7级大地震数据进行处理，获得地球自由振荡的功率谱密度。
7 are processed, the PSD of Earth free oscillation is obtained.
在导翼中自由振荡的球有利于全流道流动，最大限度减小湍流和振荡。
Free oscillation of ball in guide ribs facilitates full port flow with minimum turbulence and chatter.
用地球的自由振荡研究地球内部结构、速度间断面、密度分布等具有射线理论不可替代的优点。
The earth free oscillation can be used to constrain structure of the earth interior, including velocity, discontinuity as well as density distribution.
还提出了采用单自由度线性无阻尼自由振荡系统作为测定传感器谐波失真度的一个高纯度正弦波激振源。
It is also recommended in this paper that a linear nondamping free vibration system of a single freedom degree can provide a stimulant source of sine wave with high purti…
利用天然地震波测量Q值的主要方法有：利用地球自由振荡资料、利用体波、利用面波和利用尾波来研究Q值。
The major methods of measuring Q-value by the natural earthquakes are the ones of using the data of free vibration of earth, body wave, surface wave and coda.
本文用一维激光热熔条件计算了与时间效应有关及无关的热应力值，从理论上证明自由振荡激光引爆机理是热起爆；
Through the calculation of thermal stress values, it has been affirmed that free oscillation laser ignition of the explosive is heating ignition.
采用自由振荡法数值模拟了平头、钝头外形的超声速俯仰振荡时间历程，并应用奇异分解线性最小二乘法辨识稳定性导数，得到动导数随马赫数和攻角非线性变化的规律。
The dynamic derivatives conception is used as the index for the vehicle stability, but it is looked as the function of angle of attack and Mach number to induced nonlinear characteristics.
采用自由振荡法数值模拟了平头、钝头外形的超声速俯仰振荡时间历程，并应用奇异分解线性最小二乘法辨识稳定性导数，得到动导数随马赫数和攻角非线性变化的规律。
The dynamic derivatives conception is used as the index for the vehicle stability, but it is looked as the function of angle of attack and Mach number to induced nonlinear characteristics.
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