查询词典 damping-off

A simplified PUMA robot force control model is given in this paper. The stability and rubustness is analysised by computer simulation. The step response of position loop and force loop in external alter mode is tested, and prove that the system posses critical damping ratio.

简化得出了PUMA机器人的力控制模型，利用计算机仿真的方法，分析了系统的稳定性及鲁棒性，给出了最佳参数的选择，测试了在外部修正方式下位置控制环及力控制环的阶跃响应，证明位控环具有临界阻尼的特性，并讨论了参数选择值不同时对系统性能的影响。

In this paper, it is pointed out that the accuracy of measurement must be considered for the discussion about the restitution time of damped vibration, and it is in the "critical state of weakly damped vibration" defined by this paper, not the critical damping state, that the restitution time is the shortest.

1 问题的提出和回复时间的定义众所周知，阻尼振动按阻尼的大小可分为弱阻尼、临界阻尼和过阻尼三种情形。几乎所有的教材均指出，临界阻尼运动是物体刚能不做周期性运动而又最快地回到平衡位置的运动，也即其回复时间最短。

In the spark, operating under the critical damping state, with flash time at about 2 X 10-6 Sec., the ion lines of higher excitation potential first appear and appear shortly.

在放电时间约为2×10~(-6)秒，工作于临界阻尼状态下的火花中，激发电位高的离子线先出现，而且很短暂。

Based on theory of simple harmonic oscillation in physics, this paper presents a novel model for production decline prediction given by deformation of critical damping oscillation equation which is predigested to Arps exponential decline form.

基于物理学中的简谐振动原理，提出了把阻尼振动方程中的临界阻尼振动方程变形得到一种新的产量递减模型，可简化为Arps指数递减形式，经实例计算，可以用来预测油田产量，以此指导油田开发和管理。

This work employs operator-splitting method / finite element method to study dynamic performance and the stability of liquid-lubricated herringbone grooved journal bearing with micro-polar lubricants. Load capacity, friction resistance, stiffness/damping coefficients and critical rotor mass were investigated.

本文采用算子分裂/有限元法计算微极性流体润滑剂的螺旋槽径向轴承承载力、粘性阻力、润滑油膜刚度系数和阻尼系数等特征量，研究轴承的动力特性和稳定性问题。

Wind-induced vibration Fluid-structure interaction Added mass Aerodynamic damping Critical wind velocity

风致振动；流固耦合作用；附加质量；气动阻尼；临界风速

In this paper, the JFO condition, satisfied with global mass continuity, is incorporated into an universal Reynolds equation with micro-polar fluid which is solved for the oil film pressure using OSM and FEM. The bearing load capacity and friction resistance were given, and stiffness/damping coefficients and critical rotor mass were obtained by solving a pressure perturbation equation with micro-polar lubricants.

本文采用满足全流场质量连续的JFO边界条件，采用微极性流体的广义雷诺方程来求解油膜压力分布，进而获得油膜承载力和粘性阻力等轴承动力特性量；采用小参数摄动法得出油膜压强扰动方程，并采用有限元法解出扰动压强，积分扰动压强获得油膜的阻尼系数和刚度系数，进而求得了表示轴承油膜稳定性的临界转子质量。

At last, the whole model including the cross beam and the supporting cylindrical shell is modeled and computed to evaluate vibration damping performance.

最后建立了井字梁与圆柱壳的整体有限元模型，进行了对整体模型的粘弹阻尼减振分析计算。

Then, the cross beam with I-section is modeled and calculated by considering different damping depths in order to analyze which depth can lead to a better vibration control effect.

然后，针对几种不同铺设深度的情况对复合材料井字梁进行了建模分析，对比得出了较佳的阻尼铺设位置。

The coupling stiffness and damping coefficients of the thrust bearing under the crosswise vibration of the rotor were studied.

对推力轴承在转子横向振动下的偶合刚度和阻尼系数进行了系统的研究。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。