查询词典 damping-off

Based on description method of damping motion in mechanical vibration, variables movement of generator are divided into two basic motion models: damping oscillation and critical damping motion. Detail methods of extracting damping parameters from simulation data is introduced to establish variable motion models. An approximate method is put forward to simulate low-frequency signal and generator response characteristic, from which motion models and damping parameters of main variables are obtained. The influences of oscillation amplitude, frequency and initial operating point of power system to the motion damping parameters are analyzed.

借鉴机械振动中阻尼运动的描述方法，将低频振荡下发电机主要变量的运动归纳为阻尼振荡和临界阻尼两种基本运动形态；介绍了从仿真数据提取阻尼参数建立参数运动模型的方法，实现对发电机振荡特性的量化分析；提出一种系统侧低频振荡信号的近似模拟方法，并应用于发电机响应仿真，获得了主要变量的运动模型和阻尼参数；分析了系统侧振荡幅度、频率以及初始工况对发电机功角振荡的影响。

Through the conductor self damping measurements verified the rationality of improved formula for calculating transmission line self damping; through the damping tests of stockbridge damper is installed in different location, indirectly verified the correctness of the location optimized calculation of the stockbridge damper; through the damping test of wire dampers, the correctness of damping energy calculated theory of wire dampers are proved.

通过输电线自阻尼测试试验，验证了改进后输电线自阻尼计算公式的合理性；通过防振锤不同安装位置时的消振试验，间接验证了优化后的防振锤安装位置计算方法的科学性；通过阻尼线的消振试验，证明了阻尼线耗能计算理论的正确性。

Based on the original damping coefficients formula, the improved Reynolds equation is presented and the damping coefficients formula include the frequency variable is recomputed. The relation with the damping coefficients and working frequency is obtained and the results are certified using the finite element analysis simulation. Moreover, the damping coefficients of perforated-hole film are obtained on the basis.

本文在推导原阻尼系数公式的基础上，提出了改进的雷诺方程，重新推导得到了包含频率信息的膜结构阻尼系数公式，指明了阻尼系数与工作频率之间的关系，并通过有限元仿真分析给与验证，同时在此基础上得到多孔方形膜结构的阻尼系数。

In the fourth paragraph, how the theory of the damping to forging hammer foundation advances at home and abroad, the research and application of the implement for damping to forging hammer, the structure of damping to forging hammer and the calculation methods for forging hammer foundation vibration system, which are used at home nowadays, are particularly introduced.In the fifth paragraph, aiming at direct damping under anvil block of forging hammer, the author bases a mechanics model of two-degree with damping, and optimizes the vibration parameters both in frequency field and in time field, then finds out the new simple method of optimizing the vibration parameters of the damping device under anvil block of forging hammer.

第五章针对锻锤砧下直接支承式减振基础，建立了锻锤减振系统的二自由度有阻尼振动力学模型，然后用傅立叶变换法求出振动传递率的频率关系，用直接积分法求出砧座和基础位移的时域响应，并分别对频域函数和时域函数进行参数优化，最终建立起频率函数—时域函数—优化参数间的相互关系，从而找到了锻锤砧下隔振器参数优化的简便新方法。

In order to study the dynamic and instability rule and gain a damping evaluation method according to the test result, damping research ways of several foreign and domestic foil bearing types were compared. The interaction among cells was considered based on the approach of separating damping from stiffness. An effective damping evaluation method was developed based on the energy dissipation method. The structural damping of two-layer free plate foil bearing was analyzed on the basis of energy dissipation method.

为了更好地研究箔片轴承的动特性和稳定性，得出与实验结果相符合的评价方法，首先对国内外几种有关箔片轴承库仑阻尼的研究方法进行了比较，根据阻尼和刚度分离评估的思想，考虑箔片之间和箔片单元之间的相互作用，基于能量耗散的思想提出了一种有效的箔片轴承阻尼评估方法，最后对双层同向自由平箔结构箔片轴承的结构阻尼进行了详细分析和数值比较。

Dynamic characteristic testing is applied to evaluate the damping system performance by comparing damping force, damping ratio and damping time constant on various designs.

接著对所完成的转轴涡电流减振系统进行动态特性的测试，以减振力、阻泥比和减振时间常数来评比减振系统之性能表现。

For the second part, the damping behavior of Mg matrix composite was studied. It is found that the graphite fiber achieves better damping capacity than other reinforcements. The phase transformation happened in the Mg matrix can improve damping capacity and with the increase of reinforcement damping capacity can also be improved at high temperature.

其次，对镁基复合材料的阻尼行为的研究，发现石墨纤维比其它增强物具有更好的阻尼效果，基体镁合金的相变过程能提高复合材料的阻尼性能，增加增强物含量能增加复合材料的阻尼且高温下的效果更好。

Because the error mainly comes from theresonant region, the error correction method can only be used in resonant region, andcan effectively improve the efficiency of the statistical analyzing solutions. Two types of the mistuned bladed disks, whose friction damping are blade dryfriction damping and blade-to-blade dry friction damping, are modeled respectively. Amulti-harmonic method which can employ the fast Fourier transformationtechnique is proposed to investigate the vibratory response of the bladed disks withthese two types of nonlinear friction damping. Formulations of the solution for thesetwo types of motion functions are deduced. The characteristics of the forced responseof the bladed disks with these two dry friction damping are analyzed and summarizedunder various system parameters. The vibratory response of the bladed disk with dryfriction scatter mistuning is investigated.

针对叶盘系统中两类主要的非线性干摩擦阻尼形式，分别建立了具有叶片干摩擦阻尼和叶间干摩擦阻尼的失谐叶盘系统的非线性力学模型；提出了一种可利用快速傅立叶变换技术的多谐波分析方法；分别推导了具有这两类干摩擦阻尼形式的叶盘系统运动方程的求解公式；在各种系统参数条件下，研究了干摩擦阻尼失谐叶盘系统的受迫振动响应特性；对具有干摩擦散乱失谐的叶盘系统振动响应进行了研究，分析总结了干摩擦散乱失谐对叶盘系统振动响应特性的特殊影响规律。

There are two kinds of damping layers disposition. One is damping layer on beam that is free damping layer. The other is on neural axis of beam that is constrained damping layer.

阻尼层配置方式有两种，第一种阻尼配置位於梁表面为贴覆黏滞阻尼层，另一种位於梁的中性轴为夹芯黏滞阻尼层。

The damping mechanism of magnesium alloy was introduced, which is belongs to dislocation damping mechanism under the room temperature. But under high temperature, besides dislocation damping, there is also crystal interface damping.

介绍了镁合金的阻尼机理，在常温下其阻尼机制主要是位错机制，在高温条件下，由于晶界也参与滑移，所以除了位错阻尼外还有晶界阻尼的贡献。

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。