The key factors to solve dynamic low pressure seal including swing difference between oil seal and parts during motion,wheel rim assembly and adjustment,and oil seal manufacture were provided according to the(effect) of the construction and moving parts on oil seal.

Aiming at the current situation that the large quantity,the dispersive position and the insufficient reactive-power compensation of distribution transformers,a intelligent monitoring equipment based on GPRS(General Packet Radio Service) and low-voltage dynamic reactive power compensation technology,is researched.

The handling characteristics degradation of aircraft in the low dynamic pressure situation can cause that the flight path angle cannot track the attitude angle,and then the safety of carrier landing is influenced.