突变截面穿孔板复合吸声结构的声学特性-《集美大学学报（自然科学版）》

文章信息/Info

Title:: Acoustic Characteristics of Compound Sound Absorption Structures of Perforated Plates with Abrupt Cross-Section

作者:: 李志勇1; 2; 陈必发1; 2; 于洪亮1; 2; 廖建彬1; 2; 邱泓钢1; (1.集美大学轮机工程学院，福建厦门361021；2.福建省海工装备检测与再制造产业技术创新研究院，福建厦门361021)

Author(s):: LI Zhiyong1; 2; CHEN Bifa1; 2; YU Hongliang1; 2; LIAO Jianbin1; 2; QIU Honggang1; (1.School of Marine Engineering,Jimei University,Xiamen 361021,China;2.Fujian Institute of Innovation for Marine Equipment Detection and Remanufacturing Industrial Technology,Xiamen 361021,China)

Keywords:: ship noise; abrupt cross-section perforated plate; melamine; composite sound absorption structure

摘要:: 针对船舶噪声吸声构件的不足，结合变截面穿孔板与多孔材料，提出由突变截面穿孔板、三聚氰胺多孔材料和空气分层串联组合的复合吸声结构。对所提出的吸声结构建立声学模型递推公式，进而推导吸声结构的吸声系数，通过阻抗管测试与有限元仿真验证了理论模型的正确性。通过对比不同结构的吸声系数表明，在突变截面穿孔板背腔填充多孔材料可使吸声结构获得更优的低频宽带吸声效果。同时开展不同吸声结构的声压与声能耗散密度仿真模拟，阐明吸声结构的吸声机制，并基于多吸声单元耦合设计方法，进一步优化设计八单元串并联吸声结构，实现了在800~1900 Hz和610~1900 Hz频段的连续准完美吸声。

Abstract:: In view of the shortage of marine noise absorbing components,a composite sound absorbing structure,which consists of an abrupt cross-section perforating plate,melamine perforating material and air layer in series was proposed by combining variable section perforating plate and porous material.The acoustic model recurrence formula was established for the proposed sound absorption structure,and then the sound absorption coefficient was derived.The correctness of the theoretical model was verified by impedance tube test and finite element simulation.By comparing the sound absorption coefficients of different structures,it was shown that filling the back cavity of the perforated plate with porous material could make the sound absorption structure obtain better low-frequency broadband sound absorption effect.The sound pressure and energy dissipation density of different sound absorption structures were simulated to clarify the sound absorption mechanism of the sound absorption structures.The eight-unit series and parallel sound absorption structure was further optimized based on the multi-element coupling design method,and the continuous quasi-perfect sound absorption in the frequency band of 800~1900 Hz and 610~1900 Hz was realized.