Abstract
The heavy machine tools are often made of welded steel and at the same time jointed beam or a damping joint is often used. However the behaviour of the damping capacity of higher mode of vibration of the jointed beam has not been yet fully clarified. In this paper the relationships between the frequency and the damping capacity or the slip ratio and between the damping capacity and the mode of vibration have been experimentally studied by the use of an improved band-width method with two kinds of jointed cantilever beams which are connected with a single bolt and several bolts respectively.
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