【摘要】 声场可视化能更直观地掌握声场分布特征,提供更多的声场信息,基于此提出1种利用运动声源波叠加理论实现高速铁路辐射噪声场可视化的技术,旨在揭示高速列车通过时铁路辐射噪声的声场分布特性。从列车通过时高速铁路的噪声源配置出发,使用偶极子声源模型重新构建波叠加理论,将最小二乘法与遗传算法相结合求解源强及指向角,并使用atlab编制基于运动声源波叠加理论的辐射噪声声场可视化应用程序,将该程序应用于实际的高速铁路辐射噪声场研究。结果表明:基于波叠加法的高速铁路辐射噪声场可视化技术可行,经过多普勒校正,列车通过时的铁路辐射噪声场的重构更为准确;经试验的某型高速列车在310 km·h^-1速度下运行的声源指向角大约为27°,声场指向斜上方;列车通过时铁路噪声主要集中在轮轨区域,且该区域辐射噪声衰减较慢。更多还原

【Abstract】 Acoustic field visualization can more intuitively master the distribution characteristics of sound field and provide more information about sound field. Based on this, a visualization technique of acoustic field for high speed railway based on wave superposition method(WSM) of moving acoustic source is proposed, which aims to expose the distribution characteristics of radiated sound field by railway when high speed train passes through. Starting with the sound source configuration of high-speed railway as the train passes by, dipole sound source models are adopted to reconstruct wave superposition theory. By combining the least square method with genetic algorithm, the source strength and angle of direction are solved. The application program for radiated noise field visualization based on the superposition theory of moving source wave is developed by using atlab,and the program is applied to the study of the radiated noise field of high speed railway. Results show that the visualization technology for the radiated acoustic field of high speed railway based on wave superposition method is feasible. With Doppler correction, the reconstruction of railway radiated noise field is more accurate when the train passes by. The direction angle of a certain type of high-speed train radiated sound source is about 27° at the speed of 310 km·h-1, and the sound field is inclined upward; when the train passes through, the railway noise is mainly concentrated in the wheel-rail area, and the radiation noise attenuation in this area is slow.更多还原