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Delft University of Technology

1. Brantjes, M.L.J. To improve the use of automation systems on trailing suction hopper dredgers:.

Degree: 2011, Delft University of Technology

IHC-Systems develops automation systems for dredgers. They assume the automation systems on board of trailing suction hopper dredgers are not always employed. Trailer suction hopper dredgers are a specific type of dredgers. Several automation systems can assist the operators for dredging. Some ships have dedicated operators and on other ships operation is done by the 1st mate, in combination with the navigation. The research question is: (1) Why are the automation systems on trailer suction hopper dredgers not always used. And (2) in what way this can be improved. The research consists of observations and of interviews with crew members on several trailing suction hopper dredgers, and with company staff. Also similar studies on the use of automation systems, found in literature, are consulted for the analysis. The factors that can influence the use of automation are sorted and their interrelations visualised. The main factors then are nominated. The major factor is addressed as the design goal for the concept generation. The assumption that the automation systems are not always used, is firstly confirmed. The identified reasons why operators do not use the automation systems, are: Lack of confidence, boredom, situation of dredging, annoyance, complexity of the system and the experience that the utilization does not form part of the routine. These reasons are the result of several influencing factors, that belong to one of three domains: a, the automation system, or b, the user, or c, the context. Such factors are: a lack of knowledge or awareness, bad experiences, risks, workload, type of project, signals from the system, implementation on the ships, and training. To improve the use of the automation systems, a design goal is formulated. Central in the concept is to increase the awareness of the operator on the automation systems. Knowledge is enhanced by adapting the signals from the workstation. This will give the operators a better awareness of the process and the process risks. The other part in the concept is to give the operators more control on the system and a safer feeling. This is achieved by giving more information about the automation system and providing this information structured intuitively. The feeling of control and safety will increase the operators trust in the automation system. He will be more confident to use the automation system and the use will become part of his routine. First solutions for separate aspects of the problem are generated. Integration, with a morphological map, of these ideas result in total solutions. The solutions are developed into several concepts. These are compared with the Harris profile method. And the selected design is combined with the best elements from the rejected concepts. The resulting improved concept is applied to one of the automation systems; the visor automation. The application is developed in cooperation with users. In an early stage the opinion of the operators on the concept realisation are solicited. The study revealed the kind of information… Advisors/Committee Members: Kim, C.J., Molenbroek, J.F.M..

Subjects/Keywords: interface design; trust; dredgers; use

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Brantjes, M. L. J. (2011). To improve the use of automation systems on trailing suction hopper dredgers:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d226cd35-6431-46f8-b5c6-d74d88a37da8

Chicago Manual of Style (16th Edition):

Brantjes, M L J. “To improve the use of automation systems on trailing suction hopper dredgers:.” 2011. Masters Thesis, Delft University of Technology. Accessed October 16, 2019. http://resolver.tudelft.nl/uuid:d226cd35-6431-46f8-b5c6-d74d88a37da8.

MLA Handbook (7th Edition):

Brantjes, M L J. “To improve the use of automation systems on trailing suction hopper dredgers:.” 2011. Web. 16 Oct 2019.

Vancouver:

Brantjes MLJ. To improve the use of automation systems on trailing suction hopper dredgers:. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2019 Oct 16]. Available from: http://resolver.tudelft.nl/uuid:d226cd35-6431-46f8-b5c6-d74d88a37da8.

Council of Science Editors:

Brantjes MLJ. To improve the use of automation systems on trailing suction hopper dredgers:. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:d226cd35-6431-46f8-b5c6-d74d88a37da8


Delft University of Technology

2. Kerssemakers, K.A. Overflow sampling of trailing suction hopper dredgers:.

Degree: 2004, Delft University of Technology

Turbidity is recognised as one of the major environmental problems of dredging. To get a handle on this problem the Dutch dredging industry (VBKO) commissioned a research project to develop software capable of predicting how much sediment is released into suspension during dredging operations. Major field measurement exercises are carried out in order to provide calibration data for the software. One exercise has been carried out using a trailing suction hopper dredger (Cornelia) working in the port of Rotterdam in June 2002. During dredging by a trailing suction hopper dredger one or two suction pipes are lowered on the seabed. A mixture of sediment and water is sucked up and passes into the hopper of the dredger. When the hopper is loaded beyond capacity, excess mixture leaves the hopper by means of the overflow and is released back into the water. This overflow of sediment is the main contribution to the sediment plumes near the dredging vessel. The main objective of this thesis is to find out whether the flow rate and the solids concentrations leaving the dredging vessel can be calculated sufficiently from the measured overflow samples. Special techniques were developed to sample the hopper overflow. Three novel flowthrough samplers are constructed to sample the overflow mixture. These have been used, in combination with a bottle sampler to obtain about 500 samples taken at four different locations in the overflow during 14 trips. All samples have been analysed on particle size distribution and dry matter content, some samples also on particle specific gravity. Soil samples taken in the dredging area provide the data needed for mapping the soil conditions coming up by the suction pipes. It appears that at some locations quite homogeneous soil conditions are present. Nevertheless also significant variations in the Particle Size Distributions have been found. During all dredging operations, the vessel's TDS (Tonnes Dry Solids) system has logged the characteristics like draughts and the concentrations plus velocities of the upcoming mixture in the suction pipes. These data have been reviewed to assess their reliability. After recalibration of the datasets, the concentration leaving the vessel by the overflow is computed by using sediment balances. The computed sediment releases have been compared with the measured overflow releases in order the attempt to validate the sampling method. It appeared that validation of the samples by this comparison was not possible. Advisors/Committee Members: Dankers, P.J.T., Otten, C.J., Van Gelder, P.H.A.J.M., Stive, M.J.F., Van Rhee, C..

Subjects/Keywords: trailing suction hopper dredgers; overflow

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kerssemakers, K. A. (2004). Overflow sampling of trailing suction hopper dredgers:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:510246d0-1858-4ccf-b4a3-fe334f741259

Chicago Manual of Style (16th Edition):

Kerssemakers, K A. “Overflow sampling of trailing suction hopper dredgers:.” 2004. Masters Thesis, Delft University of Technology. Accessed October 16, 2019. http://resolver.tudelft.nl/uuid:510246d0-1858-4ccf-b4a3-fe334f741259.

MLA Handbook (7th Edition):

Kerssemakers, K A. “Overflow sampling of trailing suction hopper dredgers:.” 2004. Web. 16 Oct 2019.

Vancouver:

Kerssemakers KA. Overflow sampling of trailing suction hopper dredgers:. [Internet] [Masters thesis]. Delft University of Technology; 2004. [cited 2019 Oct 16]. Available from: http://resolver.tudelft.nl/uuid:510246d0-1858-4ccf-b4a3-fe334f741259.

Council of Science Editors:

Kerssemakers KA. Overflow sampling of trailing suction hopper dredgers:. [Masters Thesis]. Delft University of Technology; 2004. Available from: http://resolver.tudelft.nl/uuid:510246d0-1858-4ccf-b4a3-fe334f741259

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