Pump cavitation detection device, method, and system

A detection method of causing a detection device to:

• acquire pressure data indicating pressure of a pump;
• calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the pressure data acquired;
• perform adjustment of detection information which includes the variation coefficient calculated by using a pressure transmission coefficient representing ease of transmission for pressure of the pump, the detection information being used for cavitation occurrence detection;
• and
• detect cavitation occurrence in the pump based on the detection information adjusted,
• wherein the method further causes the detection device to:
• adjust a reference variation coefficient, which is a threshold value to be used for the cavitation occurrence detection, determined in advance and included in the detection information, and thereby calculates an adjusted reference variation coefficient;
• and
• determine that cavitation has occurred in the pump, when the variation coefficient exceeds the adjusted reference variation coefficient.

A detection system comprising a pressure measurement device and a detection device for detecting cavitation occurrence in a pump external to the detection device, wherein

• the pressure measurement device measures pressure of the pump, and generates pressure data indicating a measurement result, and
• the detection device includes a processor configured to:
• acquire the pressure data from the pressure measurement device;
• calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data;
• perform adjustment of detection information that includes the calculated variation coefficient, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump, the detection information being used for cavitation occurrence detection;
• and
• detect cavitation occurrence in the pump based on the adjusted detection information,
• wherein the processor is further configured to:
• adjust a reference variation coefficient, which is a threshold value to be used for the cavitation occurrence detection, determined in advance and included in the detection information, and thereby calculates an adjusted reference variation coefficient;
• and
• determine that cavitation has occurred in the pump, when the variation coefficient exceeds the adjusted reference variation coefficient.

A detection device for detecting cavitation occurrence in a pump external to the detection device, the detection device comprising a processor configured to:

• acquire pressure data indicating pressure of the pump;
• calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data by using a standard deviation and an average value of the pressure data for a detection target period, the variation coefficient being an index that indicates how much amplitude a fluctuation of the pressure has;
• perform adjustment of detection information which includes the calculated variation coefficient, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump in a case of cavitation occurrence, the detection information being used for cavitation occurrence detection;
• and
• detect cavitation occurrence in the pump based on the adjusted detection information,
• wherein the processor is further configured to:
• adjust the variation coefficient by multiplication with the pressure transmission coefficient, and thereby to calculate an adjusted variation coefficient;
• and
• determine that cavitation has occurred in the pump, when the adjusted variation coefficient exceeds a reference variation coefficient determined in advance and included in the detection information.

A detection method of causing a detection device to:

• acquire pressure data indicating pressure of a pump;
• calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data by using a standard deviation and an average value of the pressure data for a detection target period, the variation coefficient being an index that indicates how much amplitude a fluctuation of the pressure has;
• perform adjustment of detection information which includes the variation coefficient calculated by using a pressure transmission coefficient representing ease of transmission for pressure of the pump in a case of cavitation occurrence, the detection information being used for cavitation occurrence detection;
• and
• detect cavitation occurrence in the pump based on the detection information adjusted,
• wherein the method further causes the detection device to:
• adjust the variation coefficient by multiplication with the pressure transmission coefficient, and thereby to calculate an adjusted variation coefficient;
• and
• determine that cavitation has occurred in the pump, when the adjusted variation coefficient exceeds a reference variation coefficient determined in advance and included in the detection information.

A detection system comprising a pressure measurement device and a detection device for detecting cavitation occurrence in a pump external to the detection device, wherein

• the pressure measurement device measures pressure of the pump, and generates pressure data indicating a measurement result, and
• the detection device includes a processor configured to:
• acquire the pressure data from the pressure measurement device;
• calculate a variation coefficient indicating amplitude of pressure magnitude of the pump based on the acquired pressure data by using a standard deviation and an average value of the pressure data for a detection target period, the variation coefficient being an index that indicates how much amplitude a fluctuation of the pressure has;
• perform adjustment of detection information that includes the calculated variation coefficient, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump in a case of cavitation occurrence, the detection information being used for cavitation occurrence detection;
• and
• detect cavitation occurrence in the pump based on the adjusted detection information,
• wherein the processor is further configured to:
• adjust the variation coefficient by multiplication with the pressure transmission coefficient, and thereby to calculate an adjusted variation coefficient;
• and
• determine that cavitation has occurred in the pump, when the adjusted variation coefficient exceeds a reference variation coefficient determined in advance and included in the detection information.