Vibration of Belt : 1st Report, Approximation of Frequency

久美, 関口; 一夫, 菅原

doi:10.1299/kikai1938.30.144

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Vibration Characteristics Of Normal V-belt In Operation1

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1996

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“…The natural frequency is consequently obtained (Cyubachi, 1958;Sekiguchi and Sugawara, 1964). The natural frequency of the first mode of a Vbek, for example an A-65 bek, is 40.2 Hz from the calculation based on the above equations.…”

Section: Vibration Characteristics Of Normal V-belt In Operationmentioning

confidence: 99%

Development of a diagnosis technique for failures of V-belts by a cross-spectrum method and a discriminant function approach

1996

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This paper describes the development of a failure diagnosis technique for V-belts through vibration monitoring. The V-belt vibration is monitored at a driven bearing body attached to a power transmission device. Seven basic causes of belt failure and their combinations are considered. Power spectra of the vibration data are calculated through noise reduction by a cross-spectnnn method. Six parameters characterizing the vibration data are extracted, and 16 typical combinations of the basic causes and a normal belt state are diagnosed successfully by a Bayes' discriminant function approach. Two types of incorrect diagnosis are examined: Type I leaves a failed belt not repaired, and type II causes overmaintenance. A risk ratio for the Bayes' discriminant function is determined to minimize the two types of incorrect diag-nosis. Moreover, the risk ratio is determined to minimize type I error.

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Section: Vibration Characteristics Of Normal V-belt In Operationmentioning

confidence: 99%