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equivalent damping ratio
相关语句
  等效阻尼比
     The effect of systematic parameters on the structural equivalent damping ratio in translational and torsional direction is studied for torsionally coupled vibration.
     对结构扭转耦联的振动问题进行研究,分析了控制系统各参数对结构平移等效阻尼比和扭转等效阻尼比的影响。
短句来源
     Response analysis in the frequency domain is also studied by using random vibration theory,from two aspects of vibrartion-absorbing coefficient and equivalent damping ratio to study the effect of μ_d 、 λ_d 、ζ_d and φ_(k_1) to vibration control.
     应用随机振动理论在频域范围内进行了响应分析,基于减振系数β_x和等效阻尼比ζ_e两个重要指标,分别研究了质量比μ_d、频率比λ_d、减振器阻尼比ζ_d和安装位置φk_1等参数对减振效果的影响规律。
短句来源
     The influence of systematic parameters on the structural equivalent damping ratio is analyzed for purely torsional vibration.
     对结构纯扭转的振动问题进行研究,分析了控制系统各参数对控制后结构等效阻尼比的影响。
短句来源
     Equivalent Damping Ratio Analysis of the High-rise Buildings' Rectangular MTLD System
     高层建筑矩形MTLD系统的等效阻尼比分析
短句来源
     Analysis of equivalent damping ratio of high-rise structure building TLD system
     高层建筑矩形TLD系统等效阻尼比分析
短句来源
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  等效结构阻尼比
     Based on the Code for Loads of Building Structure in China,a practical method of designing nonlinear passive dynamic absorbers for controlling wind-induced vibration responses of highrise structures is presented,using the concept of equivalent damping ratio of a structure and equivalent dynamic parameters of TMD.
     文中利用求出的等效TMD动力参数和TMD对结构风振反应控制效果等效结构阻尼比的概念 ,提出了基于中国荷载规范的非线性被动动力减振器对高耸结构风振控制的设计方法。
短句来源
  等价阻尼比
     (3) The equivalent linearization method is studied and the inelastic system is replaced by elastic system. The relations of equivalent damping ratio and ductility coefficient for equivalent single-degree-of-freedom system is suggested.
     三、对等价线性化方法进行了研究,将弹塑性体系等价为弹性体系,建立了等效单自由度体系的等价阻尼比和延性系数的关系。
短句来源
     The equivalent damping ratio and the control gain are changed coordinatedly in control. Each performance index of the system will be well regulated and the effect of the system control will be promoted with the premise of the system stability ensured.
     控制中同时改变系统的等价阻尼比和控制增益,可以很好地协调各性能指标,在保证系统稳定性的前提下,提高系统的控制效果。
短句来源
     Through theory deducing and analyzing,the calculation formulas of equivalent stiffness and equivalent damping ratio as well as the graph of system period are brought forward.
     通过理论推导和分析,得出了新型减隔震支座的等价刚度和等价阻尼比的计算式和系统周期图示.
短句来源
  “equivalent damping ratio”译为未确定词的双语例句
     The equivalent damping ratio and stiffness coefficient of the LED device are studied, and the general equivalent formula of energy dissipation devices is established.
     研究了将铅挤压阻尼装置等效成阻尼比和刚度系数的方法,建立了消能装置的通用等效计算公式;
短句来源
     Based on the definition of the equivalent viscous damping, the formula of equivalent damping ratio of the structure with hysteretic dampers is derived. Second, the optimum strength ratio of damper system is defined as strength ratio when the equivalent viscous damping ratio is maximum, Thus was clear about has caused the hysteretic dampers to consume the energy to achieve the biggest mild hysteretic dampers structure should have, namely the damper seismic response mitigation effect could achieve the optimum condition.
     本文首先基于等效粘滞阻尼比的定义,推导了软钢阻尼器结构等效粘滞阻尼比的表达式,据此进一步确定了等效粘滞阻尼比取最大值时的分配率,将其定义为阻尼装置受剪承载力最优分配率,从而明确了使软钢阻尼器的耗能量达到最大时软钢阻尼器结构所应具备的条件,即阻尼器的减震效果能够达到最佳状态。
短句来源
     As a result,computation work is decressed to50% of the original. During the determination of feedback gains,the concepts ofequivalent inherent frequency and equivalent damping ratio specified by MIL-F-8785C are utilized. Considering the influence of actuator dynamics and reasonablepole-assignment,we deduce approximate feedback gain formulas.
     在反馈增益的计算中,运用 MIL-F-8785C 中的“当量固有频率”与“当量阻尼比”的概念,选择合理的极点分布,推导了考虑舵回路惯性影响的调参规律近似表达式。
短句来源
     Taking a tall building of 24 stor ies as an example, all parameters contributing to the equivalent damping ratio a re studied, and its design optimized obtaining good control efficiency.
     最后 ,以一 2 4层建筑为例 ,笔者研究了影响系统阻尼比的各个基本参数 ,并且对其进行优化设计 ,以提高系统的控制效果
短句来源
     The factors which affect the level stiffness,energy dissipation and equivalent damping ratio of SMA-rubber seismic isolation bearings including level displacement amplitude,level loading frequency and vertical load were studied. Result showed that the new SMA-rubber seismic isolation bearings have better hysteresis and energy dissipation capabilities. It provided the base to optimize the SMA-rubber seismic isolation bearings.
     研究了水平位移幅值、水平加载频率以及竖向荷载等因素对SMA橡胶支座水平刚度、耗能量以及阻尼等基本力学性能的影响,结果表明,新型的SMA橡胶支座均可有效提高橡胶支座的耗能性能和回复能力,并为SMA橡胶支座优化设计提供了依据。
短句来源
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  equivalent damping ratio
It is shown that the equivalent damping ratio increases inproportion to the square of frequency.
      


