10. A Study on the Vibration of the Pneumatic Seal Structure of the Air Cushion Craft

概要

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A fundamental study on the vibration characteristics of the air cushion craft was made, taking dynamic behavior of the pneumatic seal structure into considerations. A linearized mathematical model was derived for the dynamics of air cushion crafts. The effect of each parameter on the dynamic stability was investigated analytically and experimentally, from the view point of the negative resistance excitation system. The conclusions derived are as follows: 1) The dynamic stability of pneumatic seal structural vibration depends on the air transmission line characteristics and the seal configurations. The effects of these parameters on the stability criteria of the system can be numerically examined. 2) In the model test, the self excited vibration caused by the instability of the pneumatic seal system was observed in some range of the area ratio of the fan suction port and the feed hole in the air chamber. 3) The fundamental natural frequency, calculated for an air cushion craft model, agreed very well with that measured by the model test. The stable region varied by the feedhole area in the model test, and a similar tendencies were also observed in the numerical analysis. Further studies are necessary to explain completely the difference between the model test results and the numerical analysis results.
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