Vibration and Assembly Parameter Sensitivity Analysis of Aeroengine Accessory Housing Transmission System Based on Sobol-SVM

CHEN Rui; SHA Yundong

doi:10.7643/issn.1672-9242.2026.09.006

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (9) : 60-66. DOI: 10.7643/issn.1672-9242.2026.09.006

Special Topic—Structural Dynamics of Aviation Equipment

Vibration and Assembly Parameter Sensitivity Analysis of Aeroengine Accessory Housing Transmission System Based on Sobol-SVM

CHEN Rui, SHA Yundong^*

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Abstract

The work aims to investigate the relationship between the total vibration amplitude of the bearing housing gear and assembly parameters, and propose a parameter impact evaluation method integrating Sobol sensitivity analysis with an agent model. First, an agent model linking the total vibration amplitude of the bearing housing gear to assembly parameters was constructed using support vector machine regression (libsvm). A sample set of assembly parameters was generated via the Monte Carlo method. The established agent model was employed to calculate output values for each parameter, followed by Sobol sensitivity analysis to determine both first-order and total effect sensitivity coefficients, quantifying the influence of individual assembly parameters on overall vibration amplitude from a holistic perspective. Finally, sensitivity results were ranked to identify critical parameters. Experimental findings indicated that the bearing outer ring fit dimension (on the main pump side) and tooth direction tolerance contributed most significantly to total vibration amplitude, while the interaction between tooth profile tolerance and other parameters also exhibited substantial impact. This methodology provides a theoretical foundation and quantitative guidance for vibration control and assembly process optimization of bearing housing gears.

Key words

engine accessory housing / assembly parameters / gear vibration / sensitivity analysis / support vector machine

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CHEN Rui, SHA Yundong. Vibration and Assembly Parameter Sensitivity Analysis of Aeroengine Accessory Housing Transmission System Based on Sobol-SVM[J]. Equipment Environmental Engineering. 2026, 23(9): 60-66 https://doi.org/10.7643/issn.1672-9242.2026.09.006

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