Method for optimizing AFDX (Avionics Full Duplex Switched Ethernet) network path under consideration of risk balance

Abstract

The invention discloses a method for optimizing an AFDX (Avionics Full Duplex Switched Ethernet) network path under the consideration of risk balance. The method comprises the following steps: calculating the risk degree of an end system in an AFDX network; calculating the risk degrees of VLs (Virtual Links) according to the risk degree of the end system; calculating the risk degree of each physical link according to the risk degrees of all VLs borne on the physical link; calculating a risk degree standard deviation according to the risk degrees of all physical links; building an effective physical link set of each VL; and performing risk balance on effective physical links by a particle swarm algorithm according to the risk degree standard deviation obtained in the step IV and the effective physical link sets of the VLs obtained in the step V. The method has the advantages that the problem of risk balance is considered in the path optimization process of the AFDX network; the situation that a single physical link bears a plurality of VLs having great influences on airplane safety is reduced; and the airplane safety is enhanced. The particle swarm algorithm is introduced into the path optimization process, so that an optimized path satisfying a risk balance condition can be found, thereby reducing the risk standard deviation among the physical links.

Description

technical field [0001] The invention belongs to the technical field of avionics system network optimization design, in particular to an AFDX network path optimization method considering risk balance. Background technique [0002] Avionics Full Duplex Switched Ethernet (AFDX) is a network protocol standard defined by ARINC 664Part7 for the interconnection between avionics subsystems. The AFDX network is developed on the basis of a mature commercial network protocol - IEEE802.3 Ethernet. Compared with previous avionics networks, such as ARINC429, MIL-STD-1553B, etc., it has inherently high bandwidth and good scalability advantages, but also has the characteristics of good determinism and high real-time performance. [0003] "Design and real-time performance analysis of time-triggered AFDX network" published in "Journal of Beijing University of Aeronautics and Astronautics" in June 2013, Volume 39, Issue 6, discloses a method such as figure 1 As shown in the traditional AFDX ...

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Problems solved by technology

[0004] The airborne network is called the nervous system of the aircraft. As an information exchange channel for airborne equipment, it is directly related to the flight safety of the aircraft. However, the existing AFDX technology mainly focuses on issues such as link bandwidth allocation, real-time performance, and reliability. However, less attention has been paid to the risk of each physical link, so that there will be a situation where a single physical link carries multiple VLs that have a significant impact on aircraft safety, resulting in risk concentration, which affects the safety of the entire aircraft

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