US 12,442,738 B2
Crack estimation device, failure diagnosis device, crack estimation method, and failure diagnosis method for rotating machine
Norihiko Hana, Tokyo (JP); Masao Akiyoshi, Tokyo (JP); and Kenji Amaya, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/794,271
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jan. 31, 2020, PCT No. PCT/JP2020/003592
§ 371(c)(1), (2) Date Jul. 21, 2022,
PCT Pub. No. WO2021/152811, PCT Pub. Date Aug. 5, 2021.
Prior Publication US 2023/0049804 A1, Feb. 16, 2023
Int. Cl. G01N 3/08 (2006.01)
CPC G01N 3/08 (2013.01) [G01N 2203/0017 (2013.01); G01N 2203/0066 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A failure diagnosis device, comprising:
a crack estimation device including
a shape model setting circuitry to set a shape model of a target structure to be inspected to which an external force is applied, a crack candidate plane in which a crack is expected to occur in a portion hidden from surfaces of the shape model, and an observation plane to be measured among the surfaces of the shape model,
an estimation model generator to generate a matrix for estimating a state of the crack candidate plane from a state of the observation plane using matrices for associating the state of the crack candidate plane with the state of the observation plane, the matrices being obtained by a numerical analysis of a structural analysis model generated from the shape model, and
a crack state analyzer to estimate a position and a size of the crack by obtaining a distribution of load and displacement in the crack candidate plane at the same time by probabilistic inference through application of an observation plane deformation vector indicating deformation of the observation plane obtained from actual measurement values of the observation plane, the matrix, and a latent variable indicating presence or absence of the crack in the crack candidate plane, the crack state analyzer outputting the position and size of the crack estimated, the crack estimation device being connected to a measuring instrument for measuring the observation plane of the target structure and including the measurement data acquisition circuitry which obtains the measurement values from the measuring instrument,
the crack state analyzer determining the size and the position of the crack from a posterior distribution at a time when the posterior distribution is updated and converged via the latent variable, a prior distribution being defined to be a probability distribution of the displacement of the crack candidate plane obtained at the same time with the load via the latent variable showing sparsity of the displacement and the load having reciprocity, the posterior distribution being defined to be a probability distribution of displacement of the observation plane calculated from the prior distribution and the matrix; and
a terminal to receive information on a limit condition of a crack in the target structure, to output the received information on the limit condition to the crack estimation device, and to display an analysis result of the crack estimation device, wherein
the crack state analyzer determines whether or not the size and the position of the crack that are obtained exceed the limit condition and displays a failure occurrence warning on the terminal if the size and the position exceed the limit condition.