The main causes resulting in poor speed smoothness of the HVD set under open-looped condition are the insufficient linearity of pressure control and the insufficient pressure stability of relief valve used for speed regulating purpose of the HVD set,and usually worked under condition of small flow rate and low oil pressure.

By introducing an additional variable in the framework of the Finite Increment Calculus(FIC) theory,a pressure stabilized fractional step algorithm is developed in this paper with enhanced pressure stability in comparison with the classic one.

The paper analyzed and investigated the tendencies character in the suppressing process and pressure stability of the hydraulic control system of the brick press.

Analyzes the main factors that influence the pressure stability in side supply airconditioning system, such as pressure control mode, design of static pressure box, testing posi-tion of supply air pressure sensor and the set of pressure value of static pressure box, etc.

Based on eigenvalue structure analysis(ESA) method,the effect of SSSC and its model on power system voltage stability is studied under some conditions,such as proportionally loading at all nodes,or loading only at the most sensitive node to the voltage.

It plots typical curve of bottomhole transient pressure con.