The experiment result showed that sinusoidal tube can effectively inhibit second order harmonic mode, increase first order pressure amplitude and lower down heating block temperature.
在一定加热功率下，正弦管能有效抑制系统产生的二阶谐波，提高一阶压力波动幅值并降低加热块温度。
In this paper, firstly, relations of first two harmonic induced velocities to the lower and same-order harmonic circulations are obtained from the generalized classical vortex theory of the rotor.
本文从旋翼的广义经典涡流理论出发，通过环量对诱导速度的贡献的简化处理，推导出旋翼诱导速度的二阶分布。
The lower the harmonic order, the more rapidly its amplitude increases.
谐波阶次越低，增加速度越快。
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