Wake Impact Alleviation Control Based on Wake Identification

Ehlers, Jana; Fischenberg, D.; Niedermeier, Dominik

doi:10.2514/1.c033157

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…LIDAR sensors have so far been used for characterization of aircraft wake vortices [18] and identification of aircraft wakes to alleviate wake impact [19]. However, published LIDAR measurements of wind turbine wakes are still rare and the data is highly dependent on local atmospheric conditions.…”

mentioning

confidence: 99%

Wind-Turbine Wake Encounter by Light Aircraft

Wang

White

Barakos

2017

Journal of Aircraft

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mentioning

confidence: 99%

Wind-Turbine Wake Encounter by Light Aircraft

Wang

White

Barakos

2017

Journal of Aircraft

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“…After a few transformations, the regularized optimization problem, with two Tikhonov terms, reads θ arg min Another application based on onboard lidar measurements is the identification of wake vortices [107,112,113] shortly before encountering them with the aim of mitigating their impact [114][115][116]. As pointed out in Ref.…”

Section: Wind Field Reconstruction From Airborne Lidar Measurementsmentioning

confidence: 99%

Retrospective and Recent Examples of Aircraft and Rotorcraft System Identification at DLR

Deiler

Mönnich

Seher-Weiß

et al. 2023

Journal of Aircraft

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Aircraft system identification has a five-decades-long tradition at German Aerospace Center (DLR). Over the last two decades, the research covered various topics related to system identification of fixed- and rotary-wing aircraft, nonconventional applications and atmospheric effects, the development of new flight-test procedures for system identification purposes, and specific aircraft model enhancements and corresponding parameter estimation. Comprehensive tools were developed that support this research and can be applied to a variety of different problems and types of vehicles. The paper starts with a short description of the different system identification methods used at DLR and the corresponding tools. The discussion of flight-test procedures and maneuver design as well as sensor fusion and flight-path reconstruction provides information on how to optimize the flight tests for system identification and to arrive at a consistent flight-test database. The examples for fixed-wing aircraft provide information on identification including abnormal conditions such as icing and interaction with atmospheric disturbances as well as modeling of structural mechanics and loads. The identification of high-order rotorcraft models that account for rotor and engine dynamics and even structural modes is discussed, and the identification of rotor mast moments as well as the identification of non-physics-based models and their integration into physics-based models are also covered. A final section shows that system identification can also be used to derive models for gyroplanes and parachutes as well as to derive control equivalent turbulence input models and to estimate complex wind field geometries. Thus, a broad overview of possible applications of system identification is given.

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“…The results suggest that relative wind velocities can be measured with a standard deviation of below 2 m/s even at high altitudes with no appreciable aerosol concentrations. Such measurements in the near-field ahead of the aircraft can be used as input to wake impact alleviation control systems that may alleviate the aircraft's response during the wake encounter by counteracting control-surface deflections [69].…”

Section: Airborne Sensorsmentioning

confidence: 99%

A review of recent wake vortex research for increasing airport capacity

Hallock

Holzäpfel

2018

Progress in Aerospace Sciences

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This paper is a brief review of recent wake vortex research as it affects the operational problem of spacing aircraft to increase airport capacity and throughput. The paper addresses the questions of what do we know about wake vortices and what don't we know about wake vortices. The introduction of Heavy jets in the late 1960s stimulated the study of wake vortices for safety reasons and the use of pulsed lidars and the maturity of computational fluid dynamics in the last three decades have led to extensive data collection and analyses which are now resulting in the development and implementation of systems to safely decrease separations in the terminal environment. Although much has been learned about wake vortices and their behavior, there is still more to be learned about the phenomena of aircraft wake vortices.

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Wake Impact Alleviation Control Based on Wake Identification

Cited by 9 publications

References 18 publications

Wind-Turbine Wake Encounter by Light Aircraft

Wind-Turbine Wake Encounter by Light Aircraft

Retrospective and Recent Examples of Aircraft and Rotorcraft System Identification at DLR

A review of recent wake vortex research for increasing airport capacity

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