Methods and apparatus to generate a pulse waveform from a tachometer signal

A non-transitory machine readable storage medium comprising instructions to cause programmable circuitry to at least:

• access a signal output by a tachometer monitoring machinery having a rotating component;
• determine, based on a first property of the signal, a first pulse threshold candidate for the signal;
• determine whether the first pulse threshold candidate satisfies a testing criterion by:
• generating a second pulse waveform via the first pulse threshold candidate, the second pulse waveform having a first pulse, a second pulse, and a third pulse;
• determining a first temporal distance between the first pulse and the second pulse;
• determining a second temporal distance between the second pulse and the third pulse;
• determining a ratio between the first temporal distance and the second temporal distance;
• and
• comparing the ratio to a stability threshold associated with the testing criterion;
• generate a second pulse threshold candidate after determining the first pulse threshold candidate does not satisfy the testing criterion, the second pulse threshold candidate based on (1) a second property of the signal or (2) a modification to the first pulse threshold candidate;
• determine whether the second pulse threshold candidate satisfies the testing criterion;
• and
• generate a first pulse waveform based on the second pulse threshold candidate after determining the second pulse threshold candidate satisfies the testing criterion.

A method comprising:

• accessing a signal output by a tachometer monitoring machinery having a rotating component;
• determining, based on a first property of the signal, a first pulse threshold candidate for the signal;
• determining whether the first pulse threshold candidate satisfies a testing criterion by:
• generating a second pulse waveform via the first pulse threshold candidate, the second pulse waveform having a first pulse, a second pulse, and a third pulse;
• determining a first temporal distance between the first pulse and the second pulse;
• determining a second temporal distance between the second pulse and the third pulse;
• determining a ratio between the first temporal distance and the second temporal distance;
• and
• comparing the ratio to a stability threshold associated with the testing criterion;
• generating a second pulse threshold candidate after determining the first pulse threshold candidate does not satisfy the testing criterion, the second pulse threshold candidate based on (1) a second property of the signal or (2) a modification to the first pulse threshold candidate;
• determining whether the second pulse threshold candidate satisfies the testing criterion;
• and
• generating a first pulse waveform based on the second pulse threshold candidate after determining the second pulse threshold candidate satisfies the testing criterion.