Effect of an active high-lift system failure during landing approaches

Diekmann, Jobst Henning; Hahn, Klaus-Uwe

doi:10.1007/s13272-014-0139-7

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…including slight correctional terms for jet momentum and thrust. Further details of the underlying longitudinal aerodynamic model can be found in [16,17].…”

Section: Longitudinal Motionmentioning

confidence: 99%

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Flight Mechanical Challenges of STOL Aircraft Using Active High Lift

Diekmann¹

2019

Journal of Aircraft

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This paper focuses on the flight mechanical characteristics of an active high-lift supported transport type aircraft. The presented configuration combines a boundary-layer controlled flaps system with the benefits of propeller slipstream deflection. The underlying aerodynamic models and assumptions are provided. The extraordinary flight performances especially at low airspeed will be pointed out, as well as potential weaknesses. Special attention is paid to the unusually strong aerodynamic couplings in the lateral motion. Therefore, flight dynamics characteristics will be presented and their challenges discussed. The key influences are pointed out and an outlook will be given, how to exploit this knowledge for safe and satisfactory aircraft operation and handling.

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“…including slight correctional terms for jet momentum and thrust. Further details of the underlying longitudinal aerodynamic model can be found in [16,17].…”

Section: Longitudinal Motionmentioning

confidence: 99%

“…Pitching moment due to sideslipThis model is integrated into the full aircraft flight dynamics model as an increment to the basic full motion aerodynamic model. The complete simulation model also incorporates various additional dynamics for example for the engine dynamics or the actuator dynamics of the control surfaces[17].…”

mentioning

confidence: 99%

Flight Mechanical Challenges of STOL Aircraft Using Active High Lift

Diekmann¹

2019

Journal of Aircraft

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“…The models for lift and pitching moment separate the aerodynamics of the horizontal tailplane from the wing/fuselage (WF), recombined by a downwash model to describe the specific characteristics of the flaps system. A detailed description of the full aircraft model, its development stages, and the current model structure can be found in [16][17][18]. For the following investigations, the aircraft is assumed to be configured for the final approach phase with full flap deflection.…”

Section: Modeling Approachmentioning

confidence: 99%

Controllability of an aircraft with active high-lift system using a segmentwise controllable flap system

et al. 2018

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Active high-lift aircraft needs exceptional aerodynamic control performance to operate at low airspeed. In this study, a new concept for the improvement of controllability is investigated, incorporating the special capabilities of a blown Coandȃ flap system. The blowing system along the flaps is divided into 12 independently controllable segments. This provides the opportunity to influence the lift distribution along the wingspan by individual blowing performance settings for each segment without changing the flap deflection. This offers the chance to control the airplane in the final approach phase with fully deflected flaps using only the blowing system and to dedicate specific control tasks to particular segments. A model for the blowing system influence on the local wing aerodynamics is implemented in an existing nonlinear full aircraft flight mechanics model. The system capabilities in terms of roll control and the climb performance are investigated by criteria' evaluation and dynamic simulation assessment. The ability to fly turn/altitude change maneuvers by utilizing the active high-lift system is proven and a corresponding control concept is presented. It also includes the compensation of different blowing failure cases, which leads to acceptable but still improvable aircraft reactions.

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“…In order to introduce the basic functionality of this highlift system, the blown flap technology used in the SFB 880 and its influence on the aerodynamics of a wing are explained in this section. Figure 2 shows a sketch of the wing profile and how the blowing system can be implemented, based on results of research activities in the SFB 880 [13][14][15][16]. The special shape of the knee of…”

Section: Active High-lift Aircraft Configurationmentioning

confidence: 99%

Flight mechanics model for spanwise lift and rolling moment distributions of a segmented active high-lift wing

Diekmann¹,

Keller²,

Faez

et al. 2017

CEAS Aeronaut J

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In this study the aerodynamics of wings using an active high-lift system are investigated. The target is the flight mechanical description of the spanwise forces and resulting moments and the influence of the active high-lift system to their distribution. The high-lift system is a blown flap system divided into six segments per wing. Each segment is assumed to be individually controlled, so the system shall be used for aircraft control and system failure management. This work presents a flight mechanical model for the simulation of flight dynamics, which has been derived from high-fidelity CFD results. An assessment of single segment blowing system failures will be presented including recommendations for compensation of either lift or rolling moment loss. For this investigation, the compensation is required to act at the same wing on which the failure appears.shall be proven. The results show that less performance investment in terms of pressurized air is necessary to compensate the rolling moment of a failing segment instead of its lift. However, large performance increases for the remaining wing segments occur for some of the failure cases.

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Effect of an active high-lift system failure during landing approaches

Cited by 6 publications

References 7 publications

Flight Mechanical Challenges of STOL Aircraft Using Active High Lift

Flight Mechanical Challenges of STOL Aircraft Using Active High Lift

Controllability of an aircraft with active high-lift system using a segmentwise controllable flap system

Flight mechanics model for spanwise lift and rolling moment distributions of a segmented active high-lift wing

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