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journalArticle Lu Wenjia Zhang Yimin Cheng Hongchuan Zhou Yang Lv Hangyuan bearing support force box substructure system coupling dynamics dynamic meshing force multistage gears transmission subsystem static substructure method Research on dynamic behavior of multistage gears-bearings and box coupling system The coupling dynamic model of the multistage gears transmission subsystem and the box subsystem is established. The static substructure method is used to extract the dynamic model parameters of the box. Study of the dynamic behavior of the gearbox coupling system shows, the acceleration of the rotors are mainly excited by gear meshing frequency and its harmonic, meshing frequency of the high-speed gears has a more obvious excitation effect on the system, gear meshing excitation is the cause of the rotor’s acceleration. It shows that the coupling model which is closer to the actual situation is helpful to the lightweight design of the system. The frequency amplitude of the low frequency region is significantly higher than the amplitude of the high frequency region for bearing force, which indicates that the external excitation caused by the cutting load is the main reason for the dynamic force of the system. 107096 September 25, 2019 http://www.sciencedirect.com/science/article/pii/S0263224119309625 2019-10-03 07:10:37 ScienceDirect Measurement Measurement DOI 10.1016/j.measurement.2019.107096 ISSN 0263-2241