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Visualization of Mechanical Processes: An International Online Journal

Publication de 4  numéros par an

ISSN En ligne: 2152-209X

Experimental investigation and mathematical simulation of unsteady aerodynamic characteristics of a transonic cruiser model at small velocities in a wide range of angles of attack

Volume 1, Numéro 2, 2011,
DOI: 10.1615/VisMechProc.v1.i2.40
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RÉSUMÉ

Results of experimental investigation of unsteady aerodynamic characteristics obtained at forced oscillation with various frequencies and amplitudes are considered for the model of transonic cruiser aircraft (TCR) with canard and swept wing. To measure the dynamic derivatives of the model versus angle of attack and frequency, the tests were implemented with the use of a small-amplitude forced oscillation rig. The antidamping depending on the oscillation frequency was observed in a certain range of angles of attack. The dynamic hysteresis loops of aerodynamic characteristics were studied at the model forced oscillations with large amplitudes. The traditional approach based on aerodynamic derivatives failed to take into account the model damping versus oscillation frequency in the flight dynamics problems. The traditional approach also failed to describe adequately the dynamic phenomena for pitch moment coefficient observed at oscillations with large amplitudes at the development of the flow separation. In this paper, two alternative approaches are proposed for the description of all dynamic peculiarities of the pitch moment coefficient observed in the experiment. To describe the dynamic dependence of the pitch moment coefficient, a nonlinear state-space model with an additional differential equation describing effects of the flow separation development lag is used. A neural network is proposed to be used in the second approach. Each of the approaches has its own the pros and cons.

CITÉ PAR
  1. Da Ronch Andrea, Panzeri Marco, Abd Bari M. Anas, d’Ippolito Roberto, Franciolini Matteo, Adaptive design of experiments for efficient and accurate estimation of aerodynamic loads, Aircraft Engineering and Aerospace Technology, 89, 4, 2017. Crossref

  2. Rohacs Jozsef, Goal- and Object-Oriented Models of the Aerodynamic Coefficients, in Flight Physics - Models, Techniques and Technologies, 2018. Crossref

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