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damping ratios
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  阻尼比
     Effect of grading of aggregate, rubber and interface treatment on the damping peroperty of epoxy resin concrete (EPC) against vibration were studied by a self-designed test device and the damping ratios of EPC obtained are 0.02272 and 0.02188 corresponding dynamic Young's modulus are 25.16 and 26.70 respectively.
     本文采用自行设计组装的测试系统研究了集料级配、橡胶和界面处理对环氧树脂混凝土(EPC)减振阻尼性能的影响. 结果得到的EPC,其阻尼比为0.02272和0.02188,相应的动弹性模量分别为25.16和26.70.
短句来源
     For vehicles with leaf spring suspensions, the dampers’ damping ratios for jounce travel should be 0.1~0.2 and that for rebound travel be 0.2~0.3.
     对于采用板簧悬架的车辆 ,减振器在压缩行程和复原行程的阻尼比范围应分别为 0 .1~ 0 .2和0 .2~ 0 .3 .
短句来源
     The numerical results for the relationship of the loss tangent of material and the damping ratios of structural modes are given for a shear-type reinforced concrete frame with ten stories.
     其次,本文分析了材料阻尼对结构阻尼比影响,得到了材料损耗因子与结构模态阻尼比间的关系,并通过10层钢筋混凝土剪切型框架结构进一步给出了具体的数值结果。
短句来源
     The response spectra in current chinese seismic design code is expounded and an updating formula of the horizontal seismic coefficient for different damping ratios is discussed.
     然后,考虑了阻尼比对结构地震反应谱的影响,分析了我国现行建筑抗震设计规范反应谱,并讨论了不同阻尼比对水平地震影响系数的修正公式。
短句来源
     Modal damping ratio matrix offers a partial physical interpretation of measured modal damping ratios for non-proportionally damped systems.
     系统阻尼比矩阵和模态阻尼比矩阵对由实验得出的实模态阻尼系统的阻尼比提供了一种直观的表达,在复模态情况下,模态阻尼比矩阵和实验测定值在定性的意义上也是完全一致的.
短句来源
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  阻尼
     Effect of grading of aggregate, rubber and interface treatment on the damping peroperty of epoxy resin concrete (EPC) against vibration were studied by a self-designed test device and the damping ratios of EPC obtained are 0.02272 and 0.02188 corresponding dynamic Young's modulus are 25.16 and 26.70 respectively.
     本文采用自行设计组装的测试系统研究了集料级配、橡胶和界面处理对环氧树脂混凝土(EPC)减振阻尼性能的影响. 结果得到的EPC,其阻尼比为0.02272和0.02188,相应的动弹性模量分别为25.16和26.70.
短句来源
     For vehicles with leaf spring suspensions, the dampers’ damping ratios for jounce travel should be 0.1~0.2 and that for rebound travel be 0.2~0.3.
     对于采用板簧悬架的车辆 ,减振器在压缩行程和复原行程的阻尼比范围应分别为 0 .1~ 0 .2和0 .2~ 0 .3 .
短句来源
     The numerical results for the relationship of the loss tangent of material and the damping ratios of structural modes are given for a shear-type reinforced concrete frame with ten stories.
     其次,本文分析了材料阻尼对结构阻尼比影响,得到了材料损耗因子与结构模态阻尼比间的关系,并通过10层钢筋混凝土剪切型框架结构进一步给出了具体的数值结果。
短句来源
     The response spectra in current chinese seismic design code is expounded and an updating formula of the horizontal seismic coefficient for different damping ratios is discussed.
     然后,考虑了阻尼比对结构地震反应谱的影响,分析了我国现行建筑抗震设计规范反应谱,并讨论了不同阻尼比对水平地震影响系数的修正公式。
短句来源
     Modal damping ratio matrix offers a partial physical interpretation of measured modal damping ratios for non-proportionally damped systems.
     系统阻尼比矩阵和模态阻尼比矩阵对由实验得出的实模态阻尼系统的阻尼比提供了一种直观的表达,在复模态情况下,模态阻尼比矩阵和实验测定值在定性的意义上也是完全一致的.
短句来源
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  “damping ratios”译为未确定词的双语例句
     Modified Hardin-Drnevich models and logistic models are used to describe the trend of the normalized modulus reduction curves and damping ratios vs. shear strain curves in the paper.
     采用修正了的Hard in-D rnevich模型和对数模型分别对G/Gm ax~γ曲线和λ~γ曲线进行拟合,给出了三类粉质土的归一化动力变形G/Gm ax~γ/γr关系曲线,对模型中有关参数的影响因素做了初步的探讨。
短句来源
     AN ANALYSIS OF RESPONSE SPECTRUM UNDER DAMPING RATIOS
     不同阻尼情况下的反应谱分析
短句来源
     Measurement and Analysis of Modal Damping Ratios on Tall Steel Building
     高层建筑钢结构振动阻尼比测试与分析
短句来源
     EQUIVALENT MODAL DAMPING RATIOS OF VIBRATION IN COMPOSITE STRUCTURES
     组合结构振动的等效阻尼比
短句来源
     2 The changes of higher order natural frequencies and damping ratios under the influence of residual stress are larger than those of lower oder natural frequencies and the higher the order number is the larger the absolute changes of natural frequenc and damping ratio are etc.
     (2)高阶频率受残余应力影响比低阶频率的大;
短句来源
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  damping ratios
Damage-induced changes in natural frequencies, damping ratios and mode shapes can be detected using experimental modal analysis (EMA), which has recently enjoyed intense research for application in structural health monitoring.
      
