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Rutten, Martijn (author)Grabs are essential in the process of unloading a bulk carrier by grabbing bulk material such as iron ore from the cargo hold. Due to varying operational conditions, the consistency and the amount of payload can vary significantly. One of the largest varying operational conditions is the occurrence of irregular bulk surfaces. Therefore, it is...master thesis 2023
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van Selm, GertJan (author)Due to the constant growth of global maritime shipping, the optimization of grabs used for unloading bulk carriers is more and more relevant. Especially for a coarse material like limestone, the average payload can be improved, by altering the grab design. It is suggested that the penetration and cutting depth of a grab can be improved, which...master thesis 2023
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Houweling, Mark (author)Bulk handling grabs are often used for unloading bulk materials such as iron ore and coal from bulk carrying ships. To improve and compare virtual simulations of new grabs, accurate real life kinematic data of grabs is required. Moreover kinematic data can potentially provide insight in current use of grabs, which can be interesting information...master thesis 2022
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Koop, L. (author)Because the seafloor is a complex ecosystem, a multidisciplinary approach must be adopted in order to produce comprehensive habitat maps. Such multidisciplinary projects have been lacking for the Dutch area of the North Sea. To address this lack, the Distribution, structure and functioning of low resilience seafloor communities and habitats of...doctoral thesis 2022
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Korthals Altes, W.K. (author)The concentration of farmland has potentially a negative impact on planning for local rural development as it impedes access to land for other rural initiatives. Land policies in the European Union aiming to reserve lands for local communities are constrained by principles of the EU single market, such as the free movement of capital and the...journal article 2022
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Ji, Yiran (author), Zheng, Feifei (author), Du, Jiawen (author), Huang, Yuan (author), Bi, Weiwei (author), Duan, Huan Feng (author), Savic, Dragan (author), Kapelan, Z. (author)Most of the contamination source localization methods for water distribution systems (WDSs) assume the availability of accurate water quality models and multi-parameter online sensors, which are often out of reach of many water utilities. To address this, a novel manual grab-sampling method (MGSM) is developed to effectively and efficiently...journal article 2022
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Cipriani, L. (author)Today, the landscapes of Asia—and Southeast Asia in particular—are undergoing major transformations, many of which are due to urbanisation processes that impact coastal areas. These are often controversial reclamation projects, generically referred to as the ‘war of sand’—an (in)visible conflict named for the raw material used to develop...journal article 2022
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- van Kol, Tessa (author) master thesis 2021
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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), 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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Koop, L. (author), Snellen, M. (author), Simons, D.G. (author)In this paper, object-based image analysis classification methods are developed that do not rely on backscatter in order to classify the seafloor. Instead, these methods make use of bathymetry, bathymetric derivatives, and grab samples for classification. The classification is performed on image object statistics. One of the methods utilizes...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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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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de Vries, Niels (author)Bulk materials such as iron ore transported by bulk carriers are commonly unloaded by the use of grabs. The unloading process is time consuming and increasing the unloading capacity is of big importance for terminals. A validated co-simulation developed by the TU Delft in cooperation with Nemag enables to test grabs in the virtual environment....master thesis 2020
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van den Bergh, Arjan (author)Grabs are often used for unloading bulk carriers that transport iron ore cargoes around the globe. The unloading process is time-consuming, and terminals strive to maximise their turnover capacity. Grab performance is a combination of maximum crane capacity, grab design and bulk material behaviour. Due to bulk uncertainties occurred by varying...master thesis 2019
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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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Karaca, Kadir (author)Bulk handling grabs wear due to interaction with bulk material. In this research the geometrical shape of the grab is adjusted to reduce this wear. A DEM simulation using an iron ore pellet material model, created by S. Lommen, is used to assess different concepts. The material model is validated for forces, but not for wear. Wear measurements...master thesis 2018
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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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Pulselli, R.M. (author), Maccanti, Matteo (author), Marrero, Madelyn (author), van den Dobbelsteen, A.A.J.F. (author), Martin, C.L. (author), Marchettini, Nadia (author)A method of greenhouse gas inventory has been developed for evaluating the environmental implications of civilian life, in terms of carbon emission, according to citizens' behaviour and to the condition of buildings, local infrastructures and services. The assessment focuses on energy use for housing, mobility, impacts of waste and water...journal article 2018
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Kunne, Michael (author)Engineers typically design heavy and powerful tools for the use of bulk transfer. High forces are needed to penetrate and to propagate into the bulk. Especially when using a grab, a reduction of mass is desirable. In the conventional approach an optimization problem is encountered as a further reduction in mass reduces the grabs ability to...master thesis 2017
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