FADEC system safety assessment method for aero-engine

Abstract

The invention belongs to the technical field of aero-engines, and discloses an FADEC (Full Authority Digital Electronic Control) system safety assessment method for an aero-engine. The method comprises the steps of obtaining an engine LOTC (Loss of Thrust Control) event caused by the failure of an FADEC system as a failure state of the system; then analyzing system units causing the LOTC event inthe FADEC system, establishing a reliability model between the units of the FADEC system, and solving a minimum cut set in the failure state of the system; then simulating random walk of the system state in a time domain; and finally obtaining an instantaneous LOTC rate and an average LOTC failure frequency of the FADEC system within the task time. The method not only indicates a direction and a way for improving the design and manufacturing process to acquire an airworthiness certificate, but also provides a basis for time-restricted dispatch research of the FADEC system and making of a master minimum equipment list (MMEL).

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and in particular relates to a method for evaluating the safety of an aero-engine FADEC system. Background technique [0002] The safety of modern aero-engine full authority digital electronic control system (FADEC system) affects the safety of the engine and even the whole aircraft. According to the regulations in the "Aero Engine Airworthiness Regulations", the applicant must complete the safety analysis and system safety assessment of the engine control system. Therefore, the safety assessment of the FADEC system is a necessary task for the aeroengine to pass the initial airworthiness certification, and it plays a very important role in improving the design of the FADEC system and verifying the safety level. TLD) research and formulate the master minimum equipment list (MMEL) to provide the basis. [0003] The average safety requirement of the engine control system is measured by the fa...

AI Technical Summary

Problems solved by technology

The limitation of the MA method is: in the Markov process, the next state of the system is only related to the current state and has nothing to do with the history

[0014] Compared with foreign countries, the application of existing safety assessment technology on civil aircraft is relatively lagging behind, and the actual experience is insufficient, and there are some problems in the application process (for example: when applying the fault tree method, sufficient engineering practice experience is required; basic data The shortage of aviation products is also relatively prominent; foreign manufacturers strictly block the technical parameters of aviation products, etc.); there is no improvement in the safety evaluation of the full-authority digital electronic control system of aero-engines and the reliability analysis of the full-authority digital electronic control systems of aero-engines. Perfect (mainly because there is no technology accumulation in this area in China, and there is no mature engineering method, and foreign technology is strictly blocked)

Images