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damping ratio
相关语句
  阻尼比
    Influence of Pore Water Pressure on Shear Modulus and Damping Ratio of Saturated Sands
    孔隙水压力对饱和砂的剪切模量和阻尼比的影响
短句来源
    THE TESTED RESEARCH ON DYNAMIC ELASTIC MODULUS AND DAMPING RATIO OF LOESS UNDER RANDOM VIBRATION LOADING AND EQUIAMPLITUDE LOADING
    随机振动荷载与等幅荷载作用下黄土动弹性模量和阻尼比的试验研究
短句来源
    Employing the obtained optimum frequency spacing,damping ratio and tuned frequency ratio,the evaluation is then made on the MTMD-1-MTMD-5 stroke.
    利用求得的MTMD-1-MTMD-5最优频率间隔、阻尼比和调谐频率比,评价了MTMD-1~MTMD-5的冲程情况。
短句来源
    Discussed reasonable damping ratio in low amplitude vibration and strong vibration, by the relationship of basic vibration modal and other modals, the Revised Rayleigh damping modal is presented , and the method of damping ratio calculation in complex damping structure is discussed.
    探讨了在低幅值震动和强震中合理阻尼比的取值,通过其它各阶振型阻尼比与基本振型阻尼比的关系,提出了在结构动力时程分析中较为合适的瑞利阻尼模型; 针对组合结构、混合结构等新型结构型式的大量应用,提出了这种结构阻尼比的确定方法;
    Study on damping ratio of lightweight aggregate concrete
    轻骨料混凝土阻尼比研究
短句来源
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  阻尼系数
    For new energy dissipation buildings, this article points out that the effect of additional damping ratio should be taken into consideration in the design of the structure before installation of dampers by the application of mode-superposition response spectrum method.
    根据粘弹性阻尼器等效刚度和阻尼系数的相关性,建立了粘弹性阻尼器在消能体系中附加阻尼比与其附加刚度的关系式。 对于假定的附加阻尼比,计算出其相应的附加刚度,再对等效单自由度体系进行非线性时程分析,直到最大位移响应在目标位移精度范围内为止。
短句来源
    The dynamic shear modulus and damping ratio are calculated by the formulas (l)and (2),proposed originally by Hardin & Drnevich and revised by author considering simultaneous action of the dynamic normal stress and shear stress with introducing a parameter of coativity W.
    动力剪切模量和阻尼系数按修正后的哈丁(Hardin)等人的经验公式计算,并考虑动压应力与动剪应力的共同作用.
短句来源
    The damping that is usually used in EDEM is Rayleigh damping in nature, which can be confirmed through the known damping ratio of the vibration mode.
    而 EDEM中常用粘滞阻尼的实质是Rayleigh阴尼,可通过已知的振型阻尼比确定阻尼系数
短句来源
  “damping ratio”译为未确定词的双语例句
    Hilbert-Huang transform for damping ratio identification of structures with closely spaced modes of vibration
    Hilbert-Huang变换在密频结构阻尼识别中的应用
短句来源
    Nonlinear model based on damping ratio for clays under seismic loading
    基于阻尼的地震循环荷载作用下黏土非线性模型
短句来源
    Damping Ratio of Polymer Concrete with Carboxyl Butyl Benzene at Small Deformation
    羧基丁苯聚合物混凝土小变形阻尼研究
短句来源
    Experimental research on damping ratio of reinforced concrete
    钢筋混凝土材料阻尼值的实验研究
短句来源
    Correction for Damping Ratio of Wind-induced Dynamic Responses for Structural Aeroelastic Model
    大跨度结构气弹模型风振响应的阻尼修正系数
短句来源
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  damping ratio
The damping will be defined by the shear damping ratio for the soil D, analogous to the critical viscous damping ratio for a single degree of freedom c/c0.
      
Thus, only two tests would be necessary in order to obtain both the maximum damping ratio, introduced by the piezo device, and the natural frequency of the whole system.
      
Therefore, several tests (experimental or numerical) ought to be carried out in order to determine the resistor which provides the maximum damping ratio for a mode of interest, and in turn the natural frequency of the whole structure.
      
A damping ratio of less than 0.05 percent of critical damping is proved to be valid for the aluminum panel.
      
The modal damping ratio is improved from below 0.2 percent to above 4 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。

Based on the assumption of undrained behavior, author has proposed previously a finite element method for calculating the pore pressure and permanent deformation of saturated sands during earthquake.In this paper, the method is extended to including both generation and dissipation of pore pressure coupled with deformation under two dimensional condition.The analytical procedure consists of earthquake stage and post-earthquake stage, and each stage is subdivided into several time steps. For the first stage, both...

Based on the assumption of undrained behavior, author has proposed previously a finite element method for calculating the pore pressure and permanent deformation of saturated sands during earthquake.In this paper, the method is extended to including both generation and dissipation of pore pressure coupled with deformation under two dimensional condition.The analytical procedure consists of earthquake stage and post-earthquake stage, and each stage is subdivided into several time steps. For the first stage, both dynamic response analysis and static analysis are required for every time step, but the static analysis only is necessary for post-earthquake stage.The dynamic analysis is based on equival; ent nonlinear viscous-elastie midel, similar to that proposed by Idriss and Seed in their programm QUAD4, and the static analysis is made in the way as that of Biot's consolidation theory for clay. The dynamic shear modulus and damping ratio are calculated by the formulas (l)and (2),proposed originally by Hardin & Drnevich and revised by author considering simultaneous action of the dynamic normal stress and shear stress with introducing a parameter of coativity W. From dynamic analysis, the residual volumetric and shear deformation increments are obtained according to the constitutice relationships (5) and(6), in wich N and AN are the equivalent number of uniform cycles and its increment, γd and ρd are the dynamic shear strain amplitude and dynamic normal stress amplitude, δ is a measure of asymmetry of the dynamic shear stress, and C1,C2,C3,C4, G5 are five constants.In the static analysis, the initial strain method is used, hence the above mentioned volumetric and shear deformation increments are converter! to fictive nodal forces.A response analysis of a sand layer to horizontal bed rock motion is given as an illustration.

对地震作用下饱和砂土的孔隙压力和残余变形,作者曾根据孔隙水封闭在骨架中的假定提出一个有限单元的计算方法.本文将考虑孔隙水压力的扩散和消散,对饱和砂土同时进行动力渗流和变形计算. 整个计算过程分为地震阶段和震后阶段,每个阶段再划分若干时段.在第一个阶段中,每个时段需要同时进行动力反应分析及静力计算,震后阶段只进行静力计算.动力计算采用非线性等价粘弹性体模式.动力剪切模量和阻尼系数按修正后的哈丁(Hardin)等人的经验公式计算,并考虑动压应力与动剪应力的共同作用.文中建议了一组计算动力作用下残余体积应变和残余剪切应变增量的经验公式.静力计算按皮奥(Biot)固结理论同样的办法处理,并用初应变法把应变增量化为结点力. 作为算例,文末给出了砂层水平振动的计算结果.

 
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