标题： 基于光线追踪的半经典低频声学建模与局部和扩展反应边界 显示英文标题

标题： Ray-tracing semiclassical low frequency acoustic modeling with local and extended reaction boundaries

摘要： 最近引入的声线追踪半经典（RTS）方法已针对一组实际相关的边界条件进行了验证。 RTS 是一种频域几何方法，可直接再现声学格林函数。 如之前在矩形房间和具有实数且频率不变的阻抗的弱吸收边界上所展示的，RTS 能够模拟此类房间的最低模式，这使其成为封闭空间低频声场建模的有用方法。 在实际中，房间内布置了多种类型的材料和声学元件，导致频率相关、相位变化的吸收/反射。 在现实情况下，我们通过两种额外的边界条件测试了 RTS 方法：一种是模拟共振膜吸声器的局部反应边界，另一种是表示由刚性边界支撑的多孔层的扩展反应边界，该边界在 Delany-Bazley-Miki 模型内描述，以及它们的组合。 RTS 模拟的与空间相关的压力响应和倍频程带衰减曲线以及相应的混响时间与有限元方法得到的结果进行了比较。 显示英文摘要

摘要： The recently introduced acoustic ray-tracing semiclassical (RTS) method is validated for a set of practically relevant boundary conditions. RTS is a frequency domain geometrical method which directly reproduces the acoustic Green's function. As previously demonstrated for a rectangular room and weakly absorbing boundaries with a real and frequency-independent impedance, RTS is capable of modeling also the lowest modes of such a room, which makes it a useful method for low frequency sound field modeling in enclosures. In practice, rooms are furnished with diverse types of materials and acoustic elements, resulting in a frequency-dependent, phase-modifying absorption/reflection. In a realistic setting, we test the RTS method with two additional boundary conditions: a local reaction boundary simulating a resonating membrane absorber and an extended reaction boundary representing a porous layer backed by a rigid boundary described within the Delany-Bazley-Miki model, as well as a combination thereof. The RTS-modeled spatially dependent pressure response and octave band decay curves with the corresponding reverberation times are compared to those obtained by the finite element method.