Theoretical analysis of an impact-bistable piezoelectric energy harvester Zhengqiu Xie, C. A. Kitio Kwuimy, Tao Wang, Xiaoxi Ding and Wenbin Huang Eur. Phys. J. Plus, 134 5 (2019) 190 Published online: 06 May 2019 DOI: 10.1140/epjp/i2019-12569-2