In the modeling and analysis of herringbone star gear train (HSGT), the differences in dynamic parameters and loads on both sides of the herringbone gears are usually ignored, which seriously impairs the system load-sharing performance. In this paper, the component modal synthesis method is used to solve the condensation model of the casing and the carrier. A herringbone gear meshing model with tooth surface modification and uneven meshing deformation is proposed, which accurately characterizes the dynamic load distribution of helical gears on both sides. Then, a rigid-flexible coupled dynamic model of HSGT is constructed. The effects of differentiated support stiffness on both sides and modification parameters on the offset load are analyzed, and multi-objective optimization of the dynamic performance of HSGT is carried out. A star gearbox test bench is built to test the improvement effect of differentiated modification parameters on offset load. This study provides guidance for the structural and modification design of HSGT, and improves the system load-sharing performance and vibration characteristics.
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