噪声级在100～105dB(A)范围内时,如果操作持续一二小时以上,就可能使操作者患神经衰弱。美国矿山局已经找到了一种减少采煤机截齿滚筒噪声的方法。研究表明:噪声一般产生在低于500Hz 的低频范围截煤时,而采煤机截齿滚筒的标准螺旋线在这个低频范围容易产生共振。新设计的滚筒,由于在滚筒壁上嵌入一薄片弹性阻尼材料,因而对这样的低频率共振反应较迟 Noise levels in the range of 100 ~ 105dB (A), if the operation lasted an hour or more, it may make the operator suffering from neurasthenia. The U.S. Bureau of Mines has found a way to reduce the shearer’s drum noise. The research shows that noise generally occurs when cutting coal in the low frequency range below 500 Hz, while the standard helix of shearer’s pick roller is prone to resonate in this low frequency range. The newly designed roller, due to embedding a thin sheet of resilient damping material on the roller wall, is delayed for such low frequency resonance response