Searched for: author:"Schmehl, R."
(1 - 20 of 72)

Pages

document
Rushdi, Mostafa A. (author), Dief, Tarek N. (author), Yoshida, Shigeo (author), Schmehl, R. (author)
Kites can be used to harvest wind energy with substantially lower material and environmental footprints and a higher capacity factor than conventional wind turbines. In this paper, we present measurement data from seven individual tow tests with the kite system developed by Kyushu University. This system was designed for 7 kW traction power...
journal article 2020
document
Schelbergen, M. (author), Kalverla, Peter C. (author), Schmehl, R. (author), Watson, S.J. (author)
Airborne wind energy (AWE) systems harness energy at heights beyond the reach of tower-based wind turbines. To estimate the annual energy production (AEP), measured or modelled wind speed statistics close to the ground are commonly extrapolated to higher altitudes, introducing substantial uncertainties. This study proposes a clustering procedure...
journal article 2020
document
Krishnan, Navaneetha (author), Viré, A.C. (author), Schmehl, R. (author), van Bussel, G.J.W. (author)
A novel immersed boundary method based on a domain decomposition approach is proposed in the context of a finite element discretisation method. It is applicable to incompressible flows past rigid, deforming, or moving bodies. In this method, unlike most immersed boundary methods, strong boundary conditions are imposed in the regions of the...
journal article 2020
document
Candade, A.A. (author), Ranneberg, Maximilian (author), Schmehl, R. (author)
In this paper, we present an aero-structural model of a tethered swept wing for airborne wind energy generation. The carbon composite wing has neither fuselage nor actuated aerodynamic control surfaces and is controlled entirely from the ground using three separate tethers. The computational model is efficient enough to be used for weight...
journal article 2020
document
Rushdi, Mostafa A. (author), Rushdi, Ahmad A. (author), Dief, Tarek N. (author), Halawa, Amr M. (author), Yoshida, Shigeo (author), Schmehl, R. (author)
Kites can be used to harvest wind energy at higher altitudes while using only a fraction of the material required for conventional wind turbines. In this work, we present the kite system of Kyushu University and demonstrate how experimental data can be used to train machine learning regression models. The system is designed for 7 kW traction...
journal article 2020
document
Rushdi, Mostafa (author), Hussein, Ahmed A. (author), Dief, Tarek (author), Yoshida, Sheigeo (author), Schmehl, R. (author)
Airborne wind energy (AWE) is an innovative renewable energy technology, with the potential to substantially reduce the cost of energy. This paper introduces a solution for one of the main challenges of AWE systems, which is the automated reliable launching of the airborne system component. Our launch system configuration consists of a rigid...
conference paper 2020
document
Dief, Tarek N. (author), Fechner, Uwe (author), Schmehl, R. (author), Yoshida, Shigeo (author), Rushdi, Mostafa A. (author)
In this paper, we applied a system identification algorithm and an adaptive controller to a simple kite system model to simulate crosswind flight maneuvers for airborne wind energy harvesting. The purpose of the system identification algorithm was to handle uncertainties related to a fluctuating wind speed and shape deformations of the...
journal article 2020
document
Candade, A.A. (author), Ranneberg, Maximilian (author), Schmehl, R. (author)
In Candade et al,<sup>1</sup> the authors would like to correct the affiliations of Maximilian Ranneberg<sup>2</sup> and Roland Schmehl<sup>1</sup>.
journal article 2020
document
Folkersma, M.A.M. (author), Schmehl, R. (author), Viré, A.C. (author)
In this paper we present a computational approach to simulate the steady-state aeroelastic deformation of a ram-air kite for airborne wind energy applications. The approach is based on a computational fluid dynamics (CFD) solver that is two-way coupled with a finite element (FE) solver. All components of the framework, including the meshing...
journal article 2020
document
Eijkelhof, D. (author), Rapp, S. (author), Fasel, Urban (author), Gaunaa, Mac (author), Schmehl, R. (author)
In this paper, we present the design and computational model of a representative multi-megawatt airborne wind energy (AWE) system, together with a simulation framework that accounts for the flight dynamics of the fixed-wing aircraft and the sagging of the tether, combining this with flight control and optimisation strategies to derive the...
