Abstract
In order to prevent noise generated from torsional resonance of multiblade fan, motor-driven by thyristor speed controller, the authors analyzed torsional natural vibration and frequency response of the fan shaft system, and elucidated the key points in design for vibration reduction. In analysis, it was assumed that the blades were beams, and the vibration system was a linear and branch shaft system, and transfer matrix method was used. For frequency response analysis, especially, material damping of each part of the system and damping due to solid friction of the bearings were considered. With regard to the validity of analysis, the experimental proof was done.
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