Method And System For Detection and Localization of A Fluid Related To A Piston Machine

A system, comprising:

• a piston machine, comprising:
• a plurality of cylinders, a piston disposed in each of the cylinders;
• a suction valve and a discharge valve coupled to each of the cylinders via a valve block;
• a vibration sensor attached to the valve block;
• a crankshaft coupled to the pistons;
• and
• a rotary angle transmitter configured to provide one pulse per revolution of the crankshaft;
• and
• a computer communicatively coupled to the vibration sensor and the rotary angle transmitter, the computer configured to:
• generate an angular position signal for the crankshaft;
• transform a vibration signal from the vibration sensor into an envelope signal representing an instant vibration level;
• construct, using the angular position signal, window functions that pick the envelope signal in selected angular shaft sectors;
• find sector based averages of the vibration level using the window functions, and
• compare the averages with a predetermined ambient vibration level to detect and localize leaks in up to two of the valves.

A non-transitory computer-readable medium encoded with instructions that when executed cause a computer to:

• receive one pulse per revolution of a crankshaft from a rotary angle transmitter attached to a piston machine;
• receive vibration signals from a vibration sensor attached to valve block of the piston machine;
• generate an angular position signal for the crankshaft based on the one pulse per revolution;
• transform the vibration signals into an envelope signal representing an instant vibration level;
• construct, using the angular position signal, window functions that pick the envelope signal in selected angular shaft sectors;
• find sector based averages of the vibration level using the window functions, and
• compare the averages with a predetermined ambient vibration level to detect and localize leaks in up to two valves of the piston machine.