公开(公告)号：US20080255778A1

公开(公告)日：2008-10-16

申请号：US12102767

申请日：2008-04-14

申请人： Bao Liu ,  Fu-Kuo Chang ,  Shawn J. Beard ,  Irene Li

发明人： Bao Liu ,  Fu-Kuo Chang ,  Shawn J. Beard ,  Irene Li

IPC分类号： G06F19/00

CPC分类号： G01N29/041 ,  G01N29/36 ,  G01N29/4463 ,  G01N2291/0427 ,  G01N2291/106

摘要： A method useful in structural health monitoring (SHM) systems for detecting damages in metal structures includes extracting the zero-order symmetric and anti-symmetric mode signal components from each of a plurality of current sensor signals of an array of transducers mounted on the structure, matching the extracted signal components with corresponding signal components of a plurality of baseline sensor signals previously detected in the structure, computing respective indices IS0 and IA0 for each of the matched extracted current and baseline signal components based on respective signal energies thereof, and determining the presence of a damage in the structure if either of the indices IS0 and IA0 of a plurality of neighboring sensor paths of the structure is greater than a selected threshold value.

摘要翻译： 在用于检测金属结构中的损伤的结构健康监测（SHM）系统中有用的方法包括从安装在结构上的换能器阵列的多个电流传感器信号中的每一个提取零级对称和反对称模式信号分量， 将所提取的信号分量与先前在结构中检测到的多个基线传感器信号的相应信号分量相匹配，为每个匹配提取的每个匹配提取出的信号分量计算相应的索引I S0和I A0 < 基于其各自的信号能量的电流和基线信号分量，并且如果多个信号中的任何一个索引I 0和I A 0 <0，则确定结构中是否存在损坏 结构的相邻传感器路径大于所选择的阈值。

公开(公告)号：US08229680B2

公开(公告)日：2012-07-24

申请号：US12432659

申请日：2009-04-29

申请人： Bao Liu ,  Lien Ouyang ,  Shawn J. Beard ,  Irene Li ,  Fu-Kuo Chang

发明人： Bao Liu ,  Lien Ouyang ,  Shawn J. Beard ,  Irene Li ,  Fu-Kuo Chang

IPC分类号： G01N29/14

CPC分类号： G01H1/00

摘要： Methods and apparatuses for detecting fastener loosening. Sensors query a structure at a baseline value of an environment variable, such as temperature, and this baseline signal is stored for later use. Subsequently, users can query the structure remotely and at any time, and the signals from these queries are compared to the stored baseline signal. In some embodiments, an index is calculated, and the system determines that one or more fasteners have come loose if the calculated index exceeds a predetermined threshold value. It is desirable to select a time window within which the query signal is most sensitive to fastener loosening but least sensitive to variations in the environment variable. Accordingly, embodiments of the invention include methods and apparatuses for determining an optimal time window for use in calculating the above described index.

摘要翻译： 用于检测紧固件松动的方法和装置。 传感器以环境变量（如温度）的基准值查询结构，并将此基线信号存储供以后使用。 随后，用户可以在任何时间远程查询结构，并将来自这些查询的信号与存储的基线信号进行比较。 在一些实施例中，计算索引，并且如果所计算的索引超过预定阈值，则系统确定一个或多个紧固件已经松动。 期望选择查询信号对紧固件松动最敏感但对环境变量的变化最不敏感的时间窗。 因此，本发明的实施例包括用于确定用于计算上述索引的最佳时间窗口的方法和装置。

