| Citation: | LIU Yong, WANG Ran, WANG Dawei, et al. Dynamic characteristics of spline couplings considering the influence of tooth surface topography[J]. Journal of Aerospace Power, 2026, 41（X）：20250448 doi: 10.13224/j.cnki.jasp.20250448
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To improve the accuracy of dynamic modeling for aeroengine spline connected rotors, the influence mechanism of tooth surface roughness on structural dynamic characteristics was investigated. A simulation model of single-tooth-pair engagement with rough surfaces was established to reveal the evolution of normal and tangential meshing stiffness with displacement loads. A dynamic modeling method based on the virtual material method was proposed, and a finite element model of the overall structure considering surface topography was constructed. Results showed that lower roughness improved the uniformity of contact stress distribution and contact stiffness, whereas higher roughness caused contact area loss and induced tooth root slip damage. Roughness reduced the natural frequency and increased the vibration response through stiffness softening, with the first natural frequency being the most sensitive to surface conditions. The specific influence was about 7% on the first natural frequency and 11.8% on the radial vibration amplitude. In contrast, torque loading partially offset the negative effect of roughness by improving the contact state. The established cross-scale analysis framework clarified the influence of micro-topography on local contact behavior and global dynamic response, providing theoretical support for performance prediction and manufacturing process optimization of aeroengine spline connected rotors.
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