Page 51


Simon Ster 42.4 | april 2011

quently, the timed model is refined to a hybrid- χ model of the physical behavior. The controllers of this hybrid model can serve as a basis for real-time control of the station behavior when the hardware components are physically available. Both χ models are validated in order to check if these models represent the intended behavior. This is done by simulating the behavior of the model. However, unless exhaustive, simulation can only show that the system might has correct behavior and cannot guarantee correctness of the model, since it is usually not possible to analyze all behaviors using simulation. In other words, some problems can be discovered and solved during simulation, but simulation does not prove the correctness of a model. Therefore, the model has to be verified. Subsequently, the χ models are manually transformed to CIF models to be able to translate the models to other tools developed in the Multiform project. After analysis of the χ and CIF models, the controllers modeled in CIF serve as a basis for real-time control of the station behavior. No real components of the pipeless plant exist so far. All components are represented by models that substitute the realizations. The resulting early representation of the plant is tested to detect and solve problems at an early stage of the design process. As soon as a component is realized, the model of that component has to be substituted by its realization and tested.

Process Technology Hi, my name is Rudy Helmons and I am a student of Mechanical Engineering, within the master track of Thermo Fluids Engineering, at Process Engineering to be more specific. My graduation project is commissioned by MTI Holland (Mineral Technological Institute), a business unit of IHC Merwede that focuses on the research and development for dredging, dredge mining and dredging equipment. My first contact with IHC Merwede was during an excursion of W.S.V. Simon Stevin at the site of Kinderdijk. During the tour on the shipyard, I became more and more interested in the shipbuilding and dredging process. I knew that it was possible to do the graduation project in industry, which I had discussed with my graduation professor, Brouwers. With his approval I submitted an application letter and my resume to IHC for a graduation project. After an interview, IHC offered me this chance; the research for my master’s thesis would be on vertical hydraulic transport of solid particles.

The Model-Based Systems Engineering approach

In my final project, I have applied the MBSE development process to the pipeless plant. However, the current design process can be further optimized. For example, the design process is optimized, when models are automatically translated from χ to CIF. Irma Bouwman

First an overview of the bigger picture of the research. During the last decades, the worldwide demand for raw materials has increased enormously. To meet this growing demand, mining companies have to search constantly for new locations. Many of these new locations have been found at the bottom of the sea, at water depths of 2.000 meters. The ore deposits found there, so-called ‘Seafloor Massive Sulphide’ (SMS) deposits and manganese nodules, contain relatively high concentrations of

Simon Ster 42.4  

De vierde Simon Ster van haar tweeënveertigste jaargang