# US 2025/0085704 A1 · Failure probability evaluation apparatus

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- Number: US 2025/0085704 A1
- Document ID: US20250085704A1
- Status: Published application
- Kind: A1
- Application number: 18/657,991
- Filed: 2024-05-08
- Published: 2025-03-13
- Earliest claimed: 2023-09-13
- Assignees: Hitachi, Ltd.
- Applicants: Hitachi, Ltd.
- Inventors: Hiroshi SHINTANI
- Web page: https://patentgrep.com/patent/US20250085704A1

## CPC

- G05B 23/0283: {Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] (preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06)}
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)

## Abstract

Provided is a failure probability evaluation apparatus that can improve identification accuracy of a failure probability function of a component and improve evaluation accuracy of a failure probability of the component. A failure probability evaluation apparatus 100 includes a maintenance history database 11, an operation database 12, and a calculation apparatus 13. The calculation apparatus 13 calculates, using a damage model with operation data as a parameter, a progression of damage to a component after installation of a sensor, learns the progression of the damage to the component after the installation of the sensor and estimates a progression of damage to the component before the installation of the sensor, calculates accumulated damage based on the progression of the damage to the component, and identifies, using the accumulated damage, a failure probability function.

## Claims

### Claim 1

A failure probability evaluation apparatus that targets on a component used in a plurality of machines to evaluate a failure probability of the component for each of the machines, the failure probability evaluation apparatus comprising:
a maintenance history database configured to store maintenance history data of the component in the plurality of machines;
an operation database configured to store operation data acquired in time series by a sensor of each of the plurality of machines; and
a calculation apparatus configured to identify, using the maintenance history database and the operation database, a failure probability function of the component, and to calculate, using the identified failure probability function, the failure probability of the component for each of the machines, wherein
the calculation apparatus is configured to
calculate, using a damage model with the operation data as a parameter, a progression of damage to the component after installation of the sensor,
learn the progression of the damage to the component after the installation of the sensor and estimate a progression of damage to the component before the installation of the sensor,
calculate accumulated damage to the component based on at least one of the progression of the damage to the component after the installation of the sensor and the progression of the damage to the component before the installation of the sensor, and
identify, using the accumulated damage, the failure probability function.

### Claim 2 (depends on 1)

The failure probability evaluation apparatus according to claim 1, wherein
the calculation apparatus identifies the damage model.

### Claim 3 (depends on 2)

The failure probability evaluation apparatus according to claim 2, wherein
the calculation apparatus identifies the damage model such that a variation in a failure probability density function obtained by differentiating the failure probability function is minimized.

### Claim 4 (depends on 1)

The failure probability evaluation apparatus according to claim 1, further comprising:
a user interface configured to enable setting of a period from a present time, wherein
the calculation apparatus calculates, using the identified failure probability function, the failure probability of the component after the period elapses, and displays the failure probability on the user interface.

### Claim 5 (depends on 4)

The failure probability evaluation apparatus according to claim 4, wherein
the calculation apparatus
calculates the accumulated damage to the component from an initial stage of the machine or a maintenance time point of the component to the present time,
learns the operation data to predict the operation data in the period, and predicts, using the damage model and the operation data in the period, the accumulated damage to the component in the period, and
calculates, using the identified failure probability function, the accumulated damage to the component from the initial stage of the machine or the maintenance time point of the component to the present time, and the accumulated damage to the component in the period, the failure probability of the component after the period elapses.

### Claim 6 (depends on 5)

The failure probability evaluation apparatus according to claim 5, wherein
the calculation apparatus changes, based on information from an operation planning system that changes an operation plan of the machine, the prediction of the accumulated damage to the component in the period.