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LED Degradation Monitoring Using a Multi-Channel Spectral Sensor

Myland, Paul (author), Herzog, Alexander (author), Babilon, Sebastian (author), van Driel, W.D. (author), Khanh, Tran Quoc (author)

This study explores a novel approach to monitor the spectral emission of LEDs by estimating the spectral power distribution from the spectral sensor responses during an accelerated aging experiment. Two methods for reconstructing the actual LED spectra from sensor responses are presented and tested, one solely requires sensor datasheet...

journal article 2024

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Benchmarking of hardware-efficient real-time neural decoding in brain-computer interfaces

Hueber, Paul (author), Tang, Guangzhi (author), Sifalakis, Manolis (author), Liaw, Hua Peng (author), Micheli, A. (author), Tömen, N. (author), Liu, Y. (author)

Designing processors for implantable closed-loop neuromodulation systems presents a formidable challenge owing to the constrained operational environment, which requires low latency and high energy efficacy. Previous benchmarks have provided limited insights into power consumption and latency. However, this study introduces algorithmic...

journal article 2024

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Frequency-domain modelling of reset control systems using an impulsive description

Buitenhuis, R. N. (author), Saikumar, N. (author), Hassan HosseinNia, S. (author)

The ever-increasing industry desire for improved performance makes linear controller design run into fundamental limitations. Nonlinear control methods such as Reset Control (RC) are needed to overcome these. RC is a promising candidate since, unlike other nonlinear methods, it easily integrates into the industry-preferred PID design...

journal article 2023

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Closed-loop Aspects of Data-Enabled Predictive Control

Dinkla, R.T.O. (author), Mulders, S.P. (author), van Wingerden, J.W. (author), Oomen, T.A.E. (author)

In recent years, the amount of data available from systems has drastically increased, motivating the use of direct data-driven control techniques that avoid the need of parametric modeling. The aim of this paper is to analyze closed-loop aspects of these approaches in the presence of noise. To analyze this, a unified formulation of several...

journal article 2023

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A closed-loop maintenance strategy for offshore wind farms: Incorporating dynamic wind farm states and uncertainty-awareness in decision-making

Li, M. (author), Jiang, X. (author), Carroll, James (author), Negenborn, R.R. (author)

The determination of maintenance strategies is subject to complexity and uncertainty arising from variable offshore wind farm states and inaccuracies in model parameters. The most common method in the existing studies is to adopt an open-loop approach to optimize a maintenance strategy. However, this approach lacks the ability to capture...

journal article 2023

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Spatial Resolution Matching of Microwave Radiometer Measurements Using Iterative Deconvolution with Close Loop Priors (ICLP)

Yao, Zhiyu (author), Hu, Weidong (author), Feng, Zhiyan (author), Zhang, Wenlong (author), Liu, Yang (author), Xu, Zhihao (author), Ligthart, L.P. (author)

Passive multifrequency microwave sensors frequently struggle with difficulties of nonuniform spatial resolution among multiple channels. The raw measurements in the land-sea transition zone are seriously contaminated. Conventional analytical deconvolution techniques suffer from the tradeoff between spatial resolution enhancement and noise...

journal article 2023

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Integrated topology and controller optimization using the Nyquist curve

Delissen, A.A.T.M. (author), van Keulen, A. (author), Langelaar, Matthijs (author)

The design of high-performance mechatronic systems is very challenging, as it requires delicate balancing of system dynamics, the controller, and their closed-loop interaction. Topology optimization provides an automated way to obtain systems with superior performance, although extension to simultaneous optimization of both topology and...

journal article 2023

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Opto-electronic feedback control of membrane potential for real-time control of action potentials

Ördög, Balázs (author), De Coster, Tim (author), Dekker, Sven O. (author), Bart, Cindy I. (author), Zhang, Juan (author), Boink, Gerard J.J. (author), Bax, Wilhelmina H. (author), Deng, Shanliang (author), den Ouden, B.L. (author), de Vries, Antoine A.F. (author), Pijnappels, Daniël A. (author)

To unlock new research possibilities by acquiring control of action potential (AP) morphologies in excitable cells, we developed an opto-electronic feedback loop-based system integrating cellular electrophysiology, real-time computing, and optogenetic approaches and applied it to monolayers of heart muscle cells. This allowed accurate...

journal article 2023

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Closing the loop: Novel quantitative fMRI approach for manipulation of the sensorimotor loop in tremor

Sharifi, S. (author), Luft, F. (author), de Boer, L. (author), Buijink, A. W.G. (author), Mugge, W. (author), Schouten, A.C. (author), Heida, T. (author), Bour, L. J. (author), van Rootselaar, A. F. (author)

Tremor is thought to be an effect of oscillatory activity within the sensorimotor network. To date, the underlying pathological brain networks are not fully understood. Disentangling tremor activity from voluntary motor output and sensorimotor feedback systems is challenging. To better understand the intrinsic sensorimotor fingerprint...

