Stabilization of the vertical take-off of a rigid flying wing for an airborne wind energy system

Fuest, H.; Duda, D.; Islam, Tobias; Ostermann, Tobias; Moormann, Dieter

doi:10.1007/s13272-021-00545-3

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…To analyze the flight dynamics of the longitudinal motion, we consider the trim states for a stationary flight from thrust-borne to wing-borne flight only through a pitch motion, in analogy to [6].…”

Section: Trim States Of the Longitudinal Pitch Motionmentioning

confidence: 99%

“…The wing is separated into elements with similar aerodynamic characteristics. The presence of elevons modify the aerodynamic coefficients, while the slipstream of the propellers have influence on the airflow of the wing, see also [6,12]. For each element, the 2D polar of the airfoil is used to calculate under consideration of inflow, propeller slipstream and elevon deflection the forces and moments acting on the center of gravity.…”

Section: Aerodynamic Modelmentioning

confidence: 99%

“…The propeller are aligned with the wing so that the downstream enables the elevons to induce a sufficient roll moment even during hover. However, as the lever arm of the elevons in longitudinal direction is low, the vertical pitch attitude is longitudinally unstable and the trim range is limited in hover, as described in detail in [6]. A high horizontal inflow under high angles of attack perpendicular to the wing area induce strong pitching moments that need to be avoided.…”

Section: Introductionmentioning

confidence: 99%

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Flight Path and Flight Dynamic Analysis of the Starting Procedure of a Flying Wing for an Airborne Wind Energy System

Fuest,

Duda,

Islam

et al. 2024

Preprint

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Airborne Wind Energy is an emerging technology that harvests wind energy with flight systems connected via a tether to a generator at the ground. A flying wing promises a high energy output during the power generation phase due to its aerodynamic efficiency, while being able to take-off as a tailsitter. Yet not part of the generation phase, the starting procedure raises main challenges to the flight system in general but especially to a flying wing. A fast transition from hover to crosswind flight is striven under minimal power consumption and high wind robustness, while considering the limited trim range of the flying wing in hover state. This paper conducts a detailed analysis of the stationary trim states of the flying wing from thrust-borne to wing-borne flight and introduces a lateral yaw-roll transition to keep the angle of attack in controllable limits at all times. Based on the trim states, different options for the starting procedure are evaluated and an appropriate path is selected that entails a straight-lined transition segment to enter forward flight, followed by curved flight to built up tether tension and to navigate into the power-generation zone. The first part of this transition from hover to horizontal forward flight is demonstrated in the simulation to verify the selected flight path.

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Section: Trim States Of the Longitudinal Pitch Motionmentioning

confidence: 99%

Section: Aerodynamic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flight Path and Flight Dynamic Analysis of the Starting Procedure of a Flying Wing for an Airborne Wind Energy System

Fuest,

Duda,

Islam

et al. 2024

Preprint

View full text Add to dashboard Cite

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Hybrid modeling approach for the tether of an airborne wind energy system

et al. 2022

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The design of controllers for the automatic operation of airborne vehicles is challenging. Especially in the emerging research field of airborne wind energy, where tethered aircraft convert energy from wind at higher altitudes into electricity, the development of robust and safe control systems will be a critical success factor. Typically, these systems consist of one or more controlled aircraft, a ground station, and one or more tethers that transfer aerodynamic forces acting on the wings to the ground. To understand these systems and control them for real-time simulations, suitable tether models must extend the classical flight mechanical models. In this paper, a hybrid approach is presented, combining an elastic spring model with a catenary model of the tether. In particular, for real-time simulations in a model-in-the-loop environment where a static modeling approach is sufficient, this hybrid model is intended to provide an alternative to the commonly used spring models. Furthermore, such a static tether model neglects high-frequency dynamic oscillations that can occur with dynamic lumped mass models. As consequence, the focus is on primary influences such as stiffness and sag due to external loads. The developed hybrid model is analyzed and compared with the spring model for a simulated tethered flight. It can be concluded that this hybrid static model, although subject to strong assumptions such as symmetrical tether sag, represents the tether more accurately. For example, it allows a more precise design of the flight controller before conducting any flight tests. This model can be used as a reasonable alternative to the simple spring model whenever a static modeling approach of the tether is adequate.

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Stabilization of the vertical take-off of a rigid flying wing for an airborne wind energy system

Cited by 4 publications

References 5 publications

Flight Path and Flight Dynamic Analysis of the Starting Procedure of a Flying Wing for an Airborne Wind Energy System

Flight Path and Flight Dynamic Analysis of the Starting Procedure of a Flying Wing for an Airborne Wind Energy System

Hybrid modeling approach for the tether of an airborne wind energy system

Assisted site-dependent selection of the most suitable Airborne Wind Energy system via Fuzzy Analytic Network Process

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