2021-12-02T01:52:43Zhttps://nagoya.repo.nii.ac.jp/oaioai:nagoya.repo.nii.ac.jp:000306742021-11-16T00:36:19ZNonstationary vibrations of a rotating shaft with nonlinear spring characteristics during acceleration through critical speedsIshida, Yukio101864Ikeda, Takashi101865Yamamoto, Toshio101866Murakami, Shin101867Recently, there exist many rotating machineries which are operated above the major critical speeds. It is necessary for such a rotating shaft to pass resonance points under the rated speed with a small deflection safely at the start or end of its operation. In this paper, nonstationary vibration characteristics of a rotating shaft with nonlinear spring characteristics are investigated concerning the following critical speeds: a major critical speed, the critical speeds of subharmonic oscillations of orders 1/2 and 1/3, and a critical speed of a summed-and-differential harmonic oscillation. The rotating speed is changed with a constant acceleration. Especially, the influences of the angular acceleration λ, the initial angular positionΨ[0] of a rotor unbalance, the initial rotating speedω[s] and the initial disturbance on the maximum amplitude are investigated.departmental bulletin paperSchool of Engineering, Nagoya University1992-10-31application/pdfMemoirs of the School of Engineering, Nagoya University1441700919-0805https://nagoya.repo.nii.ac.jp/record/30674/files/44-1-01.pdfeng