Vibration characteristic analysis of a high-speed dual-planetary speed-increasing gearbox

HUANG Hongtao; SHI Yibo; CHEN Junhao; HUANG Shuaizong; HOU Nai; SHI Lubing

doi:10.16578/j.issn.1004.2539.2026.05.006

Abstract：[Objective]Aiming at the problems of insufficient research on the vibration characteristics of the dual planetary speed-increasing gearbox for high-speed turbine starters,complex internal excitations in the dual planetary gear structure,unclear contribution mechanism of the gearbox vibration,and ambiguous laws of dynamic response peaks and resonance under extreme high-speed operating conditions,taking the dual-planetary speed-increasing gearbox used in the rotor strength test of a high-speed turbine starter as the research object,its vibration characteristics were analyzed.[Methods]Firstly,a rigid-flexible coupling dynamic model of the transmission system,including a flexible housing,was established using simulation software.Secondly,a modal analysis of the system was conducted to obtain the first 15 natural frequencies and modal shapes,and the resonance risk under operating speeds was assessed using a Campbell diagram.Finally,the dynamic transmission error,dynamic contact load,and housing surface vibration acceleration of the system were analyzed.[Results]The research results indicate that the speed-increasing gearbox effectively avoids resonance zones under both operating and maximum speeds.The dynamic transmission error and dynamic contact load exhibit peak values within the input shaft speed range of 12 000-13 500 r/min,with the most significant vibration observed in the Y-direction of the housing.The accuracy of the simulation model is validated through vibration tests,with the relative error between test and simulation results being within 5%.This demonstrates that the developed model can effectively predict the vibration behavior of the system,providing a basis and practical reference for the dynamic design and optimization of similar high-speed planetary gearboxes.