Nonlinear Reduced‐order Aeroservoelastic Analysis of Very Flexible Aircraft

Tantaroudas, N.D.; Ronch, Andrea Da

doi:10.1002/9781118928691.ch4

Cited by 9 publications

(9 citation statements)

References 24 publications

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“…Models used for the prediction of the aircraft response need to accommodate those events that are perceived as discrete and usually described as gusts, as well as the phenomena described as continuous turbulence [4].…”

Section: Atmospheric Turbulence and Gust Modelsmentioning

confidence: 99%

“…More details may be found in Ref. [4]. One of most serious forms of turbulence in flight is clear air turbulence (CAT).…”

Section: Introductionmentioning

confidence: 99%

“…The control for GLA emerged vigorously in 1964 due to a significant incident. During a routine mission, a B52-H bomber encountered severe turbulence with an estimated peak velocity of 35 m/s [4]. Nearly 80% of the ventral fin broke off in flight, resulting in an extensive investigation and several development programs on GLA.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Feedforward Control for Gust-Induced Aeroelastic Vibrations

2018

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This paper demonstrates the implementation of an adaptive feedforward controller to reduce structural vibrations on a wing typical section. The aeroelastic model includes a structural nonlinearity, which is modelled in a polynomial form. Aeroelastic vibrations are induced by several gusts and atmospheric turbulence, including the discrete “one-minus-cosine” and a notably good approximation in the time-domain to the von Kármán spectrum. The control strategy based on the adaptive feedforward controller has several advantages compared to the standard feedback controller. The controller gains, which are updated in real-time during the gust encounter, are found solving a minimization problem using the finite impulse responses as basis functions. To make progress with the application in aeroelasticity, a single-input single-output controller is designed measuring the wing torsional deformation. For both deterministic and random atmospheric shapes, the controller was found successful in alleviating the aeroelastic vibrations. The impact of the control action on the unmeasured structural modes was found minimal.

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Section: Atmospheric Turbulence and Gust Modelsmentioning

confidence: 99%

“…More details may be found in Ref. [4]. One of most serious forms of turbulence in flight is clear air turbulence (CAT).…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Feedforward Control for Gust-Induced Aeroelastic Vibrations

2018

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“…Although researchers have successfully integrated higher-order CFD solvers into computational aeroelastic models (Refs. 12,13), it is still considered to be a challenge because of the high computational cost [14], particularly for unsteady simulations. Because of this, there are only a handful of dynamic aeroelastic analyses done using higher-order CFD solvers, and most of those are done using simple geometries.…”

Section: Introductionmentioning

confidence: 99%

Active Flutter Suppression Controllers Derived from Linear and Nonlinear Aerodynamics: Application to a Transport Aircraft Model

Waite

Stanford

Bartels

et al. 2018

2018 Applied Aerodynamics Conference

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Active flutter suppression has been demonstrated in simulation by many researchers, generally using methods based on linear aerodynamics and often with simplistic geometries. In this paper, active flutter suppression is demonstrated in a simulation using a Navier-Stokes aerodynamics code, FUN3D, and a realistic transport aircraft configuration. This is accomplished using simple observer-feedback controllers derived from linear aeroelastic models, including reduced order models built via FUN3D data. The development of these reduced order models is described here. It is shown that controllers derived from reduced order models of the nonlinear aerodynamics outperform controllers based on linear aerodynamics.

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“…Considering Eq. (2), it can be observed that the lift coefficient is composed of three contributions [42]. The first contribution, which includes three acceleration terms, represents the non-circulatory part of the lift coefficient.…”

Section: Strip Aerodynamicsmentioning

confidence: 99%

Energy harvesting by means of flow-induced vibrations on aerospace vehicles

Ronch

et al. 2016

Progress in Aerospace Sciences

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140

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This paper reviews the design, implementation, and demonstration of energy harvesting devices that exploit flow-induced vibrations as the main source of energy.Starting with a presentation of various concepts of energy harvesters that are designed to benefit from a general class of flow-induced vibrations, specific attention is then given at those technologies that may offer, today or in the near future, a potential benefit to extend the operational capabilities and to monitor critical parameters of

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Nonlinear Reduced‐order Aeroservoelastic Analysis of Very Flexible Aircraft

Cited by 9 publications

References 24 publications

Adaptive Feedforward Control for Gust-Induced Aeroelastic Vibrations

Adaptive Feedforward Control for Gust-Induced Aeroelastic Vibrations

Active Flutter Suppression Controllers Derived from Linear and Nonlinear Aerodynamics: Application to a Transport Aircraft Model

Energy harvesting by means of flow-induced vibrations on aerospace vehicles

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