Method for determining reliability of calendar life of airplane structure protection system

Abstract

The invention discloses a method for determining the reliability of the calendar life of an airplane structure protection system. The method includes the following steps that firstly, a relation model of the corrosion damage amount of a structure base body and the corrosion time is established; secondly, a corrosion test of a protection system test piece is conducted, and a calendar safe service life expression of the protection system is established; thirdly, a relation model of the maintenance cost and the reliability is established, and the reliability value enabling the air fleet maintenance cost to be the lowest is solved; fourthly, the limiting conditions of the reliability are determined. The method has the advantages that the method for determining the reliability of the calendar life of the airplane structure protection system lays a foundation for reasonably determining the calendar safe life of the airplane structure protection system and has significance on reducing of the maintenance cost of an airplane and keeping of the combat readiness rate of equipment on the premise that the structural safety of the airplane is ensured.

Description

technical field [0001] The invention relates to a method for determining the calendar life reliability of an aircraft structure protection system, and belongs to the technical field of aircraft structure life determination. Background technique [0002] The life of an aircraft refers to the service life of the aircraft from being put into service to being retired and grounded under normal service conditions. It generally refers to the structural life of the aircraft body. There are two main indicators: one is the fatigue life considering the impact of flight alternating loads on the structure, It is characterized by the number of flight hours or the number of take-offs and landings; the second is the calendar life considering the impact of environmental corrosion on the structure, which is characterized by the service life. [0003] The fatigue life used to determine the life of an aircraft structure does not refer to the life when the aircraft structure is damaged, but a sa...

AI Technical Summary

Problems solved by technology

If the reliability is selected on the low side, more structural protection systems will fail when the calendar safety life of the protection system is reached, resulting in more structural matrix materials being corroded, and more parts need to be repaired during aircraft overhaul , some parts cannot be repaired in time due to the failure of the protection system, and may even lead to structural replacement, which increases the use and maintenance costs of the aircraft; if the reliability is selected too high, the calendar safety life of the protection system determined from this will be short , making structural overhauls more frequent, which not only increases the inspection and maintenance cost of the aircraft, but also affects the combat readiness rate of the aircraft; in addition, the selection of the reliability of the structural protection system’s calendar life must also ensure that the calendar corresponding to the reliability of the structural matrix. No failure occurs during the cycle

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