PrandtlPlane Joined Wing: Body freedom flutter, limit cycle oscillation and freeplay studies

Cavallaro, Rauno; Bombardieri, Rocco; Demasi, Luciano; Iannelli, Andrea

doi:10.1016/j.jfluidstructs.2015.08.016

Cited by 30 publications

(21 citation statements)

References 44 publications

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“…Dierent studies on this topic [5,17,21,22] highlighted common design features which are responsible for amplifying the interaction between rigid and elastic dynamics. These references showed that inertia and stiness play a decisive role in modifying free-vibration properties, bringing the lowest elastic natural frequencies closer to the frequencies characteristic of the vehicle motion.…”

Section: Preliminary Considerations and Test Case Denitionmentioning

confidence: 99%

Study of Flexible Aircraft Body Freedom Flutter with Robustness Tools

Iannelli

Marcos

Lowenberg

2018

Journal of Guidance, Control, and Dynamics

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Features that complicate its study are the presence of multiple modal instabilities, and the dierent inuence that system parameters have on each of them. The robust analysis framework based on Linear Fractional Transformation modeling and structured singular value µ analysis is used in this work to study the BFF problem in a systematic way. The analyses performed showcase the potential of these methods, not only in supplying a characterization of the system in terms of its robustness, but also in gaining further understanding of the BFF problem and reconciling the results with physical features. It is also shown that the robust modeling analysis framework complements the conventional, state of practice, methods while allowing the study of highly coupled systems (of which the exible aircraft is an example) to be addressed in an incremental and methodological manner.

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Section: Preliminary Considerations and Test Case Denitionmentioning

confidence: 99%

Study of Flexible Aircraft Body Freedom Flutter with Robustness Tools

Iannelli

Marcos

Lowenberg

2018

Journal of Guidance, Control, and Dynamics

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“…CSHELL is an FSI solver developed by the authors of references [17,18]. Among the available implemented capabilities, in here only the modules and methods required for the proposed framework are described.…”

Section: Cshell: An Advanced Fluid-structure Interaction Solvermentioning

confidence: 99%

“…The fuselage is modeled as a beam, whose properties have been extrapolated and scaled back from the work in [38]. This case study is an evolution of that considered in [18] where only the fuselage inertial effects were retained.…”

Section: Case Study 1: Wing Plus Elastic Fuselage (Wf)mentioning

confidence: 99%

Linear Fractional Transformation co-modeling of high-order aeroelastic systems for robust flutter analysis

Iannelli

Marcos

Bombardieri

et al. 2020

European Journal of Control

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This article presents a new paradigm for robust flutter modeling and analysis of high-order uncertain and linear aeroelastic systems. The fundamental idea is to couple the state-of-art in robust worst-case analysis (Linear Fractional Transformation modeling and µ analysis) with the state-of-practice in aeroelasticity (fluidstructure-interaction solvers). The issue with the latter is that, although capable of providing different levels of fidelity, they are less efficient in coping with the analysis of systems subject to uncertainties. In fact, while they have the advantage of capturing directly the physical uncertainty, the analyses can only be applied to a defined parameter combination, and due to their computational cost, it is usually only possible to consider a limited set of cases. To tackle this lack of robustness, in recent works the application of analytic worst-case methods has been proposed, but the intimately related problem of constructing accurate uncertain models has not been fully addressed. In this article, a co-modeling framework is presented that leverages the main features of both fluid-structure interaction solvers and robust control-based methods. The key idea is to combine these two typically distinct steps in a single one, enabling in this way to obtain an uncertainty description which is flexible and reconciles the physical sources of uncertainty with the uncertain parameters used in the LFT model. An exemplification of the developed framework on an unconventional aircraft configuration is provided. Results show its potential to provide valuable physical insights into the problem when analyzing complex systems.

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“…Moreover, a structural optimisation of the spars of an ultra-light PrP seaplane has been recently presented in [7,8]. Paradoxically, in the literature there are more works about PrP aeroelasticity aspects (including non-linear ones) [4,[9][10][11][12][13], than works focusing on general structural behaviour of the PrP.…”

Section: Introductionmentioning

confidence: 99%

PrandtlPlane wing-box least-weight design: A multi-scale optimisation approach

Scardaoni

Montemurro

Panettieri

2020

Aerospace Science and Technology

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The PrandtlPlane (PrP) aircraft wing-box least-weight design is presented in this work. This design problem is formulated as a constrained non-linear programming problem (CNLPP), by integrating static, buckling, fatigue and manufacturability requirements, under different loading conditions. The solution search is carried out by means of a suitable multi-scale optimisation (MSO) approach. The physical responses involved into the CNLPP formulation are evaluated at the wing-box architecture level (macroscopic scale) and at the stiffened panel level (component scale), as well. The scale transition is ensured by means of a suitable global-local (GL) modelling approach, while the CNLPP is solved by means of an in-house genetic algorithm. The effectiveness of the proposed approach is tested on the PrP wing-box structure, but the presented strategy can be easily extended to conventional aircraft wings.

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PrandtlPlane Joined Wing: Body freedom flutter, limit cycle oscillation and freeplay studies

Cited by 30 publications

References 44 publications

Study of Flexible Aircraft Body Freedom Flutter with Robustness Tools

Study of Flexible Aircraft Body Freedom Flutter with Robustness Tools

Linear Fractional Transformation co-modeling of high-order aeroelastic systems for robust flutter analysis

PrandtlPlane wing-box least-weight design: A multi-scale optimisation approach

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