公开(公告)号：US20090276168A1

公开(公告)日：2009-11-05

申请号：US12432659

申请日：2009-04-29

申请人： Bao Liu ,  Lien Ouyang ,  Shawn J. Beard ,  Irene Li ,  Fu-Kuo Chang

发明人： Bao Liu ,  Lien Ouyang ,  Shawn J. Beard ,  Irene Li ,  Fu-Kuo Chang

IPC分类号： G01N29/14

CPC分类号： G01H1/00

摘要： Methods and apparatuses for detecting fastener loosening. Sensors query a structure at a baseline value of an environment variable, such as temperature, and this baseline signal is stored for later use. Subsequently, users can query the structure remotely and at any time, and the signals from these queries are compared to the stored baseline signal. In some embodiments, an index is calculated, and the system determines that one or more fasteners have come loose if the calculated index exceeds a predetermined threshold value. It is desirable to select a time window within which the query signal is most sensitive to fastener loosening but least sensitive to variations in the environment variable. Accordingly, embodiments of the invention include methods and apparatuses for determining an optimal time window for use in calculating the above described index.

摘要翻译： 用于检测紧固件松动的方法和装置。 传感器以环境变量（如温度）的基准值查询结构，并将此基线信号存储供以后使用。 随后，用户可以在任何时间远程查询结构，并将来自这些查询的信号与存储的基线信号进行比较。 在一些实施例中，计算索引，并且如果所计算的索引超过预定阈值，则系统确定一个或多个紧固件已经松动。 期望选择查询信号对紧固件松动最敏感但对环境变量的变化最不敏感的时间窗。 因此，本发明的实施例包括用于确定用于计算上述索引的最佳时间窗口的方法和装置。

公开(公告)号：US20080255775A1

公开(公告)日：2008-10-16

申请号：US11952936

申请日：2007-12-07

申请人： Shawn J. Beard ,  Bao Liu ,  Fu-Kuo Chang

发明人： Shawn J. Beard ,  Bao Liu ,  Fu-Kuo Chang

IPC分类号： G06F19/00 ,  G06F15/00

CPC分类号： G01N29/041 ,  G01N29/36 ,  G01N29/4463 ,  G01N2291/0427 ,  G01N2291/106

摘要： A method and system of compensating for environmental effect when detecting signals using a structural health monitoring system includes collecting baseline data signals for one or more values of the environmental effect variable from signals transmitted along selected paths between transducers in an array attached to the structure. A threshold is selected based on the baseline data for determining if the signal is detected. Current data signals are collected and matched to the best fit baseline data. The value of the environmental effect variable is determined on the basis of the matching. A signal is detected according to the selected threshold.

摘要翻译： 一种在使用结构健康监测系统检测信号时补偿环境影响的方法和系统包括从附接到结构的阵列中的选择的路径之间沿着选定路径传输的信号收集环境影响变量的一个或多个值的基线数据信号。 基于用于确定是否检测到信号的基线数据来选择阈值。 收集当前数据信号并与最佳拟合基线数据匹配。 根据匹配度确定环境影响变量的值。 根据所选择的阈值检测信号。

公开(公告)号：US08036836B2

公开(公告)日：2011-10-11

申请号：US12104354

申请日：2008-04-16

申请人： Bao Liu ,  Shawn J. Beard ,  Fu-Kuo Chang

发明人： Bao Liu ,  Shawn J. Beard ,  Fu-Kuo Chang

IPC分类号： G01B3/00

CPC分类号： G01N29/041 ,  G01N29/36 ,  G01N29/4463 ,  G01N2291/0427 ,  G01N2291/106

摘要： A method for adjusting signal data detected in a structural health monitoring (SHM) system to compensate for the effects of environmental variables acting thereon includes constructing a baseline data space comprised of sets of signal data. Current signal data sets are collected for comparison to the baseline data space. The collected current signal data sets are amended to best match baseline signal data sets in the baseline data space. A set of indices are computed for comparing the amended current signal data set to the baseline signal data sets. A threshold for detection is determined by outlier detection for the computed indices. A signal in the collected signal data set is determined to be detected on the basis of the threshold. A representation of the detected signal strength is provided on the basis of the computed indices.