A theory for describing deformation behaviour of sands under cyclic loading is proposed on the basis of the assumption that the permanent deformation of sands after each cycle of loading is mainly determined by the effctive stress states at the peak and the valley of that cycle of loading and a loading history parameter named as effective number of cycles. A series of cyclic triaxialtests on a medium sand has been per- formed in order to estabilish two sets of empirical relationships required in this theory....

A theory for describing deformation behaviour of sands under cyclic loading is proposed on the basis of the assumption that the permanent deformation of sands after each cycle of loading is mainly determined by the effctive stress states at the peak and the valley of that cycle of loading and a loading history parameter named as effective number of cycles. A series of cyclic triaxialtests on a medium sand has been per- formed in order to estabilish two sets of empirical relationships required in this theory. The first one, giving the expressions for mean shear modulus and equivalent damping ratio, is derived from the model proposed by Hardin and Drnevich with a revision to consider the coaction of cyclic normal stress and cyclic shear stress. The second one gives the expression for increments of permanent volumetric strain and deviatorie strain, taking account of the influence of assymetry of stress levels at the peak and the valley of loading in each cycle. The theory may be used to predict the liquefaction potential and deformation of sands subjected to repeated loading under plane strain condition.

文中探讨了建立砂土动力应变关系的途径,并根据砂土的动力变形主要取决于每个荷载循环中动应力达到峰值和谷值时的有效应力状态的假设,提出一个计算动力变形的平均发展过程的理论。从这一理论出发,根据一种砂料的三轴反复荷载试验结果,建议了一组计算残余体应变和残余剪应变的经验公式,并对哈定和达尼维奇(Hardin and Drnevich)的动剪切横量公式进行了修改。这些公式可以用于计算低频动荷载作用下砂土的液化和变形。

In this paper, based on the detailed analysis of the dynamic cutting force of the helical tooth end milling cutters and its direction coefficients, a method of analysing the behaviour of regenarative chatter for helical tooth end milling cutters with waved cutting edges is proposed.The cutting tests are carried out to check the theoretical analysis on validity and they have proved to be in good agreement with the results calculated from the theoretical analysis. The results obtained are summarized as follows:...

