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Wind Tunnel Measurement of Pitch-Damping Derivative Using Forced Oscillation Technique

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Novel Techniques in Maintenance, Repair, and Overhaul (ISATECH 2022)

Part of the book series: Sustainable Aviation ((SA))

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Abstract

The main task of dynamic experiments in wind tunnels is to obtain model-scale stability information of an aircraft at realistic Reynolds and Mach numbers. The forced oscillation technique is the most widely used wind tunnel technique for stability derivatives measurements. The oscillatory motion is induced to a model in one (the primary) degree of freedom. The aerodynamic reaction measured in the primary degree of freedom determines direct damping derivatives. Stability derivatives are obtained from in-phase and out-of-phase components of the measured aerodynamic reactions. This paper describes the determination of the pitch-damping derivative in the T-38 wind tunnel. The T-38 pitch/yaw apparatus is a full-model forced oscillation apparatus with primary angular oscillation around the wind tunnel model transversal axis. The model is forced to oscillate at constant amplitude. Test results obtained in the T-38 wind tunnel are compared with published experimental data of one of the world’s leading wind tunnels: Arnold Engineering Development Center-von Karman (AEDC, USA).

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Abbreviations

Cmα:

Pitching moment coefficient due to angle of attack

\( {C}_{\mathrm{m}\mathrm{q}}+{C}_{\mathrm{m}\dot{\upalpha}} \):

Pitch-damping derivative coefficient

Iy:

Pitch moment of inertia

lref:

Reference length

Mα:

Pitching moment due to angle of attack

\( {M}_{\mathrm{q}}+{M}_{\dot{\upalpha}} \):

Pitch-damping derivative

MT:

Excitation moment in pitch

Sref:

Reference area

t:

Time

V:

Free stream velocity

q∞:

Dynamic pressure

α:

Angle of attack

η:

Phase shift between model oscillatory motion and excitation moment

θ:

Angular oscillation in pitch

|...|:

Amplitude

References

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Acknowledgments

This work was supported by the Ministry of Education, Science andTechnological Development of the Republic of Serbia (Contract No.451-03-68/2022-14/200325).

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Authors and Affiliations

  1. Military Technical Institute (VTI), Belgrade, Serbia

    Marija Samardžić

Authors
  1. Marija Samardžić
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Editor information

Editors and Affiliations

  1. Faculty of Aeronautics and Astronautics, Eskisehir Technical University, Eskisehir, Türkiye

    T. Hikmet Karakoc

  2. Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

    Ivan A. Kostić

  3. Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

    Aleksandar Grbović

  4. Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

    Jelena Svorcan

  5. School of Aviation, Süleyman Demirel University, Keciborlu, Isparta, Türkiye

    Alper Dalkiran

  6. Porsuk Vocational School, Eskisehir Technical University, Eskisehir, Türkiye

    Ali Haydar Ercan

  7. Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

    Ognjen M. Peković

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Samardžić, M. (2024). Wind Tunnel Measurement of Pitch-Damping Derivative Using Forced Oscillation Technique. In: Karakoc, T.H., et al. Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham. https://doi.org/10.1007/978-3-031-42041-2_5

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  • DOI: https://doi.org/10.1007/978-3-031-42041-2_5

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-031-42040-5

  • Online ISBN: 978-3-031-42041-2

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