The Architecture Design And Reliability Assessment For Dissimilar Cross Monitoring Double Redundant Flight Control Computer

On the flight control system, the flight control computer is the core component of the system, which requires high reliability. In order to meet this requirement, the redundancy with combination of hardware and software is usually adopted.This paper presents a dissimilar cross monitoring double redundant flight control computer architecture design. Through analyzes the functional requirements and reliability of the system, the redundant configuration of flight control computer is confirmed. In order to meet the reliability requirements and tolerance levels of flight control system, cross monitoring heterogeneous system structure is adopted, which includes 2 channels, every channel with 2 lanes. One of the control lane, the other is monitor lane. If the control lane fails, the output is cut off. In order to reduce Homomorphism faults, the dissimilar redundant technology is used.This paper introduced the function module, operation mode, system structure and the key technology of design, including the technology of synchronization, CCDL, redundancy management and the software design, etc. This paper discusses the system failure mode, and on-line monitoring, fault diagnosis and recovery of the system based on the redundant technology of combination of hardware and software. The paper uses FTA method and Analytic Network Process for qualitative analysis of the system's reliability. Through the analysis on the system state, Markov reliability model is established, using the method of Probability state diagram, the numerical computation is adopted.