journal article 2020
document
Schelbergen, M. (author), Schmehl, R. (author)
The quasi-steady performance model (QSM) has been developed specifically for pumping airborne wind energy systems using flexible membrane wings. In this study, we validate this model using a comprehensive set of flight data that includes 87 consecutive pumping cycles and is acquired with the development platform of Kitepower B.V. The...
journal article 2020
document
Krishnan, Navaneetha (author), Viré, A.C. (author), Schmehl, R. (author), van Bussel, G.J.W. (author)
Airborne wind energy systems often use kites made of thin membranes to save material costs and increase mobility. However, this design choice increases the complexity of the aeroelastic behaviour of the system and demands high-fidelity tools. On the aerodynamic side of the multi-physics problem, it is quite challenging to create a high...
journal article 2020
document
Candade, A.A. (author), Ranneberg, Maximillian (author), Schmehl, R. (author)
In this work we explore the initial design space for composite kites, focusing on the configuration of the bridle line system and its effect on the aeroelastic behaviour of the wing. The computational model utilises a 2D cross sectional model in conjunction with a 1D beam model (2+1D structural model) that captures the complex composite...
journal article 2020
document
Salma, V. (author), Schmehl, R. (author)
Airborne wind energy (AWE) systems use tethered flying devices to harvest wind energy beyond the height range accessible to tower-based turbines. AWE systems can produce the electric energy with a lower cost by operating in high altitudes where the wind regime is more stable and stronger. For the commercialization of AWE, system reliability...
journal article 2020
document
Viré, A.C. (author), Demkowicz, P.A. (author), Folkersma, M.A.M. (author), Roullier, A.J.J. (author), Schmehl, R. (author)
In this work we present Reynolds-averaged Navier-Stokes (RANS) simulations of the flow past the constant design shape of a leading-edge inflatable (LEI) wing. The simulations are performed with a steady-state solver using a k-ω SST turbulence model, covering a range of Reynolds numbers between 10<sup>5</sup> ≤ and ≤ 15 × 10<sup>6</sup> and...
journal article 2020
document
Rapp, S. (author), Schmehl, R. (author), Oland, Espen (author), Haas, Thomas (author)
Airborne wind energy is an emerging technology that uses tethered unmanned aerial vehicles for harvesting wind energy at altitudes higher than conventional towered wind turbines. To make the technology competitive to other renewable energy technologies a reliable control system is required that allows autonomously operating the system throughout...
journal article 2019
document
Borobia-Moreno, R. (author), Ramiro-Rebollo, D. (author), Sanchez-Arriaga, G. (author), Schmehl, R. (author)
conference paper 2019
document
Bechtle, Philip (author), Schelbergen, M. (author), Schmehl, R. (author), Zillmann, Udo (author), Watson, S.J. (author)
We compare the available wind resources for conventional wind turbines and for airborne wind energy systems. Accessing higher altitudes and continuously adjusting the harvesting operation to the wind resource substantially increases the potential energy yield. The study is based on the ERA5 reanalysis data which covers a period of 7 years...
journal article 2019
document
Watson, S.J. (author), Moro, Alberto (author), Reis, Vera (author), Baniotopoulos, Charalampos (author), Barth, Stephan (author), Bartoli, Gianni (author), Bauer, Florian (author), Jamieson, Peter (author), Schmehl, R. (author)
This paper represents an expert view from Europe of future emerging technologies within the wind energy sector considering their potential, challenges, applications and technology readiness and how they might evolve in the coming years. These technologies were identified as originating primarily from the academic sector, some start-up...
review 2019
document
Thedens, P. (author), De Oliveira Andrade, G.L. (author), Schmehl, R. (author)
We present a multidisciplinary design optimization method for the profile and structural reinforcement layout of a ram‐air kite rib. The aim is to minimize the structural elastic energy and to maximize the traction power of a ram‐air kite used for airborne wind energy generation. Because of the large deformations occurring during flight, a fluid...
journal article 2019
Searched for: author:"Schmehl, R."
(1 - 20 of 72)

Pages