The motion at this time scale is clearly dominated by the lightly damped phugoid. 採用這種時間尺度時,運動顯然由小阻尼的沉浮模態所決定。
Express the differences of displacement variation of a mass subjected by a free damped vibration and a forced vibration, separately. 分別敘述一質量受到無阻尼的振動與強制振動時位移變化的不同。