电力变压器低频噪声的模拟与等效

Low-frequency noise simulation and equivalence of power transformers

变压器通过箱体振动向外界辐射噪声,采用数组点声源组成的声学系统可以模拟平板的振动,进而等效变压器的噪声.基于此选用4、16、36个点声源仿真出变压器噪声,并在实际运用中,利用36个点声源组成的系统来模拟某变压器的噪声,得到远处测试点的噪声水平,与实际基本相符,相对误差最低可达0.04%,最高仅为3.41%.在远场条件下,通过调整点声源的幅值、相位、频率,即可模拟出变压器的噪声,有利于有源降噪、次级声源布放等方面的实验研究.

The noise emitted by power transformers is carried over mainly by the enclosure;using an acoustic system composed of an array of point sources can simulate a vibrating rectangular plate;and then equivalent the noise of transformers.This article covers the transformer as a source of noise modeled as acoustic models comprised of 4,16,36 points sources,and puts the system composed of 36-point sources into practice.The noise level of the test points in the distance is basically in line with reality;the lowest relative error is 0.04%,and the highest is only 3.41%.For the far field condition in the case under consideration to be satisfied;through individual control of the amplitude and phase of each point source in the array,it is possible to obtain the sound field emitted by power transformers.This model can be used successfully in laboratory investigations of the use of active methods of noise control in power transformers.