轻型木结构建筑减振降噪试验研究

为促进木结构建筑减振降噪研究,以一栋普通轻型木结构建筑和一栋葡萄牙软木优化轻型木结构建筑为研究对象,采用瞬态激励法和现场声压级法,分别测试两栋建筑的动力参数(频率、峰值加速度、阻尼比)和隔声量,并进行相关分析。结果表明:两种轻型木结构建筑均符合舒适度要求,同时软木优化轻型木结构建筑的平均阻尼比比普通轻型木结构建筑高1.6%;在关闭门窗,交通噪声源和扬声器噪声源共同作用情况下,软木优化结构建筑的平均隔声量比普通结构高4.6 dB(A);其中软木优化结构的减振降噪性能好于普通轻型木结构建筑,可以明显改善木结构建筑楼盖振动特性和隔声效果。上述以期为轻型木结构建筑的减振降噪优化设计工作提供技术支撑,具有工程应用价值。

Experimental Study on Vibration and Noise Reduction of Light Timber Buildings

In order to better promote the development of vibration and noise reduction of wood construction,in this study,an ordinary light timber building and a Portuguese cork optimized light timber building were compared as research objects.The dynamic parameters(natural frequency,acceleration peak,damping ratio)and sound insulation capacity of the two buildings were tested by transient excitation method and field sound pressure level method,and the correlation analysis was carried out.The results showed that the average damping ratio of softwood optimized light timber building is 1.6%higher than that of ordinary light timber building.With doors and windows closed,traffic noise sources and loudspeaker sources acting together,the average sound insulation capacity of cork optimized building is 4.6 dB(A)higher than that of ordinary building.Among them,the vibration and noise reduction performance of cork optimized structure is much better than that of ordinary structure,which can improve the ground vibration characteristics and sound insulation effect of timber building significantly.This study is expected to provide technical support for the optimal design of vibration and noise reduction of light timber buildings,which has the engineering application value.