Abstract
This paper addresses an important issue of the individual layer thickness influence in a multilayer piezo composite on electro-mechanical energy conversion. The use of energy harvesting systems seems to be very promising for applications such as ultra-low power electronics, sensors and wireless communication. The energy converters are often disabled due to a failure of the piezo layer caused by an excessive deformation/stresses occurring upon the operation. It is thus desirable to increase both reliability and efficiency of the electromechanical conversion as compared to standard concepts. The proposed model of the piezoelectric vibration energy harvester is based on a multilayer beam design with active piezo and protective ceramic layers. This paper presents results of a comparative study of an analytical and numerical approach used for the electro-mechanical simulations of the multilayer energy harvesting systems. Development of the functional analytical model is crucial for the further optimization of new (smart material based) energy harvesting systems, since it provides much faster response than the numerical model.
Highlights
The generation of electricity from alternative sources of energy has become a hot topic during the last years, especially in connection to Industry 4.0 applications [1,2]
The standard structure of the piezoceramic energy converters is supplemented with protective layers
These layers will provide higher reliability of the piezoceramics and they will change the electromechanical properties of piezoceramic structure, because they will introduce residual stresses in the whole multilayer system
Summary
The generation of electricity from alternative sources of energy has become a hot topic during the last years, especially in connection to Industry 4.0 applications [1,2]. The energy obtained in such way is called “green energy”. Another way to get “free energy” is to convert mechanical energy into electrical, especially from vibrations. In this design, the standard structure of the piezoceramic energy converters is supplemented with protective layers. The standard structure of the piezoceramic energy converters is supplemented with protective layers These layers will provide higher reliability of the piezoceramics and they will change the electromechanical properties of piezoceramic structure, because they will introduce residual stresses (tensile or compressive) in the whole multilayer system. The outer (protective) layers, prepared from a mechanically durable material and enhanced with internal compressive stresses, can protect the inherently brittle piezoceramics and the presence of internal stresses in the piezoceramic layer can further enhance its electromechanical characteristics
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