Adaptive, on line, statistical method and apparatus for motor bearing
fault detection by passive motor current monitoring
    2.
    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。

    Gear transmission condition monitoring method and apparatus
    3.
    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。

    Adaptive, on line, statistical method and apparatus for detection of
broken bars in motors by passive motor current monitoring and digital
torque estimation
    4.
    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。

    Image processing method and apparatus including image improving circuit
    5.
    发明授权
    Image processing method and apparatus including image improving circuit 失效
    包括图像改善电路的图像处理方法和装置

    公开(公告)号:US06778692B1

    公开(公告)日:2004-08-17

    申请号:US09636687

    申请日:2000-08-11

    申请人: Birsen Yazici

    发明人: Birsen Yazici

    IPC分类号: G06K900

    摘要: A method of improving images is provided. A body of image data is collected and signal to noise (SNR) values thereof are determined. The collected data is converted into an electronic image representation X. Image X comprises a first array of pixel intensity values. Further, a low pass filtered image representation F comprising a second array of pixel intensity values is obtained. An improved electronic image representation P comprising a third array of pixel intensity values is generated by replacing each pixel intensity value of electronic image representation X by a linear combination of the replaced pixel intensity value from image X and the corresponding pixel intensity value from image F. An array of linear combination coefficients &agr;, (1−&agr;) determine the relative contributions of the replaced X pixel intensity value and the value of the corresponding pixel intensity from image F, respectively. The values of linear combination coefficients array &agr; are determined with respect to statistical image quality metrics, in particular with respect to signal-to-noise (SNR) ratio.

    摘要翻译: 提供了一种改善图像的方法。 收集一组图像数据,确定其信噪比(SNR)值。 所收集的数据被转换成电子图像表示X.图像X包括像素强度值的第一阵列。 此外,获得包括像素强度值的第二阵列的低通滤波图像表示F. 通过用来自图像X的替换的像素强度值和来自图像F的对应像素强度值的线性组合替换电子图像表示X的每个像素强度值来生成包括第三阵列的像素强度值的改进的电子图像表示P. 线性组合系数α(1-α)的阵列分别确定替换的X像素强度值和来自图像F的相应像素强度的值的相对贡献。 关于统计图像质量度量,特别是关于信噪比(SNR)比率,确定线性组合系数阵列α的值。

    Fourier spectrum method to remove grid line artifacts without changing the diagnostic quality in X-ray images
    6.
    发明授权
    Fourier spectrum method to remove grid line artifacts without changing the diagnostic quality in X-ray images 失效
    傅立叶频谱方法去除网格线伪影而不改变X射线图像的诊断质量

    公开(公告)号:US06333990B1

    公开(公告)日:2001-12-25

    申请号:US09088670

    申请日:1998-06-02

    IPC分类号: G06K900

    摘要: A method for removing “grid line artifacts” from x-ray images without changing the diagnostic quality of the x-ray image is presented. The method utilizes the Fourier spectrum of the image to detect the grid line frequencies and employs spectral domain filtering to remove the grid line spectral components. The diagnostic information is preserved by modifying the grid line spectral components to be indistinguishable from local variations in image intensity values, and edge density of the x-ray image.

    摘要翻译: 提出了从X射线图像中去除“网格线伪像”而不改变X射线图像的诊断质量的方法。 该方法利用图像的傅立叶频谱检测网格线频率,并采用频域滤波去除网格线谱分量。 通过将网格线谱分量修改为与图像强度值的局部变化和x射线图像的边缘密度无关来保留诊断信息。

    Statistical pattern analysis methods of partial discharge measurements
in high voltage insulation
    8.
    发明授权
    Statistical pattern analysis methods of partial discharge measurements in high voltage insulation 失效
    高压绝缘中局部放电测量的统计模式分析方法

    公开(公告)号:US6088658A

    公开(公告)日:2000-07-11

    申请号:US837932

    申请日:1997-04-11

    IPC分类号: G01R31/12 G01R31/08

    CPC分类号: G01R31/1227 G01R31/1272

    摘要: Statistical methods of partial discharge analysis utilizing histogram similarity measures are provided by quality assessment and condition monitoring methods of evaluating high voltage electrical insulation. The quality assessment method is utilized to evaluate the quality of insulation within the electrical equipment. The condition monitoring method is utilized during normal operation of the equipment to identify degradation in the insulation and to predict catastrophic insulation failures.

