In this thesis the influence of vacuum on the damping coefficient and efficiency of a vibration energy harvester is analysed. Also, this thesis deals with design and characterization of a primary structure with integrated vibration energy harvester which also acts as a dynamic vibration absorber. Mechanical parts of the device are designed in such a way that they can be manufactured using 3D printing technology, in particular, using Prusa i3 MK3S 3D printer. The structure is designed in such a way that it can be evacuated using a standard vacuum pump that is ordinarily used for air conditioning systems maintenance. Also, the dynamic response of the structure is approximated using a mathematical model assuming a two degrees of freedom linear mechanical system. This is achieved by using CAD/CAM tools for modelling of the mechanical parts of the device, and Finite Element Method (FEM) tools for the free vibration analysis of the flexible mechanical parts of the device. Furthermore, the harvester has been designed so that two electrodynamic transducers PBA Systems CVC40–HF–6.5 mounted in parallel can be used for the transduction of mechanical into electrical energy. The final design has been manufactured, assembled and characterized by measuring the frequency response function between the voltage applied to the electrical terminals of one of the two transducers and the voltage induced on the electrical terminals of the other transducer. Effect of vacuum on the damping coefficient of the two electrodynamic transducers has been defined experimentally. Optimal parameters of the system were found analytically which maximise useful power output and minimize the primary structure vibrations in cases with and without vacuum inside the energy harvester. Effect of vacuum on the energy conversion efficiency was evaluated by comparing the harvested energy in the case when the air is present in the energy harvester interior to the harvested energy in the case when its interior is evacuated.