Introduces the application of current and voltage components of frame leakage protection device in DC traction power supply system, analyzes and discusses the influence of rail potential limiting device and current drainage cabinet to the frame leakage protection and their coordination.

Based on mechanical impedance, the relationship between the me chanical impedance and electric impedance of piezoelectric elements with externa l circuit is analyzed.

When piezoelectric element drives a micro-manipulate system,the output displacement is often less than that in free status.

The achievements in research on reducing carbody bending vibration with the application of piezoelectric elements and branches are described.

A functionally gradient elastic beam bonded with piezoelectric patches is analyzed in the paper.

A functional gradient thin elastic plate bonded with piezoelectric patches on its top and bottom surfaces,is analyzed here.

Semi-active vibration control using piezoelectric elements;

The Current Research on the Nonlinear of PZT;