Boots – shoes – and leggings
Patent
1985-02-07
1987-07-28
Gruber, Felix D.
Boots, shoes, and leggings
73579, 73602, 73660, 340683, 364550, G01H 1106, G01M 1300, G06F 1536
Patent
active
046835423
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an apparatus which normally monitors the vibrations of a plurality of rotary machines, for example, turbines, dynamos and compressors, and which provides an alarm when any abnormal vibration has arisen.
BACKGROUND ART
Heretofore, vibration monitoring apparatus of this type included a computer wherein a vibration level detected by a vibration detector mounted on a rotary machine or the like is compared with an abnormal vibration level according to the rotational frequency of the rotary machine, and wherein an alarm is given when the vibration level exceeds the abnormal vibration level.
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 in which the rotational frequency and vibration alarm level of a rotary member to-be-monitored are stored in memory in advance and sent to a signal processor by a control processor. Vibration data from a vibration sensor is subjected to digital signal processing by the signal processor, and the amplitude value of a vibration waveform is calculated and compared with the vibration alarm level corresponding to 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 rotational frequencies and alarm levels corresponding thereto, whereby vibration monitoring of high precision which conforms to a plurality of rotary machines having different vibration monitoring criteria and rotational frequencies can be performed.
The present invention realizes high speed and high precision owing to a signal processor, and intends a small-sized, less expensive and maintenance-free apparatus.
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 the drawings, 1 designates a plurality of rotary machines M.sub.1 -M.sub.8 to-be-monitored having different rotational frequencies, and 2 vibration sensors which are mounted in correspondence with the shafts of respective rotary meachines and which are usually composed of X-axis sensors and Y-axis sensors positioned in orthogonal directions relative to the axes of the rotary shafts of the rotary machines and to each other. 3 designates a scanner, 4 an A/D (analog/digital) converter, 5 a shift register, 6 a clock generator for starting the A/D converter 4 and for driving the shift register, 7 a signal processor, 8 a control processor, 9 a rotational frequency setting unit, 10 a vibration alarm level setting unit, 11 a nonvolatile RAM (random access memory), 12 an alarm relay, 13 a channel indicator, 14 a vibration level indicator, and 15 a D/A (digital/analog) converter. In addition, 16 denotes the data bus between the control processor 8 and the signal processor 7, 17 a control signal line, 18 a serial data signal line from the shift register 5, 19 a shift clock signal line, 20 a channel setting unit, and 21 registers. The control processor 8 and the nonvolatile RAM constitute a main processor unit; the scanner 3, A/D converter 4, shift register 5, clock generator 6 and signal processor 7 constitute a signal processor unit; and the alarm relay
REFERENCES:
patent: 4184205 (1980-01-01), Morrow
Gruber Felix D.
Mitsubishi Denki & Kabushiki Kaisha
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