摘要
有源降噪技术主要基于声波干涉相消原理,因此初级声源和次级声源的声场传播特性及其声波相干作用导致的声场分布变化规律的研究对有源降噪的系统设计及次级声源的布局至关重要。在实验室进行变压器有源降噪实验时,通常采用扬声器来模拟变压器噪声,因此扬声器等效模型的选择很关键。等效为点声源模型简单方便,但误差较大。该文选取偶极声源模型作为扬声器的等效模型,并以实测特高压变压器噪声特性为基础,分别对扬声器等效为点声源模型和偶极声源模型的声场干涉特性进行仿真和实验验证。实验结果表明,偶极声源模型比点声源模型更符合扬声器实际的声辐射特性。
Active noise reduction technique is mainly based on the principle of acoustic interference cancellation.Therefore,it is very important for the active noise reduction and the placement of secondary sound sources to study the sound propagation characteristics of the primary and secondary sources and the variation of the sound field distribution caused by the coherent effects of the acoustic wave.In the laboratory,the loudspeaker is used to simulate transformer noise when it is used in active noise reduction experiments.Thus,the choice of speaker equivalent model is critical.Although the point source equivalent model is simple and convenient,the error is large.The dipole source was chosen as the equivalent model of the loudspeaker in this paper.Based on the measured noise characteristics of ultra high voltage(UHV)transformer,the acoustic interference characteristics of the speaker that was equivalent to both point source model and dipole source model was analysed through simulation and experiment.The experimental results show that the dipole acoustic source model is more in line with the actual acoustic radiation characteristics of the speaker than the point source model.
作者
李彩莲
刘国强
陈海燕
张超
夏正武
Li Cailian;Liu Guoqiang;Chen Haiyan;Zhang Chao;Xia Zhengwu(Institute of Electrical Engineering Chinese Academy of Sciences Beijing,100190,China;School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing,100049,China;Province-Ministry Joint state Key Laboratory of Reliability and Intelligence of Eletric Equipment Hebei University of Technology Tianjin,300130,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第A01期221-226,共6页
Transactions of China Electrotechnical Society
基金
湖南省自然科学科教联合基金(2018JJ5017)
湖南省自然科学基金(2018JJ3127)资助项目
关键词
特高压变压器
噪声
声场干涉
偶极声源模型
Ultra high voltage transformer
noise
sound field interference
dipole source model
