Print Email Facebook Twitter Systematic design optimization of grabs considering bulk cargo variability Title Systematic design optimization of grabs considering bulk cargo variability Author Mohajeri, M. (TU Delft Transport Engineering and Logistics) van den Bergh, Arjan J. (Student TU Delft) Jovanova, J. (TU Delft Transport Engineering and Logistics) Schott, D.L. (TU Delft Transport Engineering and Logistics) Date 2021 Abstract Ship unloader grabs are usually designed using the manufacturer's in-house knowledge based on a traditional physical prototyping approach. The grab performance depends greatly on the properties of the bulk material being handled. By considering the bulk cargo variability in the design process, the grab performance can be improved significantly. A multi-objective simulation-based optimization framework is therefore established to include bulk cargo variability in the design process of grabs. The primary objective is to reach a maximized and consistent performance in handling a variety of iron ore cargoes. First, a range of bulk materials is created by varying levels of cohesive forces and plasticity in the elasto-plastic adhesive DEM contact model. The sensitivity analysis of the grabbing process to the bulk variability allowed three classes of iron ore materials to be selected that have significant influence on the product performance. Second, 25 different grab designs are generated using a random sampling method, Latin Hypercube Design, to be assessed as to their handling of the three classes of iron ore materials. Of this range of grab designs, optimal solutions are found using surrogate modelling-based optimization and the NSGA-II genetic algorithm. The optimization outcome is verified by comparing predictions of the optimization algorithm and results of DEM-MBD co-simulation. The established optimization framework offers a straightforward and reliable tool for designing grabs and other similar equipment. Subject Cohesive iron oreDEM-MBD co-simulationGrabsMulti-objective optimizationSustainable design To reference this document use: http://resolver.tudelft.nl/uuid:deb8bce0-2d21-4c4b-9f45-d1601744771a DOI https://doi.org/10.1016/j.apt.2021.03.027 ISSN 0921-8831 Source Advanced Powder Technology, 32 (5), 1723-1734 Part of collection Institutional Repository Document type journal article Rights © 2021 M. Mohajeri, Arjan J. van den Bergh, J. Jovanova, D.L. Schott Files PDF 1_s2.0_S0921883121001606_main.pdf 2.72 MB Close viewer /islandora/object/uuid:deb8bce0-2d21-4c4b-9f45-d1601744771a/datastream/OBJ/view