1) Frequency Non-Stationarity
频率非平稳特性
2) non stationary frequencies
频率非平稳
1.
The distinctive feature and status in quo of artificial ground motions is analyzed in this paper, which set forth a simplified method to describe the non stationary frequencies of earthquake ground motions and statistical laws.
分析了人造地震波的特点与现状 ,给出了地震动频率非平稳特性的简化描述方法与统计规律 ,采用 ARMA模型研究了拟合反应谱的人造地震波合成方法 ,并通过算例对该方法进行了验证。
2.
The zero crossing ratio model is employed to describe the non stationary frequencies.
基于地震动频率非平稳特性的穿零率表示方法 ,进行了三维地震动穿零率参数相关性的统计分析 ,给出了三维相关的参数取值建议。
4) time-frequency non-stationarity
时-频非平稳性
5) non-stationary both in amplitude and frequency
幅值和频率非平稳
1.
On the basis of Priestley s evolutionary power spectra and the typical response spectrum compatible technique for design accelerograms,a new iteration method is developed for generation of random earthquake accelerograms non-stationary both in amplitude and frequency which are compatible with target evolutionary spectrum.
在Priestley渐进谱和常用反应谱拟合技术基础上,提出一种拟合目标渐进谱生成幅值和频率非平稳地震动加速度时程的方法。
2.
Then a new iteration method is developed for generation of random accelerograms non-stationary both in amplitude and frequency which are compatible with target.
提出一种以渐进谱为目标谱的生成幅值和频率非平稳地震加速度时程的迭代方法。
6) smoothing of frequency characteristics
频率特性校平
补充资料：电力负荷电压及频率特性
电力负荷电压及频率特性
voltage and frequency characteristics of load
d一0 rl}一ft一he dlonyo]一P一nl口texing电力负荷电压及频率特性(voltage andfrequeney eharaeteristies of load)见负荷静态特性及负荷动态特性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条