矿用轴流通风机集流区域主动降噪试验

Experimental Study on Active Noise Control in Intake Area of Mine Axial Fan

针对轴流通风机进行主动降噪,尚属于轴流通风机降噪领域的前沿问题.围绕该问题,以YBT-5.5型轴流通风机为试验对象,选取自由空间、对称分布受限空间、近壁面受限空间作为通风机试验环境,分析通风机集流区域的噪声分布,并对比了降噪前后的声压级、频谱特性.结果表明,集流区域正对方向,在自由空间下,降噪量可达7.2 dB(A);受限空间下,空间对称分布时降噪量为5.9 dB(A),近壁面处降噪量为2.8 dB(A).在通风机集流区域,对于斜向45°的测点,左侧降噪难度高于右侧;相较两侧的测点,左侧降噪难度低于右侧.当通风机位置从自由空间变为受限空间时,集流区域的噪声能量变化集中在100~500 Hz.

The research is about active noise control of axial flow fans,which is a frontier issue in the field of noise reduction of axial flow fans.In order to study this problem,the YBT-5.5 axial flow fan is used as the experiment object.Free space,restricted space with symmetrical distribution,and restricted space near the wall are selected as the noise measurement environment of the fan.The noise distribution of the fan intake area is analyzed,and the sound pressure level and frequency spectrum characteristics before and after noise reduction are compared.The data show that in the opposite direction of the intake area,in free space,the noise reduction can reach 7.2 dB(A).In the confined space,the noise reduction is 5.9 dB(A)when the space is symmetrically distributed,and the noise reduction near the wall is 2.8 dB(A).For the measuring points with an oblique angle of 45°,the noise reduction difficulty on the left side is higher than that on the right side.For the measurement points on both sides,the noise reduction difficulty of the left side is lower than that of the right side.When the fan location changes from free space to confined space,the noise energy change in the intake area is concentrated in the range of 100~500 Hz.