Prediction Method and Characteristics of Static Acoustic Scattering from Marine Propellers

doi:10.12382/bgxb.2023.0017

Abstract

Abstract:

For the prediction problem of static acoustic scattering characteristics of propellers, a planar element method combining the layered medium acoustic propagation theory and the discrete surface element thickness information is used to establish a prediction method for the acoustic scattering characteristics of thin plate targets with variable thickness surfaces.The basic idea is to solve the reflection coefficients of all surface elements based on the thickness of surface elements and material property information, and then obtain the total scattered acoustic field of the target. Considering the computational efficiency, the scattered sound field of a complete propeller is predicted by means of mesh topology clone from a single propeller blade. The results show that the predicted values of the frequency response characteristics, angle-distance spectrum and spatial directivity of propeller target strength are in general agreement with the experimental results. This study may be useful for the prediction of acoustic scattering characteristics near the stern of underwater vehicles.

Key words: propeller, planar element method, acoustic scattering characteristic, target strength

CLC Number:

TB566

KE Huicheng, PENG Zilong, ZHOU Fulin, CHEN Tianbao. Prediction Method and Characteristics of Static Acoustic Scattering from Marine Propellers[J]. Acta Armamentarii, 2024, 45(5): 1523-1533.

Figures/Tables 21

Fig.1 Schematic diagram of Kirchhoff approximate acoustic scattering calculation

Fig.2 Propagation of sound in fluid medium infinitely large elastic plate

Fig.3 Planar elements thickness determination method

Fig.4 Mesh cloning topology method(left:topological process, right: mesh after topology)

Table 1 Propeller model basic parameters

参数	取值
梢圆半径/mm	261.5
盘面比	0.507
叶片数	3
螺旋桨后倾角/(°)	0
毂径形状	直线型
桨毂内径/mm	67
桨毂外径/mm	81

Fig.5 Schematic diagram of propeller model

Fig.6 Single propeller blade structure

Table 2 Cut-out profile dimensions of singlepropeller paddle

r/R	母线到导边距离/mm	切面弦长/ mm	切面周长/ mm	最大切面厚度/mm
0.2	67.58	135.16	274.41	7.55
0.3	82.27	164.53	332.93	6.45
0.4	97.76	195.51	394.77	5.54
0.5	109.13	218.25	440.80	4.80
0.6	113.25	226.50	458.10	4.20
0.7	110.15	220.30	446.24	3.69
0.8	98.56	197.12	401.30	3.23
0.9	74.26	148.51	302.45	2.80
0.95	52.71	105.42	215.95	2.58
1.0				2.00

Table 3 Parameters for parametric modelling of single propeller blade dimensions

参数	数值
a_max/mm	206
c₁/mm	10
c₂/mm	2
d₁/mm	88

Fig.7 Calculation model of acoustic scattering characteristics of single propeller blade

Fig.8 Comparison of multiple scattering calculations for a single propeller blade (0° incidence)

Fig.9 Comparison of single propeller blade target strengths

Fig.10 Comparison of forward scattering target strengths of single propeller blade (θ=-45°~45°)

Table 4 Target strength calculation time comparison

全向散射和前向散射	有限元和板块元	网格单元数	网格节点数	计算时间/ s
全向散射	有限元	192303	41910	2150.5
	板块元	22396	11200	393.15
前向散射	有限元	192303	41910	2034.1
	板块元	22396	11200	394.64

Fig.11 Comparison of propeller target strengths

Table 5 Target strength calculation time comparison

有限元和板块元	网格单元数	网格节点数	计算时间/s
有限元	1503875	292033	16069.8
板块元	80867	40645	877.7

Fig.12 Propeller echo strength angle-time nephogram

Fig.13 Experimental propeller model

Fig.14 Layout of experimental systems

Fig.15 Echo strength angle-time nephogram of experimental models

Fig.16 Comparison of propeller target strength directivity

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