MACHINE DIAGNOSTIC APPARATUS AND MACHINE DIAGNOSTIC METHOD

• US 20180011480A1
• Filed: 01/20/2015
• Published: 01/11/2018
• Est. Priority Date: 01/20/2015
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: HIRUTA, Tomoaki, MAKI, Kohji, KATO, Tetsuji, ATARASHI, Yoshitaka
• Granted Patent: US 10,295,995 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 31/343 in operation
• CPC Class Codes: G05B 23/0208 characterized by the configuration of the monitoring system
• CPC Class Codes: G05B 23/0227 Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions

Abstract

An operation mode specifying unit specifies an operation mode of a machine by comparing time-series data of an amplitude and a frequency of measurement data obtained from a sensor with definition data of the operation mode of the machine created in advance by an operation mode data creation unit. In addition, an abnormality diagnosis unit performs processing of cluster analysis for the measurement data obtained from the sensor or the like, and diagnoses abnormality of the machine according to diagnosis procedure information that is set in advance depending on the set operation mode and an abnormality mode of the machine.

Claims

1. A machine diagnostic apparatus comprising:

a sensor data acquisition unit that acquires time-series measurement data measured by a sensor from the sensor attached to a machine having one or more operation modes;

an operation mode data creation unit that creates operation mode data defining the operation mode of the machine based on time-series data of an amplitude and a frequency of at least one piece of time-series measurement data acquired in the past via the sensor data acquisition unit, and stores the operation mode data in a storage device;

an operation mode specifying unit that specifies the operation mode of the machine by comparing the time-series data of the amplitude and the frequency of the measurement data to the operation mode data stored in the storage device when acquiring the time-series measurement data via the sensor data acquisition unit; and

an abnormality diagnosis unit that processes the time-series measurement data acquired via the sensor data acquisition unit and diagnoses abnormality of the machine according to diagnosis procedure information that is set in advance depending on the operation mode that is specified in the operation mode specifying unit and an abnormality mode of the machine.

2. The machine diagnostic apparatus according to claim 1,

wherein the operation mode data creation unit displays the time-series data of the amplitude and the frequency of the time-series measurement data acquired in the past via the sensor data acquisition unit to a display device when creating the operation mode data, reads sorting information for extracting each operation mode that a user inputs based on the time-series data of the displayed amplitude and the frequency, and creates the operation mode data using information of a time period designated by the read sorting information and the time-series data of the amplitude and the frequency of the measurement data included in the time period.

3. The machine diagnostic apparatus according to claim 1,

wherein when abnormality of the machine is detected, the abnormality diagnosis unit displays diagnosis result data configured to include an abnormality mode and the operation mode of the machine that is specified by the operation mode specifying unit at a time point at which the abnormality is detected to a display device.

4. The machine diagnostic apparatus according to claim 3,

wherein the abnormality diagnosis unit further displays the time-series measurement data acquired by the sensor data acquisition unit or a frequency analysis result thereof in a time range including a time point at which the abnormality is detected in a case where an input for selecting one piece of diagnosis result data among one or more pieces of diagnosis result data displayed in the display device is received.

5. A machine diagnostic method,

wherein a computer that is connected to a sensor attached to a machine executes

a sensor data acquisition process of acquiring time-series measurement data measured by the sensor from the sensor;

an operation mode data creation process of creating operation mode data defining the operation mode of the machine based on time-series data of an amplitude and a frequency of at least one piece of time-series measurement data acquired in the past via the sensor data acquisition process, and storing the operation mode data in a storage device;

an operation mode specifying process of specifying the operation mode of the machine by comparing the time-series data of the amplitude and the frequency of the measurement data to the operation mode data stored in the storage device when acquiring the time-series measurement data via the sensor data acquisition process; and

an abnormality diagnosis process of processing the time-series measurement data acquired via the sensor data acquisition process and diagnosing abnormality of the machine according to diagnosis procedure information that is set in advance depending on the operation mode that is specified in the operation mode specifying process and an abnormality mode of the machine.

6. The machine diagnostic method according to claim 5,

wherein in the operation mode data creation process, the computer displays the time-series data of the amplitude and the frequency of the time-series measurement data acquired in the past via the sensor data acquisition process to a display device when creating the operation mode data, reads sorting information for extracting each operation mode that a user inputs based on the time-series data of the displayed amplitude and the frequency, and creates the operation mode data using information of a time period designated by the read sorting information and the time-series data of the amplitude and the frequency of the measurement data included in the time period.

7. The machine diagnostic method according to claim 6,

wherein in the abnormality diagnosis process, when abnormality of the machine is detected, the computer displays diagnosis result data configured to include an abnormality mode and the operation mode of the machine that is specified by the operation mode specifying unit at a time point at which the abnormality is detected to a display device.

8. The machine diagnostic method according to claim 7,

wherein in the abnormality diagnosis process, the computer further displays the time-series measurement data acquired by the sensor data acquisition process or a frequency analysis result thereof in a time range including a time point at which the abnormality is detected in a case where an input for selecting one piece of diagnosis result data among one or more pieces of diagnosis result data displayed in the display device is received.