Research On The Structure And Performance Of Highefficiency And Light-weight Sound-absorbing And Insulating Materials For Distribution Transformers

With the development of society,the number and capacity of distribution transformers in residential areas are increasing,which leads to the problem of low frequency noise pollution.The conventional noise reduction materials have poor acoustic performance at low frequencies.In order to control the low-frequency noise more effectively,a high-efficiency lightweight composite resonance plate is designed.The composite resonance plate is composed of a micro-perforated panel,resonant plate,cavities,damping layer and porous ceramic materials.The composite resonance board was simulated using COMSOL software and experimentally verified the simulation results in the impedance tube.The symbolic acoustic performance of the composite resonance plate was used to obtain a composite resonance plate.The results of the impact of the district distribution transformers.In this paper,we firstly determine the structure of the composite resonant board,which is mainly composed of the micro-duplete plate,coupled with resonance plate,cavities（foam ceramic porous materials）,and damping coating layer to form the composite resonance plate.Then,the COMSOL software is used to establish a three-dimensional model of the composite resonant board based on the impedance tube,and the material and parameters of each portion are defined,and the grid division is performed.Finally,the calculation is performed,and the results of the influence of each parameter of the micro perforated plate on the sound absorption and insulation performance of the composite resonance plate are obtained.The results of the performance are analyzed,and the optimal parameters of each parameter can be obtained.Then,the optimized parameters are simulated to get the influence on the sound absorption and insulation performance of the composite resonance plate.In order to further enhance the acoustic performance of the structure,the foam ceramic porous materials are used to fill the cavity in the composite resonance plate.Two kinds of foam ceramics,SiC and Al₂O₃,are selected for simulation calculations,and other optimization parameters can also be obtained.Finally,several sets of optimized parameters obtained from the analysis are compared to obtain optimal parameters.Finally,the VA-LAB noise vibration test system and BSWA Audio Amplifier SWA-100 audio amplifier are used to simulate the noise generated by the power distribution transformer and the impedance tube of the data acquisition of the four channels.The experimental results show that the simulation calculation is accurate.In this paper,the optimal parameters of the composite resonant board are obtained,and the results show that the low frequency acoustic performance of the composite resonance plate under this parameter is far superior to conventional noise reduction materials.The conclusions are of great significance to the noise reduction of residential distribution transformers and the field of low frequency noise control,which can provide effective technical support from the environmental perspective to our country’s substation construction and operation maintenance.