    摘要翻译: 利用直方图相似性测量法进行局部放电分析的统计方法由评估高压电气绝缘的质量评估和状态监测方法提供。 质量评估方法用于评估电气设备内的绝缘质量。 在设备的正常运行期间利用状态监测方法来识别绝缘中的劣化并预测灾难性绝缘故障。

    PATIENT-SPECIFIC ORGAN DOSE QUANTIFICATION AND INVERSE OPTIMIZATION FOR CT

    公开(公告)号:US20230065196A1

    公开(公告)日:2023-03-02

    申请号:US17796715

    申请日:2021-02-01

    摘要: In one embodiment, there is provided a method of optimizing image quality and organ dose for computed tomography (CT). The method includes segmenting, by an organ segmentation module, at least one organ based, at least in part, on patient image data. The method further includes determining, by a Monte Carlo dose module, a patient-specific heterogeneous dose based, at least in part, on the patient image data and based, at least in part, on a selected CT scanner data. The method further includes determining, by a patient-specific organ dose module, a patient-specific nominal organ dose for each segmented organ based, at least in part, on the patient-specific heterogeneous dose. The method further includes determining, by an inverse optimization module, at least one CT scanner parameter configured to optimize image quality and a selected patient-specific organ dose of at least one selected organ.

    Digital current differential system
    10.
    发明授权
    Digital current differential system 失效
    数字电流差动系统

    公开(公告)号:US06311307B1

    公开(公告)日:2001-10-30

    申请号:US09104760

    申请日:1998-06-25

    IPC分类号: G06F1100

    摘要: A method of detecting faults on a power transmission line system includes simultaneously measuring phase current samples at each phase of each transmission terminal; calculating real and imaginary phaselets comprising partial sums of the phase current samples; for each phaselet, calculating a respective partial sum of squares of each phase current sample; calculating the sums of the real and imaginary phaselets over a variable size sliding sample window; calculating real and imaginary phasor components from the phaselets and a sum of the partial sums of the squares over the sample window; using the sums of the real and imaginary phaselets, the real and imaginary phasor components, and the sum of the partial sums of the squares to calculate a sum of squares of errors between the phase current samples and a fitted sine wave representative of the real and imaginary phasor components; using the sum of squares of errors to calculate a variance matrix defining an elliptical uncertainty region; determining whether a disturbance has occurred, and, if so, re-initializing the sample window; and determining whether a sum of current phasors from each terminal for a respective phase falls outside of the elliptical uncertainty region for the respective phase.

    摘要翻译: 一种检测输电线路系统故障的方法,包括同时测量每个发送终端各相的相电流采样; 计算包括所述相电流样本的部分和的实部和虚拟相位元; 对于每个阶段,计算每个相电流样本的相应部分平方和; 在可变尺寸的滑动样本窗口上计算实数和虚拟相位的和; 从相位图计算实部和虚部相量分量,以及样本窗口上的平方的部分和的总和; 使用实数和虚拟相位的总和,实相和虚相量分量,以及平方的部分和的和来计算相电流采样和拟合的正弦波之间的平方和之和,所述拟合正弦波表示实数和 假想相量分量; 使用误差平方和来计算定义椭圆不确定区域的方差矩阵; 确定是否发生干扰,如果是,则重新初始化样本窗口; 以及确定来自各个相位的每个终端的电流相量的和是否落在相位相位的椭圆不确定区域之外。