For the adaptive system which is desigaed by means of Liyaprof and Bobof s stable theories, by cboosing suitable adaptive law, the nonlinear stability analysis could be done in the quasi-linear or linear range and Laos and Kurewse s stable criterion ould be adoped to make the system have a better robustness.

It makes adaptive system with strong ability of disturbance-rejection possible and practible when the varying ranges about the plant parameters are not known.

The design of controller is the key to the discrete adaptive system of internal mold control(IMC).

Realization of complicated network on 300 MN die forging hydrostatic press control system;

The original control system of a 300 MN die-forging hydrostatic press has inconvenience for operation,low control accuracy,slow response speed and low reliability.

Based on the analysis of lateral-directional control system of a certain plane, representative fault infecting flying security is specialized; flying security is evaluated; it is found that flying security probability can not be content with the flying safety standard.

This paper introduced the structure and working principle of a common automobile door locks, analysed the defects of this automobile door locks from the aspects of collision safety, guard against theft and technics performance, in addition, this paper also introduced an improved lock manipulation system.