Gear transmission condition monitoring method and apparatus
    1.
    发明授权
    Gear transmission condition monitoring method and apparatus 有权
    齿轮传动状态监测方法及装置

    公开(公告)号:US06507789B1

    公开(公告)日:2003-01-14

    申请号:US09618440

    申请日:2000-07-18

    IPC分类号: G06F1900

    摘要: A gear transmission monitoring method includes: forming a good operating condition baseline matrix by, for each of a plurality of different gear mesh frequencies, obtaining a good operating condition signal indicative of gear transmission conditions over a segment of time and transforming the obtained good operating condition signal into a good operating condition time-frequency spectrum; and then obtaining a gear mesh frequency and a test signal over a segment of time, transforming the obtained test signal into a test time-frequency spectrum, and using the gear mesh frequency and the good operating condition baseline matrix to examine the test time-frequency spectrum to monitor gear transmission conditions.

    摘要翻译: 齿轮传动监测方法包括:通过针对多个不同齿轮啮合频率中的每一个形成良好的操作条件基线矩阵,获得指示一段时间上的齿轮传动条件的良好操作条件信号,并且变换所获得的良好操作条件 信号进入良好的运行状态时频谱; 然后在一段时间内获得齿轮网格频率和测试信号,将获得的测试信号转换为测试时间 - 频谱,并使用齿轮网格频率和良好的运行条件基线矩阵来检验测试时间频率 频谱监测齿轮传动条件。

    Apparatus and method for monitoring shaft cracking or incipient pinion slip in a geared system
    2.
    发明授权
    Apparatus and method for monitoring shaft cracking or incipient pinion slip in a geared system 有权
    用于监测齿轮传动系统中轴裂纹或初期小齿轮滑移的装置和方法

    公开(公告)号:US06449564B1

    公开(公告)日:2002-09-10

    申请号:US09197783

    申请日:1998-11-23

    IPC分类号: G01B528

    摘要: A diagnostic technique for monitoring shaft cracking or incipient pinion slip involves monitoring a shift in a characteristic natural frequency of an operating system such as a geared system of a locomotive. The technique involves monitoring a shift in the characteristic natural frequency or resonance of a shaft for detecting shaft cracking. The technique also involves monitoring a shift in the characteristic natural frequency of one or more assemblies of the operating system which include a pinion and detecting a shift in the one or more characteristic natural frequencies of the assemblies. A vibration sensor or measurement of current changes of a motor of the operating system can be used to detect vibrations to monitor the characteristic natural frequencies. Torsional oscillations or measurement of current and voltage changes of a motor of the operating system, can also be used to monitor the characteristic natural frequencies.

    摘要翻译: 用于监测轴裂纹或初期小齿轮滑动的诊断技术涉及监测诸如机车的齿轮传动系统的操作系统的特征固有频率的偏移。 该技术涉及监测用于检测轴开裂的轴的特性固有频率或共振的偏移。 该技术还涉及监测操作系统的一个或多个组件的特征固有频率的偏移,其包括小齿轮并且检测组件的一个或多个特征固有频率的偏移。 可以使用振动传感器或操作系统的电机的电流变化的测量来检测振动以监测特征固有频率。 扭转振荡或操作系统电动机的电流和电压变化的测量也可用于监测特征固有频率。

    Adaptive, on line, statistical method and apparatus for motor bearing
fault detection by passive motor current monitoring
    3.
    发明授权
    Adaptive, on line, statistical method and apparatus for motor bearing fault detection by passive motor current monitoring 失效
    自适应,在线,无源电动机电流监测用于电机轴承故障检测的统计方法和装置

    公开(公告)号:US5726905A

    公开(公告)日:1998-03-10

    申请号:US534530

    申请日:1995-09-27

    CPC分类号: G01R31/343 G01M13/04

    摘要: A motor current signal is monitored during a learning stage and divided into a plurality of statistically homogeneous segments representative of good operating modes. A representative parameter and a respective boundary of each segment is estimated. The current signal is monitored during a test stage to obtain test data, and the test data is compared with the representative parameter and the respective boundary of each respective segment to detect the presence of a fault in a motor. Frequencies at which bearing faults are likely to occur in a motor can be estimated, and a weighting function can highlight such frequencies during estimation of the parameter.

