A5060388157- Wind Energy Research and Development
- Wind and Air Flow Studies
- Fluid Dynamics and Vibration Analysis
- Wave and Wind Energy Systems
- Wind Turbine Control Systems
- Energy Load and Power Forecasting
- Engineering Applied Research
- Cavitation Phenomena in Pumps
- Fluid Dynamics and Turbulent Flows
- Solar Radiation and Photovoltaics
- Structural Health Monitoring Techniques
- Real-time simulation and control systems
- Computational Physics and Python Applications
- Bacterial Identification and Susceptibility Testing
- Biomimetic flight and propulsion mechanisms
- Induction Heating and Inverter Technology
- Herpesvirus Infections and Treatments
- Topology Optimization in Engineering
- Flow Measurement and Analysis
- Advanced Multi-Objective Optimization Algorithms
- Advanced Aircraft Design and Technologies
- Vibration and Dynamic Analysis
- Bacteriophages and microbial interactions
- Soft Robotics and Applications
- Cerebral Venous Sinus Thrombosis
Technical University of Denmark
2006-2024
Danish Energy Association
2022
Czech Academy of Sciences, Institute of Hydrodynamics
2021
Response Biomedical (Canada)
2021
Wind Power Engineering (Japan)
2018-2019
Abstract. It is important to optimize wind turbine positions mitigate potential wake losses. To perform this optimization, atmospheric conditions, such as the inflow speed and direction, are assigned probability distributions according measured data, which propagated through engineering models estimate annual energy production (AEP). This study presents stochastic gradient descent (SGD) for farm an approach that estimates of AEP using Monte Carlo simulation, allowing consideration...
Abstract. Wind farm layout optimization is usually subjected to boundary constraints of irregular shapes. The analytical expressions these shapes are rarely available, and consequently, it can be challenging include them in the mathematical formulation problem. This paper presents a new methodology integrate multiple disconnected domain boundaries wind problems. method relies on gradients distances between turbine locations boundaries, which represented by polygons. parameterized...
Abstract. As the use of wind energy expands worldwide, industry is considering building larger clusters turbines. Existing computational methods to design and optimize layout farms are well suited for medium-sized plants; however, these approaches need be improved ensure efficient scaling large farms. This work investigates strategies covering this gap, focusing on gradient-based (GB) approaches. We investigated main bottlenecks problem, including time per iteration, multi-start GB...
Abstract. Wind farm layout optimization is usually subjected to boundary constraints of irregular shapes. The analytical expressions these shapes are rarely available, and, consequently, it can be challenging include them in the mathematical formulation problem. This paper presents a new methodology integrate multiple disconnected and domain boundaries wind problems. method relies on gradients distances between turbine locations boundaries, which represented by polygons. parameterized...
Abstract This study presents Hipersim , an efficient, open-source, Python-based turbulence box generation tool. combines Mann generation, application of constraints, and non-Gaussian features that have not been available previously in a single package. The output the tool is compatible with popular aeroelastic simulation formats (Hawc2 TurbSim). also has significantly better computational efficiency than earlier tools, as well possibility for parallelization. source code publicly accessible,...
Abstract Thanks to the development of several wake models, recent years have seen a huge static wind farm simulators. As new farms are planned for deep waters, there is need extend these tools account floater rotation and displacement. In this work, we addressed task by selecting reduced set environmental conditions generating database from medium-fidelity simulations, whose computational cost has been developing solver. Then, trained neural networks embedded them in PyWake via...
Abstract. The objective of this paper is to investigate the joint optimization wind farm layout and control in terms power production. A successful fulfilment goal requires following: (1) an accurate fast flow model, (2) selection minimum set design parameters that rules or governs problem, (3) algorithm with good scaling properties. For individual turbines aim production optimization, two most obvious strategies are wake steering based on active turbine yaw derating. present investigation...
Abstract Lillgrund offshore wind farm near Copenhagen has been the subject of a number research projects. The close turbine spacing makes it an interesting candidate for into wakes and control. As part EU TotalControl project, axial induction controller designed field testing at Lillgrund. was using steady-state optimisations in DNV’s LongSim code, which predicted small but significant power gain along with considerable reduction fatigue loading. Some simplifications were introduced ease...
Abstract This paper presents a general purpose platform for optimal open loop control of wind power plants as seen from production perspective. The idea is to change the controller design criteria greedy individual turbines facilitating cooperative and interdependent elements plant, with overall aim improve plant conditioned on ambient mean speed direction. flow within including all essential interactions between turbines, modelled using very fast linearized CFD RANS solver. are actuator...
