Aircraft system safety demand optimal allocation method

Abstract

The invention discloses an aircraft system safety demand optimal distribution method, and the method comprises the steps: determining a system top-layer safety demand according to function hazard evaluation, and determining a function failure set which causes a system top-layer failure state according to fault tree analysis, and respectively describing the membership of the equipment / function relative to the function failure set and the membership of the function failure set relative to the failure state by using different relation matrixes; deducing constraint conditions of safety demand distribution according to a development assurance level distribution principle and probability demands of a top failure state; establishing an optimization model of aircraft system safety demand distribution by taking the equipment / function development assurance level and the failure probability as decision variables and taking the minimum system development cost as an optimization target; and solving an optimal solution of the model by using a particle swarm algorithm. On the premise of ensuring that the aircraft system integration scheme meets the safety requirement, the development cost of the aircraft can be reduced, and global optimization of the safety and economy of the aircraft is achieved.

Description

technical field [0001] The invention specifically relates to the field of system safety analysis in civil aircraft airworthiness certification, and specifically relates to a distribution and optimization method of aircraft system safety requirements. Background technique [0002] Safety analysis is not only the main means to carry out safety design and improve the safety of aircraft systems in the process of aircraft development, but also an important method to carry out compliance verification and airworthiness certification for civil aircraft systems in accordance with airworthiness standards in the certification process. In the development of civil aircraft, system safety analysis must be carried out from top to bottom, and the top-level safety requirements of the aircraft are assigned to the system, subsystems, and equipment / functions (Item / Function, I / F) at the bottom in order to determine The security requirements of the underlying I / F ensure the traceability and contr...

AI Technical Summary

Problems solved by technology

[0005] 1) The allocation process is too dependent on the experience of the designers, and with the increasing complexity of modern aircraft systems, the efficiency of the current allocation method is too low;

[0006] 2) The current security allocation is carried out separately for DAL or failure probability, which cannot ensure that the assigned values ​​of DAL and failure probability meet both qualitative and quantitative requirements for top-level security;

[0007] 3) The current security allocation scheme can only meet the top-level security requirements of the aircraft, without considering the impact of system development costs on security allocation, and cannot achieve the optimization of aircraft development costs

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