摘要
基于3D有限元法和隔声计算理论,将百叶窗叶片考虑成多孔吸声材料,建立开孔声屏障声学有限元隔声计算模型,并基于此模型分析泡沫铝材料属性对百叶窗声屏障隔声性能的影响。隔声计算模型通过现有理论与试验结果对比验证,理论验证不考虑泡沫铝材料,试验对比验证考虑泡沫铝材料。基于验证后的有限元隔声计算模型,调查泡沫铝材料流阻率和降噪系数对百叶窗声屏障隔声性能的影响。结果表明,声屏障计权隔声量与泡沫铝流阻率近似为线性关系,并且泡沫铝材料流阻率越小越好;声屏障计权隔声量与泡沫铝降噪系数呈指数关系,当降噪系数大于0.55时,进一步提高吸声材料的降噪系数对百叶窗声屏障隔声量影响较小。
A 3D finite element model（FEM） of a louver sound barrier for sound insulation analysis was established.This model was verified by comparing the computation output with the result of testing. Considering that the louver was made of foamed aluminum. The influences of the flow resistance and the noise reduction coefficient of the foamed aluminum on the sound insulation of the louver sound barrier were investigated. The results show that the weighted sound insulation and the aluminum foam flow resistance have a linear relationship approximately. And small flow resistance of the aluminum foam can yield good sound insulation effect. The weighted sound insulation and the noise reduction coefficient have an exponential relationship. When the noise reduction coefficient exceeds 0.55, further increasing of the noise reduction coefficient has small influence on the weighted sound insulation only.
出处
《噪声与振动控制》
CSCD
2015年第3期46-50,共5页
Noise and Vibration Control
基金
国家自然科学基金(U1434201)
国家863计划(2011AA11A103-4-2)
关键词
声学
声屏障
降噪系数
计算模型
流阻率
acoustics
sound barriers
noise reduction coefficient
calculation model
flow resistance
