Aeroengine Composite Maneuver Loading Spectrum Derivation

According to the principle of equal fatigue,creep and thermal impact damage,namely the amounts of main loading cycles,loading duration and the sequence of loading turns are equal in measured loading spectrum and composite loading spectrum,this paper derived an aeroengine’s composite maneuver flight loading spectrum,which provides the basis of formulating accelerated mission test spectrum.Firstly,according to the measured data,the mission profiles are categorized and the flight mission segments are identified.Secondly,the rain flow count loading cycles and the loading duration are obtained by statistical calculation and the damage of the partial loading cycles is analyzed.After averaging the same flight segments by multiplying mission mix rates,then the weighted mean profiles can be obtained,which represent the composite maneuver flight loading spectrum.Finally,the working loading spectra are calculated from altitude velocity characteristic,flight altitude and flight velocity.