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第 37 卷 第 5 期 Vol. 37, No.5
2018 年 9 月 Journal of Applied Acoustics September, 2018

纪念应崇福院士诞辰100周年

焊缝结构中超声相控阵聚焦声场的数值模拟及分析 ∗

史慧宇 1,2 阎守国 1† 张碧星 1

(1 中国科学院声学研究所 声场声信息国家重点实验室 北京 100190)
(2 中国科学院大学 北京 100049)
摘要 针对焊缝内相控阵声场聚焦问题，建立焊缝结构中多高斯声束法的相控阵声场计算模型，分别用直接
聚焦和底面反射聚焦两种方式对焊缝内部的相控阵声场进行数值模拟，分析不同方式下的相控阵聚焦声场特
性，讨论不同区域适用的聚焦方式，分析了界面倾斜角度对聚焦效果的影响。结果表明，在相同焊缝结构条件
下直接聚焦的方式更适合对厚壁焊缝的中下部进行聚焦扫描，在焊缝上表面附近，当声束偏转角大于 80 时，
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直接聚焦方式无法有效聚焦；反射聚焦的方式更适合对焊缝上表面附近区域进行聚焦扫描，随着焦点深度增
加，反射聚焦的声束偏转角增大，当声束偏转角大于 55 时，反射聚焦无法形成明显焦点；两种聚焦扫描方式
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可形成有效的互补。当设置的焦点固定时，直接聚焦的实际焦点随界面倾斜角度增大向预设点远处偏移，而反
射聚焦的效果基本不受倾斜角的影响，实际焦点始终在预设焦点附近。
关键词 焊缝，相控阵，声场分布，聚焦
中图法分类号: O426.9 文献标识码: A 文章编号: 1000-310X(2018)05-0817-08
DOI: 10.11684/j.issn.1000-310X.2018.05.030

Simulations and analyzation of phased array focus sound field in the welds

SHI Huiyu 1,2 YAN Shouguo 1 ZAHNG Bixing 1

(1 State Key Laboratory on Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
(2 University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract The multi-Gaussian acoustic beam phased array sound field calculation model in the weld structure
is established for the phased array sound field focusing problem of weld. The different numerical simulations of
focusing sound field which include direct focusing and bottom reflecting focusing are performed to analyze the
characteristics of phased array focusing sound field, discuss applicable focusing method to different areas and
analyze the influence of the interface tilt angle on the focusing effect. The results show that in a same weld
structure the direct focusing method is more suitable for focusing middle and lower parts of thick-walled welds.
In the vicinity of upper surface of the weld, when the beam deflection angle is greater than 80 , this method
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cannot effectively focus. And the reflecting focusing method is used to scan upper surface of weld seam. The
depth of focus increases, the deflection angle of the reflected beam increases, when the angle is greater than
55 , this method can not form a significant focus. The two focusing scanning methods can form an effective
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complementary. When focus is fixed, the actual focus of the direct focus shifts toward farther away from the
preset point as the interface tilt angle increases. The effect of reflecting focus is not substantially affected by
the tilt angle, and the actual focus is always near the preset focus.
Key words Welds, Phased array, Sound field, Focus

2018-06-14 收稿; 2018-08-02 定稿
国家自然科学基金项目 (11474308, 11574343, 11774377)
∗
作者简介: 史慧宇 (1992- ), 女, 山东临沂人, 博士研究生, 研究方向: 超声传播与成像。
† 通讯作者 E-mail: yanshouguo@mail.ioa.ac.cn