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Aeroelasticity of the PrandtlPlane: Body Freedom Flutter, Freeplay, and Limit Cycle Oscillation

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Variational Analysis and Aerospace Engineering

Part of the book series: Springer Optimization and Its Applications ((SOIA,volume 116))

Abstract

Aeroelasticity of PrandtlPlane configurations is a yet unexplored field. The overconstrained structural system and the mutual aerodynamic interference of the wings enhance the complexity of the aeroelastic response. In this work the aeroelastic behavior of several models based on wing system of 250-seat PrandtlPlane design is studied. When an aluminum version of the structure is considered, flutter is associated with a coalescence of the first two elastic modes, the first being characterized by a classic upward bending of both wings, and the second one being associated with an out-of-phase bending of the two wings and tilting of the lateral joint. Analyses show that energy is injected in the structure mainly at the tip of the front wing, close to the aileron. Effects of freeplay of mobile surfaces are evaluated, showing how, in some cases, an increase in the flutter speed is observed. When flutter analyses are repeated considering the configuration free to pitch and plunge, flutter speed does increase due to a particular interaction between rigid-body pitching and elastic modes. Several of the above findings are demonstrated on more detailed structural models considering also the local stiffness distribution, and taking also into consideration compressibility effects. When composite materials are employed, flutter issues are completely overcome.

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Author information

Authors and Affiliations

  1. Technion - Israel Institute of Technology, Haifa, Israel

    Rauno Cavallaro

  2. Università di Pisa, Pisa, Italy

    Rocco Bombardieri

  3. Università degli Studi Roma Tre, Rome, Italy

    Simone Silvani & Giovanni Bernardini

  4. San Diego State University, San Diego, CA, USA

    Luciano Demasi

Authors
  1. Rauno Cavallaro
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  2. Rocco Bombardieri
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  3. Simone Silvani
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  4. Luciano Demasi
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  5. Giovanni Bernardini
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Corresponding author

Correspondence to Rauno Cavallaro .

Editor information

Editors and Affiliations

  1. Department of Civil and Industrial Engineering, University of Pisa, Pisa, Italy

    Aldo Frediani

  2. Montpellier Institute Alexander Grothen, University of Montpellier, Montpellier, France

    Bijan Mohammadi

  3. LJLL-UPMC Boite, Paris, France

    Olivier Pironneau

  4. Department of Industrial and Civil Engineering, University of Pisa Aerospace Section, Pisa, Italy

    Vittorio Cipolla

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Cavallaro, R., Bombardieri, R., Silvani, S., Demasi, L., Bernardini, G. (2016). Aeroelasticity of the PrandtlPlane: Body Freedom Flutter, Freeplay, and Limit Cycle Oscillation. In: Frediani, A., Mohammadi, B., Pironneau, O., Cipolla, V. (eds) Variational Analysis and Aerospace Engineering. Springer Optimization and Its Applications, vol 116. Springer, Cham. https://doi.org/10.1007/978-3-319-45680-5_3

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