Simulation for natural vibration of a conical shell with T-shaped stiffener in water

A conical shell is one of the typical structural forms of underwater navigation. This paper explores the free vibration properties of finite-length cones, analyses the modular frequency and modular vibration type properties in vacuum and underwater cones, and conducts a comparative analysis. The numerical calculations show: The use of hydrogen in conjunction with the hydrophobic structure of the cone will lead to a significant decrease in the modular frequency of the shell, with a maximum decrease of 40% for the first 10 modules of this model; Modal vibration patterns are similar in air and underwater, but the order of the modal vibrations may vary, indicating that the frequency reduction of different modal frequencies caused by the water medium is different. The conclusions of this article can be used as a reference for the design, optimization, and application of conical shells in engineering.