Crack estimation device, failure diagnosis device, crack estimation method, and failure diagnosis method for rotating machine

Patent metadata

Field	Value
Publication number	US-2023049804-A1
Application number	US-202017794271-A
Country	US
Kind code	A1
Filing date	Jan 31, 2020
Priority date	Jan 31, 2020
Publication date	Feb 16, 2023
Grant date	—

Abstract

Provided are a shape model setting circuitry for setting a shape model of a target structure, a crack candidate plane in the shape model, and an observation plane of the shape model, an estimation model generator for generating an estimation model obtained from a numerical analysis of a structural analysis model by sequentially changing a boundary condition of the crack candidate plane in the structural analysis model generated from the shape model, and a crack state analyzer for estimating 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 the application of an observation plane deformation vector indicating deformation of the observation plane obtained from measurement values, the estimation model, and a latent variable indicating presence or absence of the crack in the crack candidate plane.

First claim

1 .- 14 . (canceled)

15 . A crack estimation device, comprising:
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 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.

16 . The crack estimation device according to claim 15 , wherein the crack state analyzer determines 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 the 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.

17 . The crack estimation device according to claim 15 , wherein a Bayesian estimation is used for the probabilistic inference.

18 . The crack estimation device according to claim 15 , wherein any one of a displacement change, a strain change, and an angle change of the observation plane is used for the observation plane deformation vector.

19 . The crack estimation device according to claim 15 , wherein
the external force is an inspection load applied at a time of inspection of the target structure; and an inspection load setting circuitry to set a position and a magnitude of the load and an inspection load indicator to display the position and the magnitude of the set inspection load at the time of inspection are further provided.

20 . A failure diagnosis device, comprising:
a crack estimation device according to claim 15 , 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; 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.

21 . A failure diagnosis device, comprising:
a crack estimation device according to claim 16 , 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; 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.

22 . A failure diagnosis device, comprising:
a crack estimation device according to claim 15 , 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; and a terminal to receive member information containing force applied to the target structure during operation of equipment having the target structure and physical properties of a material constituting the target structure, to output the received member information to the crack estimation device, and to display an analysis result of the crack estimation device, wherein the crack state analyzer determines a propagation lifetime of the crack from the size and the position of the crack that are obtained and the member information and displays information on a remaining period of use on the terminal.

23 . A failure diagnosis device, comprising:
a crack estimation device according to claim 16 , 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; and a terminal to receive member information containing force applied to the target structure during operation of equipment having the target structure and physical properties of a material constituting the target structure, to output the received member information to the crack estimation device, and to display an analysis result of the crack estimation device, wherein the crack state analyzer determines a propagation lifetime of the crack from the size and the position of the crack that are obtained and the member information and displays information on a remaining period of use on the terminal.

24 . A crack estimation method, comprising:
a shape model setting step of setting 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 generation step of generating 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; a step of receiving actual measurement values of the observation plane; and a crack state analysis step of estimating a position and a size of the crack by obtaining 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 the deformation of the observation plane obtained from the measurement values, the matrix, and a latent variable indicating presence or absence of the crack in the crack candidate plane.

25 . The crack estimation method according to claim 24 , wherein
in the crack state analysis step, a probability distrib

Assignees

• Mitsubishi Electric Corp

Inventors

• Hana Norihiko
• Akiyoshi Masao
• Amaya Kenji

Classifications

• G01M5/0016

  of aircraft wings or blades · CPC title

• G01M5/0033 Primary

  by determining damage, crack or wear · CPC title

• G01M5/0083

  by measuring variation of impedance, e.g. resistance, capacitance, induction · CPC title

• G01N2203/0066

  Propagation of crack · CPC title

• G01N2203/0212

  Theories, calculations · CPC title