因而对螺旋桨离散谱噪声进行预报控制至关重要。
本文对正压模式中慢波的离散谱及其特征函数作了数值计算。
In this paper discrete spectra and their characteristic functions of slow waves in barotropic models are calculated.
结果表明该P PM信号的功率谱(PSD)由连续谱和离散谱组成。
Results show that the PSD of the generalized PPM signal is composed of both discrete and...
文中得到几个振动性准则和离散谱准则，并将这些结果应用到常微分方程。
Some oscillatory criteria and discrete spectrum criteria are given, and we can apply them to the ordinary differential equations.
本文对两个连续谱问题(正、负k N谱问题)及一个离散谱问题进行了研究。
Two KN spectral problems (positive, negative) and a discrete spectral problem are investigated in this thesis.
蜂窝密封、梳齿密封和光滑密封的对比实验表明，密封间隙气流压力脉动谱图为离散谱。
The contrast tests of smooth seals, labyrinth and honeycomb seals have demonstrated the seal gas clearance pulsation spectrum is a discrete one.
但当在经过很长时段之后，由于和离散谱部分相对应的扰动占主要地位，WKB方法所得结论可能不再成立。
However, after a very long time the component associated with the discrete spectra becomes dominant, and the results obtained by WKB method might no longer be valid.
我们对它的声场和频谱作了详细的实验测量，由于采用外差分析技术，冲击噪声的离散谱和宽带谱可同时记录。
Sound field and spectra thereof were investigated experimentally by utilizing the heterodyne analysis technique, so that both the screech and the wide-band noise can be recorded and studied.
我们对它的声场和频谱作了详细的实验测量，由于采用外差分析技术，冲击噪声的离散谱和宽带谱可同时记录。
Sound field and spectra thereof were investigated experimentally by utilizing the heterodyne analysis technique, so that both the screech and the wide-band noise can be recorded and studied.
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