固有周期

因此，在浅水FPSO的设计和研究中，关于运动固有周期参数的给定必须考虑水深的影响。

Therefore , in the design and research of FPSO in shallow water , the effects of the shallow water depth should be taken into account for determining the natural period of motions .

浅水浮式生产储油轮运动固有周期特性

The Natural Period of Motions of FPSO in Shallow Water

认为水井含水层系统与水位观测系统对固体潮与地震波的响应，主要取决于这两个系统的固有周期。

It is considered that the above-mentioned response mainly depends on the intrinsic periods of these two systems .

但是由于三角函数的固有周期性，攻击者在已知密文的条件下很容易解出明文，使得攻击容易得逞。

But any attacker easily gets the plaintext message given known ciphertext for the inherent periodic property of trigonometric function .

固有周期在最低的三个大气标高高度上多半会受到平均风的影响。

The eigenperiods , for the most part , are influenced by the mean winds in the lowest three scale heights .

推导并给出了轴向固有周期下线性加载动力放大系数随线性加载时间的变化关系。

According to axially natural period , the relation of the dynamic magnification factor vs the linearly loading time under linearly loading is deduced and presented .

按单自由度刚体弹簧体系求得了气浮结构升沉运动的固有周期，并对气浮结构的动态特性进行了分析。

Simplifying the air floated structure as a single freedom rigid body and spring system , the inherent period of heaving and some kinetic properties are presented .

结果表明，井孔的固有周期是影响水位记震能力大小的首要条件。

The result shows that the inherent period of well hole is the first important condition for influencing the ability of recording seismic wave of groundwater level in well .

结果表明：拱坝的固有周期不仅随坝高变化，而且因河谷而异，但与坝高均成直线变化。

Results show that the natural period of the arch dam depends not only on the height of the dam but also on the shape of the cross-canyon profile .

水位仪及水井含水层的频率特性与其参数间的定量关系认为水井含水层系统与水位观测系统对固体潮与地震波的响应，主要取决于这两个系统的固有周期。

ABOUT FREQUENCY CHARACTERISTICS AND QUANTITATIVE RELATIONS AMONG PARAMETERS OBTAINED FROM THE LEVEL DETECTOR AND WATER BEARING BED It is considered that the above-mentioned response mainly depends on the intrinsic periods of these two systems .

采用场地等效固有周期（以下简称场地固有周期）代替常用的场地分类形式进行统计，在一定程度上克服了场地分类标准不明确的缺点。

In the statistical process the equivalent inherent period of field is used to substitute the conventional field classification , so as to overcome the shortcomings of field classification without an obvious criterion to a certain degree .

为简化计算，一般当冲击力作用时间远小于隔离系统的固有周期时，我们可把冲击理想化为速度阶跃。

In general to simplify the calculation of shock response shock motion is often idealized to a velocity step function when the duration of the shock is far less than the inherent period of shock isolation system .

研究结果表明，井-含水层系统对前驱波的响应能力大小与含水层的固有周期存在一定关系，即固有周期越大，记录前驱波的能力越强；

The results indicate that responding ability of well-aquifer system to precursors is related to inherent period of well-aquifer , that is to say , the greater the inherent period is , the stronger the ability of recording precursor is .

半封闭海湾固有振动周期的数值计算

Computations of natural periods of a half-closed Bay using a numerical model

通过鲁04井的频率特性试验，求出了该井含水层系统的频率特性参数，固有振动周期为40.59s，阻尼系数为0.0362s~（-1）。

The parameters of characteristic frequency of the aquifer system in the well Lu-04 have been calculated for some well frequency under the test .

然而一般的结构辅助设计软件均基于某种商业目的且遵循固有生存周期&这直接导致了软件购置费用高昂、缺乏适应变化的弹性。

However , in general all computer aided design software are based on certain business purpose and follow their proper existence period , which directly cause the selling price extremely high and lack of flexibility of adapting the variety .

由于房地产投资固有的周期长、投资额大、影响因素复杂等特性，房地产投资面临的风险因素也特别复杂，风险因素引起的后果也特别严重。

These unstable factors play a key role in the real estate investment . The real estate investment is facing the complicated risky factors which can cause severe consequence , because of the characteristic of the real estate investment-long period large amount and complex factors .

用瞬态碰撞激震测定牙固有振动半周期T／2和减幅系数η。

Measurements of tooth natural vibration half cycle T / 2 and ratio of amplitude attenuation η was done according to tooth vibration excited by instantaneous impact .

混沌信号所固有的非周期，宽频谱和对初始值非常敏感等突出特征，使得其在信息加密中有着良好的应用前景。

Because of chaotic signal inherent in non-cycle , wide spectrum and sensitivity to the initial values and so on , it makes chaos has good application prospects in the information encryption .

在其指导下，选择了作用力的作用时间和波形：该作用力的作用时间T应为机械结构一阶固有频率对应周期的2倍，且为关于T/2奇对称的单周期波形。

It is determined that the optimum driving force should be odd symmetric to its half moment T / 2 and with a time duration two times of the cycle of the first mode .

模态分析的结果表明油箱的若干个固有振动模态被周期性冲击所激发，因其具有较大的声辐射表面而在某些固有频率处产生显著的噪声分量。

The results obtained by modal analysis show that some modal shapes of the oil tank are excited by periodic shock and generate considerable noise components at several natural frequencies due to its big sound emission surface .

通过理论数据的分析，如固有角频率、固有周期、噪声和实验频率的选择等等，用现有测量手段和现有仪器精准度，可以完全达到通信的目的。

Through analysis of the theoretical data , Such as the intrinsic angular frequency , natural cycles , noise and experimental frequency selection , etc. , existing precision measuring instruments and equipment can fully meet our needs .