A40 低速域における航空機の短周期モードとフゴイドモードの関係(M-OS9-2 ビークルの運動と制御II,M-OS9 ビークルの運動と制御,「海を越え,国を越え,世代を超えて!」)

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  • A40 Relations Between Short-period Mode and Phugoid Mode in Lower Speed Flight of Airplane

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The longitudinal flying qualities of airplanes is going to worse in lower airspeed region, as shown in the criteria for short-period mode in MIL-F-8785C. However, Background Information and User Guide for MIL-F-8785B does not give the detailed explanation on this degradation. Our study pays attention to the deviation in lower airspeed region from short-period mode approximation, which is valid in higher airspeed region. The main parameter of this deviation is Phugoid-mode natural angular frequency ω_<n ph>, which cannot be neglected in lower airspeed region because its oscillation period is going to be shorter in that region. Also, we investigated the relations between short-period mode natural angular frequency ω_<n ph>, and ω_<n ph>. The results of flight simulator experiment show that the flying qualities evaluation based on Short-period mode approximation is improper in lower airspeed region and then upper limit of ω_<n ph> should be added into the criteria for longitudinal flying qualities.

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