Model Updating and Aeroelastic Correlation of a Scaled Wind Tunnel Model for Active Flutter Suppression Test

Leone, Domenico Di; Balbo, Francesco Lo; Gaspari, Alessandro De; Ricci, Sergio

doi:10.3390/aerospace8110334

Cited by 3 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beam-ribs with variable cross-section were applied to the horizontal tail model to obtain a reasonable mass distribution and stiffness distribution. Compared to the flat-plate wing model, the present three-dimensional model may have more similar dynamic characteristics to the actual aircraft [28][29][30][31][32]. In addition, the thicknesses of the bending and torsion leaf-springs were selected as 3.5 mm and 3.2 mm, respectively.…”

Section: Model Design and Manufacturementioning

confidence: 99%

Experimental Aeroelastic Investigation of an All-Movable Horizontal Tail Model with Bending and Torsion Free-Plays

Bai

Qian

et al. 2023

Aerospace

View full text Add to dashboard Cite

In this study, an experimental investigation is performed on a scaled, all-movable horizontal tail to study the aeroelastic behaviors induced by multiple free-plays. The dynamic response in wind tunnel tests is measured by strain gauges, an accelerometer, and a binocular vision measurement system. The obtained results indicate that the present aeroelastic system exhibits highly nonlinear characteristics and undergoes two independent limit cycle oscillations (LCOs) induced by bending free-play and torsion free-play, respectively. Further, various parametric studies are conducted to evaluate the effects of the free-play angles, angle of attack, flow velocity, and gust excitation on the LCOs. It is found that the value of free-play angle has no significant effect on the critical flow velocity which leads to the occurrence of LCOs. The amplitude and frequency of LCOs increase with the increasing free-play angle and flow velocity. Moreover, the horizontal tail experiences high-order harmonic resonances when LCOs appear. Finally, the stability of limit cycles is analyzed based on the gust excitation experiment. Overall, compared to an all-movable horizontal tail with single free-play, the multiple free-plays system exhibits more complex dynamic behaviors. In this paper, the measured results of the scaled model, which has a similar mass distribution and stiffness distribution as actual aircraft, may be valuable for predicting such LCOs induced by multiple free-plays, and providing a reference for the design of all-movable horizontal tail to prevent LCOs.

show abstract

Section: Model Design and Manufacturementioning

confidence: 99%

Experimental Aeroelastic Investigation of an All-Movable Horizontal Tail Model with Bending and Torsion Free-Plays

Bai

Qian

et al. 2023

Aerospace

View full text Add to dashboard Cite

show abstract

“…The GVTs were not used just as final verification of the dynamic properties of the model but as a tool for tracking and identifying them and for updating the corresponding numerical models [30]. The results of the final GVT carried 14 out on the complete model before the wind tunnel test campaign are reported below.…”

Section: A Ground Vibration Tests (Gvt)mentioning

confidence: 99%

“…In the second, more aggressive optimization implementation, a larger number of design variables were introduced, including also the stiffness of the wing-fuselage connection block. More details about the two updating processes can be found in [30], and Table 5 reports the comparison between the experimental results and the numerical results after the first and the second optimization based model updating steps, of the first three modes. One important aspect must be noted here: the second model identification process required more time than what was available due to the tight calendar of the wind tunnel.…”

Section: B Modal Correlation and Updatingmentioning

confidence: 99%

Wind Tunnel System for Active Flutter Suppression Research: Overview and Insights

Ricci¹,

Toffol²,

Gaspari³

et al. 2022

AIAA Journal

Self Cite

View full text Add to dashboard Cite

The paper describes the development of a new state of the art large wind tunnel model for active flutter suppression studies as well as the supporting techniques used in tests focused on the effects of uncertainty. Design guidelines and the resulting aeroelastic characteristics of the model are covered together with representative test results. Those would allow other researchers working in this area to develop control laws for the new model and evaluate them. A number of important lessons and insight are reported regarding the design of the model, the level of success of commonly used mathematical modelling techniques to capture its behaviour, sources of analysis / test correlation discrepancies, multi-function utilization of control surfaces for both system identification and flutter suppression, active flutter suppression testing safety, and techniques for estimating by tests of the robustness of closed-loop active aeroservoelastic systems. The new system has made it possible to repeatedly "push" the actively controlled model, using various flutter suppression control laws, safely, to the actual flutter limit in tests numerous times. This capability

show abstract

“…Besides, previous studies on free-play-induced LCO mostly focused on two-dimensional airfoil models, and studies on the influence of free-play nonlinearity on 3D models are further needed. [35][36][37] Therefore, one convenient method which can be efficiently applied to any 3D model with complex structures, and can be verified experimentally is demanded.…”

Section: Introductionmentioning

confidence: 99%

Aeroelastic investigation on an all-movable horizontal tail with free-play nonlinearity

Ai,

Bai,

Qian

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

Free-play-induced nonlinear dynamic behavior has been one of the most important topics of aeroelastic research in recent decades. In this paper, the describing function (DF) method is developed to investigate the complex dynamic response of a popular all-movable horizontal tail with free-play. Piecewise expressions for the time history and phase portrait of limit cycle oscillation (LCO) are derived by the developed DF method, which is conducive to understand the mechanism of free-play-induced LCO. Another advantage of the developed DF method is the ability to predict the high-order harmonics, which cannot be realized by the classic DF method. A three-dimensional (3D) all-movable horizontal tail model with torsional free-play was designed and manufactured to implement wind tunnel tests via various initial parameters. A good agreement was found between the numerical and experimental results, which can demonstrate the effectiveness of the proposed method. The influence of the initial parameters of the all-movable horizontal tail on the LCO characteristics is analyzed by both numerical calculations and wind tunnel tests. The method and results in this paper can provide a significant reference for the design of all-movable horizontal tail versus the free-play-induced LCO.

show abstract

Model Updating and Aeroelastic Correlation of a Scaled Wind Tunnel Model for Active Flutter Suppression Test

Cited by 3 publications

References 25 publications

Experimental Aeroelastic Investigation of an All-Movable Horizontal Tail Model with Bending and Torsion Free-Plays

Experimental Aeroelastic Investigation of an All-Movable Horizontal Tail Model with Bending and Torsion Free-Plays

Wind Tunnel System for Active Flutter Suppression Research: Overview and Insights

Aeroelastic investigation on an all-movable horizontal tail with free-play nonlinearity

Contact Info

Product

Resources

About