journal article 2022

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An Adaptive Disturbance Decoupling Perspective to Longitudinal Platooning

Liu, Di (author), Besselink, Bart (author), Baldi, S. (author), Yu, Wenwu (author), Trentelman, Harry L. (author)

Despite the progress in the field of longitudinal formations of automated vehicles, only recently an interpretation of longitudinal platooning has been given in the framework of disturbance decoupling, i.e. the problem of making a controlled output independent of a disturbance. The appealing feature of this interpretation is that the...

journal article 2022

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Closing the loop in model-based wind farm control

Doekemeijer, B.M. (author)

Open-loop wake steering inconsistently improves the energy yield of wind farms in field experiments in the literature. This thesis matures wind farm control technologies for power maximization in a model-based closed-loop framework towards real-world practical applicability. Firstly, open-loop wake steering is evaluated on a commercial onshore...

doctoral thesis 2020

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Closed-loop model-based wind farm control using FLORIS under time-varying inflow conditions

Doekemeijer, B.M. (author), van der Hoek, D.C. (author), van Wingerden, J.W. (author)

Wind farm (WF) controllers adjust the control settings of individual turbines to enhance the total performance of a wind farm. Most WF controllers proposed in the literature assume a time-invariant inflow, whereas important quantities such as the wind direction and speed continuously change over time in reality. Furthermore, properties of the...

journal article 2020

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Observability of the ambient conditions in model-based estimation for wind farm control: A focus on static models

Doekemeijer, B.M. (author), van Wingerden, J.W. (author)

Wind farm control (WFC) algorithms rely on an estimate of the ambient wind speed, wind direction, and turbulence intensity in the determination of the optimal control setpoints. However, the measurements available in a commercial wind farm do not always carry sufficient information to estimate these atmospheric quantities. In this paper, a...

journal article 2020

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Incorporating design for remanufacturing in the early design stage: a design management perspective

Boorsma, Nina (author), Balkenende, R. (author), Bakker, C.A. (author), Tsui, T.P.Y. (author), Peck, David (author)

Adopting design approaches that allow products to last multiple use-cycles supports European Commission objectives to reduce greenhouse gas emissions and reduce primary material impacts. Remanufacturing is an example of an appropriate circular strategy and it can be applied in a variety of industries that are intensive materials users....

journal article 2020

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Towards closed-loop dynamical wind farm control: model development and control applications

Boersma, S. (author)

Electricity consumption is increasing on a global level. In 2017, non-renewable energy sources such as crude oil, natural gas and coal provided 76% of the required energy, while 24% came from renewable sources such as hydro, wind and solar. Non-renewable sources are finite because they do not replenish rapidly enough relative to the rate at...

doctoral thesis 2019

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A constrained wind farm controller providing secondary frequency regulation: An LES study

Boersma, S. (author), Doekemeijer, B.M. (author), Siniscalchi-Minna, S. (author), van Wingerden, J.W. (author)

Active power control for wind farms is needed to provide ancillary services. One of these services is to track a power reference signal with a wind farm by dynamically de- and uprating the turbines. In this paper we present a closed-loop wind farm controller that evaluates 1) thrust coefficients on a seconds-scale that provide power tracking...

journal article 2019

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Automated real-time railway traffic control: an experimental analysis of reliability, resilience and robustness

Corman, Francesco (author), Quaglietta, E. (author), Goverde, R.M.P. (author)

Railway transportation provides sustainable, fast and safe transport. Its attractiveness is linked to a broad concept of service reliability: the capability to adhere to a timetable in the presence of delays perturbing traffic. To counter these phenomena, real-time rescheduling can be used, changing train orders and times, according to rules of...

journal article 2018

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Value of information in closed-loop reservoir management

Goncalves Dias De Barros, E. (author)

Over the past decades, many technological advances have unlocked new opportunities to boost efficiency in the oil and gas industry (e.g., complex well drilling, injection of advanced chemicals, sophisticated instrumentation). The real engineering challenge is to apply these technologies in the best possible way for each particular case. This...

doctoral thesis 2018

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Circular Economy in the building sector: Three cases and a collaboration tool

Leising, E.J. (author), Quist, J.N. (author), Bocken, N.M.P. (author)

The Circular Economy (CE) gained significant traction in business and academia. While in the building sector issues around energy efficiency are being widely explored, CE is still a relatively new topic. This article reports on three CE pilots in the Dutch building sector and develops a collaboration tool for developing and operating circular...

journal article 2018

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Tensor networks for MIMO LPV system identification

Gunes, Bilal (author), van Wingerden, J.W. (author), Verhaegen, M.H.G. (author)

In this paper, we present a novel multiple input multiple output (MIMO) linear parameter varying (LPV) state-space refinement system identification algorithm that uses tensor networks. Its novelty mainly lies in representing the LPV sub-Markov parameters, data and state-revealing matrix condensely and in exact manner using specific tensor...

journal article 2018