Fleet and single airplane combined fatigue lifetime extension method

Abstract

The invention discloses a fleet and single airplane combined fatigue lifetime extension method. The method comprises the steps that testing results and field data are analyzed by analyzing a known design to determine lifetime extension critical parts; damage control standards and repairing measures are formulated according to the lifetime extension critical parts; an airplane of which the life expectancy is reached is selected as a fatigue tester, repairing including the repairing measures of the lifetime extension critical parts is conducted on the fatigue tester, and full-scale fatigue testing of the repaired fatigue tester is completed to verify the repairing measures and the lifetime extension standards; fatigue and damage tolerance analysis is conducted on non lifetime extension critical parts to evaluate lifetime extension demands. The method has the advantages that a concept of lifetime extension critical parts is provided, and by aiming at the lifetime extension critical partsand the non lifetime extension critical parts, different measures and demands are adopted, so that lifetime extension is easy to implement; by means of a unified repairing scheme formulated accordingto a fleet and considering damage difference of a single airplane, single airplane damage dispersion is eliminated or reduced and controlled to greatly reduce time, cost and risks of fatigue testing.

Description

technical field [0001] The present invention relates to the technical field of fatigue, in particular to the technical field of aircraft fatigue life extension. Background technique [0002] For aircraft life extension, there are mainly single aircraft life extension methods and fleet life extension methods. The single-machine life extension method takes a single machine as the object, and requires the complete load history data of the single machine's service life to determine the actual service life, and then determine the life-extending life. The fleet life extension method takes the fleet as the object, considers the flight load, operating environment, damage, and repair status dispersion of a single aircraft, determines and verifies the life extension repair plan and life index that meet certain reliability indicators, and uses the same repair plan for each aircraft in the fleet. Control according to the same life index. [0003] However, for some aging aircraft that ...

AI Technical Summary

Problems solved by technology

[0004] 1) The aircraft was designed earlier, without considering the structural inspectability, and the structure cannot be dismantled and difficult to inspect;

[0005] 2) The aircraft lacks flight parameter recording equipment, so it is impossible to determine the load history of a single aircraft;

[0006] 3) The range of use of the fleet is wide, the environment and load vary greatly, and the status of each stand-alone machine varies greatly;

[0007] 4) During the use process, the flight training program of the aircraft was adjusted, the use conditions were changeable, and after several overhauls, the state of the aircraft was quite different from the design expectation

Prolonging the life of the machine group has long cycle and high cost. At the same time, it faces inconclusive technical problems such as the selection of fatigue testing machine, dispersion coefficient, conversion of field service life and test life, and the huge risk of fatigue test of the whole machine.