n. luffing
misc. pitching motion
在一些机械设备中，受货位常常随俯仰机构作俯仰运动。
In some mechanical equipments, the receiving freight position moves following pitching part.
为了减少俯仰运动，后悬架应该比前悬架有较高的弹簧刚度。
We have an empirical knowledge that the rear suspension should have a higher spring rate than front one, in order to reduce pitching motion.
在此情况下，系统的输入是紊流大气，它使飞行器产生随机俯仰运动。
The system input in this case is turbulent air which produces random pitching motion of the vehicle.
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