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通过多层轻质复合结构板材与自由层阻尼结构复合板材的隔声量对比,发现在整个噪声的频段内,尤其在低频区,多层轻质复合结构板材起到了比自由层阻尼结构复合板材更有效的降噪效果。多层轻质复合结构板材能达到既降低隔声层自重,又有效降噪的效果。
Through comparing the sound insulation quantity of multi-layer lightweight composite structure plate and free-layer damping structure composite plate, it is found that in the whole noise frequency band, especially in the low frequency region, the multi-layer lightweight composite structure plate plays a more important role than the free layer damping structure composite plate Effective noise reduction. Multi-layer lightweight composite structure can achieve the plate not only reduce the weight of the sound insulation layer, but also effective noise reduction effect.