Integrated Modular Avionics Fault Propagation Model Establishment and Reliability Allocation

One of the core landmark technologies of large aircraft is Integrated Modular Avionics (IMA). The IMA system integrates physical synthesis and functions to reduce aircraft weight, improve performance, and reduce life cycle costs. It is of great significance. But at the same time, a series of reliability and safety issues have also arisen as a result of these sharing and integration. Because traditional reliability and safety analysis methods are difficult to analyze the complex effects of shared element failures in IMA systems, based on the analysis of the IMA system structure and its failure modes, this study proposes that for shared input failures and hardware failures. Based on the IMA fault propagation model, through the calculation of the reachability matrix and the integrated analysis of the model topology and non-topological factors, the fault propagation characteristics of the IMA system due to the failure of different shared elements are obtained. Based on this, the distribution of the reliability of the sensor is explored and proposed. Preliminary thinking on reliability distribution of sensors based on safety importance.