各種補強円筒殼の内・外圧下における動的挙動

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Stiffened cylindrical shells are commonly used for aircraft fuselage, missile bodies, and tanks because of their strength, stiffness and good buckling characteristics, as well as their extremely light weight. There have been many reports on the theoretical and experimental investigation with relation to the free vibration characteristics of stiffened shells. The free vibration characteristics are necessary for designing structures while taking into consideration fatigue durability and safety. Some methods of the reinforcement against the natural frequencies of shells have been proposed, but there have not been enough reports on practical use. First, we extensively analyzed the natural frequency characteristics of stiffened cylindrical shells under pressure by FEM analysis. Next, we verified the reinforcement effect of some of the methods by conducting an experiment based on the analysis results, and we ensured that the clamped boundary condition was the same as that of the analysis model. As a result of the investigation, it became clear that there was a natural frequency shift to a lower frequency region and a decrease in the rigidity of shells under external pressure. However, the decrease in rigidity and frequency could be reduced effectively by using ring stiffener. Although oval-type vibration had not been considered as important as beam-type vibration until recently, we were also able to confirm that the control of oval-type vibration is effective in enhancing not only the natural frequency but also the rigidity of the shells. Moreover, the coupling behavior between the beam-type and oval-type vibration influences the vibration characteristics and rigidity of the shells, and the orthogonal stiffener allows for the control of both vibration types. Furthermore, the stringer showed that the effect of reinforcement against external pressure in orthogonally stiffened shells was good. Therefore, these results for the dynamic behavior of stiffened cylindrical shells will help contribute to the design of structures for practical use.
東海大学の論文

各種補強円筒殼の内・外圧下における動的挙動

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