State detection apparatus
AssigneeHitachi, Ltd.
InventorsTakashi Oshima, Keisuke Yamamoto, Goichi Ono
Life of this patent
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Abstract
The time-series signal of the sensor is transformed to the spectral intensity by fast Fourier transform (FFT) or the like, and the one-dimensional data of the spectral intensity is generated. A pseudo image is generated, for example, by repeatedly arranging the one-dimensional data in the vertical direction, or by arranging the one-dimensional data for a plurality of sensors in the vertical direction. The state of the facility is identified by analyzing the pseudo image with an image analysis unit such as a convolutional neural network.
Claims19
A state detection apparatus comprising:
- a plurality of sensors;
- and
- a processing apparatus coupled with the plurality of sensors and configured to execute data processing operations comprising
- transforming data of a plurality of digitized time-series signals each associated with one of the plurality of sensors into data relating to spectral intensity comprising a spectral intensity vector for each of the digitized time-series signals;
- quantizing each spectral intensity vector into a quantized spectral intensity vector;
- generating a pseudo image based on the data relating to the spectral intensity by generating a two-dimensional image by arranging each quantized spectral intensity vector corresponding to one of the plurality of sensors as one or more rows in a vertical direction;
- and
- analyzing the pseudo image and outputting a classification result of a state of a facility based on the analysis of the pseudo image,
- wherein a width in pixels of the generated pseudo image is equal to a number of dimensions of the quantized spectral intensity vector,
- wherein a vertical size of the pseudo image in a number of pixels is equal to a product of the number of sensors and a number of the one or more rows, and
- wherein a pixel value of the pseudo image is equivalent to a frequency spectral intensity of the digitized time-series signal of the sensor such that the pseudo image is independent of a phase of the digitized time-series signal.
A state detection apparatus comprising:
- a sensor;
- and
- a processing apparatus coupled with the sensor and configured to execute data processing operations comprising
- transforming data of the digitized time-series signals of the sensor into data relating to spectral intensity comprising a spectral intensity vector for each of the digitized time-series signals;
- generating a pseudo image based on the data relating to the spectral intensity by generating a two-dimensional image by arranging each spectral intensity vector as one or more rows in a vertical direction;
- and
- analyzing the pseudo image and outputting a classification result of a state of a facility based on the analysis of the pseudo image,
- wherein a width in pixels of the generated pseudo image is equal to a number of dimensions of the spectral intensity vector,
- wherein a vertical size of the pseudo image in a number of pixels is equal to a product of the sensor and a number of the one or more rows, and
- wherein a pixel value of the pseudo image is equivalent to a frequency spectral intensity of the digitized time-series signal of the sensor such that the pseudo image is independent of a phase of the digitized time-series signal.
Dependencies are inferred from the claim text.