Synchronization device and storage medium

Patent metadata

Field	Value
Publication number	US-12352667-B2
Application number	US-202018014340-A
Country	US
Kind code	B2
Filing date	Aug 4, 2020
Priority date	Aug 4, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A synchronization device includes: a machine data acquisition unit acquiring, as machine data, time-series information regarding driving of a machine; a measurement data acquisition unit acquiring, as measurement data, time-series information regarding a state of the machine; a correlation calculation unit calculating a correlation time difference which is a time difference when the strength of correlation between the machine data and the measurement data is maximum on the basis of the machine data, the measurement data, and a time difference when any one of the machine data and the measurement data is staggered in a positive or negative direction of a time axis; a synchronized data output unit outputting the machine data synchronized with the measurement data and the measurement data synchronized with the machine data on the basis of the correlation time difference.

First claim

The invention claimed is:

1. A synchronization device comprising:
machine data acquisition circuitry to acquire, as machine data, time-series information regarding driving of a machine that is information acquired at a time indicated by first time information;
measurement data acquisition circuitry to acquire, as measurement data, time-series information regarding a state of the machine that is information including a magnitude of a sound or vibration and acquired at a time indicated by second time information that is different from the first time information;
correlation calculation circuitry to calculate a correlation time difference that is a time difference when strength of correlation between an absolute value of the machine data and a frequency component of the measurement data is maximum on a basis of the machine data, the measurement data, and a time difference when any one of the machine data and the measurement data is staggered in a positive or negative direction of a time axis; and
synchronized data output circuitry to output, as synchronized machine data, the machine data synchronized with the measurement data on a basis of the correlation time difference, and to output, as synchronized measurement data, the measurement data synchronized with the machine data on a basis of the correlation time difference, wherein
the correlation calculation circuitry includes peak extraction circuitry to obtain a frequency at which a frequency spectrum of the measurement data peaks from the measurement data, and
the strength of correlation is calculated on a basis of a temporal change in a frequency component at which the frequency spectrum of the measurement data peaks, and the machine data.

2. The synchronization device according to claim 1 , wherein
the correlation calculation circuitry includes normalization circuitry to normalize the machine data and the measurement data used for calculation of correlation value.

3. The synchronization device according to claim 1 , wherein
the machine is a machine driven by a motor.

4. The synchronization device according to claim 1 , wherein
the machine is a machine driven by a motor, and
the machine data is data about an angle of rotation, a speed, a current, or a force of the motor.

5. A non-transitory computer-readable storage medium storing a program that causes a computer to implement a function of the synchronization device according to claim 1 .

6. The synchronization device according to claim 2 , wherein
the machine is a machine driven by a motor, and
the machine data is data about an angle of rotation, a speed, a current, or a force of the motor.

7. The synchronization device according to claim 1 , wherein
the machine is a machine driven by a motor, and
the machine data is data about an angle of rotation, a speed, a current, or a force of the motor.

8. A non-transitory computer-readable storage medium storing a program that causes a computer to implement a function of the synchronization device according to claim 2 .

9. A non-transitory computer-readable storage medium storing a program that causes a computer to implement a function of the synchronization device according to claim 1 .

10. A non-transitory computer-readable storage medium storing a program that causes a computer to implement a function of the synchronization device according to claim 3 .

11. A non-transitory computer-readable storage medium storing a program that causes a computer to implement a function of the synchronization device according to claim 4 .

12. A non-transitory computer-readable storage medium storing a program that causes a computer to implement a function of the synchronization device according to claim 6 .

13. A non-transitory computer-readable storage medium storing a program that causes a computer to implement a function of the synchronization device according to claim 7 .

14. A non-transitory computer-readable storage medium storing a program which causes a computer to execute process procedures including:
acquiring, as machine data, time-series information regarding driving of a machine that is information acquired at a time indicated by first time information;
acquiring, as measurement data, time-series information regarding a state of the machine that is information including a magnitude of a sound or vibration and acquired at a time indicated by second time information that is different from the first time information;
calculating a correlation value having maximum correlation strength between an absolute value of the machine data and a frequency component of the measurement data on a basis of the machine data, the measurement data, and a time difference when any one of the machine data and the measurement data is staggered in a positive or negative direction of a time axis;
calculating a correlation time difference that is a time difference when the correlation value is obtained;
determining, as synchronized machine data, the machine data synchronized with the measurement data on a basis of the correlation time difference, and determining, as synchronized measurement data, the measurement data synchronized with the machine data on a basis of the correlation time difference;
obtaining a frequency at which a frequency spectrum of the measurement data peaks from the measurement data; and
calculating the strength of correlation on a basis of a temporal change in a frequency component at which the frequency spectrum of the measurement data peaks, and the machine data.

Assignees

• Mitsubishi Electric Corp

Inventors

• Kizu Yuichi
• Kai Takashi
• Sekiguchi Hiroyuki
• Ikeda Hidetoshi

Classifications

• G01M99/005 Primary

  Testing of complete machines, e.g. washing-machines or mobile phones (testing of machine parts G01M13/00; testing of electric apparatus or components G01R31/50) · CPC title

• G05B23/0221 Primary

  Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods · CPC title