Vibration analysis reveals that damage can be correlated with changes in identified modal damping ratios.
      
Natural frequencies and damping ratios of a structure, with piezo devices bonded on it and shunted with a resistive load, depend on the electrical load itself.
      
Resonance frequencies, relative damping ratios and mode shapes were established for the lowest 12 in-plane modes found in the frequency range between 1600 and 7000 Hz.
      
Damping ratios ranged from 1.09 percent to 0.53 percent.
      
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The visco-elastoplatic soil model, introduced in this paper, is consistent with the experimental relationships, such as shear modulus vs shear strain, damping ratio vs shear strain, pore pressure ratio vs cycle ratio and stress ratio vs number of liquefaction cycles, etc. The loading-reloading rules control the hysteresis loops beneath skeleton curve. The "apparent applied forces"method is suggested to evaluate the effects of soil viscosity. The generations of pore pressure are evaluated...

The visco-elastoplatic soil model, introduced in this paper, is consistent with the experimental relationships, such as shear modulus vs shear strain, damping ratio vs shear strain, pore pressure ratio vs cycle ratio and stress ratio vs number of liquefaction cycles, etc. The loading-reloading rules control the hysteresis loops beneath skeleton curve. The "apparent applied forces"method is suggested to evaluate the effects of soil viscosity. The generations of pore pressure are evaluated by"fraction cycle method", which is simple and effective, especially for waved increases of pore water pressure.The soil model have been applied to a computer program (SRHSL-1978) for the total stress analysis of seismic response of site soil.

场地地震反应问题最初是按等价线性粘弹性模型来考虑土的非线性特点的。近年来,迅速发展起真正非线性的方法。本文提出的土的非线性模型可以同时符合均匀循环荷载下的剪切模量与剪应变、阻尼比与剪应变曲线,并且可以计入粘滞阻尼的影响。为了适应不规则的剪应力循环荷载,提出了加卸载的准则及孔隙水压力生长的分数循环估算法。本文建议的模型已用于总应力法的场地地震反应计算机程序中。

Simulating earthquake loading conditions, a series of cyclic triazial compression tests was carried out on undisturbed samples of cohesive soils from Tianjin so as to investigate the dynamic shear modulus and damping ratio. It has come to the conclusion that the variation of damping ratio, as well as shear modulus, with strain amplitude can be expressed by an empirical formula. The normalized form of shear modulus vs. strain amplitude will be shown by a single curve, and that of damping ratio...

Simulating earthquake loading conditions, a series of cyclic triazial compression tests was carried out on undisturbed samples of cohesive soils from Tianjin so as to investigate the dynamic shear modulus and damping ratio. It has come to the conclusion that the variation of damping ratio, as well as shear modulus, with strain amplitude can be expressed by an empirical formula. The normalized form of shear modulus vs. strain amplitude will be shown by a single curve, and that of damping ratio vs. strain amplitude by a family of curves or a band zone with shrunk ends. The view-point about the law of damping ratio varying with strain amplitude has been developed. A comparison between the measured values from laboratory test and those based on seismic survey for the elastic modulus has been made, and a reasonable agreement has been obtained. For some of cohesive soil strata in Tianjin, some data available for seismic analyses have been provided.

模拟地震作用,对天津地区的原状饱和粘性土的剪切模量和阻尼特性作了比较广泛的试验研究.研究后认为,动态剪切模量和阻尼比随剪应变的变化规律可分别以单一的经验公式来表示。经归一化后,前者在平面上表示为单一的一根曲线,后者则表现为一簇曲线或两端是尖灭、。形的带状区.比较了由动力三轴试验测定的和根据其它相关性的试验数据换算得到的剪切模量参数,取得合理性的一致.对阻尼比随应变变化的规律提出发展性的看法。对天津地区某些饱和粘性土层提供了若干可用于地震设计的动态剪切模量和阻尼比参数。

It is shown in this paper that the real and complex roots of an nth order characteristic polynomial with gain-constant K may be closely approximated by ratios of coefficients of this polynomial, and solved with good accuracy by the method of successive factorizations. The value of gain constant K may be calculated analytically for given damping ratio, thereby root-locus curves with various K may be plotted analytically.

本文提出应用分析法,在不同的阻尼比数值下,直接计算闭环伺服机构放大系数K的简化法。当K值算出后,可通过高阶特征多项式系数比值近似地解出方程的根值,并可通过劈因解根法,在要求精度内解出根值并绘出根轨迹曲线。

 
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