Similarity Analysis and Correction Method for Underwater Acoustic Scattering in Shell Thickness Non-coordinated Scale Models

doi:10.12382/bgxb.2024.0057

Abstract

Abstract:

Due to the limitations of processing technology,underwater pressure,safe transportation and other factors,the shell thickness and three-dimensional principal size of the acoustic scattering scale model are often difficult to meet the acoustic similarity design requirements,which seriously restricts the conversion of the acoustic scattering characteristics between the model and the actual ship.Therefore,this paper tries to take the acoustic similarity analysis and correction of the local acoustic parameters of the shell as the basis for the correction of the overall acoustic scattering of a target,and proposes a target strength correction method for the non-coordinated scale model of the shell thickness.The single and double-layer spherical shell models and the complex double-shell model are used for the correction and conversion analysis of target strength,respectively,and the variation law of target strength of the scale model caused by the change in the acoustic parameters of complex shell is summarized,and the effectiveness of the correction method is verified.The proposed correction method can be used to estimate a prototype more in line with the actual engineering needs from the target strength of the shell thickness non-coordinated scale model.

Key words: acoustic scattering, similarity theory, Rayleigh normal series solution, layered elastic medium theory, scale model

CLC Number:

TB566

LI Yinhao, PENG Zilong, SONG Hao, PENG Shaokang, TANG Yuhang. Similarity Analysis and Correction Method for Underwater Acoustic Scattering in Shell Thickness Non-coordinated Scale Models[J]. Acta Armamentarii, 2025, 46(3): 240057-.

Figures/Tables 14

Fig.1 Scattering of plane waves by a single-layer spherical shell

Fig.2 Scattering of plane waves by a double-layer spherical shell

Fig.3 Schematic diagram of acoustic field similarity

Fig.4 Scattering of specular highlights on convex surface

Fig.5 Reflection and transmission of a flat plate under oblique incidence

Fig.6 Acoustic coefficients of flat plate at perpendicular incidence

Table 1 Material properties

材料种类	密度/ (kg·m^-3)	剪切波波速/ (m·s^-1)	压缩波波速/ (m·s^-1)	厚度/mm
空气	1.44		343
水	1000		1500
结构钢	7800	3218	5439	8

Fig.7 Target strength-frequency curves of modified scale model and prototype

Fig.8 Curve of corrected scaled model and prototype target strength,along with the correction amount

Fig.9 Curves of corrected scale model and prototype target strengths and the correction amount

Fig.10 The highlight areas on the surface of the complex model at different angles of incidence

Fig.11 Schematic diagram of complex model dimensions

Fig.12 Cross-section diagram of complex bivariate finite element model

Fig.13 Curves of corrected scale model and prototype target strengths,along with the correction amount

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