Theoretical analysis of vibration energy harvesters with nonlinear damping and nonlinear stiffness Dongmei Huang, Ruihong Li, Shengxi Zhou and Grzegorz Litak Eur. Phys. J. Plus, 133 12 (2018) 510 Published online: 11 December 2018 DOI: 10.1140/epjp/i2018-12298-0