两种不同剖分方式的声线束追踪法声衰减计算

摘要

A beam tracking method based on spatial subdivision is presented. Comparison of two algorithms based on different subdivision modes, triangular prism subdivision and tetrahedron subdivision, is given. These subdivisons are used for spatial structural partition in the spaces of sound sources and obstacles. By using the subdivided structures, the acoustic beam can be traced immediately and the tree structures can be generated. Backward trace of the beam is carried out to generate the acoustic path and obtain the three-dimensional sound field in help of sound emission and transmission model. Comparisons of the two subdivisions in the aspects of computational accuracy and efficiency are given, and their errors and limitations are discussed. The theoretical models are established and compared and an example is given. It shows that the two algorithms are precise and feasible and each of them has its own advantages.%提出一种基于空间剖分的声线束追踪算法，对两种不同剖分方式算法进行比较。算法采用三棱柱和四面体两种空间剖分方式对声源点、障碍物所在空间结构进行剖分；利用得到的剖分结构快速追踪声线束并生成树形结构体；反向追踪声线束生成路径并结合声音排放传播模型得到三维空间声场；对两种剖分方式在计算精度、效率上进行比较，并对其误差和局限性进行讨论。完成该算法模型建立和比较，并通过实验对其进行检验。实验数据显示算法有较高的运算速度和精确度，两种剖分方式各有优势。