查询词典 eddy current damping

This invention concerns a current control process for a feed-in voltage converter, wherein a detected flux-inducing current component and a detected torque-inducing currrent component of an actual currrent vector of a rotating field machine are each controlled for a flux-inducing current component set value and a torque-inducing current component set value of the rotating field machine. To that effect, a control set-value (DELTA u*sp, DELTA u*sq) is determined, dependent each time upon a determined current component control deviation. From these, current components of an actual current vector are formed each time by overlay of a formed pilot value (u*spvor, u*sqvor). This invention also concerns a device for carrying out this process.

本发明涉及一种用于馈入电压式变流器的电流调节方法，其中分别将所检测的一感应式电机的一实际电流向量（i s 的磁通感应电流分量和一转矩感应电流分量i sq ）调节至该感应式电机的一额定电流向量的一磁通感应分量额定值和一转矩感应电流分量额定值，在这种情况下，分别根据所检测的一电流分量调节偏差计算出一调节器调节量（△u * sp ，△u * sq ），由这两个调节器调节量分别通过叠加所形成的一预控制量（u * spvor ，u * sqvor ）形成一额定电压向量的电压分量（u * sp ，u * sq ），本发明还涉及一种用于实施该方法的装置。

The analysis results show that PAPF is effective for parallel resonance damping, but can not damp series resonance when capacitor current is not included in the detecting current. And when capacitor current is included in the detecting current, PAPF is prone to be unstable and can not damp parallel and series resonance.

分析表明，由于无功补偿电容器的影响，传统控制策略下的PAPF对系统谐振的抑制效果不理想，同时当检测的负载电流中包括无功补偿电容器电流时，系统还有可能出现不稳定的现象。

The process of the anticyclonic eddy breaking off from the Kuroshio bend is closely related with the increase of the cyclonic eddy at the southern part of the Kuroshio bend.

反气旋涡从黑潮弯曲中脱落的过程和黑潮弯曲南部气旋涡的增长密切相关。

During the summer monsoon the center of the anticyclonic eddy, breaking off from the Kuroshio bend, can reach about°E and the eddy shedding periods are mainly 40-120 days.

夏季风期间，从黑潮弯曲中脱落的反气旋涡的中心位置可以达到117°E附近，反气旋涡脱落的周期集中在40-120天间。

The distribution of the CFC at difference depths indicated that there is a anticyclonic eddy at the depths 0~400m, on the contrary, a cyclonic eddy at depths 500~800m, consistent with the result of Fang Wendong et al.

根据不同深度的CFC空间分布，可以断定在2004年的南沙航次考察期间，研究海区西北部0～400m存在反气旋涡，而在500～800m则存在一气旋涡，该结果与方文东等的研究结果基本一致。

Based on the former studies, this paper promotes an innovation about this topic using new satellite altimetry data and hydrographic data along with numerical experiments: Firstly, the temporal variation of the deformation of Kuroshio accompanied by the periodically shed anticyclonic eddies from the Kuroshio bend is discovered; Secondly, the major mechanism of the anticyclonic eddy separating from the Kuroshio bend, which is the frontal instability, is brought forward and then proved; Thirdly, the factors with important impact on the periodical variation of the Kuroshio bend and the eddy shedding, which are the strength of the Kuroshio transport and the circulation in the winter SCS, are determined.

本文在前人工作的基础上，利用了最新的卫星遥感资料和海洋调查资料，通过数值模式的数值实验，得到了以下前人没有得到的创新成果：发现在吕宋海峡处黑潮的形变随时间变化，并伴有反气旋涡周期性地从黑潮主体中脱落；提出并证明了吕宋海峡黑潮锋附近的锋面不稳定是反气旋涡从黑潮弯曲中脱落的主要机制；确定了对黑潮弯曲周期性变化以及反气旋涡脱落有重要影响的物理因素是黑潮流量的大小及冬季南海局地环流。

Based on the analyses of the observation data and numerical model of ocean circulation, the variations of the Kuroshio in Luzon strait (included Bashi strait and Balintang strait) have been studied by using the theories of potential vorticity conservation and oceanic Rossby wave; It was first discovered that the climatologic mean state of the Kuroshio exhibits a westward bending through the Luzon strait. The location of the Kuroshio bending is limited to the east of 119E and frequently flanked by a cold eddy to southwest of the Kuroshio; This bending of the Kuroshio favors the formation of the anticycle eddy in the east of the Luzon strait.

依据对海洋观测资料的分析，运用位涡守恒，海洋Rossby波动理论和数值模式，研究了黑潮在吕宋海峡（包括巴士海峡和巴林塘海峡）的形变特征；首次确定了在吕宋海峡黑潮的形变的平均状态是黑潮向南海的弯曲，该弯曲西端位置一般不超过119E，该弯曲的西南侧常常出现冷涡；该弯曲有利于吕宋海峡东侧形成一个反气旋涡旋。

They who know what it is to have a Reprieve brought to them upon the Ladder, or to be rescued from Thieves just a going to murther them, or, who have been in such like Extremities, may guess what my present Surprise of Joy was, and how gladly I put my Boat into the Stream of this Eddy, and the Wind also freshening, how gladly I spread my Sail to it, running chearfully before the Wind, and with a strong Tide or Eddy under Foot.

假如有人在临上绞架时忽然得到赦免，或者正要被强盗谋害时忽然获救，或者有过类似的死里逃生的经历，就不难体会到我当时那种喜出望外的心情，也不难设想我把船驶进那股回流是多么欣喜若狂。平时，正当风顺水急，我张帆乘风破浪向前，那欢快的心情是不难想像的。

Based on Prandtl's momentum transportation, this paper calculates in detail the physical quantities such as eddy viscosities, and ratio of eddy viscosity to motion viscosity, total stresses with respect to relative position in three regions of viscous sub-layer, buffer layer, and main turbulent stream for non-Newtonian fluid flowing turbulently in ducts, which according to Karman's three layer models and measurement of fluid parameters in evaluation apparatus, discusses the influence of polymer drag reduction on flowing properties of non-Newton fluid, analyzes quantitatively principle of turbulent reduction phenomenon and condition of increasing reduction rate.

摘要以普兰德动量传递理论为基础，按照卡门的三层模型，通过室内模拟环道用0号柴油及加入减阻剂在圆管内的流动参数的测定，计算了非牛顿型流体管内湍流边界层的层流内层、过渡层、湍流中心的涡流粘度，涡流粘度与运动粘度比、总应力随相对位置的变化等定量参数，探讨了高分子减阻剂对非牛顿流体流动特性的影响，对湍流减阻现象的机理与增大减阻率的条件进行了定量分析。

It's a position that reminds us of the way Eddy Merckx looked on his bike in the early 1970s, and it dates from well before Eddy's time and continued in the pro peloton well into the 1980s.

这个设定是Eddy Marckx对於车辆设定的看法，这位单车好手称霸公路车赛事的时间长达70年代到80年代之久。

Warden: That's a beautiful dog, but don't bring her again.

那是条漂亮的狗，但是不要再把她带来了。

You get up in the morning – no hangover!

你第二天早上起来的时候—不会宿醉！