fmincon()

进行寻优

此过程是一个仿真和优化反复交替的过

程。图

为优化后压力的阶跃响应仿真曲线

对比优化前可

以看出经优化压力响应速度提高、

超调量减小。

图

　优化后压力的阶跃响应仿真曲线

5 　结论

功率键合图建模法简明易懂、

层次清楚

而且能够包容

非线性

使得到的状态方程能够较好地反映液压元件及系统

的动态特性

;

在

SIMULINK

环境下直接利用状态方程对液压

系统的动态特性进行模块化仿真具有方便、

直观、

可靠性高

的优点

;

将

SIMULINK

和

MATLAB

所提供的优化指令结合起

来

可以灵活、

高效的进行系统动态特性的优化。

参考文献

[1 ]

　上海第二工业大学液压教研室

液压传动与控制

[ M] .

上海

上

海科学技术出版社

,1990

[ 2 ]

[

澳大利亚

] P

德兰斯菲尔德

液压控制系统的设计与动态分析

[M] .

北京

科学出版社

1987

[3 ]

　刘能宏

田树军

液压系统动态特性数字仿真

[ M] .

大连理工大

学出版社

,1993

[ 4 ]

　张志勇

精通

MATLAB5. 3[M] .

北京航空航天大学出版社

,2000

[5 ]

　王沫然

. Simulink4

建模及动态仿真

[M] .

北京

电子工业出版社

2002

作者简介

李　锋

(1966

—

) ,

男

(

汉族

) ,

河北吴桥人

博士

研

究方向

武器系统仿真。

马长林

(1977 - ) ,

男

(

汉族

) ,

河南邓州人

硕士研究

生

研究方向

武器系统仿真。

Research on Simulation and Optimization for Dyna mical Characteristics

of Hydraulic System Based on SIMUL INK

L I Feng ,MA Chang - ling

(the Second Artillery Engineering Institute ,Xi

’

an Shanxi 710025 ,China)

ABSTRACT :A dynamic model of pressure adjusting system of the direct relief valve is developed by means of power bond graph , the method

of modeling and simulation utilizing the state equation directly based on SIMULINK is discussed , and the optimization of dynamical characteris

tics is also studied using SIMULINK and the optimization toolbox.

KEYWORDS :Hydraulic System ;State Equation ;Simulation ;Optimization

(

上接第

109

页

)

Adaptive Cascade Control Based Multi - model for

the Superheated Stea m Temperature

ZHAO Wen - jie , NIU Yu - guang , L IU Ji - zhen

(Dept. of Power Engineering , North China Electric Power University ,Baoding Hebei 071003 , China)

ABSTRACT :The superheated steam temperature is a big - inertial and big - lagged process ; moreover , its dynamic behavior varies widely on

the different operating conditions. In this paper , a new adaptive cascade control strategy based multi - model is presented. According to the

operating conditions over which the control system is expected to operate , a set of linear models is developed and the controllers associated with

each model are designed. By means of choosing a appropriate pair of controllers (main and sub controllers) at the different load operating

scope , the multi - pair controllers can satisfy the control performance specifications over the entire operating conditions of the plant. The main

loop adopts IMC (internal model control) because of its straightforward handling of time - delay , and the sub loop adopts conventional P con

trol. The simulated example , a supercritical once - through 600MW boiler

’

s superheated temperature control system , shows that the proposed

control system has better adaptive capability over the entire operating conditions and it is minimal in overshoot , fast in response and robust.

KEYWORDS :Superheated steam temperature ; Multiple models ; Internal model control ; Cascade control

—