Research on singular fault handling strategies of redundant signals in flight control systems

Abstract

The symmetrical design of the aircraft's wings and control surfaces determines the system framework in which the sensors,computers,and actuators of the flight control system are symmetrically distributed and installed on the aircraft,and the even number n-redundant architectural design is adopted. In the practical engineering,the balanced division of labor in the productive relations of redundant parts and the differences in design and manufacturing between different manufacturers would inevitably appear the case of two singular faults such as: 'two-party opposition' even separation uncertain fault and 'mutual disapproval' uncertain fault. In this paper,the basic theories such as median voting,variable memory and redundancy reconstruction are put forward,and the criterion of extreme signal high probability fault is given. It provides an effective voting monitoring scheme for four redundancy signals "2∶2 uncertain faults,1∶1∶1 multiple faults",three redundancy signals 1∶1∶1 multiple faults and two redundancy signals 1∶1 faults.

Keywords

• fault monitoring
• median voting
• 2∶2 uncertain fault
• 1∶1∶1∶1 multiple fault
• variation memory
• redundancy reconstruction