The characteristics of frequency-spectrum structure and response of ground soils, including soft soils and the frequency of ground micro-tremor, were investigated.
据此研究了地脉动频谱结构特征及场地土(包括软土)对地脉动的频率响应的特性。
Using frequency spectrum analysis of phase function to calculate its auto power spectrum can reflect its frequency structure.
利用相函数的频谱分析求其自功率谱，可以反映它的频率结构。
The feature that structures have the selectivity to the earthquake motions frequency and structure response has the close corresponding relation with instantaneous energy spectrum is pointed out.
指出了结构对地震动的频率具有选择性，结构的响应与瞬时能量谱之间具有密切的对应关系。
At first, this paper described the basic structure, working principle, sources of spurious signals and characteristics of output spectrum, of direct digital frequency synthesizer (DDS).
首先分析直接数字频率合成器(DDS)的基本结构、工作原理、杂散来源、输出频谱特性。
Intubation structure can improve the acoustic performance of mufflers and widen the frequency range of mufflers, but its length must be designed according to the exhaust spectrum.
内插管结构能改善消声器的声学性能，拓宽消声频率范围，但设计它的具体长度需要根据排气频谱来选择。
Requirements for the characteristics of frequency response of the noise transducer are put forward so as to analyze the actual spectrum structure of noise.
为了客观地反应噪声信号的频谱结构，对井下噪声换能器的频谱响应特性提出了一定的要求。
Because the structure vibrates at some modal, a vibration peak value will appear at its noise frequency spectrum.
这是因为结构以某一阶模态振动时，将在其辐射噪声频谱上出现一个峰值。
A method of local spectrum analysis is presented to process a bearing vibration signal based on the vibration frequency structure of a deep groove ball bearing.
在深沟球轴承振动频谱结构分析基础上，引入了振动频谱的局部分析方法。
Analyze and compare a variety of technologies of frequency synthesis, analyze the principle, structure, spectrum and characteristics of direct digital synthesis.
分析比较了各种频率合成技术的优缺点，重点分析了直接数字式频率合成器的原理、结构、频谱以及特点。
Venation wave spectrum analysis finds out shape-structure change of mid-frequency signal fluctuation.
脉络波谱图分析查明了中范围（频率）信号波动的形态结构变化。
The signal, after the Angle modulation, would change in its spectral structure. And the analysis on its frequency spectrum is an important and necessary step for signal processing.
信号经过角度调制后，频谱结构将发生变化，频谱分析是处理信号的重要步骤和必要的保证。
Based on the numerical simulation method, frequency spectrum analysis and structure analysis were conducted for the three dimensional unsteady flow inside the compressor rotor.
通过数值模拟，对一个低压压气机转子的非定常流场进行结构分析和频谱分析。
Based on the numerical simulation method, frequency spectrum analysis and structure analysis were conducted for the three dimensional unsteady flow inside the compressor rotor.
通过数值模拟，对一个低压压气机转子的非定常流场进行结构分析和频谱分析。
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