动车组铝板结构辐射效率与隔声量的关系研究

Relationship Study Between Radiation Efficiency and Sound Insulation of Aluminum Plate Structure for EMU

高速列车车体以及内饰板大部分都是薄板结构,各种噪声源和振动源也都会通过车体结构传递到薄板结构从而辐射到车内。通过模拟局部薄板结构的辐射与响应、辐射效率与隔声量的理论公式推导,结合试验证明了推导公式的正确性,给出了声辐射功率、辐射效率与隔声量的理论公式,并从定性的角度指出临界频率区域辐射效率与隔声量的变化,为后续的各种结构薄板的声振特性分析提供一定的理论基础.

The high-speed train car body and interior panels are mostly thin plate structure,these structure become one of the main radiation noise inside the car.In this paper,the theoretical formulas of radiation and response,radiation efficiency and sound insulation of the local thin plate structure are deduced through simulation.Combined with experiments,the correctness of the formula is approved,the acoustic radiation efficiency and power is given with the theory of sound insulation quantity formula,and points out that the critical frequency region radiation efficiency from the Angle of qualitative and sound insulation quantity change,for the subsequent vibroacoustic characteristics of various structure sheet analysis provide certain theoretical basis.