摘要翻译： 一种用于调整在结构健康监测（SHM）系统中检测的信号数据以补偿其上作用的环境变量的影响的方法包括构建由信号数据集合组成的基线数据空间。 收集当前信号数据集，以便与基线数据空间进行比较。 所收集的当前信号数据集被修改以最佳地匹配基线数据空间中的基线信号数据集。 计算一组索引，用于将经修改的当前信号数据集与基线信号数据集进行比较。 用于检测的阈值由所计算的索引的异常值检测确定。 确定收集的信号数据组中的信号根据该阈值进行检测。 基于计算出的索引提供检测信号强度的表示。

公开(公告)号：US07809513B2

公开(公告)日：2010-10-05

申请号：US11952936

申请日：2007-12-07

申请人： Shawn J. Beard ,  Bao Liu ,  Fu-Kuo Chang

发明人： Shawn J. Beard ,  Bao Liu ,  Fu-Kuo Chang

IPC分类号： G01N17/00 ,  G01N25/00 ,  G01M19/00 ,  G01D21/00 ,  G01H17/00 ,  G06F19/00 ,  G06F17/40

CPC分类号： G01N29/041 ,  G01N29/36 ,  G01N29/4463 ,  G01N2291/0427 ,  G01N2291/106

摘要： A method and system of compensating for environmental effect when detecting signals using a structural health monitoring system includes collecting baseline data signals for one or more values of the environmental effect variable from signals transmitted along selected paths between transducers in an array attached to the structure. A threshold is selected based on the baseline data for determining if the signal is detected. Current data signals are collected and matched to the best fit baseline data. The value of the environmental effect variable is determined on the basis of the matching. A signal is detected according to the selected threshold.

摘要翻译： 一种在使用结构健康监测系统检测信号时补偿环境影响的方法和系统包括从附接到结构的阵列中的选择的路径之间沿着选定路径传输的信号收集环境影响变量的一个或多个值的基线数据信号。 基于用于确定是否检测到信号的基线数据来选择阈值。 收集当前数据信号并与最佳拟合基线数据匹配。 根据匹配度确定环境影响变量的值。 根据所选择的阈值检测信号。

公开(公告)号：US20080255774A1

公开(公告)日：2008-10-16

申请号：US12104354

申请日：2008-04-16

申请人： Bao Liu ,  Shawn J. Beard ,  Fu-Kuo Chang

发明人： Bao Liu ,  Shawn J. Beard ,  Fu-Kuo Chang

IPC分类号： G06F17/18 ,  G06F19/00

CPC分类号： G01N29/041 ,  G01N29/36 ,  G01N29/4463 ,  G01N2291/0427 ,  G01N2291/106

摘要： A method for adjusting signal data detected in a structural health monitoring (SHM) system to compensate for the effects of environmental variables acting thereon includes constructing a baseline data space comprised of sets of signal data. Current signal data sets are collected for comparison to the baseline data space. The collected current signal data sets are amended to best match baseline signal data sets in the baseline data space. A set of indices are computed for comparing the amended current signal data set to the baseline signal data sets. A threshold for detection is determined by outlier detection for the computed indices. A signal in the collected signal data set is determined to be detected on the basis of the threshold. A representation of the detected signal strength is provided on the basis of the computed indices.

摘要翻译： 一种用于调整在结构健康监测（SHM）系统中检测的信号数据以补偿其上作用的环境变量的影响的方法包括构建由信号数据集合组成的基线数据空间。 收集当前信号数据集，以便与基线数据空间进行比较。 所收集的当前信号数据集被修改以最佳地匹配基线数据空间中的基线信号数据集。 计算一组索引，用于将经修改的当前信号数据集与基线信号数据集进行比较。 用于检测的阈值由所计算的索引的异常值检测确定。 确定收集的信号数据组中的信号根据该阈值进行检测。 基于计算出的索引提供检测信号强度的表示。

