支持部にギャップを有するはり試験体を用いた振動試験による衝撃応答に関する検討

抄録

Behavior of equipments with a gap exsisting in an industrial plant has not been clear for high-frequency excitations. In this paper, the authors investigated the effect of the gap by conducting vibration tests with a simple test piece, in which two cases of high-frequency random waves were used. The first case of wave is a narrow band randam wave with only high frequency components, and the second case of wave is a wide band random wave with low frequency to high frequency components. While the gap was increased in the test, the test piece slipped and did not respond to the excitation of the first case, whereas a strain decreased and an acceleration increased for the second case. The displacement of the first wave was so small that the test piece moved inside two gaps without impacts. On the other hand, the contact occurred against the second wave. Therefore, the acceleration, which is more sensitive to high frequency compared to the strain, increased due to higher frequency components caused by impacts. As the results, we clarified the behavior with a gap for the two typical cases of high-frequency waves.