二维周期阻尼薄板结构的隔声特性
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国家自然科学基金资助项目(50975289,51275531);中国博士后科学基金特别资助项目(201104514);湖南科技计划基金资助项目(2013GK3004)

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Sound Transmission Loss of Thin Plate with Twodimensional Periodically Bulkdamping
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    摘要:

    薄板结构中,传统大块敷设阻尼虽然能提高隔声量,但不利于轻量化设计,因此提出二维周期阻尼敷设方式,借助有限元法及VA one声学仿真软件,分析二维周期块状阻尼分布、形状等参数对薄板隔声特性的影响。结果表明,随着阻尼数目的增加,在16~125 Hz和250~1 000 Hz频段内,6块阻尼敷设方式隔声量最小;全频段范围内,x、y方向晶格常数均为100 mm时,隔声量最小。因此,在特定频段内,合理调整周期阻尼结构的晶格常数及阻尼数目能使隔声量达到最大;二维周期阻尼形状对隔声量有较大的影响,对于圆、正三角形及矩形三种特定的阻尼形状而言,圆形阻尼形状隔声效果最优。

    Abstract:

    The conventional big block damping can increase the sound transmission loss of thin plate,but goes against the light weight design.Thus a twodimensional periodically bulkdamping design is proposed in this paper.The influence of the bulkdamping parameters including distribution and shape on sound transmission loss are researched by FEM and VA one software.The results showed that the sound transmission loss was minimum with 6 damping blocks laid, at the frequency range of 16 to 125 Hz and 250 to 1 000 Hz with the increase of the number of damping blocks;while in the whole frequency band, the sound transmission loss reached the minimum when the lattice constant reached to 100 mm both in the x and y direction.So changing the lattice constant of the periodical damping structure and the damping number properly can maximize sound transmission loss in specific frequency bands. Different shapes of bulkdamping greatly influence the sound transmission loss.As for the damping shape of circle,equilateral triangle and rectangle, the circular bulkdamping possesses the best sound transmission loss.

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肖友刚,陈江.二维周期阻尼薄板结构的隔声特性[J].压电与声光,2016,38(1):84-87. XIAO Yougang, CHEN Jiang. Sound Transmission Loss of Thin Plate with Twodimensional Periodically Bulkdamping[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2016-02-25
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