作者: Dingena L. Schott , Stef W. Lommen , Ronald van Gils , Job de Lange , Martijn M. Kerklaan
DOI: 10.1016/J.POWTEC.2015.03.012
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摘要: Abstract Designing more efficient excavating equipment in bulk handling is a complex task as accurate analytical models for the interaction between material and are rare. Particle based simulations of executed by Discrete Element Method (DEM) offer an approach evaluating performance prototypes. However, due to their high computational costs, these often require use particles larger than reality. Until now it uncertain what extent this simplification affects predicted equipment, literature on topic scarce. This work investigates effect scaling particle size excavation motion characteristic such grabs, reclaimers bulldozers. was assessed comparing required force different sizes using experiments. First applicable laws were derived and, those results, experimental setup built measuring excavate bucket geometry. Glass beads selected representative material, since they can easily be obtained several sizes. For comparison also experiments with gravel iron ore performed. The studied three scaled combinations (scales A, B C), separately changing speed glass beads. Based tests concluded that scale factor not constant during law (force ~ (characteristic length)3) motion. current used one single every dimension, therefore recommended investigate approaches taking into account dimensions separately. In addition, revealed there no (d) blade thickness (t) ratio measured energy smallest buckets (A B), however largest worthwhile further region d/t > 1,5. specifically interest when DEM reduce time increasing