Measuring and testing – Vibration – Sensing apparatus
Patent
1985-02-07
1986-09-30
Birmiel, Howard A.
Measuring and testing
Vibration
Sensing apparatus
73660, 340683, 364508, G01N 2904
Patent
active
046141170
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a vibration monitoring apparatus which is furnished with a plurality of vibration detectors in the rotational system of a rotary machine such as a turbogenerator or a large-sized variable-speed rotary machine and which has the function of sounding an alarm or energizing a stopping relay for the rotary machine when any abnormal vibration has occurred.
BACKGROUND ART
Heretofore, vibration monitoring apparatus of this type is known which is so constructed that a vibration level detected by a vibration detector mounted on a rotary machine or the like is compared with an alarm level for a fixed period according to the rotational frequency of the rotary machine, so that when the vibration level reaches the alarm level, the single-sided amplitude value of the vibration waveform is calculated by a computer, and that when the calculated result exceeds a control criterion, an alarm is provided.
In vibration monitoring apparatus of this type, it is an important factor that the processing of vibration signals detected by a plurality of vibration detectors is performed at high precision and at high speed by a computer system.
DISCLOSURE OF THE INVENTION
This invention provides a vibration monitoring apparatus having a key phaser for detecting the period of rotation of a rotary member to-be-monitored and vibration sensors and a vibration waveform in the information time interval of one period of the rotary member is subjected to digital signal processing by a control processor and a signal processor. The amplitude value of the vibration waveform is calculated and compared with a control value for the rotational frequency of the rotary member, the apparatus being capable of calculating a vibration level precisely and processing signals at high speed.
According to this invention, a memory is provided for storing a rotational frequency - versus - vibration level pattern whereby an alarm can be appropriately set at the speed change of the rotary member, and a vibratory abnormality can be found early.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing the arrangement of a vibration monitoring system according to an embodiment of this invention,
FIG. 2 is a signal waveform diagram showing several signals for calculating the amplitude value of a vibration waveform in the system of FIG. 1,
FIG. 3 is a flow chart showing an algorithm for calculating the double-sided amplitude value of the vibration waveform in the system of FIG. 1, and
FIG. 4 is a general flow chart showing the operation of a vibration monitoring apparatus according to this invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Now, one embodiment of this invention will be described with reference to the drawings. In FIG. 1, (1) designates a rotation mark which is directly coupled to the shaft of the rotor (2) of, for example, a turbogenerator being a rotary machine to-be-monitored, (3) a turbine, (4) bearing stands which bear the rotary shaft of the turbogenerator, (5) a key phaser which is arranged in opposition to the rotation mark (1) and which detects the rotation of the rotation mark (1) to detect the period of rotation of the rotary machine, and (6) vibration sensors which are fixed to the housing of the rotary machine and which are usually composed of X-axis sensors and Y-axis sensors situated in positions in directions orthogonal to the axis of the rotary shaft and in directions orthogonal to each other. (7) denotes a waveshaping unit, (9) a delay monostable multivibrator, (10) a clock generator for a period counter, (11) the period counter, (12) a register, (13) a binary counter, (14) a scanner, (15) a clock generator for A/D (analog/digital) conversion control, (16) an A/D converter, (17) a shift register, (20) a control processor, (21) a signal processor, (22) an alarm level setting unit, (23) a rewritable nondestructive memory in which a pattern of rotational frequencies - versus - vibration levels is stored, (24) an alarm relay, (25) a rotational frequency indicator, (26) a scanne
REFERENCES:
patent: 4426641 (1984-01-01), Kurihara et al.
patent: 4435770 (1984-03-01), Shiohata et al.
patent: 4437163 (1984-03-01), Kurihara et al.
patent: 4520674 (1985-06-01), Canada et al.
Birmiel Howard A.
Mitsubishi Denki & Kabushiki Kaisha
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