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Flipse, Delano (author)The placement of a subwoofer has significant impact on the quality of its sound reproduction. This paper present a method to optimise subwoofer placement in a room. Resonances caused by room boundaries (called "room modes") cause localised peaks and lows for specific lower frequencies. The goal is to minimize the simulated frequency response...bachelor thesis 2023
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Ahmadi Dastjerdi, A. (author), Astolfi, Alessandro (author), Saikumar, N. (author), Karbasizadeh, Nima (author), Valerio, Duarte (author), Hassan HosseinNia, S. (author)This article introduces a closed-loop frequency analysis tool for reset control systems. To begin with sufficient conditions for the existence of the steady-state response for a closed-loop system with a reset element and driven by periodic references are provided. It is then shown that, under specific conditions, such a steady-state response...journal article 2023
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Dirkx, Nic (author), Tiels, Koen (author), Oomen, T.A.E. (author)Frequency response function (FRF) estimation from measured data is an essential step in the design, control, and analysis of complex dynamical systems, including thermal and motion systems. Especially for systems that require long measurement time, missing samples in the data record, e.g., due to measurement interruptions, often occur. The...journal article 2023
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Garg, Chirag (author)In a high-precision system that performs measurements or tooling on a workpiece, alignment of the tool and workpiece is of prime importance. To prevent misalignment, which leads to a loss in accuracy and precision, unwanted vibrations in structures must be attenuated. Topology Optimization (TO) is evolving as a mature design tool that provides...master thesis 2022
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van Wageningen, Noortje (author)his thesis aims to investigate the change in frequency performance of the Nordic Power System in 2030 caused by the replacement of synchronous generation by NSG. To do this, the Nordic Power System is modeled in the simulation software DIgSILENT PowerFactory 2022 SP1 for modeling and simulation. For the Nordic Power system, periods of low demand...master thesis 2022
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Páramo-Balsa, Paula (author), Gonzalez-Longatt, Francisco (author), Acosta, Martha N. (author), Rueda, José L. (author), Palensky, P. (author), Sanchez, Francisco (author), Roldan-Fernandez, Juan Manuel (author), Burgos-Payán, Manuel (author)The computational burden and the time required to train a deep reinforcement learning (DRL) can be appreciable, especially for the particular case of a DRL control used for frequency control of multi-electrical energy storage (MEESS). This paper presents an assessment of four training configurations of the actor and critic network to determine...conference paper 2022
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Riquelme-Dominguez, Jose Miguel (author), Gonzalez-Longatt, Francisco (author), Melo, André Felipe Silva (author), Rueda, José L. (author), Palensky, P. (author)Future carbon-neutral power systems impose many challenges; one of them is an advanced simulation platform that allows replicating the complex systems' actual dynamic performance. DIgEnSys-Lab is working toward proposing solutions to the most critical challenges to carbon-neutral energy systems. This paper shows preliminary results of...conference paper 2022
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Argiolas, Luca (author)Currently, the main revenue streams for grid connected BESS stem from regulated energy markets, such as Day Ahead Market (DAM) and Primary Frequency Regulation (PFR). Furthermore, BESS have great potential in providing services to network operators, however a clear business case for such functionalities is still missing. Therefore, this research...master thesis 2021
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Marshall, Jack (author)In order to decarbonize the electricity grid, renewable energy sources must be utilised in con- junction with energy storage to provide ancillary services, which maintain electricity supply quality, reliability and restorability, whilst remaining aordable. Due to a lack of knowledge about the potential of stacking UK ancillary services and...master thesis 2021
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Giannakopoulos, George (author)Power systems nowadays are experiencing a significant energy transition characterized by the progressive increment of power electronic interfaced units. Voltage source converters are extensively utilized to interconnect renewable energy sources at various transmission levels, facilitate the asynchronous interconnection of system areas through...master thesis 2021
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Mier Escurra, C. (author), Mor, A. R. (author)Gas insulated substations (GIS) have increased in the electric power system in recent years and is expected to continue increasing in the following years. The GIS has remarkable advantages over air insulated substation in offshore windfarms where the installation space is limited. The outlying location of the GIS demands a robust monitoring...conference paper 2021
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Adiyabazar, Choidorj (author), Gonzalez-Longatt, F. (author), Acosta, Martha N. (author), Rueda, José L. (author), Bolor, Erkhemzaya (author)Mongolian power grid (MPG) is becoming more eco-friendly as the power system is continuously integrating renewable energy, which reached 20% of the total installed capacity of Mongolia in 2020. The daily operation and the safety of the MPG have become very challenging because of increased levels of energy in the system. Therefore, the dynamic...conference paper 2021
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Shen, C. (author), Dollevoet, R.P.B.J. (author), Li, Z. (author)We propose to combine a physics-based finite element (FE) track model and a data-driven Gaussian process regression (GPR) model to directly infer railpad and ballast stiffness from measured frequency response functions (FRF) by field hammer tests. Conventionally, only the rail resonance and full track resonance are used as the FRF features to...journal article 2021
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Zhang, Chenrui (author), Rakhshani, E. (author), Veerakumar, Nidarshan (author), Rueda, José L. (author), Palensky, P. (author)The frequency stability of the power system is challenged by the high penetration of power electronic interfaced renewable energy sources (RES). This paper investigates the improvements of the frequency response of fully decoupled wind power generators (FDWG) by proposing a novel generic model implementation of ultracapacitors (UC) within a...journal article 2021
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Fu, W. (author), van Paassen, M.M. (author), Mulder, Max (author)Limitations of a haptic device can cause distortions of the force feedback it presents. Just-noticeable difference (JND) in system dynamics is important for creating transparent haptic interaction. Based on the previous work, this article presents a unified model that extends the existing JND rule. Our approach projects the JNDs in the...journal article 2020
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Zhang, Chenrui (author)The frequency stability of the power system is challenged by the high penetration of power electronic interfaced renewable energy sources (RES). This paper investigates the improvements of frequency responses of fully decoupled wind power generators (FDWG) by proposing a novel implementing of ultracapacitors (UC) within a hybrid scheme in real...master thesis 2020
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Baciu, Theodor (author)So far thermoset based composites have been used in primary aircraft structures, owing to their good performance and vast research on the subject. Recently thermoplastic based composites also gained an increased attention and there is a push towards adopting these for primary aircraft structures as well. This interest for thermoplastic...master thesis 2020
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Imhoff, A.W.M. (author)Conventional imaging techniques from medical ultrasound and seismic imaging are not suitable for multilayered domains where there is no separation between received reflection events. This happens in layered structures where the thickness of the individual layer is small with respect to the induced wavelengths. An example of these structures is...master thesis 2020
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Oureilidis, Konstantinos (author), Malamaki, Kyriaki-Nefeli (author), Gkavanoudis, Spyros (author), Cvetkovic, M. (author), Mauricio, Juan Manuel (author), Maza Ortega, Jose Maria (author), Martinez Ramos, Jose Luis (author), Papaioannou, George (author), Demoulias, Charis (author)The high proliferation of converter-dominated Distributed Renewable Energy Sources (DRESs) at the distribution grid level has gradually replaced the conventional synchronous generators (SGs) of the transmission system, resulting in emerging stability and security challenges. The inherent characteristics of the SGs are currently used for...review 2020
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Delissen, A.A.T.M. (author), van Keulen, A. (author), Langelaar, M. (author)In many engineering applications, the dynamic frequency response of systems is of high importance. In this paper, we focus on limiting the extreme values in frequency response functions, which occur at the eigenfrequencies of the system, better known as resonant peaks. Within an optimization, merely sampling the frequency range and limiting the...journal article 2020