PURPOSE: To make it possible to detect the number of rotation of a shaft by analyzing the frequency of a detected signal which represents the state of a rotary machine, comparing the spectrum value which is extracted in an arbitrarily set frequency region with a known spectrum value, and judging the result.
CONSTITUTION: In a condition setting part 2, the number of rotation of an input shaft and a spectrum value are used as references (or centers) when the initial values of a rotary machine to be measured M are registered, and a frequency region for retrieving and a reference value for the number of rotation of the input shaft are set. A data sampling part 3 latch the vibration data from the vibration sensor of the machine M. In a data analyzing part 4, the frequencies of the data are analyzed. In a number-of-rotation detecting part 5, the spectrum value S1 at the initial registration is compared with the maximum value S2 in measurement in the preset 2 region. When the ratio S2/S1 is the specified value (e.g. 80%) or more, the frequency having the value S2 is determined as the number of rotation of the rotary shaft. In a database part 6, various data such as the spectrum value at the initial registration for each frequency of each rotary machine are stored.
KOYAMA TAKASHI
KONISHI TETSUO
HARADA TAKURO
| JPH01265163A | 1989-10-23 | |||
| JPH01304358A | 1989-12-07 |