Abnormality detection device, abnormality detection system, abnormality detection method, and computer readable medium

An abnormality detection system, comprising:

• a sensor configured to detect a physical quantity generated by working by a machine;
• an abnormality detection device including
• an analysis section configured to acquire a frequency component of the physical quantity,
• a calculation section configured to calculate a value obtained by smoothing a value related to an intensity corresponding to a frequency in a predetermined range including a frequency at which wear occurs due to working of the machine in the frequency component, and
• a determination section configured to determine that the machine is abnormal when the value smoothed by the calculation section is outside a range between a damage threshold and a wear threshold.

A method for detecting an abnormality, comprising:

• acquiring a frequency component of physical quantity generated by working by a machine;
• calculating a value obtained by smoothing a value related to an intensity corresponding to a frequency in a predetermined range including a frequency at which wear occurs due to working of the machine in the frequency component;
• and
• determining that the machine is abnormal when the smoothed value is outside a range between a damage threshold and a wear threshold.

A computer readable medium, comprising:

• an abnormality detection program configured to cause an abnormality detection device to function as
• an analysis section configured to acquire a frequency component of physical quantity generated by working by a machine;
• a calculation section configured to calculate a value obtained by smoothing a value related to an intensity corresponding to a frequency in a predetermined range including a frequency at which wear occurs due to working of the machine in the frequency component, and
• a determination section configured to determine that the machine is abnormal when the value smoothed by the calculation section is outside a range between a damage threshold and a wear threshold.