More and more frequently harvesters replace in practice batteries and accumulating power-supplying low-consumption electronic devices. [1]. The main advantage of these devices is that they do not require maintenance and can be used in large-scale infrastructure projects, where they convert mechanical vibrations into electrical energy [2]. Piezoelectric harvesters are among the most widely used type of them, as their construction is simple and reliable, on the one hand, and due to their small size and low price, on the other hand [3].This paper studies and models two piezoelectric harvesters, consisting of piezoelectric transformers, rigidly fixed at their low end and having two springs with a common concentrated mass, fixed at the top. One of the harvesters has smaller springs and a smaller concentrated mass than the other. Modelling of the piezoelectric two-spring harvesters has been done by means of ANSYS R19.1 and experimental tests have been carried out to validate the models.
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