公开(公告)号：US08046177B2

公开(公告)日：2011-10-25

申请号：US12060799

申请日：2008-04-01

申请人： Bao Liu ,  Irene Li ,  Fu-Kuo Chang

发明人： Bao Liu ,  Irene Li ,  Fu-Kuo Chang

IPC分类号： G01B5/28 ,  G01M3/00

CPC分类号： G01N29/041 ,  G01N29/36 ,  G01N29/4463 ,  G01N2291/0427 ,  G01N2291/106

摘要： Detection of damage in armor structures, using networks of piezoelectric transducers. In particular, piezoelectric transducers can be placed at various points on the armor structure, effectively creating a number of paths between pairs of transducers. Each of these paths can be queried by transmitting an ultrasonic stress wave from one transducer to the other, and analyzing changes in the stress wave. The signal from the received stress wave can be time gated to remove crosstalk, and the resulting time gated signal can be analyzed for characteristics of damage. For instance, if the time gated signal is sufficiently attenuated, it can be determined that the armor structure has sustained damage to at least that region traversed by this particular path.

摘要翻译： 使用压电换能器网络检测装甲结构中的损伤。 特别地，压电换能器可以放置在装甲结构上的各个点上，有效地在成对的换能器之间产生多个路径。 通过将超声应力波从一个换能器传递到另一个换能器，并分析应力波的变化，可以查询这些路径中的每一个。 来自接收的应力波的信号可以被时间选通以消除串扰，并且可以分析所得到的时间门控信号的损伤特性。 例如，如果时间门控信号被充分衰减，则可以确定装甲结构至少受到该特定路径穿过的区域的持续损坏。

公开(公告)号：US20090043516A1

公开(公告)日：2009-02-12

申请号：US12060799

申请日：2008-04-01

申请人： Bao Liu ,  Irene Li ,  Fu-Kuo Chang

发明人： Bao Liu ,  Irene Li ,  Fu-Kuo Chang

IPC分类号： G01B5/28

CPC分类号： G01N29/041 ,  G01N29/36 ,  G01N29/4463 ,  G01N2291/0427 ,  G01N2291/106

摘要： Detection of damage in armor structures, using networks of piezoelectric transducers. In particular, piezoelectric transducers can be placed at various points on the armor structure, effectively creating a number of paths between pairs of transducers. Each of these paths can be queried by transmitting an ultrasonic stress wave from one transducer to the other, and analyzing changes in the stress wave. The signal from the received stress wave can be time gated to remove crosstalk, and the resulting time gated signal can be analyzed for characteristics of damage. For instance, if the time gated signal is sufficiently attenuated, it can be determined that the armor structure has sustained damage to at least that region traversed by this particular path.

摘要翻译： 使用压电换能器网络检测装甲结构中的损伤。 特别地，压电换能器可以放置在装甲结构上的各个点上，有效地在成对的换能器之间产生多个路径。 通过将超声应力波从一个换能器传递到另一个换能器，并分析应力波的变化，可以查询这些路径中的每一个。 来自接收的应力波的信号可以被时间选通以消除串扰，并且可以分析所得到的时间门控信号的损伤特性。 例如，如果时间门控信号被充分衰减，则可以确定装甲结构至少受到该特定路径穿过的区域的持续损坏。

公开(公告)号：US20080253231A1

公开(公告)日：2008-10-16

申请号：US12103562

申请日：2008-04-15

申请人： Zengpin Yu ,  Bao Liu ,  Shawn J. Beard ,  David C. Zhang

发明人： Zengpin Yu ,  Bao Liu ,  Shawn J. Beard ,  David C. Zhang

IPC分类号： H04B11/00

CPC分类号： G01N29/041 ,  G01N29/36 ,  G01N29/4463 ,  G01N2291/0427 ,  G01N2291/106

摘要： A method for optimizing transducer performance in an array of transducers in a structural health monitoring system includes specifying a plurality of paths between pairs of the transducers on a monitored structure and evaluating the quality of signal transmissions along the paths so as to optimize the gain and frequency operating condition of the transducers.

摘要翻译： 用于优化结构健康监测系统中的换能器阵列中的换能器性能的方法包括在被监测的结构上指定成对的换能器之间的多个路径并且评估沿着路径的信号传输的质量，以便优化增益和频率 传感器的工作状态。