5 by 5 Spectrum Development Method for Transport Aircraft Based on Beetle Antenna Search Algorithm and Interior Point Method
The development of load spectrum is of significant importance for fatigue analysis and testing of transport aircraft serving as input parameters.In response to the demand for the development of a load spectrum for transportation aircraft,a method for developing a 5 by 5 spectrum based on the beetle antenna search algorithm and the interior point method was proposed.Firstly,the mission profile of the aircraft was determined,and the overload cumulative exceedance curve was obtained through processing and statistical analysis on the aircraft's measured data.According to the lognormal distribution criterion of extreme loads,a 5 by 5 spectrum solution method based on the coupling of the beetle antenna search algorithm and the interior point method was used to iterate and select the number of flight types and load level ratios.A load spectrum shape similarity index was proposed according to the load spectrum shape similarity criterion,and the beetle antenna search algorithm was used to calculate the number of occurrences of each level of load in each type of flight in the 5 by 5 spectrum,and finally formed the 5 by 5 spectrum for each task segment.Finally,an example was provided to illustrate the method of 5 by 5 spectrum development in detail.This study has achieved the expedited and high-quality development of 5×5 spectrum for transport aircraft.
transport aircraft5 by 5 spectrumTWIST spectrumextreme logarithmic normal distribution criterionload spectrum shape similarity criterion
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