A unified analytical model to calculate no-load power losses for the coexistence of windage-churning phenomenon for spiral bevel gearsYu Dai, Cai hua Yang, Ru Zhang and Xiang ZhuEur. Phys. J. Plus, 139 3 (2024) 255DOI: https://doi.org/10.1140/epjp/s13360-024-05055-9