使用阵列技术识别高速行驶轿车的辐射声源

Application of the Array Technology in Identification of Radiated Noise Sources of Passenger Car Running at High Speed

阵列技术通过传声器获取声场信息,使用波束形成或功率谱估计原理对声场信号进行处理,能对宽带声源进行有效识别。在汽车表面声源分布假设的基础上利用平面十字阵列技术对某轿车高速行驶时的车外噪声源进行了识别。试验结果表明,阵列技术可以识别出高速运动轿车表面上的主要声源,从而为轿车的车外噪声控制提供了科学依据。

Array technology is to get sound field information by microphones,to process sound field signals apply ing the wave-packet forming principle or the power spectrum estimation principle and to be able to identify broad-band sound sources effectively.In the paper,based on the hypothesis of noise sources distribution on the surface of the car,identification of exterior noise sources of a passenger car running at high speed is carried out with the planar cross array technolo gy.It is shown by the test results that the array technology can identify the main noise sources on the surface of the passenger car running at high speed.So it offers the scientific basis for exterior noise control of passenger car.