Analysis of the influence of nonlinear energy sink parameters applicable to helicopter main reduction systems

In response to the vibration problem of helicopter fuselage caused by continuous rotor periodic excitation force, a nonlinear energy sink is considered to be installed on the main reduction transmission channel to reduce the vibration level of the fuselage. This article conducts an analysis of the i...

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Bibliographic Details
Published in:Journal of physics. Conference series 2024-10, Vol.2853 (1), p.12012
Main Authors: Dai, Zhixiong, Feng, Zhizhuang, Qian, Feng, Lu, Xing, Xing, Longtao
Format: Article
Language:English
Subjects:
Absorbers
Airframes
Amplitudes
Dampers
Dynamic models
Energy
Fuselages
Harmonic balance method
Harmonic excitation
Helicopters
Nonlinear response
Nonlinear systems
Parameters
Stability analysis
Stability criteria
Stiffness
Systems stability
Vibration analysis
Vibration control
Vibration damping
Vibration isolators
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Summary:In response to the vibration problem of helicopter fuselage caused by continuous rotor periodic excitation force, a nonlinear energy sink is considered to be installed on the main reduction transmission channel to reduce the vibration level of the fuselage. This article conducts an analysis of the influence of nonlinear energy sink structure parameters under harmonic excitation force, establishes a coupled dynamic model of helicopter main reduction/absorber/fuselage, and uses harmonic balance method and stability analysis theory to analyze the periodic solution and stability of the system. Using the vibration amplitude of the system as the evaluation criterion, the influence of damping, stiffness, and mass ratio on the vibration suppression effect of the nonlinear energy sink was explored. The results showed that as the damping of the nonlinear energy sink increased, the resonance frequency of the coupled system shifted to the left, and the vibration amplitude of the main reduction system increased; As the stiffness of the nonlinear energy sink increases, the vibration amplitude of the coupled system will first decrease and then increase, gradually approaching the vibration amplitude of the system without coupled dampers; The influence of mass ratio on system amplitude follows the same trend as the influence of stiffness. By optimizing, the structural parameters of the nonlinear absorber with good vibration suppression effect are ultimately obtained.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2853/1/012012