双通道有源降噪次级声源优化布放的研究

Research on Optimal Placement of Dual Channel Active Noise Reduction Secondary Sound Sources

由于电力变压器的磁致伸缩现象向外辐射高分贝噪声,严重影响站内工作人员及附近居民工作与生活。文中以电力变压器有源降噪为目标,通过测量与分析变压器噪声成分,建立3个偶极声源条件下的有源降噪模型,给出模型中次级声源的最优角度;采用自适应滤波算法,对电力变压器噪声进行有源降噪可行性仿真分析;搭建基于LMS算法的DSP双通道有源降噪系统,并与单通道降噪系统进行实验对比,实验结果表明,当两次级声源θ位于模型中180°角时,降噪效果优于单通道有源降噪系统,可达到10~14 dB的降噪效果。

Due to the phenomenon of magnetostriction of power transformer radiating high-decibel noise,seriously affecting the work and life of staff in the station and nearby residents.In this paper,the active noise reduction of power transformer is the goal.By measuring and analyzing the noise components of the transformer,an active noise reduction model of three dipole sources is established,and the optimal angle of the secondary sound source in the model is given.The adaptive filtering algorithm is adopted to simulate the feasibility of active noise reduction for power transformer noise.The DSP dual channel active noise reduction system based on LMS algorithm is constructed and compared with the single-channel noise reduction system.The experimental results show that the noise reduction effect is better than the single-channel active noise reduction system when the secondary sound source a is located at180 0 in the model,and the noise reduction effect of 10~14 dB can be achieved.