Searched for: author%3A%22Mohajeri%2C+M.%22
(1 - 12 of 12)
document
Mohajeri, M. (author)
Due to the high demand of iron ore products in the steel industry, they have the largest share in dry bulk trading per year, above coal and grains. Approximately 9000 Cape-size bulk carriers with capacities up to 400 000 tonnes (DWT) transport the annual demand of iron ore to destination ports. Grabs are employed extensively to unload iron ore...
doctoral thesis 2021
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Mohajeri, M. (author), van den Bergh, Arjan J. (author), Jovanova, J. (author), Schott, D.L. (author)
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...
journal article 2021
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Mohajeri, M. (author), van Rhee, C. (author), Schott, D.L. (author)
This paper presents a multi-step DEM calibration procedure for cohesive solid materials, incorporating feasibility in finding a non-empty solution space and definiteness in capturing bulk responses independently of calibration targets. Our procedure follows four steps: (I) feasibility; (II) screening of DEM variables; (III) surrogate modeling...
journal article 2021
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Mohajeri, M. (author), de Kluijver, Wilbert (author), Helmons, R.L.J. (author), van Rhee, C. (author), Schott, D.L. (author)
The traditional design approach of grabs and other bulk handling equipment consists of manufacturing and testing physical prototypes. A novel design approach is to use a co-simulation of MultiBody Dynamics (MBD) and Discrete Element Method (DEM), in which the virtual prototype of a new concept interacts with bulk solids. Therefore, this study...
journal article 2021
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Schott, D.L. (author), Mohajeri, M. (author), Jovanova, J. (author), Lommen, S.W. (author), de Kluijver, Wilbert (author)
The design of machinery for handling granular materials relies mainly on empirical methods and in-house engineering knowledge. This traditional approach provides incremental improvements that are often limited. Advancements in simulation and optimization can offer a promising alternative approach. Most of the research involved in improving or...
journal article 2021
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van Kol, T.V. (author), Jovanova, J. (author), Mohajeri, M. (author), Schott, D.L. (author)
The advances of mechatronic system design and system integration have shown improvements in functionality, performance and energy efficiency in many applications across industries, from autonomous ground vehicles and drones to conveyor belts. This trend has been adopted in some industries more than others. The design of equipment to handle...
conference paper 2021
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Mohajeri, M. (author), van den Bos, Mats J. (author), van Rhee, C. (author), Schott, D.L. (author)
An ideal unit of bulk transport or storage equipment is able to handle cohesive iron ore with consistent productivity. In practice, however, uncontrollable bulk property variations affect the productivity. Therefore, it is important to understand the effect of uncontrollable variations on the process. This study quantifies variability and...
journal article 2020
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Mohajeri, M. (author), Helmons, R.L.J. (author), van Rhee, C. (author), Schott, D.L. (author)
The computation time of Discrete Element Method (DEM) simulations increases exponentially when particle size is reduced or the number of particles increased. This critical challenge limits the use of DEM simulation for industrial applications, such as powder flow in silos. Scaling techniques can offer a solution to reduce computation time. In...
journal article 2020
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Lommen, S.W. (author), Mohajeri, M. (author), Lodewijks, G. (author), Schott, D.L. (author)
Purpose: The development of bulk material handling equipment can be accelerated and made less expensive when testing of virtual prototypes is adopted. However, the modelling of a grab unloader requires a large volume (77 m3) of iron ore pellets, making the computational costs prohibitive. This paper investigates the extent to which the...
journal article 2019
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Mohajeri, M. (author), Sickler, Femke M. (author), van Rhee, C. (author), Schott, D.L. (author)
Grabs are often used for unloading bulk carriers that deliver iron ore cargoes. The grabbing process starts with cutting the free surface of the bulk iron ore. For that reason, the initial penetration depth of the grabs' knives into the material is an important success factor in their filling ratio. The resistance to penetration is influenced...
journal article 2018
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Mohajeri, M. (author)
Hot mix asphalt recycling has become common practice all over the world since the 1970s because of the crisis in oil prices. In the Netherlands, hot recycling has advanced to such an extent that in most of the mixtures more than 50% of reclaimed asphalt (RA) is allowed. These mixtures with such a high RA content are produced in a batch plant to...
doctoral thesis 2015
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Nahar, S.N. (author), Mohajeri, M. (author), Schmets, A.J.M. (author), Scarpas, T. (author), Van de Ven, M.F.C. (author), Schitter, G. (author)
One of the challenges in designing recycled asphalt mixtures with a high amount of RAP is to estimate the blending degree between RAP binder and the added virgin bitumen. The extent of blending is crucial in this case as asphalt concrete response is influenced by the final binder properties. This paper focuses on the evaluation of interaction...
journal article 2013
Searched for: author%3A%22Mohajeri%2C+M.%22
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