非相似余度飞控计算机

Dissimilar Redundant Flight Control Computer System

从容错的角度介绍了Boeing777和A320的数字飞行控制计算机系统。Boeing777和A320的飞控计算机都采用了非相似的余度技术,能容忍软件和硬件的共态故障,但在每个计算机的功能分配和整个飞控计算机系统的余度结构编排等方面体现了各自的特点。用广义随机Petri网描述了Boeing777余度结构和容错动态过程,并进行了系统的可靠性计算和容错度分析。针对中国“大型飞机”容错飞控系统的设计作了分析和建议。

Flight Control Computer Systems（FCCS） of Boeing 777 and Airbus A320 are described from a fault-tolerant standpoint. The FCCS of the new generation of civil airlines exploits dissimilar redundancy technology both in hardware and software in order to tolerate the common mode failures. But the fault tolerant architec tures and the manner in which function are allocated to each computer of this two types of FCCS are different. By using GSPN, the redundant architecture and dynamic behavior of fault-tolerant system of Boeing 777 are described, and the reliability and fault-tolerant capability are evaluated. Some suggestions are offered for analysis and design of the fault-tolerant flight control system of large aircraft of our country.