Beijing Institute of Structure and Environment Engineering;
Beijing 100076;
China;
Faculty of Materials and Manufacturing;
Bejing University of Technology;
Beijing 100124;
China;
Beijing Key Laboratory of Nonlinear V ibrations and Strength of Mechanical Structures;
Beijing 100124;
China;
State Key Laboratory of Mechanical Behavior and System Safety of Trafic Engineering Structures;
Shijiazhuang Tiedao University;
Shijiazhuang 050043;
China;
vibration energy harvesting; mechanical amplifier; piezoelectric frame(PF); amplification frame(AF); variable cross-section beam;