Harvesting base vibration energy by a piezoelectric inverted beam with pendulum
Pan Jia-Nan, Qin Wei-Yang, Deng Wang-Zheng, Zhou Hong-Lei
       

Response patterns of the second mode at different times: (a) t=49.1 s; (b) t=49.13 s; (c) t=49.17 s; (d) t=49.2 s.