... 纵摇固有周期：natural period of pitching 纵摇幅度：amplitude of pitch 纵摇浮力：pitched buoyancy ...
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In an amplitude grating system of small grid pitch, the diffractive light is the main cause to deteriorate the contrast and sinusoidal property of Moiré signals.
在国内外普遍使用的细栅距幅光栅叠栅条纹系统中，衍射效应是很明显的，这是造成叠栅条纹信号的衬比（度）和正弦性不好的主要原因。
The average effective pitch damping increases with increasing Angle of oscillation amplitude and decreases with increasing Mach number.
角振幅增大会使返回舱的平均俯仰阻尼增加，马赫数增大使俯仰阻尼降低。
The nonlinear damping and stiffness of a ship motion result in the coupling between rolling and pitch in big amplitude.
舰船运动的阻尼和刚度非线性，导致舰船大幅运动时横摇和纵摇之间的耦合。
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