Design and Wind Tunnel Test Validation of Gust Load Alleviation Systems

Ricci, Sergio; Gaspari, Alessandro De; Fonte, Federico; Riccobene, Luca; Toffol, Francesco; Mantegazza, Paolo; Karpel, Moti; Roizner, Federico; Wiberman, R.; Weiß, Martin; Cooper, Jonathan; Howcroft, Chris; Calderon, Dario; Adden, Stephan

doi:10.2514/6.2017-1818

Cited by 22 publications

(20 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…26. The HALE aircraft is part of NASA’s Environmental Research Aircraft and Sensor Technology program aiming at developing UAVs capable of long-duration and very high-altitude flights for atmospheric research (174) . Although it is not difficult to imagine that the results, based on a scientific approach, verified that the larger gust duration and amplitude produce larger wing root bending curvature as plotted in Figs.…”

Section: Gust Load Influencementioning

confidence: 99%

“…Results indicated that the three control laws reduced the maximal bending moment by 9.4, 13.3, and 15.1%, respectively, in contrast to the BMA open-loop case. The EU funded project GLAMOUR tackles the development, implementation and experimental verification of GLA technologies applied to a Green Regional Aircraft (174,197,198) . Wind-tunnel experiments have been performed to validate the strategies using motors, ailerons and elevator actuators in Refs 198 and 199.…”

Section: Wind-tunnel Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Gust loads on aircraft

Cao

Ismail

2019

Aeronaut. j.

View full text Add to dashboard Cite

An important prerequisite for the design, assessment and certification of aircraft and their associated control systems is a quantitative specification of the environment in which the aircraft is intended to operate, for example, atmospheric gust. Gust loads on aircraft may induce detrimental influences such as increased aerodynamic and structural loads, structural deformation and decreased flight dynamic performance. This paper presents a systematic and comprehensive overview of important concepts and applications of gust loads on aircraft. This overview includes a brief research background, concepts, research techniques, influences and load alleviation measures of gust. Finally, we summarise some potential improvements in the future work. It is also recommended to learn from previous experiences to avoid aviation accidents due to flight through atmospheric gusts and turbulence.

show abstract

Section: Gust Load Influencementioning

confidence: 99%

Section: Wind-tunnel Experimentsmentioning

confidence: 99%

Gust loads on aircraft

Cao

Ismail

2019

Aeronaut. j.

View full text Add to dashboard Cite

show abstract

“…The sampling duration was 60 s with a sampling frequency of 2000 Hz for each measurement run. The sampling duration was considered long enough compared to the 5 s extreme events to check for any unexpected perturbation in the flow field due to running the experiments in closed-loop mode as the flow recirculates, by considering the flow recirculation path (∼ 25 + 4 + 25 + 4 = 58 m) and the average wind speed (∼ 5 m/s) which give a recirculation time of 12 s. The precise turbulence characteristics are not the major objective of the current study so the sampling frequency was chosen based on previous studies in this facility (Refan and Hangan, 2018;Romanic et al, 2019). In each extreme event multiple actuation times for modulating either the fan powers or the IGVs were considered; this study presents the best results compared to the target extreme events from an individual test run.…”

Section: Experimental Setup For Velocity Measurementsmentioning

confidence: 99%

Experimental and numerical simulation of extreme operational conditions for horizontal axis wind turbines based on the IEC standard

2020

View full text Add to dashboard Cite

Abstract. In this study, the possibility of simulating some transient and deterministic extreme operational conditions for horizontal axis wind turbines based on the IEC 61400-1 standard using 60 individually controlled fans in the Wind Engineering, Energy and Environment (WindEEE) Dome at Western University was investigated. Experiments were carried out for the extreme operational gust (EOG), positive and negative extreme vertical shear (EVS), and extreme horizontal shear (EHS) cases, tailored for a scaled 2.2 m horizontal axis wind turbine. For this purpose, firstly a numerical model for the test chamber was developed and used to obtain the fans' configurations for simulating each extreme condition with appropriate scaling prior to the physical experiments. The results show the capability of using numerical modelling to predict the fans' setup based on which physical simulations can generate IEC extreme conditions in the range of interest.

show abstract

“…Ricci et al summarized the GLAMOUR project, which was a project that worked on GLA techniques for advanced regional aircraft. The wind tunnel model design and control strategy were presented as well [17].…”

Section: Introductionmentioning

confidence: 99%

Gust Load Alleviation including Geometric Nonlinearities Based on Dynamic Linearization of Structural ROM

Yang

Xie

et al. 2019

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

This paper describes a framework for an active control technique applied to gust load alleviation (GLA) of a flexible wing, including geometric nonlinearities. Nonlinear structure reduced order model (ROM) and nonplanar double-lattice method (DLM) are used for structural and aerodynamic modeling. The structural modeling method presented herein describes stiffness nonlinearities in polynomial formulation. Nonlinear stiffness can be derived by stepwise regression. Inertia terms are constant with linear approximation. Boundary conditions and kernel functions in the nonplanar DLM are determined by structural deformation to reflect a nonlinear effect. However, the governing equation is still linear. A state-space equation is established in a dynamic linearized system around the prescribed static equilibrium state after nonlinear static aeroelastic analysis. Gust response analysis can be conducted subsequently. For GLA analysis, a classic proportional-integral-derivative (PID) controller treats a servo as an actuator and acceleration as the feedback signal. Moreover, a wind tunnel test has been completed and the effectiveness of the control technology is validated. A remote-controlled (RC) model servo is chosen in the wind tunnel test. Numerical simulation results of gust response analysis reach agreement with test results. Furthermore, the control system gives GLA efficacy of vertical acceleration and root bending moment with the reduction rate being over 20%. The method described in this paper is suitable for gust response analysis and control strategy design for large flexible wings.

show abstract

Design and Wind Tunnel Test Validation of Gust Load Alleviation Systems

Cited by 22 publications

References 3 publications

Gust loads on aircraft

Gust loads on aircraft

Experimental and numerical simulation of extreme operational conditions for horizontal axis wind turbines based on the IEC standard

Gust Load Alleviation including Geometric Nonlinearities Based on Dynamic Linearization of Structural ROM

Contact Info

Product

Resources

About