Dynamic environmental change compensation of sensor data in structural health monitoring systems
First Claim
1. A method for adjusting sensor signal data detected in a structural health monitoring (SHM) system to compensate for the effects of an environmental variable acting on the data, the method comprising:
- detecting one or more sets of a sensor signal data from an array of transducers mounted on a structure being monitored by the SHM system;
constructing a baseline data space comprising the one or more sets of the sensor signal data detected;
detecting one or more current sets of the sensor signal data from the transducers at a later time at which the environmental variable is acting to affect the data;
amending the baseline data space with the current sensor signal data sets while they are being detected; and
,determining if the current sensor signal exceeds a selected threshold value on the basis of the amended baseline data space; and
repeating the detecting one or more current sets of the sensor signal data, the amending, and the determining for each of a plurality of signal propagation paths in the structure respectively extending between associated pairs of the transducers.
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Abstract
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.
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Citations
15 Claims
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1. A method for adjusting sensor signal data detected in a structural health monitoring (SHM) system to compensate for the effects of an environmental variable acting on the data, the method comprising:
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detecting one or more sets of a sensor signal data from an array of transducers mounted on a structure being monitored by the SHM system; constructing a baseline data space comprising the one or more sets of the sensor signal data detected; detecting one or more current sets of the sensor signal data from the transducers at a later time at which the environmental variable is acting to affect the data; amending the baseline data space with the current sensor signal data sets while they are being detected; and
,determining if the current sensor signal exceeds a selected threshold value on the basis of the amended baseline data space; and repeating the detecting one or more current sets of the sensor signal data, the amending, and the determining for each of a plurality of signal propagation paths in the structure respectively extending between associated pairs of the transducers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification