短周期モードとフゴイドモードの相対関係がピッチ姿勢操縦性に及ぼす影響

概要

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The longitudinal motion of an aircraft is influenced by two oscillatory motion modes which are called the short-period mode and the phugoid mode. The pitch attitude handling qualities of a STOL (short takeoff and landing) airplane degrades as its flight speed slows. The main cause of this degradation is considered to be that the natural frequencies of the two modes approach each other. However, we have studied the effects of modal parameters using a flight simulator, including the initial amplitude ratio and difference in the initial phase angles, of the short-period and phugoid components in the pitch attitude response to elevator step input. The results show that the difference in the initial phase angles plays the most important role in a human pilot's pitch control and the effect of the proximity of the two natural frequencies is small.