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无穷大周期加筋微穿孔板结构振动响应及吸声特性
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Release Time:2019-03-10
Date:
2019-03-10
Indexed by:
Journal Article
Date of Publication:
2013-04-15
Journal:
计算力学学报
Included Journals:
Scopus、CSCD、ISTIC、PKU
Volume:
30
Issue:
2
Page Number:
204-211
ISSN:
1007-4708
Key Words:
振动响应;微穿孔板;空间波数;吸声;加强筋
Abstract:
研究在平面声波斜入射情况下,无穷大双周期加筋的微穿孔薄板结构的振动响应及吸声性能.首先在马大猷和Takahashi微穿孔板声学理论基础上,建立了微穿孔加筋薄板结构振动的半解析模型;然后应用傅里叶变换及空间波数分析方法,将周期加筋微穿孔薄板的振动位移及辐射声压表示为频域内波数的分量迭加形式;最后通过对波数分量进行求解,并利用傅里叶逆变换得到双周期加筋的微穿孔薄板的振动响应及吸声系数表达式.计算结果表明,薄板的弯曲振动在水中对吸声的影响较大,空气中仅对轻质穿孔板的低频吸声效果有一定影响;同时微穿孔率对周期加筋薄板吸声系数的影响明显,通过改变穿孔率和加筋周期等可有效地提高水中微穿孔薄板结构的吸声性能.
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双周期加筋微穿孔板的振动响应及声透射的研究