相控聚焦超声与圆孔交互作用的散射特性研究
发布时间：2018-08-14 09:58
【摘要】：相较于传统超声检测,相控阵技术的声束聚焦控制能力使得相控超声检测的分辨率、信噪比和灵敏度等性能得到有效提升。但针对相控超声与缺陷的交互作用认识不足,导致目前检测技术无法对缺陷进行准确定性和精确定量。为此,建立了一维线阵相控超声检测圆孔缺陷的有限元模型,重点研究相控聚焦波束与圆孔缺陷交互作用的声场散射特性。结果表明,圆孔散射L模态的能量主要集中于正反射区和正透射区,且在透射区的能量大于反射区的能量,而在与入射声束垂直的方向上能量极其微弱,几乎没有散射能量;散射L模态沿入射方向呈轴对称分布;对于不同直径的圆孔缺陷,直径越大,在相同方向上散射波的能量越大;对于相同直径的圆孔,聚焦波与平面波入射时,散射波的分布规律相同,但聚焦波散射的能量明显高于平面波入射时散射的能量。
[Abstract]:Compared with traditional ultrasonic detection, the focusing control ability of phased array technology can effectively improve the resolution, signal-to-noise ratio and sensitivity of phased ultrasonic detection. However, due to the lack of understanding of the interaction between phase-controlled ultrasound and defects, the current detection technology can not accurately qualitative and quantitative defects. In this paper, a finite element model for detecting circular hole defects by one-dimensional linear phased ultrasound is established, and the scattering characteristics of sound field of the interaction between phase focused beam and circular hole defect are studied. The results show that the energy of the circular hole scattering L mode is mainly concentrated in the positive reflection region and the positive transmission region, and the energy in the transmission region is larger than that in the reflection region, but in the direction perpendicular to the incident sound beam, the energy is very weak, and there is almost no scattering energy. The scattering L mode is axisymmetric distributed along the incident direction; the larger the diameter is, the larger the energy of scattering wave is in the same direction for the defect of circular hole with different diameters; for the same diameter circular hole, the focused wave and the plane wave are incident, The distribution of scattering wave is the same, but the energy of focused wave is obviously higher than that of plane wave.
【作者单位】： 中北大学机械与动力工程学院;中国特种设备检测研究院国家质量监督检验检疫总局无损检测与评价重点实验室;
【基金】：质检公益性行业科研专项(201410026);(201510068) 质检总局科技计划项目(2014QK252)
【分类号】：TB553
，
本文编号：2182502
[Abstract]:Compared with traditional ultrasonic detection, the focusing control ability of phased array technology can effectively improve the resolution, signal-to-noise ratio and sensitivity of phased ultrasonic detection. However, due to the lack of understanding of the interaction between phase-controlled ultrasound and defects, the current detection technology can not accurately qualitative and quantitative defects. In this paper, a finite element model for detecting circular hole defects by one-dimensional linear phased ultrasound is established, and the scattering characteristics of sound field of the interaction between phase focused beam and circular hole defect are studied. The results show that the energy of the circular hole scattering L mode is mainly concentrated in the positive reflection region and the positive transmission region, and the energy in the transmission region is larger than that in the reflection region, but in the direction perpendicular to the incident sound beam, the energy is very weak, and there is almost no scattering energy. The scattering L mode is axisymmetric distributed along the incident direction; the larger the diameter is, the larger the energy of scattering wave is in the same direction for the defect of circular hole with different diameters; for the same diameter circular hole, the focused wave and the plane wave are incident, The distribution of scattering wave is the same, but the energy of focused wave is obviously higher than that of plane wave.
【作者单位】： 中北大学机械与动力工程学院;中国特种设备检测研究院国家质量监督检验检疫总局无损检测与评价重点实验室;
【基金】：质检公益性行业科研专项(201410026);(201510068) 质检总局科技计划项目(2014QK252)
【分类号】：TB553
，
本文编号：2182502
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