In this paper, based on the detailed analysis of the dynamic cutting force of the helical tooth end milling cutters and its direction coefficients, a method of analysing the behaviour of regenarative chatter for helical tooth end milling cutters with waved cutting edges is proposed.The cutting tests are carried out to check the theoretical analysis on validity and they have proved to be in good agreement with the results calculated from the theoretical analysis. The results obtained are summarized as follows: 1. The proposed theoretical formulae for the calculations of instantane -ous and mean direction coefficients can be applied to up- and down- milling operations with helical tooth end milling cutters. By using these formulae the relations between the chatter and cutting conditions can be found, which enables us to select the optimum cutting conditions easily. 2. The equation which can be applied to the determination of the critical width of cut for helical tooth end milling cutters with waved cutting edges is given below: Where: Kd is the coefficient of chip thickness, b is the critical width of cut, D is the equivalent damping ratio, K is the equivalent static stiffness, Rm is the mean direction coefficient, Z is the number of teeth, ψ is the phase shift between the two vibration waves in successive cutting teeth, ξ is the ratio between the length of the chip and the lead of the waved cutting edges, ηi, η2, ……,ηz are the ratio between the partial length on the underside of the chip and the length of the chip respectively. 3. It is dear from the theoretical analysis and the experimental results th at the critical width of cut for the helical tooth end milling cutters with waved cutting edges is considerably larger than that of the conventional milling cutters. Practically, this method of analysis can also be applied to the determination of the chatter behaviour for the helical tooth end milling cutters with any kinds of grooves on the cutting edges and it may be expected o obtain the similar results mentioned above.

本文从理论上阐述了波形刃螺旋齿立铣刀再生自激振动的分析方法。在深入分析 了螺旋齿立铣刀的动态铣削力和方向系数的基础上,通过颤振稳定性的理论计算来说 明波形刃螺旋卤立铣刀比普通螺旋齿立铣刀具有更好的抑制再生自激振动的性能.最 后,用切削试验证明理论分析方法的正确性。

Referring to the adaptive scheme proposed by U.Hartmann et al.,this paperpresents a simplified model for parameter-estimation and an extended Kalman filterparameter-estimation algorithm.As a result,computation work is decressed to50% of the original.During the determination of feedback gains,the concepts ofequivalent inherent frequency and equivalent damping ratio specified by MIL-F-8785C are utilized.Considering the influence of actuator dynamics and reasonablepole-assignment,we deduce approximate feedback...

Referring to the adaptive scheme proposed by U.Hartmann et al.,this paperpresents a simplified model for parameter-estimation and an extended Kalman filterparameter-estimation algorithm.As a result,computation work is decressed to50% of the original.During the determination of feedback gains,the concepts ofequivalent inherent frequency and equivalent damping ratio specified by MIL-F-8785C are utilized.Considering the influence of actuator dynamics and reasonablepole-assignment,we deduce approximate feedback gain formulas.A simplified andappropriate logic condition for the start of gain adaptation is recommended.Thusthe system stability and good flight handling quality are ensured.The estimation oftime varying parameters during the climbing maneuver with decreasing speed anddescending maneuver with increasing speed,the climbing or descending maneuverwith nearly invariant speed,is studeid in detail including the role of probe-sig-nals.The divergence phenomenon encountered in the conditions mentioned above isanalyzed and means for overcoming it are investigated.

本文参考 U.Hartmann 等人的方案,提出一种简化的参数估计模型和改进的卡尔曼滤波参数估计法,使运算量减少二分之一。在反馈增益的计算中,运用 MIL-F-8785C 中的“当量固有频率”与“当量阻尼比”的概念,选择合理的极点分布,推导了考虑舵回路惯性影响的调参规律近似表达式。文中给出一种简易可行的启动自适应调参程序的逻辑条件,从而保证了系统的稳定性和良好的飞行品质。还深入研究了爬高减速、下滑增速及准等速爬高和下滑过程中时变参数的估计方法,加入探测信号对系统的影响,以及这些过程中出现发散现象的原因和克服的措施。

 
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