【摘要】 边界条件是声学计算的重要问题,声学计算中常用无反射边界模拟自由声场。目前无反射边界主要的模拟方法有辐射边界法、特性声阻抗法与PML法。研究无反射边界的声学数值计算,总结了三种无反射边界的理论基础,以平面波入射的自由声场为算例,对三种边界的吸声能力与应用等问题进行了分析和总结,论证了对于入射角度较大的问题,PML法具有最好的无反射能力,辐射边界法与特性声阻抗法则会产生较大的误差。更多还原

【Abstract】 Boundary condition is an important issue in acoustic calculations, and free acoustic field is often simulated by non-reflection boundary in acoustic calculations. At present, the main simulation methods are radiation boundary method, characteristic acoustic impedance method and PML method in non-reflection boundary. Acoustic numerical calculations of non-reflection boundary were studied, the theoretical basis of three non-reflective boundaries was summarized. With plan wave incidence of free field for example, the acoustic absorption capacity and application of three kinds of boundary were analyzed and summarized. For the question of large incidence angle, PML method has the best non-reflective ability, radiation boundary method and characteristic acoustic impedance method will produce a greater error.更多还原