Coupling analysis of linear vibration energy harvesting systems

•The frequency ranges of the weak, moderate and strong coupling harvester systems.•Numerical ranges of the force factor in the weak, moderate and strong coupling.•The relationships of the coupling parameters of vibration energy harvester systems.

This paper has disclosed the relationship of vibration energy harvester performance with dimensionless force factor. Numerical ranges of the dimensionless force factor have been defined for cases of weak, moderate and strong coupling. The relationships of coupling loss factor, dimensionless force factor, critical coupling strength, coupling quotient, electro-mechanical coupling factor, damping loss factor and modal densities have been established in linear vibration energy harvester systems. The new contribution of this paper is to determine a frequency range where the vibration energy harvesting systems are in a weak coupling and the statistical energy analysis is applicable.