Shape optimization to improve the transonic fluid-structure interaction stability by an aerodynamic unsteady adjoint method

Chen, Wengang; Gao, Chuanqiang; Gong, Yiming; Zhang, Weiwei

doi:10.1016/j.ast.2020.105871

Cited by 20 publications

(4 citation statements)

References 45 publications

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“…The preceding statement may reverse depending on the flight control system design [4]; however, by ignoring such designs, degradation of the static stability can be interpreted according to the physical behavior of the aircraft as mentioned previously. In the mathematical form, the stick-free neutral point calculation is given as in (12), which is derived in [2].…”

Section: A Simulation Approach For Stick-free Neutral Point Detectionmentioning

confidence: 99%

“…Also, in these sources, the dynamic flight stability perspective has not been addressed; however, based on the outputs of these approaches proposed here, the stick-free assessments should not be restricted to just these evaluations but should be expanded for a broad understanding of the design stage. Besides these, there are plenty of studies that address the control surface buzz [11][12][13][14], free-play [15][16][17][18], or friction issues [18,19] in the aeroelasticity sense; however, there is no study about the problem which is of concern in this study, coupling of elevator rigid body dynamics with aircraft motions and its analysis in terms of dynamic flight stability. The existence of insufficiency in the design literature about this problem notwithstanding, it is a known phenomenon in the flight test literature [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Stick-free Flight Stability Problem Revisited: A Modeling and Simulation Approach

Altunkaya¹,

OZKOL²

2022

Preprint

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The stick-free flight stability is an old-fashioned and non-progressive issue; nevertheless, it is still existent, and of significant importance to the design of aircraft whose control system is reversible. The problem’s existence necessitates a deep assessment of stick-free flight stability throughout the aircraft design. Up to now, this problem has been addressed using either analytical approaches, which are only related to the static stability evaluation, or performing flight tests. In this study, the problem is handled in its entirety, from static and dynamic flight stability assessment to design criteria with a comprehensive perspective. Moreover, it is also exhibited that contrary to what has been generally proposed in the literature, limiting the problem of stick-free flight stability through static stability assessment is far from the main challenge. As a brief scope, the derivation of the control surface dynamics, a stick-free trim algorithm, and assessment rationale of the stick-free static and dynamic flight stability using a simulation approach are proposed. As a consequence, the aim is to set a broad understanding for designers related to this phenomenon and add adjunct design criteria in the design optimization process by approaching it in terms of modeling, simulation, and flight test perspective.

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Section: A Simulation Approach For Stick-free Neutral Point Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stick-free Flight Stability Problem Revisited: A Modeling and Simulation Approach

Altunkaya¹,

OZKOL²

2022

Preprint

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show abstract

“…Other studies have focused on wing morphing and shape optimization (Babinsky & Ogawa 2008; Wengang et al. 2020). These techniques aim at reducing shock strength by smearing the normal shock into a -shock thus delaying shock-induced separation and abating shock-induced oscillations.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have demonstrated that buffeting can be mitigated by placing vortex generators near the leading edge of the wing and by using trailing-edge deflectors (Caruana et al 2005). Other studies have focused on wing morphing and shape optimization (Babinsky & Ogawa 2008;Wengang et al 2020). These techniques aim at reducing shock strength by smearing the normal shock into a λ-shock thus delaying shock-induced separation and abating shock-induced oscillations.…”

Section: Introductionmentioning

confidence: 99%

Transonic leading-edge stall flutter: modelling, simulations and experiments

Currao

2024

J. Fluid Mech.

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This work is a numerical and experimental study of a rectangular thin plate undergoing stall flutter at Mach 0.8. This constitutes one of the first studies of this kind where three-dimensionality is fully implemented in a numerical simulation including the test-section effects characterizing wind-tunnel experiments. In order to break down the fluid–structure interaction to its main driving phenomena, an aerodynamic model is proposed that is based on computationally inexpensive steady-state simulations. Two types of dynamic instability are observed in the numerical simulations; Flutter by mode coalescence is promoted at zero flow incidence, however, high bending precludes this from happening for higher values of angle of attack. Stall flutter is instead a nonlinear one-degree type of instability. Both of these instability mechanisms can be explained in terms of hysteretic behaviour of the pressure distribution, which becomes more pronounced at high angles of attack, when a large separation region is formed. Tests were conducted employing titanium alloy plates in order to survive the aerodynamic loads characterizing the wind-tunnel initial transient. However, due to wall interference, high bending was promoted so that the internal stress exceeded the yield values before flutter could be measured. Numerical simulations were in general agreement with the experiment in terms of both amplitude and oscillation frequency.

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A novel approach for obtaining optimum shape design with the minimum drag coefficient

Abolpour

Hekmatkhah

Shamsoddini

2022

Struct Multidisc Optim

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Shape optimization to improve the transonic fluid-structure interaction stability by an aerodynamic unsteady adjoint method

Cited by 20 publications

References 45 publications

Stick-free Flight Stability Problem Revisited: A Modeling and Simulation Approach

Stick-free Flight Stability Problem Revisited: A Modeling and Simulation Approach

Transonic leading-edge stall flutter: modelling, simulations and experiments

A novel approach for obtaining optimum shape design with the minimum drag coefficient

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