The supercavitating underwater vehicle is affected by the hydrodynamic forces acting on the cavitator, body and fins, and thrust force of the engine, and these external forces affect the natural vibration of the supercavitating underwater vehicle. Accurate analysis of natural frequencies and natural modes has a great importance in the structural design of supercavitating underwater vehicles. In this paper, a Euler-Bernoulli beam model with a non-uniform cross section was applied to analyze the natural vibration characteristics of the supercavitating underwater vehicle more accurately. Also, the force characteristics acting on the supercavitating underwater vehicle with different speeds, angles of attack, cavitation numbers, fin positions and mass variations were analyzed and the natural vibration characteristics were analyzed by applying the Riccati transfer matrix method. The main influence of the natural vibration characteristics on the analysis of the natural vibration characteristics of supercavitating underwater vehicles by applying the Euler-Bernoulli beam theory through the calculation results is the distribution of the axial force formed by the total external force and the mass change characteristic. Also, the natural vibration characteristics of the system are sensitive to changes in cavitation number, angle of attack, vehicle velocity, fin position, and mass distribution, so that the change in the characteristic of the system can be accurately analyzed to ensure the reliability of the structural design.
Jo et al. (Fri,) studied this question.