液体を満たした高速回転軸内の非回転管の動的不安定

概要

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An investigation is made into the dynamic instability of a non-rotating elastic pipe in a high speed hollow cylindrical rotor filled with a viscous liquid. The system considered simulates a liquid cooled rotor mechanism. Assuming a small circular whirling motion of the pipe, perturbed motions of the liquid-pipe system are analyzed. The theory shows that the forward self-excited whirling motions of the pipe can be induced at rotor speeds somewhat higher than the natural frequency of the pipe. the lower bound of the unstable region mainly depends on the bulk density of the pipe relative to the liquid density. Hence, the most effective way to stabilize the system is to introduce a pipe lighter in bulk density than the surrounding liquid. Experiments are carried out to verify the theory. some interesting results of the dynamic behavior of the pipe are also obtained in the experiments.
一般社団法人日本機械学会の論文
1988-06-25