故障检测

The arc voltage signal and arc light intensity signal are detected in order to get fault arc reliably.

为可靠地检测出低压配电箱中的故障电弧，分别对电弧电压信号和弧光信号进行了检测。

It is avoidless that machines vibrate. Acute vibrating is the primary reason of destroying machines. So detecting vibrating signal may be used to find out machines working condition. At the same time the signal can be analyzed and blooey signal can be found out.

机器的振动是难免的，过大的振动又往往是机器破坏的主要原因，因此，我们通常利用检测设备检测振动信号来监视机械的工作状态，并对信号进行分析处理提取故障信号。

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。

The invention relates to a communication detection method, in particular to a CAN bus communication detection method for detecting communication fault points on CAN bus of aluminum electrobath control system.

本发明涉及一种通讯检测方法，具体地说是涉及一种应用于判断铝电解槽控系统CAN总线通讯故障点的铝电解槽控系统CAN总线通讯检测方法。

The power testing and misfire failure diagnosis are both the emphases of engine testing and diagnosis technology.

发动机功率检测与失火故障诊断均为发动机检测与诊断技术研究的重点。

The characteristic of librating signal of engines jar cover in frequent field is analyzed.The librating diagnosis mechanism to leaking gas fault of engine valve is investigated,and the distilling method of chatacter parameter Eh/Ew which is ratio of high frequency energy to chief energy is introduced.

分析了发动机缸盖振动信号的频域特性，在此基础上，对发动机气门漏气故障的振动诊断机理进行了研究，提取高频能量与总能量之比E_h／E_w作为特征参数来实现气门漏气故障的检测。

Using synthetically the now available fault diagnosis meanes,having it unite effectively to the expert system,manufacturing the automobile inspection system with high efficiency and the self-improve capacity ,it is a good direction in the future.

综合利用现有的故障诊断方法，使之有效地与专家系统相结合，研制成高效而具有自我完善功能的汽车检测线故障诊断系统，是一个很有前途的发展方向。

In order to realize, the integrated testing of dynamic parameters, real-time and in-system inspection, and diagnoses of fault of engine, at the same time considering the universal and specific performance, a new-fashion real-time testing system design for the integrated parameters of engineer is proposed based on the technology of parallel procession of multi-DSP and virtual instrument.

为了实现发动机动态参数的综合测试、实时在线检测和故障诊断，综合考虑其通用性和专用性，提出了一种基于多DSP并行处理和虚拟仪器技术的新型发动机综合参数实时测试系统设计，重点阐述了系统的硬件结构和软件框架设计，并对系统实时、远程故障诊断进行了探讨。

At present the main product not damages the examination class instrument for the project scene: Thunder and lightning radiation monitor meter and multi- stations thunder and lightning monitor and positioning system, low tension cable fail monitor, cable fault position finder and so on.

目前主要产品为工程现场无损检测类仪器：雷电辐射监测仪和多站雷电监测与定位系统、低压电缆故障检测仪、电缆故障定位仪等。

Chemical detection is mainly production rate and the ratio of three to analysis and judge, through the transformer oil content of gas.

化学检测主要是通过变压器油中特征气体的含量、产气速率和三比值法进行分析判断，它对变压器的潜伏性故障及故障发展程度的早期发现具有有效性。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。