Design methodology of a two-degrees-of-freedom gravitational energy harvester

Abstract The growing spread of IoT (Internet Things) and monitoring system based on micro electro-mechanical (MEMS) concerns also the railway systems. recent developments have made it possible to study realize innovative integrated systems using connected devices. technologies allow collect real-time data from assets, thus providing fundamental information regarding operation conditions offering an evaluation safety durability monitored device. major innovation these devices is use energy harvesters support or replace their power supply, making device completely autonomous drastically lowering maintenance costs. work presented in this paper product research group knowledge vibrational harvesting. In particular, we studied a two-degrees-of-freedom (2DOF) gravitational vibration-based harvester (GVEH), characterized by absence magnet top end tube, exploiting gravity as restoring force. Different masses configuration were tested order find best optimizing output, frequency bandwidth overall performances. time-domain simulations realized Matlab/Simulink environment are supported with Multiboduy for better understanding dynamics.