查询词典 fault detect

This paper first introduces a system which can detect vehicle disobey the red light. then introduces a arithmetic with shadow elimination to solve the problem of violations detection of yellow line: by day,the quality of the image is good,this arthmetic uses a method which combine the line-frame detection and the HSV color information analysis.this method detect violations according as whether the line-frame of yellow is being destroyed. In order to solve the most important problem in apply instance—interference of shadow,we add HSV color information analysis in the area of yellow line which line-frame is being destroyed. If the shadows proportion is below the threshold,then we determine vehicle violative of yellow line; at night,the quality of the image is not good, we calculate the grey image of differences to detect violations.

本算法在白天图片质量较好时，采用结合HSV颜色空间分析线结构检测算法，该算法利用黄线区域的边缘结构特征作为依据检测是否存在车辆或阴影压黄线，针对实际应用中存在的最大问题即阴影的干扰，加入了HSV颜色空间分析来检测黄线边缘残缺区域，若该位置阴影比重低于一定比例，才认定为是车辆压黄线违章而不是阴影干扰；在夜晚图片质量下降的时候，采用灰度差值法。

The network communication is applied in vehicle detect system which is one of the most important parts in orbit traffic. The working information of the vehicles can be detected and transmitted to the vehicle control system on the floor through the vehicle detect system. The realization of network communication is introduced into the vehicle detect system, and the mechanism of network communication is transplanted to the embed system based on Reworks.

主要介绍了轨道交通车况检测系统中网络通信技术的应用，车况检测系统是轨道交通系统的重要组成部分，通过车况检测系统可以实时采集列车的车辆工况监控信息并将它及时传输给地面的车辆工况监控系统，本文阐述了在车况检测系统中网络通信的实现方法，并给出了基于Reworks嵌入式系统下的网络通信机制。

As the contour of a wheel rim is easier to detect than the contour of a wheel, and the contour of a wheel rim and the contour of a wheel are approximately concentric circles on the same plane, we first detect the contour of the wheel rim, the center of the wheel rim and the contacting point between the wheel and the ground, then we detect the contour of the wheel via the invariance of cross ratio under projective transformation.

由于提取钢圈轮廓比提取车轮橡胶轮廓容易，而且钢圈轮廓和车轮轮廓可以近似看作同一平面上的两个同心圆，所以在本文中，我们首先提取钢圈轮廓、钢圈圆心和车轮与地面接触点在图像上的投影，然后利用射影变换保持交比不变的性质求出车轮轮廓。

Familiar fault conditions of DTC induction electromotion system and ITC induction generation system are analyzed. This makes a foundation for fault detect.

对采用直接转矩控制技术的异步电动系统，研究了两种有效可行的容错方案。

Engineering practice shows this detector can rapidly detect the fault of aerocamera,and shorten the fault obviation time,guarantee aerocamera work normally.

实践证明检测仪可快速有效的对航空相机进行故障检测，缩短排故时间，保证相机正常工作。

The multi-dimensional signals measured by sensors with a machine working under normal condition or fault condition, can be used to build Q statistic and T^2 statistic respectively to detect the state of the machine. Meanwhile, the feature vector is constructed by the Q value and the T^2 value, the geometrical distance between the normal feature vector and the feature vector H when the machine goes wrong is used to realize the fault location. The results show that the method is feasible.

利用多个传感器测量的异步电机多维信号参量，构建电机在正常工作和发生故障时的Q统计和T^2统计，以实现电机的状态检测；利用Q统计和T^2统计值构建电机的状态特征向量，通过比较度量当前电机的特征向量与电机发生故障时的特征向量H的几何距离来实现电机故障的定位与分离实验证明，该方法可以有效地实现故障的诊断与分离。

The result shows that not only it can be used to detect the characteristic signal of the rotor bar broken fault with great sensitivity but also be used to evaluate the severity of the fault.

有关方法报道很多[1，2]，利用小波分析对定子电流中所产生的谐波分量进行提取、实现实时、非接触性检测，是一种有效的手段。

Firstly, a method to estimate the rotor speed, which is based on BP neural network, is introduced in this paper. Secondly, the Park Vector approach is used to monitor and diagnose the inter-turn fault of the stator winding. Finally, this paper studies thoroughly a novel approach to detect rotor bar breaking fault, which is based on the perfect combination of the Hilbert Transform and digital filter.

具体工作如下：采用BP神经网络对异步电动机转子转速进行无速度传感器估计；对定子绕组匝间短路故障，采用派克矢量方法进行监测与诊断；对于转子断条故障，详细介绍了一种新的基于希尔伯特变换与数字滤波的在线监测方法。

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

The sealing properties of fault are not only related to tectonic stress, but also to strike and dip angle of fault, depth, lithology of each fault wall, and fluid pressure.

断层的开启与封闭，不仅与构造应力直接相关，而且与断层的走向、倾角、深度、两盘岩性及流体压力直接相关。

Cable dampener cannot be rolled up but must be hung over the cable.

缆帆不能被卷起，必须保证处于展开状态

"This skylark is a present from my master," he says.

"这只云雀是我主人献上的礼物。"他说。