Application of Correlation Integral to Diagnosis for Valve Leakage Faults

发动机 气门 漏气诊断的关联积分法

Based on study of acoustic characteristic and vibration mechanics of engine valve leakage The vibration signals are analyzed using time series . A new method on diagnosis of engine valve leakage using time series and BP neural networks .

在对发动机 气门 漏气声学特性及其振动诊断机理研究的基础上，利用测取的振动信号进行时间序列分析，提出了一种利用时间序列和BP网络诊断发动机气门漏气故障的新方法。

Based on phase space reconstruction theory correlation integrals of cylinder head vibration singals were computed out and regarded as feature sets . Some features were extracted from them and used to carry out the diagnosis for valve leakage faults .

本文在信号相空间重构的基础上，求出关联积分，然后将关联积分作为一个特征集处理，并从中提取诊断特征量，进行 气门 漏气故障诊断。

Wavelet Packet Transform Based Diagnosis Methods of I.C.Engine Valve Leakage

基于小波包变换的内燃机 气阀 漏气诊断方法

The maximum reliable ( safe ) sex : Body as a whole structure durable not subject to pipeline operating pressures and to avoid valve leakage .

最大可靠（安全）性：阀体为一个整体结构，坚固耐用，操作不受管道压力影响，并可避免 阀体 渗漏。

A study in manual valve leakage on wheel crane

轮式起重机手动操作 阀 的 渗漏研究

The Prevention Measurement of the Safety Valve Leakage of the Liquefied Petroleum Gas Tank Lorry

液化石油气罐车安全 阀 泄漏 原因及防治

After lots of experiments it was shown that the calibration method could detect the valve leakage accurately .

大量实验的结果显示，该标定方法能准确地测试出 阀门 的 泄漏 率。

The fourth section is about the auto test way and principle of the three thoroughfare valve leakage .

第四部分是 三通阀 漏泄自动检测方法与原理。

Design of the detecting system in the inner valve leakage based on acoustics

基于声谱分析的 阀门内 泄漏检测系统

It takes nuclear power plant 's SG valve leakage human error as an example for illustration .

文章以核电厂SG主给水 调节 阀 泄漏人因事件为例进行了说明。

Analysis on Three - way Valve Leakage and Governance

三用 阀 外 漏 原因分析及治理

Based on the analysis on oil-fired engineered valve leakage finds out the reason of leakage .

通过对燃油三用 阀 外 漏 现象的分析，查出三用 阀外漏的原因。

An example in diesel valve fault diagnosis ( valve clearance and valve leakage ) has shown that this method can be used in fault diagnosis .

利用这一特性对柴油机 气门间隙和 漏气故障进行了诊断，取得了满意的结果。

An investigation on a new method wavelet packet transform ( WPT ) based has been carried out to study the diagnosis of valve leakage of I.

探讨了利用缸盖振动信号诊断内燃机 气阀 漏气的一种新方法&小波包方法。

Thermal economy analysis and the classification are given for the gland-packing leakage extraction steam for heating the steam for the auxiliary turbine desuperheating water of reheater and the high pressure valve leakage . Based on a 300 MW unit its economic load parameters are calculated .

文中分别对轴封漏气、供热抽汽、小汽轮机用汽、再热减温水、高压 门杆 漏 汽等的热经济性分析分项进行了叙述，并以300MW机组额定工况的数据进行了验算。

It is proved that the quantitative detection performance of the detection system of valve leakage fault is quite well with sensitive reaction and less than ± 16 % detection error by applying the system in lab and power plants .

实验室及火力发电厂的现场验证及应用表明：所开发出的 阀门 泄漏故障检测系统的定量检测性能是良好的，检测精度（误差≤±16%）及反应灵敏度高。

Fault diagnosis of diesel valve leakage based on short-time AR spectrum analysis

基于短时AR谱分析的柴油机 气阀 漏气的故障诊断

Analysis and treatment of two valve leakage faults in molecular sieve purification system

两起分子筛纯化系统 阀门 泄漏故障的分析与处理

And then the multi index diagnosis model of valve leakage based on Mahalanobis distance sorting is established .

建立了基于马氏距离法的 气阀 漏气多指标诊断模型；

However many domestic manufacturers are using an inefficient bubble method of leak detection generally . For this actuality the acoustic emission ( AE ) method was researched in the article which could respond quickly to the valve leakage rate .

针对目前国内很多厂家普遍采用效率低下的气泡检漏法的现状，本文旨在研究能快速测试 阀门 泄漏率的声发射检测方法。

The valve leakage automatic inspection device was introduced including its structure the principle and test method .

介绍了 阀门 泄漏 量自动检测装置的结构、工作原理及测试方法。

Vibrational Diagnosis of Valve Leakage of Diesel Engine for Power Plant

发电用柴油机 气门 漏气 故障的振动诊断研究

Technology analysis of valve leakage and leaking stoppage method with working pressure

发电厂 阀门 外泄 漏及带压堵漏方法的技术分析

The valve leakage automatic inspection device

阀门 泄漏 量自动检测装置

Cause and treatment of motor - driven relief valve leakage

电动释放 阀 的 泄漏原因及处理

Analysis about Cause of Valve Leakage and Improvement Method

分析 阀门 泄漏原因和改进措施

The study instructs simulating valve leakage experiment perfects valves leakage test technology and bases theoretically for applying valve leakage test in practice .

上述研究对后续的模拟 阀门 内 漏实验具有重要的指导作用，而且对现场阀门的声发射检测与分析提供了重要的理论依据与指导。