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- Van De Poel, I.R. (author) journal article 2007
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Verhaegen, M.H.G. (author), Hansson, A (author)The identification of multivariable state space models in innovation form is solved in a subspace identification framework using convex nuclear norm optimization. The convex optimization approach allows to include constraints on the unknown matrices in the data-equation characterizing subspace identification methods, such as the lower triangular...journal article 2016
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Gillebaart, E. (author), De Breuker, R. (author)Low-fidelity isogeometric aeroelastic analysis has not received much attention since the introduction of the isogeometric analysis (IGA) concept, while the combination of IGA and the boundary element method in the form of the potential flow theory shows great potential. This paper presents a two-dimensional low-fidelity aeroelastic analysis and...journal article 2016
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Mosaffa, A. H. (author), Farshi, L. Garousi (author), Infante Ferreira, C.A. (author), Rosen, M. A. (author)Exergoeconomic and environmental analyses are presented for two CO<sub>2</sub>/NH<sub>3</sub> cascade refrigeration systems equipped with (1) two flash tanks and (2) a flash tank along with a flash intercooler with indirect subcooler. A comparative study is performed for the proposed systems, and optimal values of operating parameters of the...journal article 2016
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Najafi, E. (author), Babuska, R. (author), Delgado Lopes, G.A. (author)Most stabilizing controllers designed for nonlinear systems are valid only within a specific region of the state space, called the domain of attraction (DoA). Computation of the DoA is usually costly and time-consuming. This paper proposes a computationally effective sampling approach to estimate the DoAs of nonlinear systems in real time....journal article 2016
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Verbert, K.A.J. (author), De Schutter, B.H.K. (author), Babuska, R. (author)Last-minute maintenance planning is often undesirable, as it may cause downtime during operational hours, may require rescheduling of other activities, and does not allow to optimize the management of spare parts, material, and personnel. In spite of the aforementioned drawbacks of last-minute planning, most existing methods plan maintenance...journal article 2017
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Wang, M. (author), Infante Ferreira, C.A. (author)Ionic liquids (ILs), as novel absorbents, draw considerable attention for their potential roles in replacing water or LiBr aqueous solutions in conventional NH<sub>3</sub>/H<sub>2</sub>O or H<sub>2</sub>O/LiBr absorption refrigeration or heat pump cycles. In this paper, performances of 9 currently investigated NH<sub>3</sub>/ILs pairs are...journal article 2017
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Wang, Q. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Spanwise twist can dominate the deformation of flapping wings and alters the aerodynamic performance and power efficiency of flapping wings by changing the local angle of attack. Traditional Fluid–Structure Interaction (FSI) models, based on Computational Structural Dynamics (CSD) and Computational Fluid Dynamics (CFD), have been used to...journal article 2017
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van der Kruk, E. (author), Veeger, H.E.J. (author), van der Helm, F.C.T. (author), Schwab, A.L. (author)Advice about the optimal coordination pattern for an individual speed skater, could be addressed by simulation and optimization of a biomechanical speed skating model. But before getting to this optimization approach one needs a model that can reasonably match observed behaviour. Therefore, the objective of this study is to present a verified...journal article 2017
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Correa-Posada, Carlos M. (author), Morales-Espana, G. (author), Dueñas, Pablo (author), Sánchez-Martín, Pedro (author)The growing increase of renewable generation worldwide is posing new challenges for a secure, reliable and economic operation of power systems. In order to face the uncertain and intermittent production of renewable sources, operating reserves must be allocated efficiently and accurately. Nowadays, these reserves are mainly assigned to thermal...journal article 2017
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Hjortnaes, T. (author), Wiegmans, B. (author), Negenborn, R.R. (author), Zuidwijk, R.A. (author), Klijnhout, R. (author)Shipping companies are striving to optimize their empty container repositioning strategies which also contribute to reduced congestion and environmental improvements. In this paper we propose a multi-commodity model that makes an explicit distinction between flows of non-damaged containers, on the one hand, and flows of damaged containers, on...journal article 2017
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de Witte, D. (author), de Klijn-Chevalerias, M.L. (author), Loonen, R.C.G.M. (author), Hensen, J.L.M. (author), Knaack, U. (author), Zimmermann, G. (author)This paper reports on the research-driven design process of an innovative thermal mass concept: Convective Concrete. The goal is to improve building energy efficiency and comfort levels by addressing some of the shortcomings of conventional building slabs with high thermal storage capacity. Such heavyweight constructions tend to have a slow...journal article 2017
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Benndorf, J. (author), Jansen, J.D. (author)Advanced data acquisition and process modelling technology provide ‘real-time’ data and decision support capacity for different aspects of the resource extraction process. Closed-loop approaches have recently been applied to utilize information extracted from these data in combination with advanced computing technology for improved production...journal article 2017
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Ghaemi, N. (author), Cats, O. (author), Goverde, R.M.P. (author)This paper investigates the challenges of railway traffic controllers in dealing with big disruptions and the kind of support tools that could help to improve their task in terms of performance, lead time and workload. The disruption handling process can be partitioned into three phases resembling a bathtub. For each phase the essential...journal article 2017
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Alibekov, Eduard (author), Kubalik, Jiri (author), Babuska, R. (author)This paper addresses the problem of deriving a policy from the value function in the context of critic-only reinforcement learning (RL) in continuous state and action spaces. With continuous-valued states, RL algorithms have to rely on a numerical approximator to represent the value function. Numerical approximation due to its nature virtually...journal article 2018
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Han, Y. (author), Hegyi, A. (author), Yuan, Y. (author), Roncoli, Claudio (author), Hoogendoorn, S.P. (author)This paper extends an existing linear quadratic model predictive control (LQMPC) approach to multi-destination traffic networks, where the correct origin-destination (OD) relations are preserved. In the literature, the LQMPC approach has been presented for efficient routing and intersection signal control. The optimization problem in the...journal article 2018
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Swaminathan, Siva (author), Wang, X. (author), Zhou, Bingyu (author), Baldi, S. (author)Heating, ventilation and air-conditioning (HVAC) units in buildings form a system-of-subsystems entity that must be accurately integrated and controlled by the building automation system to ensure the occupants' comfort with reduced energy consumption. As control of HVACs involves a standardized hierarchy of high-level set-point control and...journal article 2018
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Khan, A.S.M. (author), Verzijlbergh, R.A. (author), Sakinci, Ozgur Can (author), De Vries, Laurens (author)To ensure security of supply and incentivize reliable investment in generation capacity, capacity markets (CMs) have been implemented or are being considered. However, demand response (DR) and electrical energy storage (EES) also contribute to system adequacy. In this paper, we analyse the change in the need for a CM if DR and EES are...journal article 2018
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Yin, F. (author), Gangoli Rao, A. (author), Bhat, Abhishek (author), Chen, Min (author)This paper presents the performance assessment of a novel turbofan engine using two energy sources: Liquid Natural Gas (LNG) and kerosene, called Multi-Fuel Hybrid Engine (MFHE). The MFHE is a new engine concept consisting of several novel features, such as a contra-rotating fan to sustain distortion caused by boundary layer ingestion, a...journal article 2018
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Raso, L. (author), Barbier, Bruno (author), Bader, Jean Claude (author)Dams can produce electricity and ensure water security, but at the same time they radically alter the hydrological regime of rivers with significant consequences for the economic and environmental welfare of the region in which they are located. Cost-benefit analysis (CBA) is currently the most frequently used framework for the economic...journal article 2018