关键词: 声学, 电磁炉, 频谱分析, 电磁噪声, 沸腾噪声, 贡献度

Abstract:

Induction cooker creates much noise in use. In this paper, the noises of the induction cooker and the fan are tested. Combined with Matlab software, the time-domain test data are used to analyze the variation characteristics of the time-domain noise under different operating conditions. Combined with LMS Test. Lab software, the time-domain data are transformed into frequency-domain date to analyze the characteristics of noise spectrum in order to recognize the noise components. Especially when the cookware is suspended, the spectral analysis of the heating noise confirms the characteristics of the electromagnetic noise further. The noise variation characteristics caused by water boiling at different time periods are analyzed by comparing the noise spectra at different time points. According to the calculation of the proportion of acoustical power, the contributions of various noise components are obtained. These provide scientific basis on effectively controlling noise of induction cooker.