwang , Ho-Seop Lee , Young-Jun Park
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引用次数: 0
摘要
可变形地形与车轮之间的相互作用会极大地影响车轮的移动性。要准确预测车辆的机动性或优化车轮设计,就必须对这种相互作用进行分析。本研究开发了一种混合地形力学模型(HTM),利用人工神经网络(ANN)将半经验模型(SEM)和离散元素法(DEM)整合在一起。该模型克服了 SEM 和 DEM 方法固有的局限性。我们利用 DEM 仿真分析了车轮设计参数和滑移率对地形行为的影响。随后根据这些结果开发了 ANN,用于实时预测动态下沉。我们引入了一个名为 "推土角"(bulldozing angle)的新概念,用于定义动态下沉造成的额外地形-车轮接触。基于这一概念,我们预测了车轮受到的推土阻力。通过将 SEM、ANN 和 DEM 相结合,我们开发出了能够进行地形行为分析的 HTM。最后,我们对 SEM、HTM 和实际测试数据进行了对比分析。结果证实,在所有滑移率下,HTM 的预测准确性都超过了 SEM。
Development of DEM–ANN-based hybrid terramechanics model considering dynamic sinkage
The interaction between deformable terrain and wheels significantly affects wheel mobility. To accurately predict vehicle mobility or optimize wheel design, an analysis of this interaction is essential. This study develops a hybrid terramechanics model (HTM) that integrates the semi-empirical model (SEM) and the discrete element method (DEM) using artificial neural networks (ANNs). The model overcomes the limitations inherent in SEM and DEM approaches. We used DEM simulations to analyze the impact of wheel design parameters and slip ratio on terrain behavior. ANNs were subsequently developed to predict dynamic sinkage in real time based on these results. A new concept, termed bulldozing angle, was introduced to define additional terrain–wheel contact caused by dynamic sinkage. Based on this concept, we predicted the bulldozing resistance exerted on the wheel. By combining SEM, ANNs, and DEM, we developed an HTM capable of terrain behavior analysis. Lastly, we conducted a comparative analysis between the SEM, HTM, and actual test data. The results confirmed that the predictive accuracy of the HTM surpassed that of the SEM across all slip ratios.
期刊介绍:
The Journal of Terramechanics is primarily devoted to scientific articles concerned with research, design, and equipment utilization in the field of terramechanics.
The Journal of Terramechanics is the leading international journal serving the multidisciplinary global off-road vehicle and soil working machinery industries, and related user community, governmental agencies and universities.
The Journal of Terramechanics provides a forum for those involved in research, development, design, innovation, testing, application and utilization of off-road vehicles and soil working machinery, and their sub-systems and components. The Journal presents a cross-section of technical papers, reviews, comments and discussions, and serves as a medium for recording recent progress in the field.