[특허]Method and apparatus for analyzing rotating machines

[미국특허] Method and apparatus for analyzing rotating machines 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-029/00
출원번호	US-0707441 (1991-05-30)
발명자 / 주소	Hicho Michael D. (Broadview Heights OH)
출원인 / 주소	Life Systems, Inc. (Cleveland OH 02)
인용정보	피인용 횟수 : 126 인용 특허 : 0

초록 ▼

A vibration transducer (22) is mounted to a rotating machine (20) for sensing vibration thereof. An output electrical signal from the vibration transducer is analyzed to generate a level display (18) of vibrational displacement per unit time, a speed display (22) indicative of rotational speed, and a bearing condition display (20) indicative of bearing condition, all displays derived directly from the vibration transducer signal. The electrical signal is transformed (36) into a frequency spectrum that has an amplitude for each of a plurality of narrow frequency ranges or bins. Each frequency bin has a characteristic center frequency and a predefined width or band of frequencies. A speed analysis program (38) identifies a set of at least first, second and third order related frequency bins, i.e. frequency bins whose center frequencies are an even multiple of each other, that have a significantly high amplitude and provides the lowest bin center frequency as a control signal to the speed display. A bearing condition analysis program (40) eliminates the bins that are integer multiples of the running speed and lower frequency, e.g. less than third order, identifies sets of bins with relatively large amplitudes that are integer multiples of each other, and selects the set of bins with the largest amplitude as being controlling of bearing condition. After elimination of frequencies not indicative of bearing condition, the bearing defect frequency remains. The amplitude of this frequency is displayed on bearing condition readout (22). The amplitude indicating the severity of the bearing defect.

대표청구항 ▼

An apparatus for determining an indicator of a condition of a rolling element bearing enclosed in a housing of a rotating machine, the apparatus comprising: a vibration transducer means in contact with said housing means for sensing mechanical vibrations of the rotating machine and converting the sensed vibrations into an analog signal proportional to the sensed vibrations; an analog-to-digital convertor means for converting the analog signal into a digital signal; a means for converting the digital signal into a frequency spectrum; an analyzing means for analyzing the frequency spectrum to identify frequency components characteristic of problems other than bearing defects; a means for eliminating the frequency components related to problems other than bearing defects; a means for selecting a remaining frequency component having a highest amplitude as the indicator of the rolling element bearing condition.

이 특허를 인용한 특허 (126) 인용/피인용 타임라인 분석

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[미국특허] Method and apparatus for analyzing rotating machines 원문보기

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