Abstract
Sonobuoy usually consists of buoying, underwater lumped submerged masses and hydrophone. In order to reduce the vertical effect of waves on hydrophones, it is necessary to design a sonobuoy suspension heave reduction system. However, the current dynamic analysis of the system has various shortcomings. In this paper, we designed a sonobuoy suspension system composed of bungee cord and damping disk, and established its mathematical model considering the added mass and non-constant drag coefficient. The mathematical result was obtained by MATLAB. Besides, in order to make the finite element simulation simple and effective, we carried out the equivalent transformation of the nonlinear fluid resistance, and the equivalent damping coefficient was input to ANSYS for the simulation calculation. Based on the similarity criterion, a sonobuoy suspension heave reduction system experiment was designed to verify the effectiveness of the sonobuoy suspension system and explore the influence of excitation frequency and suspension mass on the heave reduction effect. Base on this, the experimental results were compared with the mathematical and simulation results, and the inertia coefficient was adjusted to reduce the error rate of mathematical and simulation calculation. This provides a more accurate mathematical and simulation calculation method for the heave response analysis.
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