電磁加振法によるボルト軸力測定の適用性評価

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  • デンジ カシンホウ ニ ヨル ボルト ジクリョク ソクテイ ノ テキヨウセイ ヒョウカ

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Abstract

The integrity and safety of a bolted joint are to be guaranteed by applying and maintaining an appropriate amount of bolt preloads. However, the variation of bolt preloads inevitably occurs in the service condition due to various reasons, even if the initial bolt forces are properly applied. Accordingly, the monitoring of bolt forces in the service condition is significantly important. From the practical point of view, it is preferably conducted without disassembling the objective bolted joint.<BR>In this paper, Electromagnetic Vibration Method is introduced for monitoring the variation of bolt preloads in the service condition, and its performance is examined by experiments using bolted joints with various geometric configurations. Electromagnetic Vibration Method estimates the magnitude of bolt force by measuring the resonant frequencies of the bolted joint, which vary in accordance with the contact pressure of the joint interface. Electromagnetic Vibration Method is found to be effective to estimate the bolt force with a reasonable accuracy, except for the bolted joint including the interface under very high contact pressure. In addition, the characteristics of the method are evaluated as a vibration problem by constructing a free vibration model composed of two masses and three springs.

Journal

  • Marine Engineering

    Marine Engineering 43 (4), 591-597, 2008

    The Japan Institute of Marine Engineering

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