住宅抽油烟机的声音质量改进（英文）

Sound quality improvement of residential exhauster

在居家生活中,抽油烟机之噪声甚为扰人而影响生活质量。就现有某型常用抽油烟机,利用声级计量测其噪声量与频谱,并利用人工耳及dB sonic软件分别量测分析其声音质量参数值,所得结果在人耳位置之声级为68.1d B（A）,音质粗糙度为33.5 asper,响度为27.8 sone,波动强度为6.8 vacil,尖锐度为1.64 acum,并按王氏之烦躁度模式评估出烦躁度指针为13.19,其中以响度及尖锐度对音质评估之烦躁度指标影响最大。经机壳与机座之振动量测频谱与噪声频谱比较,鉴定出噪声主要峰值频率为500 Hz与100 Hz两个成分音,其中500Hz者为进气口之涡流噪声;而100 Hz者为机壳之振动辐射声。为降低排油烟机之响度及尖锐度以改善其运转时之声音质量,采用了几项对策。分别是：在进气口加装消声器,在机壳内侧贴吸声棉及包覆PU塑料膜,并黏贴阻尼材,所得效果可使噪声量降为55.2 d B（A）,振动量减1-5 d B,响度降为14.7 sone,尖锐度降为1.35 acum,烦躁度指标降为8.16。

In everyday life, the noise generated by exhauster in kitchens can be very annoying and therefore could affect life quality. In this article, the noise level spectrum and sound quality parameters for a specific exhauster are measured and analyzed by the sound level meter, the head/torso simulator and the software dB-sonic respectively. The results show that, at the position of human ears, the SPL is 68.1 dB（A）, the roughness is 33.5 asper, the loudness is 27.8 sone, the fluctuation intensity is 6.8 vacil, the sharpness is 1.64 acum and the annoyance index based on the Wang’s model of sound quality （SQ） assessment is 13.19, of which the sharpness and the loudness affects the SQ of the exhauster to the largest extent. By measuring vibrations on the exhauster casing and the motor seat, and comparing the vibrational spectra with that of the radiated vibroacoustic noise spectrum, it has been identified that the major peak components of the noise occur at the frequencies of 500Hz and 100Hz. The 500Hz sound component comes from the flow vortex at the intake, while the 100Hz sound component is induced by the casing vibrations. In order to improve the SQ of the ex-hauster, five countermeasures are adopted in this study to reduce both the sharpness and the loudness, namely：the in-stallation of a muffler at the intake end;the installation of some absorption glasswool on the inside surface of the casing and the coverage of the glasswool with a thin PU film;the adhesion of damping tape on the casing surface and ventila-tion pipewall;and the combination of the above four measures. As a result, the noise level is reduced to 55.2 dB（A）, the vibrations is reduced by1-5 dB, the loudness reduces to 14.7 sone, the sharpness reduces to 1.35 acum and the an-noyance index reduces to 8.16.