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ANonlinear self-excited force series of static5:1 rectangular cylinder and aeroelastic wind tunnel testsWind tunnel test are carried out on the section model of a 5:1 rectangular cylinder5:1 rectangular cylinder to study the nonlinear self-excited forces during post-criticalPost-flutter flutter oscillations. Great care is devoted to realizing perfectly synchronous measurements of model displacement and aerodynamic pressures. Both limit-cycle oscillations and transient response are analysed. Amplitude-dependent flutter derivativesFlutter derivatives are also obtained and discussed. Strongly, nonlinear and unsteady features of self-excited forces emerge from the analysis on hysteresis loops.

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Nonlinear Self-excited Forces on a 5:1 Rectangular Cylinder in Post-critical Torsional Flutter

  • 会议论文

  • 发表日期：

    2026年

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  • Chaoqun Wang,
  • Tommaso Massai,
  • Niccolò Barni,
  • Xugang Hua,
  • Claudio Mannini

摘要

ANonlinear self-excited force series of static5:1 rectangular cylinder and aeroelastic wind tunnel testsWind tunnel test are carried out on the section model of a 5:1 rectangular cylinder5:1 rectangular cylinder to study the nonlinear self-excited forces during post-criticalPost-flutter flutter oscillations. Great care is devoted to realizing perfectly synchronous measurements of model displacement and aerodynamic pressures. Both limit-cycle oscillations and transient response are analysed. Amplitude-dependent flutter derivativesFlutter derivatives are also obtained and discussed. Strongly, nonlinear and unsteady features of self-excited forces emerge from the analysis on hysteresis loops.