Transient response investigation of gimballed tiltrotors during engage and disengage operations

Hao Kang, Edward Smith

Research output: Contribution to journalArticle

Abstract

An analysis has been developed to predict the transient aeroelastic response of gimballed tiltrotors during shipboard engage/disengage operations. A multi-blade gimballed rotor is modeled with slender elastic beams rigidly attached to a hub and undergoing flap bending, lag bending, elastic twist, and axial deflection. The gimbal restraint is simulated using a conditional rotational spring. Blade element theory is used to calculate quasi-steady loads in linear and nonlinear regimes. The rotor equations of motion are formulated using Hamilton's principle and spatially discretized using the finite element method. The discretized rotor equations of motion are integrated in the modal space for a specified rotor speed run-up profile. Studies for a 1/5 size aeroelastically scaled tiltrotor model are conducted to validate the analysis and investigate the transient response and loads of the gimballed rotor during engagement. Blade bending moment and hub moment predictions indicated that gimbal restraint impacts can induce high transient loads on the rotor blades and hub.

Original languageEnglish (US)
Pages (from-to)154-159
Number of pages6
JournalChinese Journal of Aeronautics
Volume12
Issue number3
StatePublished - Aug 1 1999

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Transient analysis
Rotors
Turbomachine blades
Equations of motion
Bending moments
Finite element method

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanical Engineering

Cite this

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abstract = "An analysis has been developed to predict the transient aeroelastic response of gimballed tiltrotors during shipboard engage/disengage operations. A multi-blade gimballed rotor is modeled with slender elastic beams rigidly attached to a hub and undergoing flap bending, lag bending, elastic twist, and axial deflection. The gimbal restraint is simulated using a conditional rotational spring. Blade element theory is used to calculate quasi-steady loads in linear and nonlinear regimes. The rotor equations of motion are formulated using Hamilton's principle and spatially discretized using the finite element method. The discretized rotor equations of motion are integrated in the modal space for a specified rotor speed run-up profile. Studies for a 1/5 size aeroelastically scaled tiltrotor model are conducted to validate the analysis and investigate the transient response and loads of the gimballed rotor during engagement. Blade bending moment and hub moment predictions indicated that gimbal restraint impacts can induce high transient loads on the rotor blades and hub.",
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Transient response investigation of gimballed tiltrotors during engage and disengage operations. / Kang, Hao; Smith, Edward.

In: Chinese Journal of Aeronautics, Vol. 12, No. 3, 01.08.1999, p. 154-159.

Research output: Contribution to journalArticle

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