This experimental thesis aims to develop and set up a total of two test benches concerning the validation of Simulink prognostic models. De facto, in the context of this thesis, I have worked on two main topics: 1. an upgrade of a pre-existent experimental test bench with the aim of studying mechanical plays consequences on an additive manufacturing based planetary gearbox assembly; 2. the design and production phases of a different test platform, concerning fatigue implications on planetary gearboxes performance models. The modelling, testing and research has been carried out with eng Luca Boggio and dr. eng. Matteo Bertone with the indispensable help of eng Pier Carlo Berri.