三维温度梯度场中本征声线轨迹的求取  

Solution of eigen acoustic ray paths in three-dimensional temperature gradient field

作　　者：颜华[1] 何爱娜[1] 王晓宁[1,2] 

机构地区：[1]沈阳工业大学信息科学与工程学院,沈阳110870 [2]沈阳大学信息工程学院,沈阳110044

出　　处：《沈阳工业大学学报》2016年第2期185-189,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(60772054;61372154);辽宁省高等学校优秀人才支持计划项目(LR2013005)

摘　　要：为了降低声波在温度梯度场中的折射现象对声学CT法温度场重建精度的影响,研究了温度梯度场中声波的真实传播路径,即本征声线轨迹,提出了一种三维本征声线出射角确定法.利用正三棱锥前向展开法,在单峰、双峰模型温度场中进行了三维本征声线追踪.结果表明,三维温度梯度场中的声线轨迹有明显弯曲,该三维本征声线轨迹求取法可用于复杂三维温度场中实际声线轨迹的确定,并有望应用于三维温度场声学CT重建系统中.To reduce the effect of sound wave refraction in temperature gradient field on the reconstruction accuracy of temperature field by acoustic computer tomography （CT）, the true propagation paths of acoustic ray in temperature gradient field, namely the eigen acoustic ray paths, were investigated. A method for determining the emergent angle of three-dimensional eigen acoustic ray was proposed. And thus, the three-dimensional eigen acoustic ray was traced in single-peak and dual-peak model temperature fields with the regular tetrahedron forward development method. The results show that the acoustic ray paths in three-dimensional gradient field have obvious bending effect. The proposed solution method for three-dimensional eigen acoustic ray paths can be used for determining the true acoustic ray paths in complex three-dimensional temperature field, and is expected to be applied to the acoustic CT reconstruction system of three-dimensional temperature field.

关 键 词：温度梯度场 本征声线 三维声线追踪 出射角 声线弯曲 声学CT 温度场重建 仿真研究 

分 类 号：TK311[动力工程及工程热物理—热能工程]