Calculation and analysis of the scatter of load spectrum damage based on Fokker F27 airplanes

To assess the reliability life of a fleet, the scatter of the load spectrum must be considered. In this paper, 56 individual load spectra are compiled based on the acceleration-exceedance curves corresponding to a fleet of Fokker F27. With the application of the SWT formula and linear accumulative damage rule, the flight damage and the ground-air-ground (GAG) damage, as well as the total damage per flight have been analyzed. Next, the probabilistic coordinate regression is conducted to examine the distribution parameters of the three types of the damage of load spectra respectively. The goodness fit shows that the flight damage follows the Weibull distribution whilst the GAG damage follows the lognormal distribution, and the total damage comprehensively including flight damage and GAG damage follows a lognormal distribution. In addition, the lognormal standard deviation of the total damage is 0.0737.