飞控系统实时仿真算法分析

采用改进的双线性变换方法－临界频率预翘曲方法，对双线性变换方法引起的偏差进行预补偿，从而减小飞控系统的实时仿真误差。以频带较宽的典型环节为例，对系统频率特性进行了分析，同时，将其与双线性变换及四阶龙格－库塔法的计算结果进行了比较。结果表明：该方法能较好地补偿双线性变换所引起的误差，满足飞机飞控系统的实时仿真要求。

Algorism Analysis of the Flight Control System Real Time Simulation

In order to reduce the flight control system real time simulation error, the critical frequency prewarping approximation is adopted to compensate the error that resulted from the bilinear approximation. This paper presents the critical frequency prewarping approximation to analyze the frequency character of the system model with wide frequency band, and compares the method with bilinear approximation and fourth order Runge Kutta method. The result of analysis indicates that the critical frequency prewarping approximation can compensate the simulation error and satisfy the real time simulation of the flight control system.