強力超音波放射用の長い円管の振動について

抄録

Axisymmetric vibrations of cylindrical tubes were analyzed by a new simple method to develop useful radiators of high-intensity ultrasound. The analysis was based on the assumption that the cylindrical tube was thin-walled, so the radial stress(σ_&ltrr&gt)was negligible. Several cylindrical tubes of mild steel were fabricated , and their resonant frequencies and displacement distributions were measured. By the experiment, it was confirmed that the analytical results could be applied to very thick cylindrical tubes of which inner-to-outer-radius ratio was 0. 6 and to long tubes. Two types of vibrations which were suitable for the radiator were found. One was the extensional radial-axial-coupled vibration and the other was the axisymmetric bending vibration. On the basis of the analytical results, we designed the cylindrical tube radiator which both sides were fixed by flanges. And the radiator was confirmed to be effective for radiating high-intensity ultrasound.