METHOD FOR OPERATING A COMPONENT THAT IS CYCLICALLY LOADED DURING OPERATION

• US 20190317487A1
• Filed: 11/02/2017
• Published: 10/17/2019
• Est. Priority Date: 11/09/2016
• Status: Active Grant

• Current Assignee: Siemens Energy Global GmbH & Co. KG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Gottschalk, Hanno, Saadi, Mohamed, Schmitz, Sebastian
• Granted Patent: US 11,119,471 B2
• Time in Patent Office: Days
• CPC Class Codes: G01B 11/005 coordinate measuring machines
• CPC Class Codes: G01B 11/2441 using interferometry
• CPC Class Codes: G01M 15/14 Testing gas-turbine engines or jet-propulsion engines
• CPC Class Codes: G05B 2219/24074 Probability of defect, seriosity or severity of defect, fault
• CPC Class Codes: G05B 23/024 Quantitative history assessment, e.g. mathematical relationships between available data; Functions therefor; Principal component analysis [PCA]; Partial least square [PLS]; Statistical classifiers, e.g. Bayesian networks, linear regression or correlation analysis; Neural networks
• CPC Class Codes: G06F 30/23 using finite element methods [FEM] or finite difference methods [FDM]
• CPC Class Codes: G06N 7/01 Probabilistic graphical models, e.g. probabilistic networks

Abstract

A method for operating a component of predetermined geometry Ω that is cyclically loaded during operation, wherein a probability of failure P is determined for the component taking account of distributions of failure times, which are caused by deviations in material properties, the component is operated depending on the determined probability of failure P, wherein at least one maintenance time is set for the component, in particular depending on the determined probability of failure P.

Claims

1. A method for operating a component of predetermined geometry Ω

that is cyclically loaded during operation, comprising;

determining a probability of failure P for the component taking account of distributions of failure times, which are caused by deviations in material properties,

operating the component depending on the determined probability of failure P, wherein at least one maintenance time is set for the component, depending on the determined probability of failure P,

wherein the probability of failure P is determined taking additional account of distributions of failure times, which are caused by deviations of the component form from a standard geometry,

wherein data that were obtained by determining the geometry of a predetermined number of representative components by metrology are resorted to for the purposes of taking account of the form deviation from the standard geometry,

wherein the probability of failure P is determined according to the formula

2. The method as claimed in claim 1,

wherein each of the representative components was measured using a coordinate measuring machine or a white light interferometer, for the purposes of determining the geometry of the representative components by metrology.

3. The method as claimed in claim 2,

wherein a set of coordinate points xij was obtained by determining the geometry of the representative components by metrology, where i specifies the respectively measured component and j specifies a respectively measured standard point, wherein the coordinates xj were obtained, from a CAD data record that represents the standard geometry of the components.

4. The method as claimed in claim 3,

wherein the coordinates are chosen as surface mesh points of a finite element analysis mesh.

5. The method as claimed in claim 3,

wherein the mean production process deviation at the point j is determined by

Δ

x_j=(1/n)Σ

_i(x_ij−

x_i)=(1/n)Σ

_iΔ

x_ij

and the covariance matrix of the deviations is determined by

c_jk=(1/(n−

1))(1/n)Σ

_i(Δ

x_ij−

Δ

x_j)(Δ

x_ik−

Δ

x_ik).

where i specifies the respectively measured component.

6. The method as claimed in claim 1,

wherein a limit is set for the probability of failure P, said limit determining the time at which the probability of failure will reach the limit and this time being set as maintenance time.

7. The method as claimed in claim 1,

wherein a decision as to whether the production process of the component satisfies sufficiently stringent quality requirements for a specified application of the component is made on the basis of the determined probability of failure P.

8. The method as claimed in claim 1,

wherein the component is a component of a gas turbine or a steam turbine or of a generator or of a jet engine or of a shaft or of an aircraft wing.