2134/21583 Ehsan Fatourehchi Ehsan Fatourehchi Mahdi Mohammadpour Mahdi Mohammadpour Paul King Paul King Homer Rahnejat Homer Rahnejat G. Trimmer G. Trimmer B. Womersley B. Womersley Effects of gear modification and surface finish on planetary gear systems efficiency Loughborough University 2016 Tribology Gear tribology Planetary gear set Mechanical Engineering not elsewhere classified 2016-06-10 10:23:14 Conference contribution https://repository.lboro.ac.uk/articles/conference_contribution/Effects_of_gear_modification_and_surface_finish_on_planetary_gear_systems_efficiency/9554189 Planetary gear systems offer desired speed and torque variation with a compact and lighter construction than traditional gear trains. Transmission losses are one of the main concerns. Modification of gear teeth geometry is one of the remedial actions to reduce friction.