Reconsidering the process of laboratory simulation conditions definition of the vibration regime in the captive straight flight on an airborne store

摘要

Several aspects are discussed of the laboratory condition definitionrnprocess of the vibration regime in captive straight flight on an airbornernstore. The need is emphasized of reconsidering the statistics in thernevaluation and to use the average PSD plus three standard deviationsrninstead of the average PSD. The results of this change in the RMS versusrndynamic pressure model are presented. The incorrectness is stressed ofrnbasing accelerated testing planning on the RMS values. The need isrnconsidered of changing the methodology to a combination of load cyclerncounting with the Miner Law, in the evaluation of the laboratoryrnaccumulated damage as an equivalent of the field accumulated damage.rnThe advantages of PSD evaluation by the Parametric ModelingrnMethodology as compared to the FFT Methodology are elucidated. It canrnbe seen that larger calculation errors of the Fourier Methodology arerndetrimental to the testing conditions definition.