Vibration suppression design for a turboshaft engine with shared bearing cavity structure
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Gaiqi Li
,
Yu Lu
Abstract
To develop advanced civil turboshaft engine with long life and high reliability, research on vibration suppression technology was conducted for a turboshaft engine with shared bearing cavity structure. The nonlinear dynamic model of the dual-rotor system with shared bearing cavity was established with nonlinear forces of the supports considered. The presence of vibration coupling in the dual-rotor system with shared bearing cavity structure was found, which would increase the resonance opportunities of the rotor system and might lead to disastrous accidents. The mechanism of coupled vibration was revealed. Then an optimization algorithm was developed to optimize the shared bearing cavity structure. Thus the vibration of the whole engine can be reduced and isolated. After implementing the optimization measures, over 15,000 h bench test and flight tests were conducted successfully. The experimental results demonstrated that the engine’s overall vibration reduction design was reasonable, with vibration levels effectively controlled. During long-duration, multi-condition, and full-speed-range operations, the steady-state vibration amplitudes remained below 12 mm/s, exhibiting stable vibration characteristics and significantly lower than the design requirements for turboshaft engines.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission. GQ L: Methodology. ZH T: Investigation and Writing-Original Draft. Y L: Conceptualization. JF W: Validation. XW J: Supervision and Writing - Review & Editing. DY M: Formal analysis & Data Curation.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: The participants of this study did not give written consent for their data to be shared publicly, so due to the sensitive nature of the research supporting data is not available.
Nomenclature (SI Units)
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translational dof of the beam element in
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translational dof of the beam element in
- θ
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rotational degrees of freedom of the beam element in x direction;
- φ
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rotational degrees of freedom of the beam element in y direction;
- M e
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inertia matrix of the beam element;
- K e
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gyroscopic matrix of the beam element;
- G e
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stiffness matrix of the beam element;
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external load acting on the beam element;
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inertia matrix of the disk;
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gyroscopic matrix of the disk;
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mass of the disk;
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diametral moment of inertia of the disk;
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polar moment of inertia of the disk;
- f b
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nonlinear force from the rolling bearing;
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nonlinear force from the SFD;
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stiffness of the squirrel cage;
- M
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inertia matrix of the rotor system;
- K
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gyroscopic matrix of the rotor system;
- G
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stiffness matrix of the rotor system;
- ω 1
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rotational speeds of the power turbine rotor;
- ω 2
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rotational speeds of the gas generator rotor;
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