US 12,001,195 B2
State evaluation system, state evaluation apparatus, and state evaluation method
Yoshinori Mori, Kawasaki (JP); Hidefumi Takamine, Shinagawa (JP); Kazuo Watabe, Yokohama (JP); and Hayato Toda, Fuji (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Carrier Corporation, Kawasaki (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Carrier Corporation, Kawasaki (JP)
Filed on Sep. 8, 2021, as Appl. No. 17/447,087.
Application 17/447,087 is a continuation of application No. PCT/JP2020/031830, filed on Aug. 24, 2020.
Claims priority of application No. 2020-033336 (JP), filed on Feb. 28, 2020.
Prior Publication US 2021/0397161 A1, Dec. 23, 2021
Int. Cl. G05B 19/418 (2006.01)
CPC G05B 19/4184 (2013.01) [G05B 19/4183 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A state evaluation system comprising:
a sensor configured to detect elastic waves which are generated from industrial equipment in operation;
a filter configured to be passable elastic waves having frequency characteristics based on damage which is generated in the industrial equipment;
a signal processor configured to extract a plurality of feature values using the elastic waves passing through the filter; and
an evaluator configured to evaluate an abnormality of the industrial equipment on the basis of a combination of the extracted plurality of feature values, wherein
the evaluator is configured to
generate a scatter diagram indicating a correlation between energy and duration of the elastic waves when the energy and the duration of the elastic waves are used as the plurality of feature values,
draw an approximate straight line on the generated scatter diagram, the approximate straight line being derived from a correlation between the plurality of feature values acquired from the elastic waves, and
determine that the abnormality of the industrial equipment exists using the elastic waves, when a proportion deviating from the approximate straight line, which is derived from the correlation between the plurality of feature values acquired from the elastic waves, is equal to or greater than a threshold value.