基于参数等效法的敷设声学覆盖层的结构物水下低频声目标强度研究
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摘要
采用参数等效方法计算了敷设声学覆盖层的结构物水下低频声目标强度。首先应用有限元模拟充水阻抗管的方法获取圆台型空腔声学覆盖层敷设在与计算模型具有相同厚度的钢材上的声反射系数;其次,根据参数等效前后反射系数相等的原理,利用遗传算法反演声学覆盖层的等效物理参数(杨氏模量、泊松比、损耗因子);最后将反演得到的等效参数应用于均匀阻尼层,获得模型的水下声目标强度,验证该方法的可行性。结果表明,该方法能有效且高效地获得敷设圆台型空腔声学覆盖层的结构物水下低频声目标强度。
It's generally difficult to predict the acoustic target strength of a submarine with anechoic coatings by conventional finite element method(FEM). Parameter inversion is a common method to solve this problem.Some researchers have studied the parameter inversion about normal incidence of anechoic coatings. In this paper, the FEM of impedance tube is used to obtain acoustic reflection coefficient of anechoic coatings. Then the genetic algorithm is applied to acquire the physical parameters of viscoelastic material which is equivalent to anechoic coatings. The LMS Virtual Lab is used to construct finite element model of the anechoic coatings to validate the parameter inversion with normal incidence.
It's generally difficult to predict the acoustic target strength of a submarine with anechoic coatings by conventional finite element method(FEM). Parameter inversion is a common method to solve this problem.Some researchers have studied the parameter inversion about normal incidence of anechoic coatings. In this paper, the FEM of impedance tube is used to obtain acoustic reflection coefficient of anechoic coatings. Then the genetic algorithm is applied to acquire the physical parameters of viscoelastic material which is equivalent to anechoic coatings. The LMS Virtual Lab is used to construct finite element model of the anechoic coatings to validate the parameter inversion with normal incidence.
引文
[1]CHAI Ying-bin,GONG Zhi-xiong,LI Wei,et al.Application of smoothed finite element method to two-dimensional exterior problems of acoustic radiation[J].International Journal of Computational Methods,2018,15(1):1850029-1-35.
[2]CHAI Ying-bin,GONG Zhi-xiong,LI Wei,et al.A smoothed finite element method for exterior Helmholtz equation in two dimensions[J].Engineering Analysis with Boundary Elements,2017,84:237-252.
[3]游翔宇,郑文成,李威,等.基于边光滑有限元法的加筋板静力和自由振动分析[J].计算力学学报,2018,35(1):28-34.
[4]KIM Hwa-Muk,HONG Suk-Yoon.Numerical simulation of submarines with anechoic coatings for acoustic target strength reduction[J].Naval Engineers Journal,2012(124-4):49-58.
[5]王曼.水声吸声覆盖层理论与实验研究[D].哈尔滨:哈尔滨工程大学,2004.
[6]HLADKY-HENNION AC,BOSSUT R,DECARPIGNY JN.Analysis of the scattering of plane acoustic wave by a periodic elastic structure using the finite element method:application to compliant tube gratings[J].J.Acoust.Soc.Am.,1990,87(5):1861-1870.
[7]陶猛,汤渭霖.Alberich型吸声覆盖层的低频吸声机理分析[J].振动与冲击,2011,30(1):56-60.
[8]张玉玲,陶猛,范军.敷设吸声材料复杂目标的目标强度计算[J].上海交通大学学报,2009,43(8):1322-1328.
[9]金国梁,尹剑飞,温激鸿.基于等效参数反演的敷设声学覆盖层的水下圆柱壳体声散射研究[J].物理学报,2016,65(1).
[10]詹福良,徐俊伟.Virtual.Lab Acoustic声学仿真计算从入门到精通[M].西安:西北工业大学出版社.2013
[11]布列霍夫斯基赫著(杨训仁译).分层介质中的波[M].北京:北京科学出版社.1960.
[2]CHAI Ying-bin,GONG Zhi-xiong,LI Wei,et al.A smoothed finite element method for exterior Helmholtz equation in two dimensions[J].Engineering Analysis with Boundary Elements,2017,84:237-252.
[3]游翔宇,郑文成,李威,等.基于边光滑有限元法的加筋板静力和自由振动分析[J].计算力学学报,2018,35(1):28-34.
[4]KIM Hwa-Muk,HONG Suk-Yoon.Numerical simulation of submarines with anechoic coatings for acoustic target strength reduction[J].Naval Engineers Journal,2012(124-4):49-58.
[5]王曼.水声吸声覆盖层理论与实验研究[D].哈尔滨:哈尔滨工程大学,2004.
[6]HLADKY-HENNION AC,BOSSUT R,DECARPIGNY JN.Analysis of the scattering of plane acoustic wave by a periodic elastic structure using the finite element method:application to compliant tube gratings[J].J.Acoust.Soc.Am.,1990,87(5):1861-1870.
[7]陶猛,汤渭霖.Alberich型吸声覆盖层的低频吸声机理分析[J].振动与冲击,2011,30(1):56-60.
[8]张玉玲,陶猛,范军.敷设吸声材料复杂目标的目标强度计算[J].上海交通大学学报,2009,43(8):1322-1328.
[9]金国梁,尹剑飞,温激鸿.基于等效参数反演的敷设声学覆盖层的水下圆柱壳体声散射研究[J].物理学报,2016,65(1).
[10]詹福良,徐俊伟.Virtual.Lab Acoustic声学仿真计算从入门到精通[M].西安:西北工业大学出版社.2013
[11]布列霍夫斯基赫著(杨训仁译).分层介质中的波[M].北京:北京科学出版社.1960.