Absolute Stability of Contral Systems

As for the stability of control system,it has been further studied in Ref.,and great achievements have been got.In this paper,the inequlity is used to analyse and study the absolute stability of control system.Some criteria for stability are obtained.The conditions are all based on the parameters of the system itself,thus are easy to apply.The equation of vertical plane movement is given as an example to illustrate the advantages of the obtained achievements.