Searched for: author:"Schmehl, R."
(1 - 20 of 54)

Pages

document
Borobia-Moreno, R. (author), Ramiro-Rebollo, D. (author), Sanchez-Arriaga, G. (author), Schmehl, R. (author)
conference paper 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
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
Sánchez-Arriaga, Gonzalo (author), Pastor-Rodríguez, Alejandro (author), Sanjurjo-Rivo, Manuel (author), Schmehl, R. (author)
A parallelized flight simulator for the dynamic analysis of airborne wind energy (AWE) systems for ground- and fly-generation configurations is presented. The mechanical system comprises a kite or fixed-wing drone equipped with rotors and linked to the ground by a flexible tether. The time-dependent control vector of the simulator mimics real...
journal article 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
document
van der Vlugt, R. (author), Bley, A.C. (author), Noom, Michael (author), Schmehl, R. (author)
The traction force of a kite can be used to drive a cyclic motion for extracting wind energy from the atmosphere. This paper presents a novel quasi-steady modelling framework for predicting the power generated over a full pumping cycle. The cycle is divided into traction, retraction and transition phases, each described by an individual set...
journal article 2019
document
Hummel, Jan (author), Göhlich, Dietmar (author), Schmehl, R. (author)
We have developed a tow test setup for the reproducible measurement of the dynamic properties of different types of tethered membrane wings. The test procedure is based on repeatable automated maneuvers with the entire kite system under realistic conditions. By measuring line forces and line angles, we determine the aerodynamic coefficients and...
journal article 2019
document
Folkersma, M.A.M. (author), Schmehl, R. (author), Viré, A.C. (author)
We present a computational fluid dynamic analysis of boundary layer transition on leading edge inflatable kite airfoils used for airborne wind energy generation. Because of the operation in pumping cycles, the airfoil is generally subject to a wide range of Reynolds numbers. The analysis is based on the combination of the shear stress transport...
journal article 2019
document
Rapp, S. (author), Schmehl, R. (author), Oland, Espen (author), Schmidt, Sture (author), Haas, Thomas (author), Meyers, Johan (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 an automatic control system is required that allows autonomously operating the system...
conference paper 2019
document
Bauer, Florian (author), Petzold, Daniel (author), Kennel, Ralph M. (author), Campagnolo, Filippo (author), Schmehl, R. (author)
A control scheme for drag power kites, also known as airborne wind turbines, for the entire wind speed range is proposed, including 1) a temperature controller allowing for temporary overloading of the powertrain; 2) a limitation controller ensuring that power, force, speed, and actuator constraints are satisfied; 3) a tangential flight speed...
journal article 2019
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
Oehler, J.D. (author), Schmehl, R. (author)
Wind tunnel testing of large deformable soft kites for wind energy conversion is expensive and in many cases practically not feasible. Computational simulation of the coupled fluid–structure interaction problem is scientifically challenging and of limited practical use for aerodynamic characterization. In this paper we present a novel...
journal article 2019
document
Sanchez Arriaga, G. (author), Pastor-Rodriguez, A. (author), Borobia-Moreno, R. (author), Schmehl, R. (author)
The LAgrangian Kite SimulAtor (LAKSA) is a freely available software for the dynamic analysis of tethered flying vehicles, such as kites and fixed-wing drones, applied to airborne wind energy generation. This software comprises four simulators. The one, two and four-line simulators, which consider flexible but inelastic tethers, are based on...
journal article 2018
document
Oehler, J.D. (author), van Reijen, M.R. (author), Schmehl, R. (author)
Airborne wind energy is an evolving renewable energy technology with the potential to reduce material as well as energy investments and to harvest wind resources that have so far not been accessible. Ground generation systems use the pulling force of a kite to generate a linear traction motion driving a drum connected to a generator. To...
journal article 2018
document
Fechner, U. (author), Schmehl, R. (author)
To achieve a high conversion efficiency and at the same time robust control of a pumping kite power system it is crucial to optimize the three-dimensional flight path of the tethered wing. This chapter extends a dynamic system model to account for a realistic, turbulent wind environment and adds a flight path planner using a sequence of...
book chapter 2018
document
Salma, V. (author), Ruiterkamp, Richard (author), Kruijff, Michiel (author), van Paassen, M.M. (author), Schmehl, R. (author)
Safety is a major factor in the permitting process for airborne wind energy systems. To successfully commercialize the technologies, safety and reliability have to be ensured by the design methodology and have to meet accepted standards. Current prototypes operate with special temporary permits, usually issued by local aviation authorities...
book chapter 2018
document
Rapp, S. (author), Schmehl, R. (author)
In this work, a novel vertical takeoff and landing methodology for flexible wing kite power systems is presented. Starting from a basic mast-based launching and landing concept, the operational envelope will be enlarged using the external assistance of a multicopter. The multicopter is used to drag the kite along a specified launching path until...
journal article 2018
document
Faggiani, P. (author), Schmehl, R. (author)
The development of airborne wind energy is steadily progressing towards the market introduction of the technology. Even though the physical foundations of the various conversion concepts are well understood, the actual economic potential of distributed small-scale and centralized large-scale power generation under realworld conditions is...
book chapter 2018
document
Wijnja, Jelle (author), Schmehl, R. (author), De Breuker, R. (author), Jensen, Kenneth (author), Vander Lind, Damon (author)
This paper presents an extension of the simulation code ASWING to aeroelastic analysis of an airborne wind turbine. The device considered in this study consists of a tethered rigid wing with onboard-mounted wind turbines designed for wind energy harvesting in crosswind flight operation. The electrically conducting tether is deployed from a...
journal article 2018
document
Benhaïem, Pierre (author), Schmehl, R. (author)
The study proposes a new airborne wind energy system based on the carousel concept. It comprises a rotary ring kite and a ground-based rotating reel conversion system. The moment generated by the ring kite is transferred by several peripheral tethers that connect to winch modules that are mounted on the ground rotor. A generator is coupled to...
book chapter 2018
Searched for: author:"Schmehl, R."
(1 - 20 of 54)

Pages