摘要
在水声目标探测的优化中,为精确仿真水声换能器在水中的声场传播分布规律,首先利用多元高斯声束叠加模型,建立水声换能器的表面声压分布模型,然后通过频域有限差分法求解KZK传播方程,得到发射声场在水下分布规律和谐波特性,最后通过MATLAB进行数值仿真,得到各阶次谐波在声轴方向上的径向和轴向的分布情况,结果表明谐波阶次越高,波束越窄,声场能量较集中;各阶次谐波在轴向一定位置附近声压达到最大值,之后由于水介质的吸收效应逐渐衰减。上述研究对开展水下探测、非线性声场成像等具有重要的参考价值。
To simulate underwater acoustic transducer in the water sound field distribution accurately, a multivari- ate Gaussian beam superposition model is used to describe the acoustic pressure on the surface of the transducer, the KZK equation is solved with the method of frequency-domain finite difference, and the distribution of emission sound field underwater and harmonic characteristics is obtained. The distribution of each order of harmonics in the acoustic axis of the radial and axial numerical is simulated using MATLAB. The results show that the higher harmonic order with narrower the sound beam, which makes better focused sound field of energy, each order harmonics in the vicinity of the axial position of the sound pressure reaches a certain maximum, after which the aqueous medium due to the ab- sorption effect gradually decaies.
出处
《计算机仿真》
CSCD
北大核心
2015年第5期222-225,261,共5页
Computer Simulation
基金
国家自然科学基金(51105124
51075358
11474259)
浙江省自然科学基金(LQ12E05018)
浙江省公益技术应用研究项目(2014C31109)
关键词
水声工程
多元高斯声束模型
谐波特性
Underwater acoustic
Multivariate Gaussian beam model
Harmonic characteristics
