Analysis of resonance in a tractor fan system and its improvement
ZHOU Weiwei
ZHAO Jingjing
GUO Bin
FAN Zeng
Abstract：To address the issue of fan blade root fracture during the development of a certain tractor,the combined approach of modal analysis and spectral analysis are employed to identify the root cause under the common operating speed range of a 6-cylinder diesel engine.Based on the findings,an improvement solution is proposed and validated through simulation and endurance testing.The results indicate that the first-order modal frequency of the fan resonated with the third-order excitation frequency of the engine within the common speed range,leading to bidirectional bending fatigue failure at the blade root.By maintaining the fan diameter unchanged and increasing the hub thickness by 2 mm,the first-order modal frequency of the fan is raised from 108 Hz to 150 Hz.The improved fan doesn't break after a 500 h durability test,which indicates that the improvement measures are effective.In the design of rotating machinery systems,it is crucial to control the coupling relationship between the modal frequencies of key components and excitation frequencies.Optimizing structural parameters to adjust modal distribution can mitigate resonance risks while ensuring performance.
Keywords：fanmodal analysisspectral analysisresonance characteristic
Publication Date：2025-09-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 63-67 )