Stick-slip detection device, stick-slip detection method, and stick-slip detection program

Abstract

To accurately detect stick-slip phenomena. [Solution] The stick-slip detection device 100 is characterized by comprising: a measuring unit 131 that measures the displacement of a movable part having a contact sliding part; a identifying unit 132 that identifies a section in which the sign of the difference between the measured value of the movable part measured by the measuring unit 131 and the set value of the movable part does not change for a predetermined period of time; a calculation unit 133 that calculates an index value based on the measured value of the movable part and the set value of the movable part in the section identified by the identifying unit 132; and a detection unit 134 that detects an abnormality in the movable part when the index value calculated by the calculation unit 133 is greater than or equal to a predetermined threshold.

Claims

1. A measuring unit for measuring the displacement of a movable part having a contact sliding part, A identifying unit that identifies an interval in which the sign of the difference between the measured value of the movable part measured by the measuring unit and the set value of the movable part does not change for a predetermined period of time. A calculation unit that calculates an index value based on the measured value of the movable part in the section identified by the identification unit and the set value of the movable part, A detection unit that detects an abnormality in the movable part when the index value calculated by the calculation unit is greater than or equal to a predetermined threshold. A stick-slip detection device characterized by having the following features.

2. The specified part is, Within the aforementioned section, a section is identified that starts a predetermined time after the point in time when the difference occurred, and ends a predetermined time before the point in time when the sign of the difference changed. The stick-slip detection device according to claim 1, characterized in that it is the same as described in claim 1.

3. The calculation unit calculates, as an index value, the absolute value of the slope of the displacement of the set value of the movable part with respect to the slope of the displacement of the measured value of the movable part in the section specified by the identification unit. The stick-slip detection device according to claim 1, characterized in that it is the same as described in claim 1.

4. The output unit outputs the detection result from the detection unit. The stick-slip detection device according to claim 1, further characterized by having the following features.

5. The stick-slip detection device according to claim 4, characterized in that the output unit alerts an external device when the number of abnormalities in the movable part detected by the detection unit exceeds a threshold.

6. A stick-slip detection method performed by a stick-slip detection device, A measurement process for measuring the displacement of a movable part having a contact sliding part, A selection step to identify a section in which the sign of the difference between the measured value of the movable part measured by the measurement step and the set value of the movable part does not change for a predetermined period of time. A calculation step of calculating an index value based on the measured value of the movable part in the section identified by the specified step and the set value of the movable part, A detection step in which an abnormality in the movable part is detected when the index value calculated by the calculation step is greater than or equal to a predetermined threshold; A method for detecting stick-slip, characterized by including the following:

7. A measurement step for measuring the displacement of a movable part having a contact sliding part, A selection step to identify an interval in which the sign of the difference between the measured value of the movable part measured by the measurement step and the set value of the movable part does not change for a predetermined period of time, A calculation step which calculates an index value based on the measured value of the movable part in the section identified by the specified step and the set value of the movable part, A detection step in which an abnormality in the movable part is detected when the index value calculated in the calculation step is greater than or equal to a predetermined threshold, A stick-slip detection program characterized by having a computer execute it.

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