Researching and analyzing principles of false twisting and wrapping,a brand-new vortex nozzle that takes the mechanism of air-jet as an example is designed and attached into SAVIO winder so as to reduce the yarn hairiness.

Based on its own structure information restriction and the restriction conditions of inclusion principle of large scale systems,a new decomposing method is presented.

A new strategy for choosing overlapping decomposition complementary matrices is presented in the framework of the inclusion principle,and the influence of different complementary matrices to control performances is analyzed.

By means of the restriction conditions of the system inclusion principle and LQ optimal control algorithm,a decentralized control based on the two single-area subsystems is proposed for two-area overlapping interconnected power system .

Directed toward it’s defects,we put forward a plan which is based on envelope principle to variate gear form ,obtain dedendum transition curve of greater trochanter which is based on envelope p.