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US 4,366,544 AGranted
Judging system for detecting failure of machine
AssigneesMitsubishi Denki Kabushiki Kaisha, Ichiji Shima, Hiroshi Teshima
InventorsIchiji Shima, Hiroshi Teshima, Takayuki Koizumi, Satoru Inoue
Life of this patent
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Abstract
A system for detecting whether a machine is in the normal or abnormal state by comparing detected values of waveforms of signals such as vibration generated from the machine with a set value a plurality of times to indicate failure of the machine when the detected values reach the set value a predetermined number of times.
Claims5
A method for detecting a failure of a machine comprising the steps of;
- detecting output signals from said machine by the use of a detection unit;
- filtering said detected signals in a low-pass filter;
- converting the output of said filter to a digital output in a A/D converter;
- operating upon the digital output of said converter in an arithmetic unit and comparing in a comparing unit the output of said arithmetic unit with a set value to display the possibility of failure of said machine:
- performing plural operation of said detection unit, said A/D converter unit, said arithmetic unit and said comparator unit for detecting said signals and comparing the output given by said arithmetic unit with a set value to indicate the failure of said machine when said outputs of said arithmetic unit exceed said set value a predetermined number of times.
2 more elements
The method of claim 1, 2 or 4 wherein the signals generated from said machine are signals for vibration of a bearing of a rotary machine.
Dependencies are inferred from the claim text.