Research on vibration avoidance design method of the aero-engine gear transmission system based on web structure optimization
ZHANG Yangming
LI Bo
LIU Huaiju
WANG Qiao
LI Yang
Abstract：[Objective]Aiming at the problem that the gear transmission system of aero-engines is prone to traveling wave resonance under complex operating conditions,which further restricts high-reliability lightweight design,the vibration avoidance optimization of gear web structure was carried out.[Methods]Firstly,a surrogate model for gear modal frequencies was constructed based on Kriging interpolation method and Bayesian hyperparameter optimization to replace high-cost numerical analysis and efficiently predict the influence of structural parameters on natural frequencies.Secondly,a multi-objective optimization mathematical model was established with web thickness ratio and rim ratio as design variables,aiming at minimizing system mass and maximizing comprehensive mesh stiffness.Thirdly,the surrogate model was embedded into the non-dominated sorting genetic algorithm Ⅲ framework,and multiple constraints including resonance speed margin were imposed to conduct multi-objective iterative optimization.Finally,the technique for order preference by similarity to ideal solution was adopted to comprehensively evaluate the Pareto front solutions and select the optimal structural scheme.[Results]The results show that the coefficients of determination(R2)of the established surrogate model for the first three nodal diameter natural frequencies of gears reach 96.8%,94.7%,and 98.8%,respectively,and the prediction accuracy meets the requirements of engineering design.After optimization,the resonance points of six gears with traveling wave resonance risks under continuous and high-speed operating conditions are all effectively avoided.Compared with the initial design scheme,the total mass of the gear set is reduced by 14.4%,and the contact and bending fatigue safety factors of each gear still meet the strength standards of greater than 1.25 and 1.5,respectively,which provides a reference for the lightweight design of aviation gear transmission structures.
Keywords：Aero-engineAccessory gearboxSurrogate modelTraveling wave resonanceLightweight design
Publication Date：2026-08-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：11( 137-147 )