查询词典 leakage magnetic flux

This paper introduced the basic principle of the magnetic flux vector control technique and the basic composition of it s circuit, mainly introducing the method and the control process in which magnetic flux vector control technique is used to improve the control property of big bridge crane , and to get good results.

介绍了磁通矢量控制技术的基本原理及其电路的基本组成。着重介绍了磁通矢量控制技术用于改善大型桥式吊车控制性能的方法和控制过程，以及该技术应用所取得的良好效果

The working principles of the MFCG with a perfect helix winding are shown in two ways: the magnetic flux conservation and the magnetic flux linkage conservation.

总结了MFCG区别于普通发电机的根本特征，鉴于MFCG种类繁多，依据绕组结构和形状、电枢运动方式、适用的物理原理、应用领域等特性对19类MFCG进行了系统分类，并分别讨论了各类别的技术特征。

The vector plot of 3D magnetic flux and the surface plot for the radial component of magnetic flux density were obtained,which could show the feature of the MLF near defect expressly.

利用数学模型对漏磁信号进行了仿真分析，得到了三维磁通密度矢量图和它的径向分量曲面图，直观地显示了缺陷附近漏磁场的特点。

Three important contents （the phase relation between stator voltage and magnetic flux, the magnetic flux of stator approximating a round and SVPWM overmodulation） are simulated, and the gotten simulation results all accord with theoretical analysis.

通过对定子电压与磁链的相位关系、磁链对圆的逼近及过调制现象三个重要内容的仿真研究，结果表明与理论分析都很一致，从而为SVPWM技术的实际应用及研究提供了一定的参考价值。

Magnetic flux: The flux through a surface is the integral over the surface of the normal component of the magnetic induction; expressed in webers in mks units or in maxwells in cgs units (l weber = 108 maxwells).

磁通量：某个面的磁通量为该面上磁感应强度法向分量的总合；米-千克-秒单位制中用韦伯来表示或在厘米-克-秒单位制中用麦克斯韦来表示(l 韦伯= 108 麦克斯韦)。

This paper combines with pipeline delivery of our countrys actual conditions and other methods of detection and location. To the leakage characteristic of the fault to the long-distance natural gas pipeline, a method is raised, which is on the basis of wavelet and negative-pressure-wave to detect the leakage and locate. Jobs in this paper are as follows:Multi-resolution decomposition and reconstruction of wavelet transform is utilized to filter the noises, which the leakage brings the noises of negative-pressure-wave. The research is worked in the wavelet and wavelet packet filter. The wavelet transform have a fast and accurate recognition capability to signal singularity. This paper chooses wavelet technology to catch the break point of pressure signal.

本文结合我国管道输送的实际情况和目前现有的各种泄漏检测与定位方法，针对天然气长输管线泄漏故障的特点，提出了基于小波分析和负压波相结合的方法检测泄漏并定位，其中主要进行了以下几个方面的工作：利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行降噪处理，并对小波及小波包优化的降噪效果进行对比性研究；利用小波变换技术对信号奇异点的快速、准确的识别能力，捕捉负压波信号的突变点，从而判断是否有泄漏发生。

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

For expeller seal combined with packing, leakage should be checked in place with packing: before the motor starting, open shaft seal water. If excessive leakage, please tighten gland nuts until guttate leakage.

对于付叶轮加填料组合式密封，应检查填料处泄漏量：启动前，先打开轴封水，如果泄漏量过大，应拧紧填料压盖螺母，直至泄漏呈点滴状为止。

In this paper, we systematically analyze the reason or factor effecting the leakage current, and adopt guard ring to reduce PIN-detector leakage current. The result indicated that the leakage current have been reduced 0.5 1 order by guard ring.

本文系统地分析了漏电流产生的机理及其主要的影响因素；在现有工艺条件基础上，采用保护环结构使PIN电流型探测器的漏电流减少了0.5～1个量级。

Modern power spectral estimation is applied in leakage current analysis in thispaper and the global character of leakage current is obtained by associated analysis ofpower spectral character and root mean square value of leakage current.

将现代功率谱估计的方法应用于泄漏电流分析中，通过泄漏电流的功率谱特征与泄漏电流时域特征中的有效值的联合分析，更好地把握了泄漏电流的总体特征。

" I' d like to get some rough idea about music in the baroque ear, please."

请简要介绍一下巴罗克时期的音乐，好吗？

The results showed that the peak latency and pattern of SEPs elicited by electrical needling in LI-l1 and MP were similar. The amplitude of SEPs elicited by electrical needling in LI-l1 was higher than that of MP. There was no obvious SEPs generation when MM was electrical needling.

结果显示，电针刺激曲池穴和其邻近桡侧伸腕长肌运动点诱发性脑电波的波形和波峰时间是类似的，只是穴位的诱发性脑电波波幅较大，而电针刺激非穴位点并没有明显的诱发性脑电位。