{
  "abstract": "This paper presents aeroelastic experiments conducted in the ONERA S3Ch transonic wind tunnel using a supercritical OAT15A airfoil mounted on a rig allowing independent control of pitch and heave degrees of freedom (DOF). The study investigates fluid-structure interaction (FSI) mechanisms and lock-in phenomena between transonic buffet and structural modes. Aerodynamic and structural responses were monitored using steady and unsteady pressure sensors, high-speed stereoscopic Particle Image Velocimetry (PIV), accelerometers, and optical sensors. Four configurations were tested: rigid (0 DOF), pitch-only (1 DOF pitch), heave-only (1 DOF heave), and combined pitch-heave (2 DOF). The test campaign spanned selected Mach numbers, angles of attack, and structural natural frequencies for each configuration. Results show that buffet-induced lock-in occurs abruptly when the Mach number increases, but only when the pitch DOF is enabled, in both the 1-DOF pitch or 2-DOF configuration. These findings establish that pitch-buffet frequency proximity is a necessary condition for lock-in. In the 2-DOF configuration, continuous Mach number excursions revealed a three-way coupling involving the buffet, pitch, and bending modes, with the bending mode modulating the coupled dynamics. This coupling generates large-amplitude limit-cycle oscillations (LCO) within seconds, persisting over a narrow Mach range before buffet cessation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.16366",
  "author_total": 3,
  "authors": [
    {
      "name": "Cédric Themiot"
    },
    {
      "name": "Vincent Brion"
    },
    {
      "name": "Arnaud Lepage"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8m3ywrgy7tmsc.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.16366",
  "fulltext_url": null,
  "id": "8m3ywrgy7tmsc",
  "issns": [],
  "landing_url": "https://hal.science/hal-05773401v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.class-ph"
    ],
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      "hal",
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      "hal",
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      "hal",
      "2.phys.meca.vibr"
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      "openalex",
      "2202|Aeroelasticity and Vibration Control"
    ]
  ],
  "openalex": "W7221822145",
  "pdf_url": "https://hal.science/hal-05773401/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8m3ywrgy7tmsc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:45Z",
      "native_id": "hal-05773401",
      "source": "hal",
      "url": "https://hal.science/hal-05773401v1"
    },
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.16366",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.16366"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:2.phys.meca.mefl",
      "subfield": "fluid-dynamics"
    }
  ],
  "title": "Experiments on an airfoil with adjustable pitch and heave under transonic buffet leading to lock-in coupling",
  "title_text": "Experiments on an airfoil with adjustable pitch and heave under transonic buffet leading to lock-in coupling",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/8m3ywrgy7tmsc",
  "venue": "HAL",
  "versions": []
}