论文部分内容阅读
本文介绍用软件FFT对几种家用电器的噪声进行频谱分析和相关分析,并着重分析了400mm电扇的噪声谱及其产生机理。本方法有助于降低产品噪声,改进产品质量。一、引言噪声是家用电器的重要性能指标之一。通常采用声功率级测量来检验产品,而研究噪声频谱则多用1倍频程或1/3倍频程的滤波器法。滤波器法的缺点是通带过渡域宽,分辨率低。近年来,随着计算机的广泛应用,数字信号处理(DSP)技术得到了迅速的发展,并已应用于大型机械的噪声分析。快速傅里叶变换(FFT)是DSP的一个主要方法。本文采
This article describes the use of software FFT on several household appliances noise spectrum analysis and correlation analysis, and focuses on the 400mm fan noise spectrum and its generation mechanism. This method helps reduce product noise and improve product quality. First, the introduction of noise is one of the important performance indicators of household appliances. Sound power level measurement is usually used to test the product, while the study of the noise spectrum is more use of 1 octave or 1/3 octave filter method. The disadvantage of the filter method is the wide passband transition and low resolution. In recent years, with the wide application of computers, digital signal processing (DSP) technology has been rapidly developed and has been applied to the noise analysis of large machines. Fast Fourier Transform (FFT) is a major method of DSP. This article adopted