论文部分内容阅读
声辐射阻抗反映了声源与声场之间的能量交换关系,是优化结构声学性能中控制的关键变量之一,针对其实验测量,基于波叠加法的基本原理,设计了用于测量结构声辐射阻抗的实验装置,进行标定实验后,对截面积均匀的圆管、截面积连续变化的号筒和截面积突变的消声器3种经典管道声学结构进行了测量,数据处理后得到实验解。对上述实验对象用有限元结合边界元法进行仿真计算,得到结构声辐射阻抗的数值解。对比实验解与数值解得出,该实验测量装置可以在一定频率范围内得到较精确的解。
Sound radiation impedance reflects the energy exchange between the sound source and the sound field is one of the key variables to optimize the structure of the acoustic performance control. For its experimental measurement, based on the basic principle of wave superposition method, designed to measure the structure of acoustic radiation Impedance experimental device. After calibration experiment, the three classic pipe acoustic structures of round tube with uniform cross-sectional area, horn with continuous cross-sectional area and muffler with abrupt change of area were measured. Experimental data were obtained after data processing. The above experimental subjects were simulated by the finite element method combined with the boundary element method to obtain the numerical solution of the structural acoustic radiation impedance. Comparing the experimental solution with the numerical solution, the experimental measurement device can obtain a more accurate solution in a certain frequency range.