    摘要翻译: 在学习阶段监测电动机电流信号,并将其分成代表良好操作模式的多个统计上均匀的段。 估计每个段的代表性参数和相应边界。 在测试阶段监视当前信号以获得测试数据,并将测试数据与代表参数和每个相应段的相应边界进行比较,以检测电机中是否存在故障。 可以估计在马达中可能发生轴承故障的频率,并且加权函数可以在参数估计期间突出显示这些频率。

    Adaptive, on line, statistical method and apparatus for detection of
broken bars in motors by passive motor current monitoring and digital
torque estimation
    5.
    发明授权
    Adaptive, on line, statistical method and apparatus for detection of broken bars in motors by passive motor current monitoring and digital torque estimation 失效
    自适应,在线,统计方法和装置,用于通过无源电动机电流监测和数字转矩估计来检测电动机中的断条

    公开(公告)号:US5742522A

    公开(公告)日:1998-04-21

    申请号:US627721

    申请日:1996-04-01

    摘要: During a learning stage a motor current signal is monitored, and estimated motor torque is used to transform the current signal into a time-frequency spectra including a plurality of segments representative of good operating modes. A representative parameter and a respective boundary of each segment is estimated. The current signal is monitored during a test stage to obtain test data, and the test data is compared with the representative parameter and the respective boundary of each respective segment to detect the presence of a fault in a motor. Frequencies at which broken bar faults are likely to occur in a motor can be estimated using the estimated motor torque, and a weighting function can highlight such frequencies during estimation of the parameter. The current signal can be further subdivided into the segments by monitoring sidebands of the frequency components of current spectrum strips of each segment. Estimating the parameter and the boundary of each segment can include calculating a segment mean (the representative parameter) and variance for each frequency component in each respective segment; calculating a modified Mahalanobis distance for each strip of each respective segment; and for each respective segment, using respective modified Mahalanobis distances to calculate a respective radius about a respective segment mean to define the respective boundary.

    摘要翻译: 在学习阶段期间,监视电动机电流信号,并且使用估计的电动机转矩将电流信号变换为包括表示良好操作模式的多个段的时间频谱。 估计每个段的代表性参数和相应边界。 在测试阶段监视当前信号以获得测试数据,并将测试数据与代表参数和每个相应段的相应边界进行比较,以检测电机中是否存在故障。 可以使用估计的电动机转矩来估计电动机中可能发生断线故障的频率,并且加权函数可以在估计参数期间突出显示这些频率。 通过监测每个段的当前频谱带的频率分量的边带,可以将当前信号进一步细分为段。 估计每个段的参数和边界可以包括计算每个相应段中的每个频率分量的段平均值(代表参数)和方差; 计算每个相应段的每个条的修改的马氏距离; 并且对于每个相应的段,使用相应的修改的马氏距离来计算关于相应段平均值的相应半径以限定相应的边界。

    Electric machine monitoring method and system
    9.
    发明授权
    Electric machine monitoring method and system 失效
    电机监控方法及系统

    公开(公告)号:US06496782B1

    公开(公告)日:2002-12-17

    申请号:US09699089

    申请日:2000-10-30

    IPC分类号: G06E1900

    CPC分类号: G05B23/0221

    摘要: A machine monitoring method includes obtaining signals indicative of machine conditions, machine rotational speed, direction, and load conditions over a segment of time, transforming the obtained signal indicative of machine conditions into a frequency spectrum, identifying low level features of the frequency spectrum, and processing the low level features to obtain an indicator value representative of the machine conditions.

    摘要翻译: 一种机器监视方法包括:获取表示机器状态,机器转速,方向和负载状况的信号,将所获得的指示机器状况的信号变换成频谱,识别频谱的低级特征;以及 处理低级特征以获得代表机器条件的指标值。

    Power generator
    10.
    发明授权
    Power generator 失效
    发电机

    公开(公告)号:US06462457B2

    公开(公告)日:2002-10-08

    申请号:US09749062

    申请日:2000-12-27

    IPC分类号: H02K112

    摘要: A power generator that operates at a reduced keybar voltages and currents, flange currents, and keybar voltage differentials includes a keybar shield that reduces the amount of magnetic flux coupling into a keybar of multiple keybars during operation of the generator. By reducing the amount of coupled flux, the keybar shield reduces a keybar voltage and a keybar current in a keybar, reduces keybar current flowing into a flange, and reduces a voltage differential between voltages induced by the flux in the multiple keybars.

    摘要翻译: 在减少的键盘电压和电流,法兰电流和键槽电压差下工作的发电机包括一个键槽屏蔽,其减少了在发电机运行期间耦合到多个键盘的键槽中的磁通量。 通过减少耦合磁通量,键盘屏蔽减少了键槽中的键槽电压和键槽电流,减少了流入法兰的键槽电流,并降低了由多个键盘中的磁通引起的电压之间的电压差。