This paper presents a comparison between measured and simulated tower loads for the Danish offshore wind farm Nysted 2. Previously, only limited full scale experimental data containing load measurements have been published, in many cases include range of speeds. In general, wake conditions are very challenging to predict correctly simulations. The project offers an improved insight this field as six turbines located II instrumented measure top bottom moments. All recorded structural...
Abstract. As the use of wind energy expands worldwide, industry is considering building larger clusters turbines. Existing computational methods to design and optimize layout farms are well suited for medium-sized plants; however, these approaches need be improved ensure efficient scaling large farms. This work investigates strategies covering this gap, focusing on Gradient-Based (GB) approaches. We investigated main bottlenecks problem, including time per iteration, multi-start GB...
This paper describes a new method to estimate the undisturbed inflow field of wind turbine based on measurements obtained from one or more five-hole pitot tubes mounted directly blades. Based measurements, disturbance caused by is estimated using aerodymanic models that compensate for axial and tangential induction, approximated blade element momentum theory, radial expansion inflow, rotor tilt, dynamic skew tip loss, as well braking circulation flow local airfoil. The speeds measured...
Abstract. In this paper an alternative method to evaluate power performance and loads on wind turbines using a blade-mounted flow sensor is investigated. The hypothesis that the speed measured at blades has high correlation with such or load assessment can be performed from few hours days of measurements.In present study five-hole pitot tube used as conventional approach, where reference either nearby met mast nacelle lidar technology cup anemometers. From measurements, accurate estimate...
Abstract. It is important to optimize wind turbine positions mitigate potential wake losses. To perform this optimization, atmospheric conditions, such as the inflow speed and direction, are assigned probability distributions according measured data, these conditions propagated through engineering models estimate annual energy production (AEP). This study presents stochastic gradient descent (SGD) for farm which an approach that estimates of AEP using Monte Carlo simulation, allowing...
Abstract. Design of an optimal wind farm topology and control scheduling depends on the chosen metric. The objective this paper is to investigate influence layout in terms power production. A successful fulfilment goal requires: 1) accurate fast flow model; 2) selection minimum set design parameters that rules problem; 3) optimization algorithm with good scaling properties. For individual turbines, two most obvious strategies are wake steering based active turbine yaw derating. present...
To assess recent trends in susceptibility to antibiotics among urinary isolates isolated European emergency departments (EDs) and identify with a high (90% or more) predicted probability of fluoroquinolones third-generation cephalosporins (3GCs).In this cross-sectional study, we included urine cultures obtained from adult patients between 2010 2016 24 EDs. Temporal were assessed using time-series analysis multivariate logistic models. Multivariate models also used predict 3GCs patient age...
Abstract. In this paper, inflow information is extracted from a measurement database and used for aeroelastic simulations to investigate if using more accurate descriptions improves the accuracy of simulated fatigue loads. The nearby met masts blade-mounted five-hole pitot tube. provide measurements at fixed positions some distance away, whereas tube measures while rotating with rotor. mast free-inflow velocity, but measured turbulence may evolve on its way turbine, pass besides or be in...
Abstract We present a full-scale validation study of an optimal power open-loop wind farm control schedule (WFCS) using full row turbines (Row-A) at the Lillgrund offshore as demonstration case. The derived WFCS is conditioned on ambient speed and direction. WFCS’s are developed DNV DTU numerical models LongSim Fuga. Prior to implementation, controllers tested by comparing results, based Fuga optimized input, with results vice versa. These very different in their nature — being linearized...
Abstract. In this paper, inflow information is extracted from a measurement database and used for aeroelastic simulations to investigate if using more accurate descriptions improves the accuracy of simulated wind-turbine fatigue loads. The nearby meteorological masts (met masts) blade-mounted five-hole pitot tube. met provide measurements at fixed positions some distance away turbine, whereas tube measures while rotating with rotor. mast free-inflow velocity; however measured turbulence may...
Arabinosyladenine, an established antiherpetic drug, was used to block herpes simplex virus type 1 DNA synthesis quantitatively in infected xeroderma pigmentosum cells. Kinetic analyses of viral polypeptides synthesized the presence and absence this drug revealed that there were at least six distinct kinetic classes polypeptides. These differed time appearance after infection, maximum rate synthesis, kinetics turnoff, sensitivity arabinosyladenine. This study showed arabinosyladenine had...
Abstract In this study, we demonstrate how to carry out the design optimization of floating offshore wind farms by considering impacts brought movements turbines. A steady state movement and flow model is applied in modelling process. This developed building a turbine surrogate for estimating power production turbines incorporating it an open-source static farm simulator, PyWake. Using methodology, layout problems are solved using algorithms like Random Search maximize energy yield while...