利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

24 条记录 (耗时 0.039 秒)

    DETECTING DAMAGE IN METAL STRUCTURES WITH STRUCTURAL HEALTH MONITORING SYSTEMS
    1.
    发明申请
    DETECTING DAMAGE IN METAL STRUCTURES WITH STRUCTURAL HEALTH MONITORING SYSTEMS 有权
    用结构健康监测系统检测金属结构中的损伤

    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。

    Method and apparatus for loosening of fasteners on structures
    2.
    发明授权
    Method and apparatus for loosening of fasteners on structures 有权
    在结构上松动紧固件的方法和装置

    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。

    Method and apparatus for detecting damage in armor structures
    3.
    发明授权
    Method and apparatus for detecting damage in armor structures 有权
    检测装甲结构损伤的方法和装置

    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。

    METHOD AND APPARATUS FOR LOOSENING OF FASTENERS ON STRUCTURES
    4.
    发明申请
    METHOD AND APPARATUS FOR LOOSENING OF FASTENERS ON STRUCTURES 有权
    用于松紧结构件的方法和装置

    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。

    METHOD AND APPARATUS FOR DETECTING DAMAGE IN ARMOR STRUCTURES
    5.
    发明申请
    METHOD AND APPARATUS FOR DETECTING DAMAGE IN ARMOR STRUCTURES 有权
    检测铠装结构损伤的方法和装置

    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。

    Detecting damage in metal structures with structural health monitoring systems
    8.
    发明授权
    Detecting damage in metal structures with structural health monitoring systems 有权
    用结构健康监测系统检测金属结构的损伤

    公开(公告)号：US07908095B2

    公开(公告)日：2011-03-15

    申请号：US12102767

    申请日：2008-04-14

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

    发明人： Paul B. 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进行匹配，基于其相应的信号能量，为匹配的提取的电流和基线信号分量中的每一个计算相应的索引IS0和IA0， 如果结构的多个相邻传感器路径的索引IS0和IA0中的任一个大于所选择的阈值，则结构中的损坏。