Dynamic performance evaluation of a compound planetary variable-speed transmission system
CAO Yang
LI Zhengminqing
LI Letian
Abstract：[Objective]In order to clarify the resonance characteristics,dynamic load,and even load laws of the NASA LCTR2 project composite planetary gear variable speed transmission system in high and low speed gears,and to make up for the existing research deficiencies in the coupling analysis of the dynamic characteristics of dual gear planetary transmission,relevant research was carried out to meet the dynamic performance evaluation requirements of the system.[Methods]Firstly,a multi-degree-of-freedom translational-torsional dynamic model was established using the lumped mass method.Secondly,dynamic equations were derived and solved via Matlab/Simulink software to obtain response data.Thirdly,natural modes were calculated,and the accuracy of the model was verified by modal tests with a modal assurance criterion value≥0.7.Finally,comprehensive meshing errors were introduced to analyze the effects of input speed and load torque on dynamic load and load sharing coefficients.[Results]The natural frequencies and resonance speeds for the low-speed gear(231.7-10 723.9 Hz)and high-speed gear(556.8-10 723.1 Hz)were identified.Both dynamic load and load-sharing coefficients increase with the increase of the input speed,with the high-speed gear's dynamic load coefficient being more speed-sensitive.Conversely,both coefficients decrease as the load torque increases,particularly for the internal meshing dynamic load coefficient.Reducing input speed and increasing load torque appropriately can improve the system's dynamic characteristics.
Keywords：Variable-speed drivePlanetary gear trainDynamic characteristicTranslational-torsional modelRotorcraft
Publication Date：2026-05-31
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：12( 14-24,32 )